Re: [Elecraft] KX3 to Non-Elecraft Linear Amp

[Don Wilhelm]

Dan,

That looks like it should work fine.

73,
Don W3FPR

On 4/2/2019 11:50 AM, Dan Smith wrote:


Thank you, Don.

I think I have the Elecraft cable for the Keyline output/ACC2 as it 
came with the cable pack that I purchased.


>From this lead, I would connect the RCA to the RCA amp port on the 
ARB 704 interface as the buffer step between the transceiver and the 
amplifier as is the case with my base station, correct?


Can you confirm that this will isolate the KX3 from the amp and not 
cause any damage to either? Under normal/best case circumstances.


Does this look right?
Image


Image


Thank you so much for your help with this.

73,

Dan
N7DSX




From: Don Wilhelm
Sent: Tuesday, April 2, 7:45 AM
Subject: Re: [Elecraft] KX3 to Non-Elecraft Linear Amp
To: Dan Smith, elecraft@mailman.qth.net


Dan, The KX3 has a KEYINE OUT output which will key your amplifier. It 
is on the ring contact of the ACC 2.5mm jack. See page 5 of the KX3 
manual. When you add the KXPA100, there is a "black box" on the KX3 to 
KXPA100 cable set which brings that KEYLINE signal out to an RCA jack. 
See the KXPA100 manual. So if you have only the KX3 now, you will have 
to build a cable which takes the ring contact of a 2.5mm stereo plug 
out to an RCA plug which you would connect to your amplifier. The KX3 
KEYLINE output is rated to accept up to 30 volts and up to 100ma. 73, 
Don W3FPR On 4/2/2019 10:04 AM, Dan Smith wrote: > I am looking to see 
if anyone else has used an Ameritron AL811 with their > KX3 with 
positive results. > > I plan on buying the KXPA100, but after buying 
the Shack in a Bag, I will > need to put it off for a little bit. In 
the mean time, I would like to try > using what I have, but I am 
hesitant to try since the KX3 is new to me and > I don't want to harm 
anything. > > I have a base station radio that plugs into the 
Ameritron AL811 by way of > the ARB-704 and it works great with 70 
watts going it to make 600 watts > going out. The ARB amp line is a 
simple RCA jack from the ARB 704 to the > rear of the Amp, but the 
radio cord is the Multi cord plugged into my base > station. I know I 
can unplug the multi cord and use the RCA jack on the > back of the 
ARB 704 "radio" input, but I am not sure where that will plug > into. 
> > I know that I can only push 15 watts max into the Ameritron, but 
wouldn't > that mean that I could get somewhere around 180 watts out 
of it? Would it > work like that? > > I bought the cable pack from 
Elecraft, so I am pretty sure I have > everything that I need to make 
it happen, but I would love the advice of > someone on here that may 
have already done this, or has good information on > why I should not 
try this. I could also use help in which plugs to plug > where. > > 
Thank you for any information that anybody may be able to give and 
please > forgive me if this has been posted somewhere already. I have 
done my best > to search for several days online and in this forum, 
but I am not coming up > with any answers. > > 73, > > Dan > N7DSX > 
__ > 
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Re: [Elecraft] KX3 to Non-Elecraft Linear Amp

[Don Wilhelm]

Dan,

The KX3 has a KEYINE OUT output which will key your amplifier.  It is on 
the ring contact of the ACC 2.5mm jack.  See page 5 of the KX3 manual.


When you add the KXPA100, there is a "black box" on the KX3 to KXPA100 
cable set which brings that KEYLINE signal out to an RCA jack.  See the 
KXPA100 manual.


So if you have only the KX3 now, you will have to build a cable which 
takes the ring contact of a 2.5mm stereo plug out to an RCA plug which 
you would connect to your amplifier.


The KX3 KEYLINE output is rated to accept up to 30 volts and up to 100ma.

73,
Don W3FPR

On 4/2/2019 10:04 AM, Dan Smith wrote:

I am looking to see if anyone else has used an Ameritron AL811 with their
KX3 with positive results.

I plan on buying the KXPA100, but after buying the Shack in a Bag, I will
need to put it off for a little bit. In the mean time, I would like to try
using what I have, but I am hesitant to try since the KX3 is new to me and
I don't want to harm anything.

I have a base station radio that plugs into the Ameritron AL811 by way of
the ARB-704 and it works great with 70 watts going it to make 600 watts
going out. The ARB amp line is a simple RCA jack from the ARB 704 to the
rear of the Amp, but the radio cord is the Multi cord plugged into my base
station. I know I can unplug the multi cord and use the RCA jack on the
back of the ARB 704 "radio" input, but I am not sure where that will plug
into.

I know that I can only push 15 watts max into the Ameritron, but wouldn't
that mean that I could get somewhere around 180 watts out of it? Would it
work like that?

I bought the cable pack from Elecraft, so I am pretty sure I have
everything that I need to make it happen, but I would love the advice of
someone on here that may have already done this, or has good information on
why I should not try this. I could also use help in which plugs to plug
where.

Thank you for any information that anybody may be able to give and please
forgive me if this has been posted somewhere already. I have done my best
to search for several days online and in this forum, but I am not coming up
with any answers.

73,

Dan
N7DSX
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[Elecraft] KX3 to Non-Elecraft Linear Amp

[Dan Smith]

I am looking to see if anyone else has used an Ameritron AL811 with their
KX3 with positive results.

I plan on buying the KXPA100, but after buying the Shack in a Bag, I will
need to put it off for a little bit. In the mean time, I would like to try
using what I have, but I am hesitant to try since the KX3 is new to me and
I don't want to harm anything.

I have a base station radio that plugs into the Ameritron AL811 by way of
the ARB-704 and it works great with 70 watts going it to make 600 watts
going out. The ARB amp line is a simple RCA jack from the ARB 704 to the
rear of the Amp, but the radio cord is the Multi cord plugged into my base
station. I know I can unplug the multi cord and use the RCA jack on the
back of the ARB 704 "radio" input, but I am not sure where that will plug
into.

I know that I can only push 15 watts max into the Ameritron, but wouldn't
that mean that I could get somewhere around 180 watts out of it? Would it
work like that?

I bought the cable pack from Elecraft, so I am pretty sure I have
everything that I need to make it happen, but I would love the advice of
someone on here that may have already done this, or has good information on
why I should not try this. I could also use help in which plugs to plug
where.

Thank you for any information that anybody may be able to give and please
forgive me if this has been posted somewhere already. I have done my best
to search for several days online and in this forum, but I am not coming up
with any answers.

73,

Dan
N7DSX
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Re: [Elecraft] Linear thoughts

[Erik Basilier]

Perhaps a new, legal limit power amplifier should be non-linear so as to
achieve very high efficiency. Broadcasters seem to use such designs
routinely, and the latest QEX described a ham version under development.


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Re: [Elecraft] Linear thoughts

[John Marvin]

I want to echo that a KPA-1500 be the same as the KPA500 in terms of 
ease of use and interface, solid state, QSK switching, etc.


Some of my points:

Some have said "at least 1000W". In my opinion, that is not a big enough 
step above the KPA500, but some will make the case that 1500 isn't 
either, but at least it is the max allowed. If you're going to sell an 
amp above the KPA500 make it full legal limit.


Leverage what you can from the KPA500, but at the same point, the KPA500 
design is getting a little old. A lot has happened in high power solid 
state RF electronics since then. I would prefer that the amp be based on 
LDMOS RF Power transistors. Perhaps the MRF1K50HR5 from NXP 
Semiconductors should be considered. LDMOS is known for great linearity 
and the latest devices are pretty rugged.


If you do invest in a newer design, consider some backwards leverage 
from the KPA1500 (if that is what you call it) to the KPA500, i.e. an 
updated KPA500 V2 that leverages some of the new design and perhaps 
makes supporting the two amps easier.


I may never buy a KPA1500, but I once said that I would never want more 
than 100W when I bought the KXPA100, but now I own a KPA500/KAT500!


73,
John
AC0ZG

On 3/24/2017 4:11 AM, Arie Kleingeld PA3A wrote:

Besides the usual things nearly every other hi-end linear has:
- tuner built-in as an option
- really light weight
- at least 90% efficiency
- one, max 2 antenna ports

(these fit into the portable rig philosophy of Elecraft)

73
Arie PA3A
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Re: [Elecraft] Linear thoughts

[Arie Kleingeld PA3A]

Besides the usual things nearly every other hi-end linear has:
- tuner built-in as an option
- really light weight
- at least 90% efficiency
- one, max 2 antenna ports

(these fit into the portable rig philosophy of Elecraft)

73
Arie PA3A
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Re: [Elecraft] Linear thoughts

[W0MU Mike Fatchett]

I think the FCC is going to change the rules on the gain factor, 
hopefully soon.


1500w out on RTTY with zero limitations on duty cycle or very little 
limitation.


Very quiet cooling.

6m would be nice but probably an issue at that power.

Price is probably the biggest what if.

No tune obviously.

Built in tuner.  If you can make the amp like 3:1 SWR's great then no 
tuner.


I would love to be able to share the amp with my 2nd K3.  SO2R or 
similar type operations.


I would be ok with a separate power supply separate from the amp part to 
keep the size as small as possible.


Fully remote controllable with USB/Ethernet including an on off function 
or reset.


W0MU




On 3/23/2017 11:46 PM, Matthew Cook wrote:

Eric,

That's easy, #1 requirement should be spectral purity at full smoke.  So
simply take the features and functions of the KPA500 and increase output to
1500W PEP.   I'd not like to see Elecraft waste their time with an
Spurious/IMD spec that only just pass the FCC requirements, it's about time
someone showed leadership here.   At the very least I'd expect to see
Spurious emissions 60dB (or more) below PEP and IMD 30dB (or more) below
PEP across all bands, I'll admit this is not easy to do from 1.8-50MHz but
it's also not impossible.  This is the minimum commercial spec for 1kW HF
gear here in VK already, for inspiration Codan 3062 or LINEARamp Gemini.
However it's not easy especially since the FCC ties your hands behind your
backs in terms of gain from the get go.

The nice to haves (wish list) would be;

- Four antenna output with an internal tuner that could flatten antennas
that creep up towards 3:1 at the band edges (ala alpha 9500 series)
- Limit the weight of the KPA1500 to the same as the KPA500 is now
(preferably lighter) so switchmode PSU's this time please.
- Make allowances for those countries that aren't limited to FCC 13dB
gain, we'd be happy with just 16dB (*30-40W grin*) and let us pocket the
IMD/Spurious improvements

If Elecraft were to make such an amp with this sort of spectral purity I'd
be inclined to complete the necessary paperwork for a high power variation
on my license here in VK and purchase an amp.  I've toyed with the Gemini
Amp a couple of times but the integration of the KPA500 eventually tipped
the balance.

Then all we've got to do is get more people pointing their beams at us
during DXpeditions and Contests and we'd be set.

73

Matthew
VK5ZM

On 18 March 2017 at 03:36, Eric Swartz - WA6HHQ, Elecraft 

Re: [Elecraft] Linear thoughts

[Matthew Cook]

Eric,

That's easy, #1 requirement should be spectral purity at full smoke.  So
simply take the features and functions of the KPA500 and increase output to
1500W PEP.   I'd not like to see Elecraft waste their time with an
Spurious/IMD spec that only just pass the FCC requirements, it's about time
someone showed leadership here.   At the very least I'd expect to see
Spurious emissions 60dB (or more) below PEP and IMD 30dB (or more) below
PEP across all bands, I'll admit this is not easy to do from 1.8-50MHz but
it's also not impossible.  This is the minimum commercial spec for 1kW HF
gear here in VK already, for inspiration Codan 3062 or LINEARamp Gemini.
However it's not easy especially since the FCC ties your hands behind your
backs in terms of gain from the get go.

The nice to haves (wish list) would be;

   - Four antenna output with an internal tuner that could flatten antennas
   that creep up towards 3:1 at the band edges (ala alpha 9500 series)
   - Limit the weight of the KPA1500 to the same as the KPA500 is now
   (preferably lighter) so switchmode PSU's this time please.
   - Make allowances for those countries that aren't limited to FCC 13dB
   gain, we'd be happy with just 16dB (*30-40W grin*) and let us pocket the
   IMD/Spurious improvements

If Elecraft were to make such an amp with this sort of spectral purity I'd
be inclined to complete the necessary paperwork for a high power variation
on my license here in VK and purchase an amp.  I've toyed with the Gemini
Amp a couple of times but the integration of the KPA500 eventually tipped
the balance.

Then all we've got to do is get more people pointing their beams at us
during DXpeditions and Contests and we'd be set.

73

Matthew
VK5ZM

On 18 March 2017 at 03:36, Eric Swartz - WA6HHQ, Elecraft  wrote:

> Interesting discussion.
>
> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500
> in operation, what features etc would be important?
>
> 73,
> Eric
> /elecraft.com/
>
>
>
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Re: [Elecraft] [Elecraft) Linear thoughts

[Ken K6MR]

Not at all. My KPA500s/KAT500s are in the closet. Heat, noise, clutter all away 
from the desk.  The remote programs sit unobtrusively on the screen for 
monitoring.  The amps/tuners follow the radios automagically.

I can concentrate on making Qs.

Ken K6MR

From: James Wilson<mailto:w4rk...@gmail.com>
Sent: Tuesday, March 21, 2017 10:45 AM
To: Elecraft<mailto:elecraft@mailman.qth.net>
Subject: [Elecraft] [Elecraft) Linear thoughts

Christopher,

Kinda takes the fun out of "operating".
 Jim - W4RKS
-

>+1.   Wish I never had to touch the buttons or look at the displays on my
KPA500 or KAT500 ever.




>On Sun, Mar 19, 2017 at 1:49 AM, Erik Basilier <http://mailman.qth.net/mailman/listinfo/elecraft>> wrote:

>* Now I have the KPA500 and KAT500 actually up and running for the first
*>* time.
*>* I am very happy with my purchase, and the combo is better integrated than
*>* anything else I have used.
*>* By integrated, I mean the boxes work together well.
*>* The fact that they are separate boxes, that I could purchase at different
*>* times, is a big plus for me.*
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[Elecraft] Linear thoughts

[James Wilson]

Christopher,

Kinda takes the fun out of "operating".
 Jim - W4RKS
-

> "+1. Wish I never had to touch the buttons or look at the displays on my
KPA500 or KAT500 ever."

-

>On Sun, Mar 19, 2017 at 1:49 AM, Erik Basilier > wrote:

>* Now I have the KPA500 and KAT500 actually up and running for the first
*>* time.
*>* I am very happy with my purchase, and the combo is better integrated than
*>* anything else I have used.
*>* By integrated, I mean the boxes work together well.
*>* The fact that they are separate boxes, that I could purchase at different
*>* times, is a big plus for me.*
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[Elecraft] [Elecraft) Linear thoughts

[James Wilson]

Christopher,

Kinda takes the fun out of "operating".
 Jim - W4RKS
-

>+1.   Wish I never had to touch the buttons or look at the displays on my
KPA500 or KAT500 ever.




>On Sun, Mar 19, 2017 at 1:49 AM, Erik Basilier > wrote:

>* Now I have the KPA500 and KAT500 actually up and running for the first
*>* time.
*>* I am very happy with my purchase, and the combo is better integrated than
*>* anything else I have used.
*>* By integrated, I mean the boxes work together well.
*>* The fact that they are separate boxes, that I could purchase at different
*>* times, is a big plus for me.*
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Re: [Elecraft] Linear thoughts

[Christopher Hoover]

+1.   Wish I never had to touch the buttons or look at the displays on my
KPA500 or KAT500 ever.




On Sun, Mar 19, 2017 at 1:49 AM, Erik Basilier  wrote:

> Now I have the KPA500 and KAT500 actually up and running for the first
> time.
> I am very happy with my purchase, and the combo is better integrated than
> anything else I have used.
> By integrated, I mean the boxes work together well.
> The fact that they are separate boxes, that I could purchase at different
> times, is a big plus for me.
> However, I have to disagree with those that have said that it all works
> like
> having a 500W transceiver.
> Examples:
> * Antenna selection now has to be done from the KAT500. I can't do it by
> the
> ANT button on the K3, so the labels on the antennas defined there are now
> useless.
> * The Power readout is now on the amp, and the Power knob on the K3 just
> shows the drive power. It is certainly valuable to be able to read the
> drive
> power, but in a 500W transceiver that would be a separate readout, and the
> Power adjustment readout would show the final output power.
> Again, I am happy, and all is good.
> But a future Electraft architecture that is to overshadow the competition
> would use a more global approach to settings that reflect the whole system
> rather than settings per box, and to achieve this the actual settings in a
> box (e.g. antenna selection in the tuner) would be controlled through a
> network rather than local panel controls. The controls would all originate
> from a controller (or multiple controllers in case of multiple operators
> operating independently), which could be dedicated devices a la Maestro, or
> PC's (for cheap users), or hardware transceivers such as the K3. Of course,
> the K3 would have to get firmware updates that would include more ANT
> choices, drive power display mode, selection of classic operation mode
> versus global controller mode, etc.
>
> 73,
> Erik K7TV
>
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Re: [Elecraft] Linear thoughts

[David Mackey]

Getting back to Eric's original question, I suggest that the main appeal of the 
KPA500 is its easy interoperability with the Elecraft product line, and that 
this should be the baseline feature for a new high powered amp. Yes the KPA500 
can be used very easily with other transceivers, but it's probably best with 
Elecraft transceivers. "Like having a 500 watt transceiver" or 1500 w going 
forward. I have used the KPA500 with a TS590S on a trip to V4 and it is very 
nice, but not with all the ease of use I would have had with a K3.

So far as overall architecture i.e. separate power supply, etc, I think this 
depends on the nature of other future companion products for such an amp.  
Those of us outside Elecraft have not seen these yet, so our speculations are 
only in the context of existing products. Many of these decisions are probably 
already made by those at Elecraft with this knowledge. 

I suggest that Elecraft has a history of introducing products which do not 
obsolete their existing products, but rather expand their line into new niches 
of the market. It is reasonable to assume that they will continue to do this. 
Based on this assumption, while the K3/KPA500 products are nice on the 
operating desk at home, they are also easily transported (ideal for 
DXpeditions), a new line of K products might be a bit larger with primary focus 
on the operating desk and more advanced built-in displays. With the existing K3 
line in place they would not necessarily need to be very portable. A companion 
higher power linear might have a bit more room inside for larger PS and/or auto 
tuner. 

Looking at an autotuner vs. built-in PS, I currently operate a K3S with an SPE 
1.3K-FA amp. It comes close to the high power transceiver concept, except due 
to the unique ALC Elecraft approach, I can't rely on the usual SPE's ability to 
use the ALC to throttle back transceiver drive levels. Its easy to set drive 
levels manually with K3 so no big problem. I just have to remember to do it. It 
would be nice to have this capability just like the KPA500 provides. The SPE is 
a nice small amp not much larger than a KPA500 and includes an antenna tuner 
and PS. However, like most built-in tuners, it gives up some capability. It 
does not like to deal with mis-matches over about 4:1. Considering that this is 
at about the 1500w level, this limit is understandable in the size of the amp. 
I try to keep my antenna SWRs within this constraint. I also have the autotune 
option in my K3S which, unlike most built-in tuners, deals nicely with SWRs of 
up to 10:1, but of course at the 100w level. G
 iven the choice of a built-in high power autotuner able to deal with SWRs in 
say the 6 or 7:1 range vs built-in PS, I would remote the PS. If a 10:1 tuner 
was offered but in a larger package, I would remote everything except a control 
head for the amp and tuner. Not a long distance maybe of to 10 ft. 

Having a separate KAT1500 auto tuner in the line is another possibility, but it 
would have to have some features over the Palstar  HF- Auto or Kessler AT- Auto.

73, Dave, K1KA


David Mackey
k...@comcast.net
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Re: [Elecraft] Linear thoughts

[Erik Basilier]

Now I have the KPA500 and KAT500 actually up and running for the first time.
I am very happy with my purchase, and the combo is better integrated than
anything else I have used. 
By integrated, I mean the boxes work together well.
The fact that they are separate boxes, that I could purchase at different
times, is a big plus for me.
However, I have to disagree with those that have said that it all works like
having a 500W transceiver.
Examples:
* Antenna selection now has to be done from the KAT500. I can't do it by the
ANT button on the K3, so the labels on the antennas defined there are now
useless.
* The Power readout is now on the amp, and the Power knob on the K3 just
shows the drive power. It is certainly valuable to be able to read the drive
power, but in a 500W transceiver that would be a separate readout, and the
Power adjustment readout would show the final output power.
Again, I am happy, and all is good.
But a future Electraft architecture that is to overshadow the competition
would use a more global approach to settings that reflect the whole system
rather than settings per box, and to achieve this the actual settings in a
box (e.g. antenna selection in the tuner) would be controlled through a
network rather than local panel controls. The controls would all originate
from a controller (or multiple controllers in case of multiple operators
operating independently), which could be dedicated devices a la Maestro, or
PC's (for cheap users), or hardware transceivers such as the K3. Of course,
the K3 would have to get firmware updates that would include more ANT
choices, drive power display mode, selection of classic operation mode
versus global controller mode, etc.

73,
Erik K7TV

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Re: [Elecraft] Linear thoughts

[Edward R Cole]

George,

My Harris Platinum-1 (ch. 2 TV) linear runs 1000w output for 11w 
drive which is 19.6 dB gain.  But this is on 6m which I do not 
believe is restricted to 15-dB gain by the FCC.  My understanding 
that this rule just affected HF amplifiers.  In any case it is 
legally built under FCC rules for television and is modified for use 
by hams on 6m or higher bands.  There is no rule restricting you 
building a ham amplifier with more than 15-dB (only applies to 
manufacturers who sell to the public).


In fact, I can build such an amplifier and sell it legally to another 
ham, as long as I am not a business doing  multiple sales per year.


I built several linear amps for 2m that produced 80w output with as 
little drive as 50mw.  They are biased to draw 8A quiescent current 
(about 15A at 80w  output), so  this is near to class-A.  I have some 
50w linear amps for 3400-MHz that draw full current without drive 
(obviously class-A) and you do not want to key them long-term in Tx 
or you risk over heating them. They drive with 5mw.


Ed - KL7UW

---
I believe my Harris analog TV PAs were in the 20 db gain region - apx 10
watts in for a kilowatt out. I believe the digital PAs were lower gain to
run as class A (or very close to class A).

>From the analog exciter output to IPA to PA to low-pass/filterplexer output

it was from 250 mw to 30 kw. That would be over 50 db gain! And that system
was type accepted.

73
George - AI4VZ


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] Linear thoughts

[K9MA]

I don't know how to do it with ONE press of a switch, but there is a 
cheaper way to change bands on the K3/K3S with two.


73,

Scott  K9MA

On 3/18/2017 22:00, Wes Stewart wrote:

I just bought one to use as a bandswitch:-)

On 3/18/2017 12:04 PM, Ron D'Eau Claire wrote:

Hitting the band switch on the KPA500 is a quick way to avoid cycling
through the bands sequentially on the K3.

73, Ron AC7AC





--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] Linear thoughts

[Wes Stewart]

I just bought one to use as a bandswitch:-)

On 3/18/2017 12:04 PM, Ron D'Eau Claire wrote:

Hitting the band switch on the KPA500 is a quick way to avoid cycling
through the bands sequentially on the K3.

73, Ron AC7AC


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Re: [Elecraft] Linear thoughts

[Bill Johnson]

Apparently not but your suggestion led us to infected sites. Thank you for 
proper URL! It works!
Bill
K9YEQ

From: Ken K6MR [mailto:k...@outlook.com]
Sent: Saturday, March 18, 2017 7:40 PM
To: Bill Johnson <k9...@live.com>; KV5J <nela...@yahoo.com>; KV5J via Elecraft 
<elecraft@mailman.qth.net>
Subject: RE: [Elecraft] Linear thoughts

Are you going to nx1p.net?  I don't see anything unusual here.

Ken K6MR

From: Bill Johnson<mailto:k9...@live.com>
Sent: Saturday, March 18, 2017 5:05 PM
To: KV5J<mailto:nela...@yahoo.com>; KV5J via 
Elecraft<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Linear thoughts

The website appears infected based on our experiences

Have a great day!
Bill J



From: Elecraft 
<elecraft-boun...@mailman.qth.net<mailto:elecraft-boun...@mailman.qth.net>> on 
behalf of KV5J via Elecraft 
<elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>>
Sent: Saturday, March 18, 2017 6:55:24 PM
To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Linear thoughts

I signed up on NX1P web site and tried to log in and a pop up said I was
black listed while logging in.
I think I'll stay way also.

Keith



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Re: [Elecraft] Linear thoughts

[Gmail - George]

Her website.
Her copywrited paper is also available at:
http://www.oz6hq.dk/userfiles/downloads/kpa500%20mods.pdf
Shows details about her modification to add 2.5 db gain by eliminating the 
input attenuator and modifying the sensor circuit to keep the protection 
circuit - protecting.

Elecraft disavows modifying the KPA500 for stability and FCC rules violation 
by the manufacture reasons, at least while the silly 15 db rule is in 
effect.

Hopefully the FCC will get around to the elimination of the 15 db rule in 
the present NPR.

I believe my Harris analog TV PAs were in the 20 db gain region - apx 10 
watts in for a kilowatt out. I believe the digital PAs were lower gain to 
run as class A (or very close to class A).
>From the analog exciter output to IPA to PA to low-pass/filterplexer output 
it was from 250 mw to 30 kw. That would be over 50 db gain! And that system 
was type accepted.

73
George - AI4VZ


-Original Message- 
From: Bill Johnson

I went to his "website" and wound up downloading the famous, "your PC is 
infected, call Microsoft immediately"  message.  I did a hard shut down 
without clicking on any thing on the desktop, not infected. So be careful 
with this suggestion.

73,
Bill
K9YEQ

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Re: [Elecraft] Linear thoughts

[Ken K6MR]

Are you going to nx1p.net?  I don’t see anything unusual here.

Ken K6MR

From: Bill Johnson<mailto:k9...@live.com>
Sent: Saturday, March 18, 2017 5:05 PM
To: KV5J<mailto:nela...@yahoo.com>; KV5J via 
Elecraft<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Linear thoughts

The website appears infected based on our experiences

Have a great day!
Bill J



From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of KV5J via 
Elecraft <elecraft@mailman.qth.net>
Sent: Saturday, March 18, 2017 6:55:24 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

I signed up on NX1P web site and tried to log in and a pop up said I was
black listed while logging in.
I think I'll stay way also.

Keith



--
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Re: [Elecraft] Linear thoughts

[Bill Johnson]

The website appears infected based on our experiences

Have a great day!
Bill J



From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of KV5J via 
Elecraft <elecraft@mailman.qth.net>
Sent: Saturday, March 18, 2017 6:55:24 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

I signed up on NX1P web site and tried to log in and a pop up said I was
black listed while logging in.
I think I'll stay way also.

Keith



--
View this message in context: 
http://elecraft.365791.n2.nabble.com/Linear-thoughts-tp7628069p7628254.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] Linear thoughts

[KV5J via Elecraft]

I signed up on NX1P web site and tried to log in and a pop up said I was
black listed while logging in.
I think I'll stay way also.

Keith



--
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Re: [Elecraft] Linear thoughts

[Bill Johnson]

I went to his "website" and wound up downloading the famous, "your PC is 
infected, call Microsoft immediately"  message.  I did a hard shut down without 
clicking on any thing on the desktop, not infected. So be careful with this 
suggestion.

73,
Bill
K9YEQ

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ken K6MR
Sent: Saturday, March 18, 2017 2:09 PM
To: Dan Baker <km...@km6cq.com>; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Check out the web page of NX1P. Reasonably simple mods to add a few dB of gain 
to the KPA500 and allows full power with KX3 drive.  I modified both my KPAs 
because I do run them in parallel and needed a bit more gain on the higher 
bands.

Ken K6MR

From: Dan Baker<mailto:km...@km6cq.com>
Sent: Saturday, March 18, 2017 9:32 AM
To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Linear thoughts

It would be very nice to have the ability to make a unauthorized, unofficial 
simple mod. Maybe call it the KX3 mod. This mod would allow one to drive the 
amp to full output with a KX2 or KX3.

Dan KM6CQ
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Re: [Elecraft] Linear thoughts

[Doug Person]

I'm totally with these suggestions.  A separate power supply that can be 
positioned away from the operating desk would be, IMO, very desirable.  
An internal tuner option sounds nice.  But may be difficult as the 
components for 1500 watts get kind of big.  I think it would be very 
desirable, but may not be practical unless we are willing to accept a 
larger box.


There have been an awful lot of great suggestions.  Most important to me 
are: 2 inputs, 4 outputs.  Inputs are RF sensing. No switch selecting 
needed to transmit from transceiver A or B. Remembers band, output 
level, and antenna selection for each input.


I think a weather proof tuner is a whole other issue.  One I would like 
to see.



Doug -- K0DXV

On 3/17/2017 6:20 PM, Gary K9GS wrote:

A lot of great suggestions but two I have not seen discussed:

1)  I really like the idea of a separate power supply simply because 
if the amp has to ever go in for service or be shipped it is a lot 
easier without a heavy power supply inside the cabinet. Just send the 
RF deck to Elecraft.


2)  I like the idea of an optional INTERNAL tuner.  Makes it nice and 
clean for those that need a tuner without a rats nest of Y cables, 
etc.  If there is going to be an external tuner make it weatherproof 
so you can put it OUTSIDE.


I would love a 1.5K+ amp with a K3 type legal limit tuner I can put 
outside.




On 3/17/2017 6:59 PM, Fred Jensen wrote:
The "KPA1500" should look, feel, and behave like a KPA500.  OK, it 
can weigh a little more but should be liftable by your average age 
ham [oldish].  If you want to sell it widely, the "KAT1500" will also 
be needed since there are a whole bunch of folks who have less than 
monoband stacks on all bands, but it needs to be either an internal 
or external option, some won't need it.


Fans should make no noise whatsoever, even on high speed.  Rated for 
100% duty cycle to accommodate RTTY, JT65, and 75 meter AM looong 
transmissions.  It shouldn't cost more than 3 times a KPA500, same 
$/watt.  It should accept higher VSWR's than the KPA500, say maybe 
3:1?  A plus would be operation on a 20A 120V circuit and/or a 
sagging generator.  Needless to say, full perfect QSK at 110 WPM, 
zero IMD, and be able to eliminate TX phase noise if used with some 
notable non-Elecraft transmitters.  An LCD display for a trapezoid 
pattern to assure linearity would be a plus but not essential since 
it's going to be perfectly linear anyway.


Very tough market to enter, and potential customers can be so very 
fickle.


73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn

PS:  Before blood pressures rise, paragraph 2 is a feeble [very] 
attempt at some humor based on passages on this list.  A deep breath 
or two would be best.  I believe paragraph 3 is true however, and I 
really want to see Elecraft stay in business.



On Fri,3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:
Folks, if we did introduce a 1500 W solid state amp similar to our 
KPA500 in operation, what features etc would be important?




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Re: [Elecraft] Linear thoughts

[Bill]

The only controls I ever touch on the KPA500 are the ON and the oper/stby.

--
Many of life's problems can be solved by simply deciding what
we can do without. - John Dolan

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Re: [Elecraft] Linear thoughts

[Doug Person]

In every way exactly like the KPA500 but 1500 out - full key-down.

Doug -- K0DXV


On 3/17/2017 11:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our 
KPA500 in operation, what features etc would be important?


73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[john]

Brilliant! I have not contested with the amp so I never thought of that.
The K3S band change is sort of a pain.  While at WP2AA earlier this month I
somehow wound up on 5MHz and it's not one of my programmed contest bands. I
have also accidently switched bands while trying to turn the VOX on and off.

John KK9A


-Original Message-
From: Ron D'Eau Claire [mailto:r...@cobi.biz] 
Sent: Saturday, March 18, 2017 3:04 PM
To: j...@kk9a.com; elecraft@mailman.qth.net
Subject: RE: [Elecraft] Linear thoughts

Hitting the band switch on the KPA500 is a quick way to avoid cycling
through the bands sequentially on the K3. 

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
j...@kk9a.com
Sent: Saturday, March 18, 2017 11:49 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Linear thoughts

What buttons are you using besides ON and maybe OPER/STBY?

John KK9A


From: Ed Muns ed at w0yk.com
Sat Mar 18 14:25:12 EDT 2017

Based on the excellent KPA500 design, augmented by user experience, and the
added comments to Eric's question below, I'm confident Elecraft can define
another great product if they so choose.

My request is that the button colors be more functional than they are on the
KPA500.  "Black on Black" is aesthetically very cool in a well-lit
environment, but functionally very poor in most actual operational
environments.  Some of us have replaced the KPA500 button caps with gray and
other colors like on the K3, so we can find the buttons more readily.

Ed W0YK


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Re: [Elecraft] Linear thoughts

[Ed Muns]

All of them.  It's not a question of assigning a "value" to each button to
determine which is more important to be visible.  Those choices will vary
with user anyway.  Some users like the band buttons on the KPA500 to change
bands on their K-Line.

When operating, I can distract myself from DXing or contesting for a few
seconds to stare at the front panel of the KPA500 and find the button I'm
looking for.  I'd rather be able to spot the desired button out of the
corner of my eye without losing operation focus.  Contrasting button colors
support that use case.

Ed W0YK
__

John KK9A asked:

What buttons are you using besides ON and maybe OPER/STBY?

John KK9A


From: Ed Muns ed at w0yk.com 
Sat Mar 18 14:25:12 EDT 2017

Based on the excellent KPA500 design, augmented by user experience, and the
added comments to Eric's question below, I'm confident Elecraft can define
another great product if they so choose.

My request is that the button colors be more functional than they are on the
KPA500.  "Black on Black" is aesthetically very cool in a well-lit
environment, but functionally very poor in most actual operational
environments.  Some of us have replaced the KPA500 button caps with gray and
other colors like on the K3, so we can find the buttons more readily.

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Re: [Elecraft] Linear thoughts

[Ken K6MR]

Check out the web page of NX1P. Reasonably simple mods to add a few dB of gain 
to the KPA500 and allows full power with KX3 drive.  I modified both my KPAs 
because I do run them in parallel and needed a bit more gain on the higher 
bands.

Ken K6MR

From: Dan Baker<mailto:km...@km6cq.com>
Sent: Saturday, March 18, 2017 9:32 AM
To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Linear thoughts

It would be very nice to have the ability to make a unauthorized,
unofficial simple mod. Maybe call it the KX3 mod. This mod would allow one
to drive the amp to full output with a KX2 or KX3.

Dan KM6CQ
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Re: [Elecraft] Linear thoughts

[Ron D'Eau Claire]

Hitting the band switch on the KPA500 is a quick way to avoid cycling
through the bands sequentially on the K3. 

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
j...@kk9a.com
Sent: Saturday, March 18, 2017 11:49 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Linear thoughts

What buttons are you using besides ON and maybe OPER/STBY?

John KK9A


From: Ed Muns ed at w0yk.com
Sat Mar 18 14:25:12 EDT 2017

Based on the excellent KPA500 design, augmented by user experience, and the
added comments to Eric's question below, I'm confident Elecraft can define
another great product if they so choose.

My request is that the button colors be more functional than they are on the
KPA500.  "Black on Black" is aesthetically very cool in a well-lit
environment, but functionally very poor in most actual operational
environments.  Some of us have replaced the KPA500 button caps with gray and
other colors like on the K3, so we can find the buttons more readily.

Ed W0YK


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[Elecraft] Linear thoughts

[john]

What buttons are you using besides ON and maybe OPER/STBY?

John KK9A


From: Ed Muns ed at w0yk.com 
Sat Mar 18 14:25:12 EDT 2017

Based on the excellent KPA500 design, augmented by user experience, and the
added comments to Eric's question below, I'm confident Elecraft can define
another great product if they so choose.

My request is that the button colors be more functional than they are on the
KPA500.  "Black on Black" is aesthetically very cool in a well-lit
environment, but functionally very poor in most actual operational
environments.  Some of us have replaced the KPA500 button caps with gray and
other colors like on the K3, so we can find the buttons more readily.

Ed W0YK


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Re: [Elecraft] Linear thoughts

[Ed Muns]

Based on the excellent KPA500 design, augmented by user experience, and the
added comments to Eric's question below, I'm confident Elecraft can define
another great product if they so choose.

My request is that the button colors be more functional than they are on the
KPA500.  "Black on Black" is aesthetically very cool in a well-lit
environment, but functionally very poor in most actual operational
environments.  Some of us have replaced the KPA500 button caps with gray and
other colors like on the K3, so we can find the buttons more readily.

Ed W0YK


Eric WA6HHQ wrote:

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in

operation, what features etc would be important?

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Re: [Elecraft] Linear

[Erik Basilier]

Chris,

Shack simplification and cable reduction are indeed big values. But it can
lead to big boxes that are identified with a pre-conceived use case vision.
Other companies have made a good living from selling new generations of such
boxes. There will always be a market for that, with customers that can
afford it and enjoy the process. Elecraft has given us lower costs,
especiall as seen over time, by allowing some separation of boxes. This
results in more cables, but the proliferation of cables can be limited by a
network design that does more up front than allow for the next incremental
feature, in combination with some early planning for needed RF
interconnectons.

Erik

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chris
Tate - N6WM
Sent: Saturday, March 18, 2017 10:50 AM
To: j...@audiosystemsgroup.com
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear

Jim,

I would suggest testing the more mainstream 1.3 or 2kfa.  I agree that their
"clean ness" is important ( thus the observe and improve suggestion) but
what I was trying to emphasize is feature set.  They are on to something
with the solution in a box.  Cable reduction, shack simplification are way
up on the value scale.  Putting 2 inputs, and including the antenna ports
and isolation to provide listening on a band while transmitting on another
along with swr tolerance eliminates outboard bpf, tuner, wattmeter and a
second set of QRO equipment may just add the value to charge more for it
because you save in the end.  Clean tx is something all manufacturers should
strive for.

Thanks
~C.


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Re: [Elecraft] Linear thoughts

[Kevin]

Has the rule limiting gain to 15dB been changed or rescinded by the FCC yet?
Do you expect Elecraft to provide such a "mod" before the rule has 
changed? Snickerand cover it under warranty?



On 3/18/2017 12:01 PM, Gmail - George wrote:

I agree Dan,
Make a modification kit available to licensed operators and blessed by
Elecraft.
Kit of parts w/pc board would be ok by me.
Maybe one with 2 inputs - one for K3 (100 watt rigs) and another for KX2 or
KX3 (QRP) rigs.
Seems wasteful to feed the KPA500 with a KX3 + KPX100 to the input
attenuator in the KPA500; unless the attenuator is needed for performance
specs.
73
George
AI4VZ

-Original Message-
From: Dan Baker

It would be very nice to have the ability to make a unauthorized, unofficial
simple mod. Maybe call it the KX3 mod.
This mod would allow one to drive the amp to full output with a KX2 or KX3.

Dan KM6CQ

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--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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Re: [Elecraft] Linear

[Erik Basilier]

Well said Chris. I would add: 

Modularity should include combinations of power amplifier modules. 
Once there is more than one amplifier module, one may ask: Does it ever make
sense to use them in a way where the output power is not combined? When
output is to be fed alternately to different antennas, some switching can be
avoided by dedicating amplifier modules to specific antenna lines, but I
think fast enough switching capability available that this is not necessary.
However, if someone has invested in dual radio capability for running SO2R,
might he not someday want to run a contest in 2O2R, dedicating one radio and
amplifier module to each operator? Even if only one multiband antenna is
available, with a multiplexer it can transmit simultaneously with two
transmitters on different bands. Along this line of thinking, the user
interface is also to be considered. A control console would be awkward to
use by 2 operators, so you would need two consoles. This would be expensive,
and using existing K3's as user interfaces would look good.

Making small incremental improvements leads to quick success until it backs
you into a corner. Flex is showing an ability to take a broader view with
their SO2R support. What is missing there is looking beyone SO2R and
providing a path forward that doesn't necessitate replacing expensive boxes.

73,
Erik K7TV

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chris
Tate - N6WM
Sent: Saturday, March 18, 2017 9:22 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Linear

Lots of great feedback from all on the Elecraft brain trust.

There is a market shift occurring in the full or near qro market.  The 2
standouts are the Expert amp line, and the yet to be released Flex/4o3a
power genius.

One has to ask where the primary market for a full legal limit amp with
automation would be.  My opinion would be contesters, dxers and remote
station users.   Others would want such a device but may be less fickle on
feature set

Things like full qsk, quiet operation, modularity, and over engineering for
reliable operation at spec are already something that I think Elecraft would
provide as part of their well respected methodology.

In order to really be marketable it will need to provide additional value
above and beyond expert and flex/4o3a.

So again ability to use the 1 amp with 2 radios seamlessly in a rapid SO2R
environment would be huge.  The flex amp is professing to offer this sans
tuner.  The expert doesn't quite offer this but has a tuner.  Taking the
best of both and exceeding that would create a unique market differentiator.
If Elecraft could build an amp that could do the SO2R as well as handle high
swr tolerance and maintain their usual high standard of construction,
performance, reliability and support this would be THE go to amp in the
performance ham community IMO.  Keeping it as compact, lightweight and quiet
as possible is something Elecraft does with all their devices so it's the
features that will set it apart.  

Thanks
~C.
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Re: [Elecraft] Linear

[Chris Tate - N6WM]

Jim,

I would suggest testing the more mainstream 1.3 or 2kfa.  I agree that their 
"clean ness" is important ( thus the observe and improve suggestion) but what I 
was trying to emphasize is feature set.  They are on to something with the 
solution in a box.  Cable reduction, shack simplification are way up on the 
value scale.  Putting 2 inputs, and including the antenna ports and isolation 
to provide listening on a band while transmitting on another along with swr 
tolerance eliminates outboard bpf, tuner, wattmeter and a second set of QRO 
equipment may just add the value to charge more for it because you save in the 
end.  Clean tx is something all manufacturers should strive for.

Thanks
~C.

> On Mar 18, 2017, at 10:07 AM, Jim Brown  wrote:
> 
>> On Sat,3/18/2017 9:22 AM, Chris Tate - N6WM wrote:
>> The 2 standouts are the Expert amp line, and the yet to be released 
>> Flex/4o3a power genius.
> 
> Before calling an amplifier a standout, it must be CLEAN. Based on my 
> measurements, my SPE-1KFA is significantly broader on CW than my KPA500 and 
> Ten Tec 425s. That makes it a poor choice for contesting, where it's broader 
> signal increases QRM to other stations.
> 
> And how can the 4O3A amp be called a standout when it hasn't yet been tested? 
> Or are there tests somewhere I don't know about?
> 
> 73, Jim K9YC
> 
> 
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Re: [Elecraft] Linear

[Jim Brown]

On Sat,3/18/2017 9:22 AM, Chris Tate - N6WM wrote:

The 2 standouts are the Expert amp line, and the yet to be released Flex/4o3a 
power genius.


Before calling an amplifier a standout, it must be CLEAN. Based on my 
measurements, my SPE-1KFA is significantly broader on CW than my KPA500 
and Ten Tec 425s. That makes it a poor choice for contesting, where it's 
broader signal increases QRM to other stations.


And how can the 4O3A amp be called a standout when it hasn't yet been 
tested? Or are there tests somewhere I don't know about?


73, Jim K9YC


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Re: [Elecraft] Linear thoughts

[Gmail - George]

I agree Dan,
Make a modification kit available to licensed operators and blessed by 
Elecraft.
Kit of parts w/pc board would be ok by me.
Maybe one with 2 inputs - one for K3 (100 watt rigs) and another for KX2 or 
KX3 (QRP) rigs.
Seems wasteful to feed the KPA500 with a KX3 + KPX100 to the input 
attenuator in the KPA500; unless the attenuator is needed for performance 
specs.
73
George
AI4VZ

-Original Message- 
From: Dan Baker

It would be very nice to have the ability to make a unauthorized, unofficial 
simple mod. Maybe call it the KX3 mod.
This mod would allow one to drive the amp to full output with a KX2 or KX3.

Dan KM6CQ

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Re: [Elecraft] Linear thoughts

[Dan Baker]

It would be very nice to have the ability to make a unauthorized,
unofficial simple mod. Maybe call it the KX3 mod. This mod would allow one
to drive the amp to full output with a KX2 or KX3.

Dan KM6CQ
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[Elecraft] Linear

[Chris Tate - N6WM]

Lots of great feedback from all on the Elecraft brain trust.

There is a market shift occurring in the full or near qro market.  The 2 
standouts are the Expert amp line, and the yet to be released Flex/4o3a power 
genius.

One has to ask where the primary market for a full legal limit amp with 
automation would be.  My opinion would be contesters, dxers and remote station 
users.   Others would want such a device but may be less fickle on feature set

Things like full qsk, quiet operation, modularity, and over engineering for 
reliable operation at spec are already something that I think Elecraft would 
provide as part of their well respected methodology.

In order to really be marketable it will need to provide additional value above 
and beyond expert and flex/4o3a.

So again ability to use the 1 amp with 2 radios seamlessly in a rapid SO2R 
environment would be huge.  The flex amp is professing to offer this sans 
tuner.  The expert doesn't quite offer this but has a tuner.  Taking the best 
of both and exceeding that would create a unique market differentiator.  If 
Elecraft could build an amp that could do the SO2R as well as handle high swr 
tolerance and maintain their usual high standard of construction, performance, 
reliability and support this would be THE go to amp in the performance ham 
community IMO.  Keeping it as compact, lightweight and quiet as possible is 
something Elecraft does with all their devices so it's the features that will 
set it apart.  

Thanks
~C.
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Re: [Elecraft] Linear thoughts

[brian]

This is relevant.  The original ACOM2000 and ACOM antenna switch had to 
be used over a "network" for integration with the 2000.  The "network" 
was an unusual one that many people tried to write software to access 
without success.  There were all kinds of issues.  It ended up being 
unusable.


KISS would be better.  Either ASCII commands, analog voltage inputs or both.

Maybe this ACOM2000 situation has changed now.

73 de Brian/K3KO

On 3/18/2017 14:54 PM, K9MA wrote:

The capability of switching ATU settings for different antennas, on the
same band, with or without also switching output jacks.  Control via
simple logic signals, not only via serial commands and software.
Alternately, provide a stand-alone accessory box which could respond to
logic signals and send serial commands to the amplifier.


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Re: [Elecraft] Linear thoughts

[Kevin]

I forgot that the KPA500 and K3s are the same size. Point remains 
KPA1500AT won't fit in the KPA500/K3s box.



On 3/18/2017 9:57 AM, Kevin wrote:

I hate to interrupt the group fantasy but,

No way a "1500W key down forever any mode" solid state amp is going to 
be quiet, affordable, or fit in the KPA500 box, much less the K3s 
(that was funny). Add an internal tuner capable of "1500W key down 
forever any mode" and the box gets bigger, the fans get louder, and 
the price goes up. If you're planning on running this on 120V...just 
stop.


A power supply capable of "1500W key down forever any mode", 50V stiff 
@ 80 amps, isn't going to be light, quiet, and not be a switcher (that 
was funny too).


Remember, the prime directive is 160-6m "1500 W key down forever any 
mode". There isn't an SSPA for sale in the amateur market that can do 
that. So...you're paying $8K right now to get "close" (close is 
relative). If Elecraft can do it for 20% more good on 'em. Then you 
get to decide good down payment on a new car, or KPA1500.



R. Kevin Stover

AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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FISTS #11993
SKCC #215
NAQCC #3441


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Re: [Elecraft] Linear thoughts

[K9MA]

The capability of switching ATU settings for different antennas, on the 
same band, with or without also switching output jacks.  Control via 
simple logic signals, not only via serial commands and software.  
Alternately, provide a stand-alone accessory box which could respond to 
logic signals and send serial commands to the amplifier.


--
Scott  K9MA

k...@sdellington.us

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Re: [Elecraft] Linear thoughts

[N2TK, Tony]

Most everything desired has already been mentioned. Use SPE amps as a
baseline for features and learning curve.
- QSK  Preferably PIN diodes
- Remote capability like the KPA500 but with more monitoring capability so I
can put the amp in the basement alongside the KPA500.
- SO2R capability built in
- 2 rig inputs
- 4-6 antenna outputs programmable and easily switchable
- Low distortion LDMOS - single ended or two for push-pull. Max of two
MOSFETS.
- Switching supply naturally
- Optional built-in tuner that can handle at least 3:1. Amp without tuner
can handle at least 2:1 SWR without fold back on power.
- 1500W key down for digital on 160-6M
- Separate or combined amp/PS depends on size and weight.
- Amp/tuner tracks K3 receive for pre-tuning.
- some form of pre-distortion control to keep the amp clean at full output.

73,
N2TK, Tony


-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Eric
Swartz - WA6HHQ, Elecraft
Sent: Friday, March 17, 2017 1:07 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in
operation, what features etc would be important?

73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear Thoughts

[Philip Alley]

Instead on just another linear ( yawn!) why not apply the considerable Elecraft 
talents to developing a non linear highly efficient ( and light) all mode amp 
via the path described in this month's QEX?

Phil 
AA2EA
Louisville

Sent from my iPhone

> On Mar 17, 2017, at 4:51 PM, elecraft-requ...@mailman.qth.net wrote:
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> Today's Topics:
> 
>   1. Re: Linear thoughts (Alan. G4GNX)
>   2. Re: Linear thoughts (Peter LaBissoniere)
>   3. Re: Linear thoughts (Charlie Carroll)
>   4. Re: Linear thoughts (kd8...@aol.com)
>   5. Re: Linear thoughts (Wes Stewart)
>   6. Re: Linear thoughts (Wayne Burdick)
>   7. Re: Linear thoughts (Bud Semon)
>   8. Re: Linear thoughts (Kevin - K4VD)
>   9. Linear thoughts (Chuck Chandler)
>  10. Re: Linear thoughts (Guy Olinger K2AV)
>  11. New release of Win4K3Suite (Tom)
>  12. R: Re:  Linear thoughts (glcazz...@alice.it)
>  13. win4k3+hrd+dm780 (buddy s)
>  14. Re: Linear thoughts (Chris Tate - N6WM)
>  15. Re: Preamp 2 and upcoming F/W (Wayne Burdick)
>  16. Re: Linear thoughts (Mitch)
>  17. OT: RFI problem  on 80,40 with AT Uverse (John Saxon)
>  18. Re: (Elecraft) Linear thoughts (Thomas Donohue)
>  19. Re: OT: RFI problem on 80,40 with AT Uverse (Fred Moore)
>  20. Re: Linear thoughts (Bert Garcia N8NN)
>  21. Re: Linear thoughts (brian)
>  22. Re: OT: RFI problem on 80,40 with AT Uverse (brian)
>  23. Re: Linear thoughts (John Fritze)
>  24. Re: Linear thoughts (Wes Stewart)
>  25. Re: Linear thoughts (k...@aol.com)
>  26. Re: OT: RFI problem on 80,40 with AT Uverse (Mike Flowers)
>  27. Re: Linear thoughts (Clay Autery)
> 
> 
> --
> 
> Message: 1
> Date: Fri, 17 Mar 2017 18:01:36 -
> From: "Alan. G4GNX" <g4...@theatreorgans.co.uk>
> To: "Gerald Manthey" <kc6...@gmail.com>,"Eric Swartz - WA6HHQ,
>Elecraft" <e...@elecraft.com>
> Cc: <elecraft@mailman.qth.net>
> Subject: Re: [Elecraft] Linear thoughts
> Message-ID: <73DF0824F12343439B9563F6C1F324DC@G4GNXLaptop>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>reply-type=original
> 
> Also, same facilities as KPA500 and built in KAT1500 tuner.
> 
> 73,
> 
> Alan. G4GNX
> 
> -Original Message- 
> From: Gerald Manthey
> Sent: Friday, March 17, 2017 5:24 PM
> To: Eric Swartz - WA6HHQ, Elecraft
> Cc: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Linear thoughts
> 
> Super quiet fans! Full duty cycle.
> 
> 
>> On Mar 17, 2017, at 12:06 PM, Eric Swartz - WA6HHQ, Elecraft 
>> <e...@elecraft.com> wrote:
>> 
>> Interesting discussion.
>> 
>> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 
>> in operation, what features etc would be important?
>> 
>> 73,
>> Eric
>> /elecraft.com/ 
> 
> 
> 
> --
> 
> Message: 2
> Date: Fri, 17 Mar 2017 13:02:27 -0500
> From: Peter LaBissoniere <k...@wi.rr.com>
> To: "Eric Swartz - WA6HHQ, Elecraft" <e...@elecraft.com>
> Cc: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Linear thoughts
> Message-ID: <50c9a5c6-0620-4055-8604-de9a97d47...@wi.rr.com>
> Content-Type: text/plain;charset=us-ascii
> 
> KPA-500 trade-in program.
> 
> Sent from my iPhone
> 
>> On Mar 17, 2017, at 12:06 PM, Eric Swartz - WA6HHQ, Elecraft 
>> <e...@elecraft.com> wrote:
>> 
>> Interesting discussion.
>> 
>> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
>> operation, what features etc would be important?
>> 
>> 73,
>> Eric
>> /elecraft.com/
>> 
>> 
>> __
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&g

Re: [Elecraft] Linear thoughts on pricing

[bill steffey]

one pricing advantage Elecraft has
over the flex...  no need to have the importer ( Flex)
& the Manufacturer (Ranko 403A) in Montenegro both making a profit



1. connectivity for predistortion
2.   trade in allowancefor my   ACOMhih 



bill

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Re: [Elecraft] Linear thoughts

[DaleJ]

A box which has a combiner for using two KPA500’s in unison plus 
pre-distortion.  

Dale, K9VUJ  
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Re: [Elecraft] Linear thoughts

[Wes Stewart]

You haven't been paying attention.  I asked for both of those.

On 3/17/2017 5:20 PM, Gary K9GS wrote:

A lot of great suggestions but two I have not seen discussed:

1)  I really like the idea of a separate power supply simply because if the 
amp has to ever go in for service or be shipped it is a lot easier without a 
heavy power supply inside the cabinet. Just send the RF deck to Elecraft.


2)  I like the idea of an optional INTERNAL tuner.  Makes it nice and clean 
for those that need a tuner without a rats nest of Y cables, etc.  If there is 
going to be an external tuner make it weatherproof so you can put it OUTSIDE.


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Re: [Elecraft] Linear thoughts

[Jim Miller]

and I didn't mention price because I really don't care. Not that I'm loaded
but I know that what I'm asking for isn't cheap. But I've always found
Elecraft to be excellent value for the money.

nuff said.

jim ab3cv

On Fri, Mar 17, 2017 at 10:19 PM, Jim Miller  wrote:

> Forgot to mention:
>
> I hate the fan noise of the ACOM1500. KPA1500 should emulate the KPA500,
> noise only when necessary!
>
> On Fri, Mar 17, 2017 at 9:56 PM, Jim Miller  wrote:
>
>> TLDR version: Basically I want a full legal limit key down version of the
>> KPA500 and a companion ala KAT1500
>>
>> Details:
>>
>> I recently purchased a ACOM1500 while biding my time for a KPA1500. (I
>> already have a KPA500 and really like it.)
>>
>> Things I don't like about this tube amp::
>> 1. Tuning
>> 2. Waiting for warm up
>> 3. No chance of remote operation
>> 4. Not capable of 1500w on 6M JT65 (~1minute key down)
>> 5. Not capable of 1500w RTTY
>> 6. Obviously not integrated with K3 wrt band changing.
>>
>> What I want:
>> 1. Full legal limit 160 thru 6m including for JT65 (including 6m for EME
>> ~1minute key down) and RTTY. I like that I don't have to baby the KPA500.
>> 2. Full integration with K3 ala KPA500. Band changing, per band power,
>> etc.
>> 3. KAT1500 built in or separate (doesn't matter). Needed primarily for
>> 80m vertical and 160 inverted L which is likely what almost everyone needs.
>> 160 SWR needs at least 3:1 and preferably 5:1 capability, ditto 80m. I use
>> a single 7/8" hardline to a remote antenna switch. Loss is minimal for 80
>> and 160. Other bands are served by Steppir or monoband 6m.
>> 4. Must be capable of remote operation as least as good as KPA500, e.g.,
>> ON/OFF, status monitoring, fault recovery, fault reporting. I'm sure
>> remoting is in my future in my next QTH choice.
>> 5. QSK. I like being able to hear when the DX is responding and kill my
>> call when I hear it.
>> 6. Most importantly Elecraft quality, service and support!
>>
>> Some thoughts:
>> I really don't care if the PSU is integrated or not but I'd like a
>> profile similar to the KPA500 if possible. I like having the KPA (KAT on
>> top) aside the P3/K3s which sit nicely below my wall mounted monitors.
>> Excellent ergonomics.
>>
>> Making the PSU switchable between 110 and 220 (for NA) and limiting
>> output accordingly would make it possible to serve 1KW and 1.5KW market
>> with a single amp which would be upgradable by running 220 to the shack.
>> Might broaden the appeal.
>>
>> Remote operation is important as we will likely be downsizing and as a
>> result my rig will be at my daughter's house where I will have occasional
>> access for contesting but most of my DXing will be remotely from my house.
>> Great remote operation is a must.
>>
>> 73
>>
>> jim ab3cv (credit card ready for immediate purchase!)
>>
>>
>> On Fri, Mar 17, 2017 at 1:06 PM, Eric Swartz - WA6HHQ, Elecraft <
>> e...@elecraft.com> wrote:
>>
>>> Interesting discussion.
>>>
>>> Folks, if we did introduce a 1500 W solid state amp similar to our
>>> KPA500 in operation, what features etc would be important?
>>>
>>> 73,
>>> Eric
>>> /elecraft.com/
>>>
>>>
>>> __
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>>>
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>>> Message delivered to j...@jtmiller.com
>>>
>>
>>
>
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Re: [Elecraft] Linear thoughts

[Jim Miller]

Forgot to mention:

I hate the fan noise of the ACOM1500. KPA1500 should emulate the KPA500,
noise only when necessary!

On Fri, Mar 17, 2017 at 9:56 PM, Jim Miller  wrote:

> TLDR version: Basically I want a full legal limit key down version of the
> KPA500 and a companion ala KAT1500
>
> Details:
>
> I recently purchased a ACOM1500 while biding my time for a KPA1500. (I
> already have a KPA500 and really like it.)
>
> Things I don't like about this tube amp::
> 1. Tuning
> 2. Waiting for warm up
> 3. No chance of remote operation
> 4. Not capable of 1500w on 6M JT65 (~1minute key down)
> 5. Not capable of 1500w RTTY
> 6. Obviously not integrated with K3 wrt band changing.
>
> What I want:
> 1. Full legal limit 160 thru 6m including for JT65 (including 6m for EME
> ~1minute key down) and RTTY. I like that I don't have to baby the KPA500.
> 2. Full integration with K3 ala KPA500. Band changing, per band power, etc.
> 3. KAT1500 built in or separate (doesn't matter). Needed primarily for 80m
> vertical and 160 inverted L which is likely what almost everyone needs. 160
> SWR needs at least 3:1 and preferably 5:1 capability, ditto 80m. I use a
> single 7/8" hardline to a remote antenna switch. Loss is minimal for 80 and
> 160. Other bands are served by Steppir or monoband 6m.
> 4. Must be capable of remote operation as least as good as KPA500, e.g.,
> ON/OFF, status monitoring, fault recovery, fault reporting. I'm sure
> remoting is in my future in my next QTH choice.
> 5. QSK. I like being able to hear when the DX is responding and kill my
> call when I hear it.
> 6. Most importantly Elecraft quality, service and support!
>
> Some thoughts:
> I really don't care if the PSU is integrated or not but I'd like a profile
> similar to the KPA500 if possible. I like having the KPA (KAT on top) aside
> the P3/K3s which sit nicely below my wall mounted monitors. Excellent
> ergonomics.
>
> Making the PSU switchable between 110 and 220 (for NA) and limiting output
> accordingly would make it possible to serve 1KW and 1.5KW market with a
> single amp which would be upgradable by running 220 to the shack. Might
> broaden the appeal.
>
> Remote operation is important as we will likely be downsizing and as a
> result my rig will be at my daughter's house where I will have occasional
> access for contesting but most of my DXing will be remotely from my house.
> Great remote operation is a must.
>
> 73
>
> jim ab3cv (credit card ready for immediate purchase!)
>
>
> On Fri, Mar 17, 2017 at 1:06 PM, Eric Swartz - WA6HHQ, Elecraft <
> e...@elecraft.com> wrote:
>
>> Interesting discussion.
>>
>> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500
>> in operation, what features etc would be important?
>>
>> 73,
>> Eric
>> /elecraft.com/
>>
>>
>> __
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>> Message delivered to j...@jtmiller.com
>>
>
>
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Re: [Elecraft] Linear thoughts

[Erik Basilier]

Regarding spending capacity, I agree that the Elecraft KPA1500 with tuner
would be too expensive to appeal to a lot of people, including myself.
However, looking back I can see that I have been able to spend a smaller but
substantial amount several times. A modular approach to the design would
make it possible to get to 500W first, for a price not too different from
the KPA500, and then add modules/capability later. This approach also makes
more sense for hams in countiries where 1500W or even 1000W is not allowed.
Combining lower power modules leads to higher production numbers, which
should help reduce per-unit cost.

73,
Erik K7TV

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of w7aqk
Sent: Friday, March 17, 2017 6:59 PM
To: Elecraft Reflector <elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Linear thoughts

Hi All,

I don't really have an oar in this debate, since I am 99.99% sure I won't be
buying one--a 1500 watt linear, that is.  However, it seems to me that all
this advice to Eric should include some reasonable estimate of what one
would be willing to pay for it!!!  So far, I think I've only seen one such
estimate--3 times the cost of a KPA500, which is probably a fair guess!  If
you throw in the upgraded tuner, you are talking $7500 or so!  Wow!  $5000
more just to gain slightly less than 1 S unit!  I like to think in terms  of
$/S unit, rather than $/watt.  The latter seems meaningless at this level!

Well, some folks will probably spend that in a heartbeat!  I guess that's
about what the new Flex amp everyone is talking about will cost.  If
Elecraft could do it for much less, they may be on to something!  Still, at
this price level, a few hundred bucks one way or another may not mean that
much.  Nonetheless, I think we do need some feel for a price point to keep
appetites in check.

For what it is worth, I think keeping the ATU external gives people an
opportunity to control cost somewhat.  A big plus would be access to
Elecraft support!

Even sitting on the sidelines this is rather fascinating!

Dave W7AQK


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Re: [Elecraft] Linear thoughts

[Rick WA6NHC]

I've had pretty good success with the KPA500, but since you asked, 
another couple S units is always better than less.  If you don't need 
1500 out, dial it back.  You can't push a smaller amp up, but you can 
throttle a large amp down... there if you need it.


Matching automatic tuner with the K3 and KAT 10:1 range (stuff happens, 
give it room to compensate), built in; more than 3 antenna ports.  
Consider SO2R modes for contesters (multiple inputs).


Enough power supply and transistor overhead to be able to 'comfortably' 
run at full power on RTTY, or whatever abusive mode is needed.


QUIET.  Period, quiet.  Both to the ears and nearby stations (clean amp)

Keep the drive required from the K3 low for a cleaner overall 
transmission (reduce IMD).


The usual Elecraft quality with total integration.

I suspect that your main issue will be in keeping the cost competitive.

Rick NHC (one HAPPY customer)


On 3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our 
KPA500 in operation, what features etc would be important?


73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[w7aqk]

Hi All,

I don't really have an oar in this debate, since I am 99.99% sure I won't be 
buying one--a 1500 watt linear, that is.  However, it seems to me that all 
this advice to Eric should include some reasonable estimate of what one 
would be willing to pay for it!!!  So far, I think I've only seen one such 
estimate--3 times the cost of a KPA500, which is probably a fair guess!  If 
you throw in the upgraded tuner, you are talking $7500 or so!  Wow!  $5000 
more just to gain slightly less than 1 S unit!  I like to think in terms  of 
$/S unit, rather than $/watt.  The latter seems meaningless at this level!


Well, some folks will probably spend that in a heartbeat!  I guess that's 
about what the new Flex amp everyone is talking about will cost.  If 
Elecraft could do it for much less, they may be on to something!  Still, at 
this price level, a few hundred bucks one way or another may not mean that 
much.  Nonetheless, I think we do need some feel for a price point to keep 
appetites in check.


For what it is worth, I think keeping the ATU external gives people an 
opportunity to control cost somewhat.  A big plus would be access to 
Elecraft support!


Even sitting on the sidelines this is rather fascinating!

Dave W7AQK


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Re: [Elecraft] Linear thoughts

[Jim Miller]

TLDR version: Basically I want a full legal limit key down version of the
KPA500 and a companion ala KAT1500

Details:

I recently purchased a ACOM1500 while biding my time for a KPA1500. (I
already have a KPA500 and really like it.)

Things I don't like about this tube amp::
1. Tuning
2. Waiting for warm up
3. No chance of remote operation
4. Not capable of 1500w on 6M JT65 (~1minute key down)
5. Not capable of 1500w RTTY
6. Obviously not integrated with K3 wrt band changing.

What I want:
1. Full legal limit 160 thru 6m including for JT65 (including 6m for EME
~1minute key down) and RTTY. I like that I don't have to baby the KPA500.
2. Full integration with K3 ala KPA500. Band changing, per band power, etc.
3. KAT1500 built in or separate (doesn't matter). Needed primarily for 80m
vertical and 160 inverted L which is likely what almost everyone needs. 160
SWR needs at least 3:1 and preferably 5:1 capability, ditto 80m. I use a
single 7/8" hardline to a remote antenna switch. Loss is minimal for 80 and
160. Other bands are served by Steppir or monoband 6m.
4. Must be capable of remote operation as least as good as KPA500, e.g.,
ON/OFF, status monitoring, fault recovery, fault reporting. I'm sure
remoting is in my future in my next QTH choice.
5. QSK. I like being able to hear when the DX is responding and kill my
call when I hear it.
6. Most importantly Elecraft quality, service and support!

Some thoughts:
I really don't care if the PSU is integrated or not but I'd like a profile
similar to the KPA500 if possible. I like having the KPA (KAT on top) aside
the P3/K3s which sit nicely below my wall mounted monitors. Excellent
ergonomics.

Making the PSU switchable between 110 and 220 (for NA) and limiting output
accordingly would make it possible to serve 1KW and 1.5KW market with a
single amp which would be upgradable by running 220 to the shack. Might
broaden the appeal.

Remote operation is important as we will likely be downsizing and as a
result my rig will be at my daughter's house where I will have occasional
access for contesting but most of my DXing will be remotely from my house.
Great remote operation is a must.

73

jim ab3cv (credit card ready for immediate purchase!)


On Fri, Mar 17, 2017 at 1:06 PM, Eric Swartz - WA6HHQ, Elecraft <
e...@elecraft.com> wrote:

> Interesting discussion.
>
> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500
> in operation, what features etc would be important?
>
> 73,
> Eric
> /elecraft.com/
>
>
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Re: [Elecraft] Linear thoughts

[Erik Basilier]

To add to my thoughts on new Elecraft QRO amp's in a new system
architecture:

Amp modules could be produced in multiple generations as RF power transistor
technology evolves. I envision models capable of 500, 750 or 1000 W pep, and
it should be possible to combine up to 4 modules for use with any one
virtual radio. 

A virtual radio could be a physica radio like a K3/K3S, or it could be truly
virtual, based on an ADC working with signals at on-the-air frequency.

In the scenario of multiple amp modules working in parallel, external tuners
are mandatory. However an amp module could have space inside for an internal
tuner option.
There could be a weatherization option that allows such an amp module to be
mounted outdoors. Remember, every amp module is built for remote control
rather than front panel controls. One amp module using KPA500 technology
would cost a little less than an actual KPA500 with its fancy front panel.
There would be an upgrade/addon that would make the KPA500 able to play the
role of one of the new amp's based on KPA500 technology and capabilities.

If you forgive me for the antropomorphic approach, the persona of a "display
module" might present itself as follows: 
" Hi, in my old job I used to be a panadapter. I would be the team member
doing everything related to panadapter work, but not much else. Well,
recently I have accepted some additional tasks such as transmitter
monitoring and user interface for communications. In my new job, I make my
hardware resources (display and processing power) available to serve any
capability the team wishes to implement, and even multiple simultaneous
capabilities." That attitude of serving multiple purposes would exist in
other modules as well.

73,
Erik K7TV

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Erik
Basilier
Sent: Friday, March 17, 2017 3:00 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Linear thoughts

To make this an Elecraft amp, it should be designed based on the best
architectural ideas from the Elecraft tradition. At this point of the
evolution, this must be seen at the system level, including the (never-to-be
?) "K4" and all other "K-line" components.

 

Why such a broad scope? The present chaining together of control cables is
showing its limits. When major features are to be introduced, maximum
flexibility is achieved when control signals from A to B don't have to
travel through multiple boxes. A client-server approach is appropriate,
maybe using Ethernet as backbone. Won't this shut out the owners of
non-Elecraft equipment? No, each box will still have a a more conventional
control interface. Once a user adds more than one Elecraft box, fast
intercommunication between those boxes may provide features not practical if
the second box were of a different brand.

 

Key Elecraft philosophies to build on. Value retention. No need to buy a
whole new rig to add functionality. Modularity. Today we can add options
inside the K3(s). That is great as long as the box is small and light. It is
particularly valuable for portable use. Having to bring extra boxes on a
camping trip, and deal with the wiring between them, is aggravating.
Elecraft put paddles on the KX3 box, and a microphone in the KX2 for a
reason. For the home shack adding boxes is necessary to avoid any box
becoming too big or heavy. It also is necessary to make possible extensive
additions to functionality. A challenge with multiple boxes is to make sure
the functional assets in a given box are all available to global
applications that depend on resources spread among the boxes. The networking
architecture is key for this. 

 

High power amplifiers should probably be limited to less than max legal
power, but the overall architecture should include the components needed to
run more than one such amplifier in parallel. Each amp should be designed to
work with a separate controller, and have a minimum of front panel controls.
With multiple amp's available one should be able to quickly reallocate those
resources between a single or multiple virtual radios.

 

Graphic display resources. We should still have the option for a very
compact and portable user interface, such as the K3 without P3. When an
upgraded P3 is available, it should be able to display more information than
what is the case today. A new display box would make sense for even greater
capabilities (higher resolution external display compared to P3, as well as
bigger built-in screen options). Could be part of new control console. 

 

Central controllers. There should be multiple options. Some people may love
to work from a PC screen, and that might also suit the user who starts out
with just one box from the new architecture. Others may prefer a special
harware console, or working from a slightly upgraded K3 (or K4). 

 

73,

Erik K7TV

 

 

__
Elecraft m

[Elecraft] Linear thoughts

[Chuck Chandler]

I'm gonna quote a previous poster:

"...Needless to say, full perfect QSK at 110 WPM, zero IMD, and be able to
eliminate TX phase noise if used with some notable non-Elecraft
transmitters.  An LCD display for a trapezoid pattern to assure linearity
would be a plus but not essential since it's going to be perfectly linear
anyway..."

Never mind that, how about the Solar Flux Enhancer?  That's what we really
need...

73 de Chuck, WS1L

-- 


===
Chuck Chandler
chandler...@gmail.com
===
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[Elecraft] Linear thoughts

[Ron Durie]

Same size box as the KPA500, with the internal switching supply.
It could actually weigh less than the KPA500. 
This would be an achievement that would be unique to Elecraft and desirable.

The tuner would be in an external box, same width and depth as the amp.

If it could be done for twice the price ($4200) of the KPA500, it would have
some market. 

Ron Durie
WB4OOA
Elecraft K3s-Line IMD



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Re: [Elecraft] Linear thoughts

[Gary K9GS]

A lot of great suggestions but two I have not seen discussed:

1)  I really like the idea of a separate power supply simply because if 
the amp has to ever go in for service or be shipped it is a lot easier 
without a heavy power supply inside the cabinet. Just send the RF deck 
to Elecraft.


2)  I like the idea of an optional INTERNAL tuner.  Makes it nice and 
clean for those that need a tuner without a rats nest of Y cables, etc.  
If there is going to be an external tuner make it weatherproof so you 
can put it OUTSIDE.


I would love a 1.5K+ amp with a K3 type legal limit tuner I can put outside.



On 3/17/2017 6:59 PM, Fred Jensen wrote:
The "KPA1500" should look, feel, and behave like a KPA500.  OK, it can 
weigh a little more but should be liftable by your average age ham 
[oldish].  If you want to sell it widely, the "KAT1500" will also be 
needed since there are a whole bunch of folks who have less than 
monoband stacks on all bands, but it needs to be either an internal or 
external option, some won't need it.


Fans should make no noise whatsoever, even on high speed.  Rated for 
100% duty cycle to accommodate RTTY, JT65, and 75 meter AM looong 
transmissions.  It shouldn't cost more than 3 times a KPA500, same 
$/watt.  It should accept higher VSWR's than the KPA500, say maybe 
3:1?  A plus would be operation on a 20A 120V circuit and/or a sagging 
generator.  Needless to say, full perfect QSK at 110 WPM, zero IMD, 
and be able to eliminate TX phase noise if used with some notable 
non-Elecraft transmitters.  An LCD display for a trapezoid pattern to 
assure linearity would be a plus but not essential since it's going to 
be perfectly linear anyway.


Very tough market to enter, and potential customers can be so very 
fickle.


73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn

PS:  Before blood pressures rise, paragraph 2 is a feeble [very] 
attempt at some humor based on passages on this list.  A deep breath 
or two would be best.  I believe paragraph 3 is true however, and I 
really want to see Elecraft stay in business.



On Fri,3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:
Folks, if we did introduce a 1500 W solid state amp similar to our 
KPA500 in operation, what features etc would be important?




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--
73,

Gary K9GS

Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com
CW Ops #1032   http://www.cwops.org



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Re: [Elecraft] Linear thoughts

[Bill Frantz]

Speaking as someone who has never operated above 100W, in other 
words -- I don't know what I really want:


  100% duty cycle for RTTY, FM etc.

  Make it possible to have the big, bulky, noisy items 
separable from the control head.


  Make it possible to locate the amp (& tuner) near the 
antenna(s) so the long coax run from the shack can be thin and 
unobtrusive -- think RG-58 or even RG-174. (XYL request)


  Wide range tuner option.

  Have tuner coexist well with autotuning antennas e.g. StepIR.

  Automatically switchable to multiple antennas based on band 
in use. (I've had up to 5 antennas on my 8 position remote switch.)


  Allow at least two coax connections to the radio (K3) to 
support diversity reception with remote switching.


  Low power operation on power limited bands.

  220V only is acceptable.

  Continue the legendary Elecraft usability and integration. 
i.e. Make it as easy to use as a 100W K3 on CW, digital, and voice.


  Give us a clean signal we can be proud of.

73 Bill AE6JV

On 3/17/17 at 10:06 AM, e...@elecraft.com (Eric Swartz - WA6HHQ, 
Elecraft) wrote:


Folks, if we did introduce a 1500 W solid state amp similar to 
our KPA500 in operation, what features etc would be important?

---
Bill Frantz| "I wish there was a knob on the TV to turn 
up the
408-356-8506   | intelligence.  There's a knob called 
"brightness", but

www.pwpconsult.com | it doesn't work. -- Gallagher

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Re: [Elecraft] Linear thoughts

[Fred Jensen]

The "KPA1500" should look, feel, and behave like a KPA500.  OK, it can 
weigh a little more but should be liftable by your average age ham 
[oldish].  If you want to sell it widely, the "KAT1500" will also be 
needed since there are a whole bunch of folks who have less than 
monoband stacks on all bands, but it needs to be either an internal or 
external option, some won't need it.


Fans should make no noise whatsoever, even on high speed.  Rated for 
100% duty cycle to accommodate RTTY, JT65, and 75 meter AM looong 
transmissions.  It shouldn't cost more than 3 times a KPA500, same 
$/watt.  It should accept higher VSWR's than the KPA500, say maybe 3:1?  
A plus would be operation on a 20A 120V circuit and/or a sagging 
generator.  Needless to say, full perfect QSK at 110 WPM, zero IMD, and 
be able to eliminate TX phase noise if used with some notable 
non-Elecraft transmitters.  An LCD display for a trapezoid pattern to 
assure linearity would be a plus but not essential since it's going to 
be perfectly linear anyway.


Very tough market to enter, and potential customers can be so very fickle.

73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn

PS:  Before blood pressures rise, paragraph 2 is a feeble [very] attempt 
at some humor based on passages on this list.  A deep breath or two 
would be best.  I believe paragraph 3 is true however, and I really want 
to see Elecraft stay in business.



On Fri,3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:
Folks, if we did introduce a 1500 W solid state amp similar to our 
KPA500 in operation, what features etc would be important?




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Re: [Elecraft] Linear thoughts

[Gary Gregory]

Will take food stamps to feed my habit too?
:-)

On Mar 18, 2017 9:41 AM, "Roger Meadows" <romeado...@outlook.com> wrote:

> I’ll be one of the first in line to buy one of the trade ins…..
>
> On Mar 17, 2017, at 6:09 PM, Bill Johnson <k9...@live.com<mailto:k9yeq@
> live.com>> wrote:
>
> I echo that or, offer a combiner second KPA500 to add to the existing!  I
> cannot safely lift over 40 lbs. but I can lift that twice!  Just not
> together.
>
> 72 & 73,
> Bill
> K9YEQ, FT'er for K2, KX1, KX3, KXPA100,  KAT500, W2, etc.
> -Original Message-
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
> Peter LaBissoniere
> Sent: Friday, March 17, 2017 1:02 PM
> To: Eric Swartz - WA6HHQ, Elecraft <e...@elecraft.com<mailto:eric
> @elecraft.com>>
> Cc: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
> Subject: Re: [Elecraft] Linear thoughts
>
> KPA-500 trade-in program.
>
> Sent from my iPhone
>
> On Mar 17, 2017, at 12:06 PM, Eric Swartz - WA6HHQ, Elecraft <
> e...@elecraft.com<mailto:e...@elecraft.com>> wrote:
>
> Interesting discussion.
>
> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500
> in operation, what features etc would be important?
>
> 73,
> Eric
> /elecraft.com/<http://elecraft.com/>
>
>
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Re: [Elecraft] Linear thoughts

[Roger Meadows]

I’ll be one of the first in line to buy one of the trade ins…..

On Mar 17, 2017, at 6:09 PM, Bill Johnson 
<k9...@live.com<mailto:k9...@live.com>> wrote:

I echo that or, offer a combiner second KPA500 to add to the existing!  I 
cannot safely lift over 40 lbs. but I can lift that twice!  Just not together.

72 & 73,
Bill
K9YEQ, FT'er for K2, KX1, KX3, KXPA100,  KAT500, W2, etc.
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Peter 
LaBissoniere
Sent: Friday, March 17, 2017 1:02 PM
To: Eric Swartz - WA6HHQ, Elecraft <e...@elecraft.com<mailto:e...@elecraft.com>>
Cc: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Linear thoughts

KPA-500 trade-in program.

Sent from my iPhone

On Mar 17, 2017, at 12:06 PM, Eric Swartz - WA6HHQ, Elecraft 
<e...@elecraft.com<mailto:e...@elecraft.com>> wrote:

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
operation, what features etc would be important?

73,
Eric
/elecraft.com/<http://elecraft.com/>


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k...@wi.rr.com<mailto:k...@wi.rr.com>

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Re: [Elecraft] Linear thoughts

[Jim Brown]

On Fri,3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:
Folks, if we did introduce a 1500 W solid state amp similar to our 
KPA500 in operation, what features etc would be important?


Full break-in, as clean as a good tube amp, legal limit through 6M with 
50% duty cycle (to support keydown modes like JT65, JT9). The general 
operational characteristics of a KPA500. A matching or integral antenna 
tuner. Light weight for airline travel -- IF the SMPS that would be 
required to do this was so quiet that it could not be heard on an 
antenna 20-30 ft away in a quiet location. :)


73, Jim K9YC


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Re: [Elecraft] Elecraft Linear

[Dave Cole]

I have a short review, and some heat/cool graphs of the ALS-1306 at:
http://nk7z.net/review-of-ameritrons-als-1306-amplifier/
I also have it connected to my K3, and it is now working great, follows 
the bands, etc.


73s and thanks,
Dave
NK7Z
http://www.nk7z.net

On 03/17/2017 03:38 PM, Dennis W0JX via Elecraft wrote:

I am waiting for the right solid state linear to make the move away from tube 
amps. Here is a list of features I would like to have in order of importance:

1.) Power - at least 1200 watts out. I use an 40 year old SB-220 almost every 
day 80-10 for DXing. That power level is adequate for 80 meter DXing. I
 have separate amps for 160 and 6 but would like to see a 160-6 meter solid 
state amp. It does not need full power for RTTY as I usually run my
 amps at reduced power in that mode;

2.) Quiet - Fan and blower noise is a major distraction;

3.) SWR tolerance - up to 1.75 or 2 to 1 without an external tuner;

4.) Auto band switching - follow the rig;

5.) Remote control head and remote control ability;

6.) QSK - relatively unimportant, I use a foot switch;

7.) Price - competitive - I would rather buy American and spend my money for US 
equipment.

73 Dennis W0JX

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[Elecraft] Elecraft Linear

[Dennis W0JX via Elecraft]

I am waiting for the right solid state linear to make the move away from tube 
amps. Here is a list of features I would like to have in order of importance:

1.) Power - at least 1200 watts out. I use an 40 year old SB-220 almost every 
day 80-10 for DXing. That power level is adequate for 80 meter DXing. I 
 have separate amps for 160 and 6 but would like to see a 160-6 meter solid 
state amp. It does not need full power for RTTY as I usually run my 
 amps at reduced power in that mode;

2.) Quiet - Fan and blower noise is a major distraction;

3.) SWR tolerance - up to 1.75 or 2 to 1 without an external tuner;

4.) Auto band switching - follow the rig;

5.) Remote control head and remote control ability;

6.) QSK - relatively unimportant, I use a foot switch;

7.) Price - competitive - I would rather buy American and spend my money for US 
equipment.

73 Dennis W0JX  

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Re: [Elecraft] Linear thoughts

[Bill Johnson]

I echo that or, offer a combiner second KPA500 to add to the existing!  I 
cannot safely lift over 40 lbs. but I can lift that twice!  Just not together.  

72 & 73,
Bill
K9YEQ, FT'er for K2, KX1, KX3, KXPA100,  KAT500, W2, etc. 
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Peter 
LaBissoniere
Sent: Friday, March 17, 2017 1:02 PM
To: Eric Swartz - WA6HHQ, Elecraft <e...@elecraft.com>
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

KPA-500 trade-in program.

Sent from my iPhone

> On Mar 17, 2017, at 12:06 PM, Eric Swartz - WA6HHQ, Elecraft 
> <e...@elecraft.com> wrote:
> 
> Interesting discussion.
> 
> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
> operation, what features etc would be important?
> 
> 73,
> Eric
> /elecraft.com/
> 
> 
> __
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> k...@wi.rr.com

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[Elecraft] Linear thoughts

[Erik Basilier]

To make this an Elecraft amp, it should be designed based on the best
architectural ideas from the Elecraft tradition. At this point of the
evolution, this must be seen at the system level, including the (never-to-be
?) "K4" and all other "K-line" components.

 

Why such a broad scope? The present chaining together of control cables is
showing its limits. When major features are to be introduced, maximum
flexibility is achieved when control signals from A to B don't have to
travel through multiple boxes. A client-server approach is appropriate,
maybe using Ethernet as backbone. Won't this shut out the owners of
non-Elecraft equipment? No, each box will still have a a more conventional
control interface. Once a user adds more than one Elecraft box, fast
intercommunication between those boxes may provide features not practical if
the second box were of a different brand.

 

Key Elecraft philosophies to build on. Value retention. No need to buy a
whole new rig to add functionality. Modularity. Today we can add options
inside the K3(s). That is great as long as the box is small and light. It is
particularly valuable for portable use. Having to bring extra boxes on a
camping trip, and deal with the wiring between them, is aggravating.
Elecraft put paddles on the KX3 box, and a microphone in the KX2 for a
reason. For the home shack adding boxes is necessary to avoid any box
becoming too big or heavy. It also is necessary to make possible extensive
additions to functionality. A challenge with multiple boxes is to make sure
the functional assets in a given box are all available to global
applications that depend on resources spread among the boxes. The networking
architecture is key for this. 

 

High power amplifiers should probably be limited to less than max legal
power, but the overall architecture should include the components needed to
run more than one such amplifier in parallel. Each amp should be designed to
work with a separate controller, and have a minimum of front panel controls.
With multiple amp's available one should be able to quickly reallocate those
resources between a single or multiple virtual radios.

 

Graphic display resources. We should still have the option for a very
compact and portable user interface, such as the K3 without P3. When an
upgraded P3 is available, it should be able to display more information than
what is the case today. A new display box would make sense for even greater
capabilities (higher resolution external display compared to P3, as well as
bigger built-in screen options). Could be part of new control console. 

 

Central controllers. There should be multiple options. Some people may love
to work from a PC screen, and that might also suit the user who starts out
with just one box from the new architecture. Others may prefer a special
harware console, or working from a slightly upgraded K3 (or K4). 

 

73,

Erik K7TV

 

 

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[Elecraft] Linear thoughts

[john]

Perfect suggestion Andy! The 70 pound luggage days are long gone.

John KK9A


From: Andrew Faber andrewfaber at ymail.com 
Fri Mar 17 13:18:39 EDT 2017

Eric,
Hallelujah!  First acknowledgment of such a possibility!  I vote to put a 
second amp module in the RF Deck (i.e., an RF deck that is the same as the 
total size of the KPA500) and have a separate switching supply in another 
box. 1200-1300 watts would be a sweet spot if 1.5K is a problem.  Shoot for 
30 pounds or under.
73, andy ae6y (KPA500 ser. 77).

-Original Message- 
From: Eric Swartz - WA6HHQ, Elecraft
Sent: Friday, March 17, 2017 10:06 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in
operation, what features etc would be important?

73,
Eric
/elecraft.com/

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Re: [Elecraft] Linear thoughts

[Carl Yaffey1]

I second that! Plus trade in for my KPA500 and KAT500.
K8NU

> On Mar 17, 2017, at 3:54 PM, Bert Garcia N8NN <n...@earthlink.net> wrote:
> 
> My wish list for a 1500 watt Elecraft linear:
> 
> Separate power supply so I can lift it one piece at a time.
> Light weight power supply.
> Wide-range automatic antenna tuner with memory.
> Quite fans, low noise.
> Solid-state QSK.
> 160 - 6 meters.
> Auto band change by RF sensing.
> Auto band change from the transceiver.
> Power limited on 30/60 meters.
> 11 meters blocked.
> Multiple antenna jacks with auto selection.
> Built-in SWR and watt meters.
> Antenna selection and SWR/watt meters work when amp is off.
> Two radio inputs.
> Elecraft styling.
> Remote control capability via LAN.
> 1500 watts no time limit.
> Auto AC voltage selection on power supply.
> 
> Bert N8NN
> 
> 

Carl Yaffey  K8NU
Recording studio.
cyaffeyno_s...@gmail.com 
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com
http://www.bluesswing.com

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Re: [Elecraft] Linear thoughts

[Dan Baker]

If you develop a internal or external tuner for it, please include a lock
switch. This would allow the tuning solution to be locked in place unlike
the KAT500 manual switch.

Thanks,Dan

-- 
KM6CQ
Dan Baker
www.km6cq.com

Don't sacrifice your hobby
for the right house.
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Re: [Elecraft] Linear thoughts

[Edward R Cole]

Eric (Wayne):

I'm not a potential customer (price/advantage ratio too high for my 
casual HF usage).


But having 1200-1500 at 6m would see a potential market in the 6m-eme 
community for those with ability to pay.  6m-eme is increasing 
quickly in light of low solar cycles being projected (how WAS/DXCC on 
6m is done these days).  I am fortunate to have a 1000w surplus 
Harris TV linear (ch.2) running on 6m, but not all are 
builder-engineers so ready-to-play would attract quite a few (plus 
operating down on HF).


My most recent Elecraft acquisition was the KXPA100 usable by both my 
K3/10 and KX3.  I have the KXAT100 arriving this week.  That is 
adequate for both home and road activity.


If I ever decide that I need HF QRO I will probably build my own 
LDMOS from several kits available in the market.  I still have a 300w 
80-10m CCI linear that sits collecting dust after getting the KXPA100.


Not sure what is available in LDMOS but a dual KXPA750 might find 
good acceptance as one could run 750-1500w.  I have seen this done on 
2m with two 1200w LDMOS run at 750w conservatively to supply a 
combined output of 1500w (but it is not cheap).


I'm going to be roving America during the summer over the new few 
years with my KX3 + KXPA100 (we pick up the trailer in Seattle in May).


73, Ed - KL7UW
  http://www.kl7uw.com
Dubus-NA Business mail:
  dubus...@gmail.com 


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Re: [Elecraft] Linear thoughts

[Clay Autery]

I'm firmly in the component or modular engineering camp.  All things
equal, less integration of function trumps integration if its a choice.

The other guys have already hit on most of the big items...  Here's what
is important to me.

1500+W (Prefer something built to 2-3K Watts capable and then throttled
back...  no running on the bleeding edge.
Clean  Like really clean...
Separate power supply  OR AT MINIMUM, the option to choose to use an
external power supply so I can choose either the one Elecraft supplies
or provide my own  heavy linear at home and the option for a lighter
travel supply.
 (Ideally, a separate Elecraft PS that obeys the packaging rules...
Try to integrate the packaging to fit the K3s, et al footprint... 
Height being the adjustable dimension to meet volume requirements.
Thermal design from the ground up not as an afterthought (patchwork and
band-aids not welcome).

Seriously consider designing in an easily made mod that will allow other
drive profiles for when the current limit is eliminated.

Don't want an internal tuner  want a KAT1500 like external tuner...

Long, long list of considered opinions on almost any conceivable
spec/feature and a logical argument for/against inclusion in the design
Simply ask the questions...

73,

__
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 3/17/2017 12:06 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
> Interesting discussion.
>
> Folks, if we did introduce a 1500 W solid state amp similar to our
> KPA500 in operation, what features etc would be important?
>
> 73,
> Eric
> /elecraft.com/
>
>
> __
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Re: [Elecraft] Linear thoughts

[Scott via Elecraft]

 
As long as we're hoping how about a swappable input board to allow it  to 
be driven to full output by a KX3 as soon as the rule changes. Ditto for the  
KPA500..that's when I'll buy mine.
 
Or at least allow an experimenter to easily modify his own without  voiding 
a warranty if the rule doesn't change
 
Scott ka9p

 
 
In a message dated 3/17/2017 3:01:02 P.M. Central Daylight Time,  
n...@earthlink.net writes:

My wish  list for a 1500 watt Elecraft linear:

Separate power supply so I can  lift it one piece at a time.
Light weight power supply.
Wide-range  automatic antenna tuner with memory.
Quite fans, low noise.
Solid-state  QSK.
160 - 6 meters.
Auto band change by RF sensing.
Auto band change  from the transceiver.
Power limited on 30/60 meters.
11 meters  blocked.
Multiple antenna jacks with auto selection.
Built-in SWR and  watt meters.
Antenna selection and SWR/watt meters work when amp is  off.
Two radio inputs.
Elecraft styling.
Remote control capability  via LAN.
1500 watts no time limit.
Auto AC voltage selection on power  supply.

Bert N8NN


-Original Message-
From:  Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Eric
Swartz  - WA6HHQ, Elecraft
Sent: Friday, March 17, 2017 1:07 PM
To:  elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear  thoughts

Interesting discussion.

Folks, if we did introduce a  1500 W solid state amp similar to our KPA500 
in
operation, what features  etc would be  important?

73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Wes Stewart]

The imaginary transceiver to match the imaginary amplifier.

On 3/17/2017 11:21 AM, Wayne Burdick wrote:

On Mar 17, 2017, at 11:14 AM, Wes Stewart  wrote:


Three times the power, one-third the cost?

Somewhat more seriously: legal limit, internal tuner for up to at least 3:1 SWR 
(option?), optional separate power supply, quieter cooling. Bigger box to match 
K4.

The what?



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Re: [Elecraft] Linear thoughts

[John Fritze]

Dear Eric,

IF Elecraft was to introduce a 1500W amp, I would love it to interface as
well as the KPA500 does now.  If I could have anything additional, my first
choice would be to have a tuner inside the box, that can either be used or
bypassed as necessary.

The ability to be run on either 110V or 220V US, ( and European voltages
).  Ideally a multi-tap transformer that would allow locations with voltage
sag to still operate the amp.  For example on my boat I have a multitap
isolation transformer that allows voltages to be adjusted to 110V from 90V
and up to 250V simply by changing taps.

-- 
John Fritze Jr
K2QY
k...@arrl.net
ACACES president 2014
ARES ENY DEC Northern District
Hudson Div. Asst. Director
Twitter: @k2qy
401 261 4996 (cell)
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Re: [Elecraft] Linear thoughts

[brian]

You forgot antenna tune should follow K3 frequency like KAT500 can so 
that it can pre-tune.

73 de Brian/K3KO

On 3/17/2017 19:54 PM, Bert Garcia N8NN wrote:

My wish list for a 1500 watt Elecraft linear:

Separate power supply so I can lift it one piece at a time.
Light weight power supply.
Wide-range automatic antenna tuner with memory.
Quite fans, low noise.
Solid-state QSK.
160 - 6 meters.
Auto band change by RF sensing.
Auto band change from the transceiver.
Power limited on 30/60 meters.
11 meters blocked.
Multiple antenna jacks with auto selection.
Built-in SWR and watt meters.
Antenna selection and SWR/watt meters work when amp is off.
Two radio inputs.
Elecraft styling.
Remote control capability via LAN.
1500 watts no time limit.
Auto AC voltage selection on power supply.

Bert N8NN


-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Eric
Swartz - WA6HHQ, Elecraft
Sent: Friday, March 17, 2017 1:07 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in
operation, what features etc would be important?

73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Bert Garcia N8NN]

My wish list for a 1500 watt Elecraft linear:

Separate power supply so I can lift it one piece at a time.
Light weight power supply.
Wide-range automatic antenna tuner with memory.
Quite fans, low noise.
Solid-state QSK.
160 - 6 meters.
Auto band change by RF sensing.
Auto band change from the transceiver.
Power limited on 30/60 meters.
11 meters blocked.
Multiple antenna jacks with auto selection.
Built-in SWR and watt meters.
Antenna selection and SWR/watt meters work when amp is off.
Two radio inputs.
Elecraft styling.
Remote control capability via LAN.
1500 watts no time limit.
Auto AC voltage selection on power supply.

Bert N8NN


-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Eric
Swartz - WA6HHQ, Elecraft
Sent: Friday, March 17, 2017 1:07 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in
operation, what features etc would be important?

73,
Eric
/elecraft.com/


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Re: [Elecraft] (Elecraft) Linear thoughts

[Thomas Donohue]

Hi to all:

I had the strong suspicion based on what I heard an Elecraft rep say at last 
years Dayton Hamvention that a 1500W linear was being worked on; so, I was not 
surprised by Eric's request. My input is as follows: (1) 1500W+ output, key 
down; (2) light weight (30 lbs or less); if the 30lbs is not doable in a single 
unit, then the power supply could be put in a separate box; (3) capability to 
support two transceivers, much like the current Yaesu Quadra; and (4) full 
computer control of amp and transceiver(s) I'll leave the detailed suggestions 
to those much more qualified than I to make. Finally, I will purchase one at 
Dayton if it is available, sight unseen, based on the Elecraft history of 
producing high quality products, and most importantly, updating and supporting 
them throughout their life cycle. Thanks Elecraft for all that you do.

Best 73,
Tom/W1QU


Sent from my iPad
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Re: [Elecraft] Linear thoughts

[Mitch Wolfson , DJØQN / K7DX]

Hi Eric,

Thanks for opening up this can of worms ;-)

I haven't been following the discussion until now, but my suggestion 
comes from another angle: make any new amplifier very remotable.


This means the following:
- Have API's that support complete remote control, also available to 
other software and hardware developers
- If possible, allow remote power on via a remote command and not by 
providing a voltage to pins (like the old SPE 1K-FA did)

- Do not use (only) USB control, since this is no good for remoting
- Have a true serial port for serial port servers and other legacy devices
- A bonus would be an embedded serial port server, such as the Lantronix 
XPort (OM Power offers this as an option) 
https://www.lantronix.com/products/xport/
- Another added bonus would be an embedded web server with a control 
interface, such as that offered on the RemoteRig RC-1216H 
http://www.remoterig.com/wp/?page_id=1010


Having helped to install dozens of amplifiers for remoting, I can say 
that this feature set would put a new 1500w amplifier on the top of the 
remote station heap if reasonably priced.


73,
Mitch DJ0QN / K7DX

Mitch Wolfson DJØQN / K7DX
10285 Boca Cir, Naples, FL 34109
Skype: mitchwo
USA: Home:+1-239-221-9600 - Mobile:+1-424-288-9171
Germany: Home:+49 89 32152700 - Mobile:+49 172 8374436

On 17.03.2017 13:06, Eric Swartz - WA6HHQ, Elecraft wrote:

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our 
KPA500 in operation, what features etc would be important?


73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Chris Tate - N6WM]

Some bullet points.  take the best of what is emerging and improve it..


-2 inputs and multiple antenna ports and enough isolation to support SO2R OOB 
with 1 devices.   (flex amp).  less devices, shack simplification and value...

-ability to control device over Ethernet via remote without connecting  via a 
serial interface, but keep the serial interface for legacy use (flex amp) the 
future is on ethernet.

-some kind of ability to manage mismatches, probably a tuner either outboard 
like a kat500 or inboard would be 
better.  one that is more resilient than the expert would be a market 
differentiator(expert amps but needs improvement)  This would make it a killer 
device.

Thats what comes to mind short term.








From: Elecraft [elecraft-boun...@mailman.qth.net] on behalf of Wayne Burdick 
[n...@elecraft.com]
Sent: Friday, March 17, 2017 11:21 AM
To: Wes Stewart
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

On Mar 17, 2017, at 11:14 AM, Wes Stewart <wes_n...@triconet.org> wrote:

> Three times the power, one-third the cost?
>
> Somewhat more seriously: legal limit, internal tuner for up to at least 3:1 
> SWR (option?), optional separate power supply, quieter cooling. Bigger box to 
> match K4.

The what?


>
> Wes  N7WS
>
> On 3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:
>> Interesting discussion.
>>
>> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
>> operation, what features etc would be important?
>>
>> 73,
>> Eric
>> /elecraft.com/



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Re: [Elecraft] Linear thoughts

[Guy Olinger K2AV]

On Fri, Mar 17, 2017 at 2:21 PM, Wayne Burdick  wrote:
> The what?

K4.

Whatever the K3x finally evolves to, plus a front-end that does
brainwave interpretation by a combination brainwave detector,
microphone, headphone, computer display, eye reading device that looks
like an inverted colander.

No keyboard, no key, no knobs, no buttons, just a monitor display to
show you what state everything is in.

G.
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[Elecraft] Linear thoughts

[Chuck Chandler]

Hhhhmmm...

1000W minimum. Excellent performance. Clean signal. Easy interconnection
with K3 (or K4.) Reasonable weight and form factor (power supply in second
box would be OK.) Auto-tuner rated for output and reasonable SWR. Antenna
selection for at least 4 antennas.  Not as expensive as the competition
(or, at least within shouting distance.)

73 de Chuck, WS1L

-- 


===
Chuck Chandler
chandler...@gmail.com
===
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Re: [Elecraft] Linear thoughts

[Kevin - K4VD]

On Fri, Mar 17, 2017 at 2:21 PM, Wayne Burdick  wrote:

> ​T​
> he what?


​He said K4. :)

​
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Re: [Elecraft] Linear thoughts

[Bud Semon]

My thoughts in order of importance to me:

1) 1500 W continuous duty - 100% clean signal.
2) 160 - 6 M
3) QSK - no relays
4) 1 package - no separate power supply
5) Lightweight (this is relative of course)
6) Remotely controllable
7) Internal tuner not required

73, Bud  N7CW

On Fri, Mar 17, 2017 at 10:06 AM, Eric Swartz - WA6HHQ, Elecraft <
e...@elecraft.com> wrote:

> Interesting discussion.
>
> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500
> in operation, what features etc would be important?
>
> 73,
> Eric
> /elecraft.com/
>
>
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Re: [Elecraft] Linear thoughts

[Wayne Burdick]

On Mar 17, 2017, at 11:14 AM, Wes Stewart  wrote:

> Three times the power, one-third the cost?
> 
> Somewhat more seriously: legal limit, internal tuner for up to at least 3:1 
> SWR (option?), optional separate power supply, quieter cooling. Bigger box to 
> match K4.

The what?


> 
> Wes  N7WS
> 
> On 3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:
>> Interesting discussion.
>> 
>> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
>> operation, what features etc would be important?
>> 
>> 73,
>> Eric
>> /elecraft.com/



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Re: [Elecraft] Linear thoughts

[Wes Stewart]

Three times the power, one-third the cost?

Somewhat more seriously: legal limit, internal tuner for up to at least 3:1 SWR 
(option?), optional separate power supply, quieter cooling. Bigger box to match K4.


Wes  N7WS

 On 3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote:

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
operation, what features etc would be important?


73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Mike via Elecraft]

1.  Separate power supply or small control box (ala ACOM 2000A).   Same 
form factor as K line if separate power supply (small control box able to  
control an integral or separate "KAT1500" as well).
2.  Solid state.
3.  Full integration with K line similar to KPA500 and easy  integration 
with other radios including KX3 & KX2.
4.  160-6m.
5.  1500 W.
6.  True SO2R capable with K line and other radios (SPE 1.3K is almost  
there).
7.  Integral antenna tuner or "KAT1500".
8.  Easily user modified to get rid of antiquated 15db gain  limit.
9.  Clean TX throughout entire power range on a par with K3s.
10.  Easily remotable.
11.  QSK with adjustable parameters.
 
Mike KD8RQE
 
 
In a message dated 3/17/2017 1:12:20 P.M. Eastern Daylight Time,  
e...@elecraft.com writes:

Interesting discussion.

Folks, if we did introduce a 1500 W  solid state amp similar to our KPA500 
in 
operation, what features etc  would be  important?

73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Charlie Carroll]

Strongly concur!

Think serious contesting and airline carry-on, weight, weight ..., continuous 
contest operation, prefer solid basic operation over bells and whistles (or 
make bells/whistles an option).

73 charlie k1xx/vp2mmf

On March 17, 2017 1:18:39 PM EDT, Andrew Faber via Elecraft 
<elecraft@mailman.qth.net> wrote:
>Eric,
>Hallelujah!  First acknowledgment of such a possibility!  I vote to put
>a 
>second amp module in the RF Deck (i.e., an RF deck that is the same as
>the 
>total size of the KPA500) and have a separate switching supply in
>another 
>box. 1200-1300 watts would be a sweet spot if 1.5K is a problem.  Shoot
>for 
>30 pounds or under.
>73, andy ae6y (KPA500 ser. 77).
>
>-Original Message- 
>From: Eric Swartz - WA6HHQ, Elecraft
>Sent: Friday, March 17, 2017 10:06 AM
>To: elecraft@mailman.qth.net
>Subject: Re: [Elecraft] Linear thoughts
>
>Interesting discussion.
>
>Folks, if we did introduce a 1500 W solid state amp similar to our
>KPA500 in
>operation, what features etc would be important?
>
>73,
>Eric
>/elecraft.com/
>
>
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-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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Re: [Elecraft] Linear thoughts

[Peter LaBissoniere]

KPA-500 trade-in program.

Sent from my iPhone

> On Mar 17, 2017, at 12:06 PM, Eric Swartz - WA6HHQ, Elecraft 
>  wrote:
> 
> Interesting discussion.
> 
> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
> operation, what features etc would be important?
> 
> 73,
> Eric
> /elecraft.com/
> 
> 
> __
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Re: [Elecraft] Linear thoughts

[Alan. G4GNX]

Also, same facilities as KPA500 and built in KAT1500 tuner.

73,

Alan. G4GNX

-Original Message- 
From: Gerald Manthey

Sent: Friday, March 17, 2017 5:24 PM
To: Eric Swartz - WA6HHQ, Elecraft
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Super quiet fans! Full duty cycle.


On Mar 17, 2017, at 12:06 PM, Eric Swartz - WA6HHQ, Elecraft 
<e...@elecraft.com> wrote:


Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 
in operation, what features etc would be important?


73,
Eric
/elecraft.com/ 


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Re: [Elecraft] Linear thoughts

[Ken K6MR]

“I vote to put a second amp module in the RF Deck…”

And the advantage here is that (according to the KPA500 schematic) the control 
hardware is already in place  :^)

Ken K6MR

From: Andrew Faber via Elecraft<mailto:elecraft@mailman.qth.net>
Sent: Friday, March 17, 2017 10:19 AM
To: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>; Eric Swartz - 
WA6HHQ, Elecraft<mailto:e...@elecraft.com>
Subject: Re: [Elecraft] Linear thoughts

Eric,
Hallelujah!  First acknowledgment of such a possibility!  I vote to put a
second amp module in the RF Deck (i.e., an RF deck that is the same as the
total size of the KPA500) and have a separate switching supply in another
box. 1200-1300 watts would be a sweet spot if 1.5K is a problem.  Shoot for
30 pounds or under.
73, andy ae6y (KPA500 ser. 77).

-Original Message-
From: Eric Swartz - WA6HHQ, Elecraft
Sent: Friday, March 17, 2017 10:06 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in
operation, what features etc would be important?

73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Guy Olinger K2AV]

KPA1500?

QSK. Bombproof. IF possible, amp only in K3 form factor, separate
power supply regulated with sense line from the amplifier module.
KAT1500 with ability to place it remotely, able to place KAT1500
control buttons in an otherwise blank spot on KPA1500 front panel.
KAT1500 with memory per antenna jack per frequency. KPA/KAT
communication via telemetry over coax center conductor.

73, Guy K2AV

On Fri, Mar 17, 2017 at 1:06 PM, Eric Swartz - WA6HHQ, Elecraft
 wrote:
> Interesting discussion.
>
> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in
> operation, what features etc would be important?
>
> 73,
> Eric
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Re: [Elecraft] Linear thoughts

[Gerald Manthey]

Super quiet fans! Full duty cycle. 


> On Mar 17, 2017, at 12:06 PM, Eric Swartz - WA6HHQ, Elecraft 
>  wrote:
> 
> Interesting discussion.
> 
> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
> operation, what features etc would be important?
> 
> 73,
> Eric
> /elecraft.com/
> 
> 
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Re: [Elecraft] Linear thoughts

[Joe K2UF]

Oh boy!  You just broke the e_dam,  now here comes the e_flood.  ;o))

73  Joe K2UF 

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Eric
Swartz - WA6HHQ, Elecraft
Sent: Friday, March 17, 2017 1:07 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in
operation, what features etc would be important?

73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Andrew Faber via Elecraft]

Eric,
Hallelujah!  First acknowledgment of such a possibility!  I vote to put a 
second amp module in the RF Deck (i.e., an RF deck that is the same as the 
total size of the KPA500) and have a separate switching supply in another 
box. 1200-1300 watts would be a sweet spot if 1.5K is a problem.  Shoot for 
30 pounds or under.

73, andy ae6y (KPA500 ser. 77).

-Original Message- 
From: Eric Swartz - WA6HHQ, Elecraft

Sent: Friday, March 17, 2017 10:06 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Linear thoughts

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in
operation, what features etc would be important?

73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Gian Luca Cazzola]

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Re: [Elecraft] Linear thoughts

[w7aqk]

This debate seems to get resurrected a lot.  I think the reason for that is 
more philosophical than technical.  Clearly 1 KW is better than 500 watts, 
at least in many cases.  The question really is, do you actually need it, 
and can you make that leap practically.  Answers to those questions will be 
all over the board.


I run 500 watts because it is practical.  I don't have a 1 ton brick to deal 
with, I didn't have to re-wire my shack, the lights don't dim when I go key 
down, and I don't apparently have RFI problems.  I also only had to give up 
one arm and one leg (not both) to accomplish that financially--the cost/watt 
seems to go up significantly above that.  If all those factors were 
neutralized, I might run 1 KW too!


500 watts is a lot of power!  It gives me 60% of the maximum gain I can 
achieve legally (1 S unit down).  1 S unit is nothing to sneeze at, but I 
find that, usually, if I can hear them I can work them.  More often than 
not, if I have a problem, It is hearing them.  A bigger amp won't solve 
that.  I could probably gain 2 S units or more, both on RX and TX, with 
somewhat better antennas.  Well, that's a problem here too, but not for a 
lot of others.


Invariably the "weak signal" argument is raised, and it's hard to refute. 
However, I really wonder how often that is really solved by a bigger amp. 
They may be weak on your RX, but the reverse might not be true.  I'm just 
asking, not refuting.  It does seem to me, though, that it is more a matter 
of out shouting other stations.  On the other hand, it may be a matter of 
defeating the other person's noise level.  Score 1 for more power.  In fact, 
that may be one of the best arguments for more power.


Anyway, I don't think there is an answer here--just options and 
consequences.  A bigger amp is not a panacea--just an option.  What I think 
I do know, however, is that we tend to run more power than we need, not 
less.  Still, that depends on your philosophy.  A lot of folks have V8's, 
when a V6 is plenty.  Actually, I have a V8, but it just drinks more gas, 
and doesn't get me there any quicker.


Dave W7AQK






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Re: [Elecraft] Linear thoughts

[Eric Swartz - WA6HHQ, Elecraft]

Interesting discussion.

Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 in 
operation, what features etc would be important?


73,
Eric
/elecraft.com/


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Re: [Elecraft] Linear thoughts

[Chris Tate - N6WM]

The expert amps work great with the K-line.  I use a 2kfa for contesting from 
K6LRG and the only equivalent amp I would put it up against is an ACOM 2000.  
It is essentially the Solid state equal of the ACOM but has more capabilities.  
The interface is excellent.  Amongst my colleagues there are a couple of 1.3's 
that are lighter but essentially feature equal with just a bit less power 
output but equally useable with the k-line.

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of 
j...@kk9a.com
Sent: Thursday, March 16, 2017 6:36 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Linear thoughts

I still have not seen the Genius pricing. I'm not sure what ever happened to 
the Acom 1200S.  Many people use the SPE 1.3KW on expeditions, I wonder how 
easy it is to hook it up to the K3S.  The KPA-500 works nicely with the K3S but 
giving up 4.5dBs is considerable, a KPA-1000 would be hard to resist. 

John KK9A

From: Gary K9GS
Thu Mar 16 19:19:38 EDT 2017

I think that the ship has sailed with respect to Elecraft bringing a legal 
limit SS amp to market.

There are a growing number of lightweight legal limit amps already on the 
market.  The FlexRadio Power Genius looks especially promising: 
http://www.flexradio.com/amateur-products/powergenius-xl/

It only weighs 33 pounds.  I saw it in operation at the Orlando HamCation and 
it looked very impressive operating all weekend into a dummy load at a 
conservative 1.5 kw output.

SPE also just announced a 1.5 kw amp..something I'm surprised they did given 
that they already have a 1 kw, 1.3 kw, and a 2kw amp on the market.  I know of 
several people that have the 1 kw amp and use it with their K3 radios and they 
love them.  I've used the big SPE amp in CQWW CW and it worked flawlessly all 
weekend without a hiccup.

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Re: [Elecraft] Linear thoughts

[Morgan Bailey]

I have a 1500 watt alpha sitting in the corner. It is a great amp,
although, I don't like the clunky relays and the fan noise to cool the
tubes. Once in a while I like to not have to use cans to operate, but for
the most part I do use the headphones. After having the Alpha and SB 220,
and TenTec Titan amps the Alpha was the loudest. It is kind of an antique
and it is my only piece of boat anchor equipment that I own. I bought a THP
1.5kfx amp and I have been running it at 500 watts when ever I turn it on.
I can run it at 1k or 3db increase in power and from the other end there is
no change in the rx station report. I run CW 98% of the time. But the amp
is used on SSB for the rag chew on a local level and yes I use an amp to
talk across town on 40 meters just to keep the cursing hog farmers and
drunks from messing with us. It works well for that. People just stay away.
But it also attracts the casual drop by who joins the QSO and is welcome to
stay awhile.

500 watts for the last 3 years has been more than enough. It is easy to
hold a frequency in a contest with that power and it causes no
problems with neighbors. Since I only use balanced antennas, my RFI
problems have disappeared. I can run 1500watts with no problems or lights
going on and off and garage doors opening. It is nice to have some headroom
in an amp and that is what the THP gives me. It just loafs at 500 watts. I
run it on 220v and the panel lights don't even change intensity.

I would vote for a 1k amp by Elecraft but probably would only run it at 750
tops. And No I don't need 6 meters so a 160-10 would be great. After all,
Elecraft came out with the KX2 vs KX3 and did just that, 80-10 no 160 or 6,
and I am just fine with that. So if they made an amp with 160 - 10 then
that would be fine by me. It may be even as simple as saying with the
software that the KPA 500 if the software were to change and state 750
watts 160-10 and 500 on 6, heck I would be even happy with that.

Elecraft stuff just works and I am happy with that. I so want to pull the
trigger on the KX 2 or 3 and it temps me every time I visit the page to see
what new stuff has come out.

In the near future, like right now, SDR radios are going to dominate the
field and I really want to see what Wayne, has cooked up for dealing with
that issue. SO2R is the wave of the future in contesting and K9CT is the
poster boy for the Flex 6700 and Maestro interface when it comes to
contesting. He sold all of his K3/P3 stations and has a full compliment of
Flex. Maybe, if Elecraft made a great interface that would work with the
K3S/N1MM then that is an area that should be explored for SO2R.

Every thing is contingent on market share and perceived value. Face it K3
owners are rather an elite crowd. First we are buying radios, when fully
equipped are nearing the $4k mark and from a cosmetic stand point of view,
they are not pretty on the out side. Utility is everything for us, and
simply the K3 works.

In the end, if Elecraft made a better amp than the KPA 500, I would
probably buy it. Maybe even 2 of them for my station conversion to SO2R.

I know guys that buy 2 KPA500.KTA500 for running SO2R with the Flex
6700/maestro set up. It works well for them. Once I retire, I will probably
do the same and run 2 k3s with them. It is the logical solution for me,
especially since I love the quiet relays/pin diode switching and the almost
silent fans when running hard with the KPA500.

Vy 73,

Morgan Bailey NJ8M



On Thu, Mar 16, 2017 at 2:44 PM, Bill Johnson <k9...@live.com> wrote:

> Erik,  I sold my solid state THP2.5kfx for the same reason of not being
> able to lift it easily.  I bought the KPA500 to replace it.  The difference
> in power isn't all that much to me but I don't contest.  I can make up for
> the power difference easily by improving my antennas.  I am doing so now as
> weather permits.  At least I have a great amp with nearly as much on the
> receiver's S meter on the other end.
>
> 73,
> Bill
> K9YEQ
>
> -Original Message-
> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
> Erik Basilier
> Sent: Thursday, March 16, 2017 2:27 PM
> To: Elecraft@mailman.qth.net
> Subject: [Elecraft] Linear thoughts
>
> I recently sold my legal limit tube amp after a bit of a mental struggle.
> The seller in me finally won after I realized that "if I can't lift it, I
> shouldn't own it". I was tempted to replace it with an ALS-1306, but I
> operate RTTY and in that mode the 1306 wouldn't be good for more output
> than a KPA500. Today I received my (new to me) KPA500. However, in a
> contest someone with 1500 Watts will have a big advantage over my 500 W, so
> the subject of higher power may soon come back to me. With the competion
> today in solid state linears, I have to believe that Electraft will in the
> future offer a bigger linear. To me it would be sad if the new Elecraft