Re: [Elecraft] Amplifier Fan Noise

[turnbull]

Peter,   Ah yes on AM with a squirrel cage blower to cool the pair of tubes    
73 DOUG EI2CN   


Sent from my Samsung Galaxy smartphone.
 Original message From: Peter Alterman  Date: 
02/06/2018  12:08  (GMT+01:00) To: Elecraft@mailman.qth.net Subject: [Elecraft] 
Amplifier Fan Noise 
I have found noise-canceling headphones to be an effective antidote to 
amplifier fan noise. But I must say that I like hearing that fan humming along 
and delivering the RF (though not hour after hour in a contest).  Probably the 
result of a misspent youth beside a homebrew dual 813 linear rack.
73, Peter W2CDO



Sent from my Verizon, Samsung Galaxy smartphone
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[Elecraft] Amplifier Fan Noise

[Peter Alterman]

I have found noise-canceling headphones to be an effective antidote to 
amplifier fan noise. But I must say that I like hearing that fan humming along 
and delivering the RF (though not hour after hour in a contest).  Probably the 
result of a misspent youth beside a homebrew dual 813 linear rack.
73, Peter W2CDO



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Re: [Elecraft] Amplifier

[Jim Brown]

Problems like what Dennis is describing are often caused by failure to 
properly bond together all equipment in the shack, to bond that 
equipment to building ground, and to bond all building grounds together.


That said, the original KIO3 board fails to follow the good engineering 
practice of connecting cable shields to the shielding enclosure at the 
point of entry. This failure is, sadly, widespread in ham radio, 
computers, and consumer gear of all sorts. It is a MAJOR cause of hum, 
buzz, and RFI. It was brought to the attention of the world of pro audio 
by Neil Muncy, W3WJE (SK) in a landmark AES paper in 1994.


Problems caused by this design failure are greatly reduced by the proper 
bonding outlined above, and by the use of ferrite common mode chokes on 
wiring connected to the defective equipment. Proper bonding is described 
in the slides for a talk I've given to several ham conventions. The 
concepts have been incorporated into a new ARRL book on power and 
grounding by N0AX.


http://k9yc.com/GroundingAndAudio.pdf

73, Jim K9YC

On Fri,4/7/2017 12:42 AM, Vic Rosenthal wrote:

Hmm, I am running 1.2+ kW to a dipole on the roof about 20 feet above my K3, 
which has no RF problems though other devices in my shack do!

Vic 4X6GP


On 6 Apr 2017, at 19:28, Dennis Watkins  wrote:

I would suggest that a redesign on the K2/K3s would be a starting point.  The 
cheesy connectors on the back of the k3 will not stand up to a strong field  
from a 1.5kw amp with the tower  mounted to the house. To much leakage for me.


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Re: [Elecraft] Amplifier

[Mike Harris]

I had the opportunity to borrow an R professional field strength meter 
from the local telco when there were concerns over the installation of 
mobile phone towers in town. The worriers obsessed over the towers but 
completely ignored the little transmitters they and their kids would be 
clamping to the side of their brains.


My HF beam is 12.5 metres high on a tower. With 1kW from the amp, 
standing directly at the base of the tower the field strength measured 
was well below the guidlines for RF exposure.


Living at the base of a steep sloping ridge to the south it was easy to 
elevate myself to the plane of the antenna beaming at me from about 35 
to 40 metres. When the TX at 1kW was keyed there was no indicated 
increase in field strength over the background reading. Also duty cycle 
comes into play.


There are a couple of FCC bulletins, OET65 and specifically for radio 
amateurs OET65B which go into a lot of detail on this subject. They are 
dated late 1997 and I've not check to see if there are more recent 
revisions.


Regards,

Mike VP8NO



On 07/04/2017 09:50, Wes Stewart wrote:

I assume you're commenting on the 1KW 20' away, although failed to say
so.  Turn this scenario around: pretend that you were trying to do
medical treatment or research by heating your body to a biologically
significant temperature. How much power to a transducer 20' away would
it take?


On 4/7/2017 3:10 AM, Bill wrote:

That proximity would scare me - I'd feel like I was on a skewer in a
microwave oven.

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Re: [Elecraft] Amplifier

[Edward R Cole]

In the USAmerica ham's now have the *responsibility* of determining 
the safe operating zones for each antenna per FCC regulation.  I 
doubt many ever do the calculation.  Fortunately Australian ham Doug 
MacArthur (sk) VK3UM (a well known eme'r) has written a program which 
you can download for free.  I will simulate the emf fields base on 
your input data like antenna, power, height, band and produces the 
legal exclusion zones where RF exposure is considered dangerous.


http://www.vk3um.com/emr%20calculator.html

Its not hard to use and provides some interesting if not surprising 
info about your station safety.


As I already stated, it is the legal requirement for all US hams to 
have evaluated safe range for humans before operating.


Eg:  half-wave dipole, 1400w, line loss 0.5 dB, 14.2 MHz: exclusion = 
3.06m radially; safe height 2.60m for FCC.  Also provides ARPNSA and 
CEU radiation limits.


73, Ed - KL7uW

Date: Fri, 7 Apr 2017 10:42:32 +0300
From: Vic Rosenthal <k2vco@gmail.com>
To: Elecraft Reflector <elecraft@mailman.qth.net>
Subject: Re: [Elecraft] Amplifier
Message-ID: <8953d40c-305a-4a61-871a-7e6ece3e0...@gmail.com>
Content-Type: text/plain;   charset=us-ascii

Hmm, I am running 1.2+ kW to a dipole on the roof about 20 feet above 
my K3, which has no RF problems though other devices in my shack do!


Vic 4X6GP


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


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Re: [Elecraft] Amplifier

[Wes Stewart]

I assume you're commenting on the 1KW 20' away, although failed to say so.  Turn 
this scenario around: pretend that you were trying to do medical treatment or 
research by heating your body to a biologically significant temperature. How 
much power to a transducer 20' away would it take?



On 4/7/2017 3:10 AM, Bill wrote:
That proximity would scare me - I'd feel like I was on a skewer in a microwave 
oven.




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Re: [Elecraft] Amplifier

[John Dolan]

What Cheesy connectors are you referring to?

WB4YAL John

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

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

On Fri, Apr 7, 2017 at 3:42 AM, Vic Rosenthal  wrote:

> Hmm, I am running 1.2+ kW to a dipole on the roof about 20 feet above my
> K3, which has no RF problems though other devices in my shack do!
>
> Vic 4X6GP
>
> > On 6 Apr 2017, at 19:28, Dennis Watkins  wrote:
> >
> > I would suggest that a redesign on the K2/K3s would be a starting
> point.  The cheesy connectors on the back of the k3 will not stand up to a
> strong field  from a 1.5kw amp with the tower  mounted to the house. To
> much leakage for me.
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Re: [Elecraft] Amplifier

[Bill]

That proximity would scare me - I'd feel like I was on a skewer in a 
microwave oven.


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

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Re: [Elecraft] Amplifier

[Vic Rosenthal]

Hmm, I am running 1.2+ kW to a dipole on the roof about 20 feet above my K3, 
which has no RF problems though other devices in my shack do!

Vic 4X6GP

> On 6 Apr 2017, at 19:28, Dennis Watkins  wrote:
> 
> I would suggest that a redesign on the K2/K3s would be a starting point.  The 
> cheesy connectors on the back of the k3 will not stand up to a strong field  
> from a 1.5kw amp with the tower  mounted to the house. To much leakage for me.
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Re: [Elecraft] Amplifier

[Josh]

Which connectors? What's the anticipated problem? Please explain. Tnx

73
Josh W6XU

Sent from my mobile device

> On Apr 6, 2017, at 9:28 AM, Dennis Watkins  wrote:
> 
> I would suggest that a redesign on the K2/K3s would be a starting point.  The 
> cheesy connectors on the back of the k3 will not stand up to a strong field  
> from a 1.5kw amp with the tower  mounted to the house. To much leakage for me.
> 

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[Elecraft] Amplifier

[Dennis Watkins]

I would suggest that a redesign on the K2/K3s would be a starting 
point.  The cheesy connectors on the back of the k3 will not stand up to 
a strong field  from a 1.5kw amp with the tower  mounted to the house. 
To much leakage for me.

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Re: [Elecraft] Amplifier wishes

[Kjeld Holm]

Agree! 

Vy 73 de OZ1CCM, Kjeld

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Walter
Underwood
Sent: 5. april 2017 22:45
To: Elecraft List
Subject: Re: [Elecraft] Amplifier wishes

That could be handy. The bypass circuit could include a sensor for a lower
range (0.1 to 200W).

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Apr 5, 2017, at 1:38 PM, Doug Hensley <w...@hotmail.com> wrote:
> 
> It might not be possible but I'd like to see one with an on-board watt
meter that can also monitor just the K3 by itself when the amp is turned
off.  I'm not opposed to the requirement that it be turned on to make that
watt meter work but either way, an on-board watt meter & SWR bridge would
simplify watt meter requirements for whole K3 station.
> 
> 
> I enjoy the list.  Cheers,
> 
> 
> Doug W5JV
> 
> 
> 
> 
> 
> 
> 
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> wun...@wunderwood.org

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Re: [Elecraft] Amplifier wishes

[Walter Underwood]

That could be handy. The bypass circuit could include a sensor for a lower 
range (0.1 to 200W).

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Apr 5, 2017, at 1:38 PM, Doug Hensley  wrote:
> 
> It might not be possible but I'd like to see one with an on-board watt meter 
> that can also monitor just the K3 by itself when the amp is turned off.  I'm 
> not opposed to the requirement that it be turned on to make that watt meter 
> work but either way, an on-board watt meter & SWR bridge would simplify watt 
> meter requirements for whole K3 station.
> 
> 
> I enjoy the list.  Cheers,
> 
> 
> Doug W5JV
> 
> 
> 
> 
> 
> 
> 
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Re: [Elecraft] Amplifier wishes

[Doug Hensley]

It might not be possible but I'd like to see one with an on-board watt meter 
that can also monitor just the K3 by itself when the amp is turned off.  I'm 
not opposed to the requirement that it be turned on to make that watt meter 
work but either way, an on-board watt meter & SWR bridge would simplify watt 
meter requirements for whole K3 station.


I enjoy the list.  Cheers,


Doug W5JV







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[Elecraft] Amplifier thought: antenna tuner seldom needed with LDMOS amp

[Dick via Elecraft]

As was posted on the Amps reflector a few months back:
 

> The LDMOS devices are designed to tolerate 65:1 SWR, 3:1 probably

> wouldn't be a problem so where is the need for a tuner?

 
Most ham antennas don't exceed 3 to 1 SWR even on the band  edges.  New 
amps that are constructed with LDMOS finals should be  able to handle nearly 
all antennas without a tuner.  
 
Operating a legal limit amp into an antenna with an SWR greater  than 3 to 
1 should be avoided for many reasons, such  as: poor radiation efficiency, 
harmonics, RF in the shack, RFI,  etc.  
 
73,
Dick- K9OM   
 
 
 
In a message dated 4/1/2017 8:48:28 P.M. Eastern Daylight Time,  
elecraft-requ...@mailman.qth.net writes:

Date:  Sat, 1 Apr 2017 12:03:01 -0500
From: K9MA  <k...@sdellington.us>
To: elecraft@mailman.qth.net
Subject: Re:  [Elecraft] Amplifier Thoughts
Message-ID:  <ecc6e608-42ae-aca5-9313-241a880dc...@sdellington.us>
Content-Type:  text/plain; charset=windows-1252; format=flowed

On 4/1/2017 09:22, John  Perlick wrote:
> In the case of a solid state amp, the output is matched  to 50 Ohms or 
so.  Period.  So any mismatch means that RF is  reflected back into the 
ampwhere it is converted into heat.Depending on your SWR, that could be 
substantial!  So let's say 3:1. Then  25% of the power is reflected.   Note: 
at 10:1 you reflect 67% of  the power so that means 500 W reaches your 
antenna and 1000W is dissipated in  the Drain-Source junctions of your 
expensive 
RF transistors!
Clearly, a  practical solid state amplifier capable of tolerating, say, a 
3:1 SWR  needs an autotuner.  (Very few of us have the luxury of 
perfectly  matched antennas across all bands.)  That said, the autotuner 
should  permit maximum flexibility, including multiple settings for the 
same  band.  There should also be an easy way to change settings, so the  
amplifier can be easily integrated into the station control  system.

73,

Scott   K9MA

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Re: [Elecraft] Amplifier Thoughts

[K9MA]

On 4/1/2017 09:22, John Perlick wrote:

In the case of a solid state amp, the output is matched to 50 Ohms or so.  
Period.  So any mismatch means that RF is reflected back into the ampwhere 
it is converted into heat.   Depending on your SWR, that could be substantial!  
So let's say 3:1. Then 25% of the power is reflected.   Note: at 10:1 you 
reflect 67% of the power so that means 500 W reaches your antenna and 1000W is 
dissipated in the Drain-Source junctions of your expensive RF transistors!
Clearly, a practical solid state amplifier capable of tolerating, say, a 
3:1 SWR needs an autotuner.  (Very few of us have the luxury of 
perfectly matched antennas across all bands.)  That said, the autotuner 
should permit maximum flexibility, including multiple settings for the 
same band.  There should also be an easy way to change settings, so the 
amplifier can be easily integrated into the station control system.


73,

Scott  K9MA


--
Scott  K9MA

k...@sdellington.us

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[Elecraft] Amplifier Thoughts

[John Perlick]

l come
> along over time.
>
> Tried doing the same thing on the Windoze 7-64 box, and Panda AV decided
> it was a virus and sidetracked it, meaning it IS a virus.   That would
> be the installer program.  Has anyone else had this problem?  Just
> curious. I've had other programs trigger Panda to flush them, but
> nothing like this.
>
> Thanks and 73,
>
> matt W6NIA
>
>
>> On 3/27/2017 11:10 AM, Richard Fjeld wrote:
>> Greetings to all,
>>
>> The K3/K3s is an excellent radio for digital modes due to the ease of
>> interfacing with a computer if desired.  A computer is not even needed
>> for some digital modes, and I have tried that successfully.
>>
>> I have mentioned in the past that I had tried the free software for
>> digital voice on HF called 'FreeDV'.  I had worked a Canadian ham a few
>> times using it and he has been keeping in contact with me via email
>> encouraging me to get back into it.  I am starting to get up to date
>> again, and I found accurate reviews of it on
>> http://www.eham.net/reviews/detail/11016   by K2RWF and WA0TPN.  I think
>> you will find the reviews interesting and informative.
>>
>> Notice that the reviews seem to be either at, or near, 5/5 or 0/5. I
>> think both of the reviews I mentioned answer why that is.  I will keep
>> my experience mute and let you glean aye/nay from the reviews. Whether
>> you approve of digital voice or not, the K3/K3s is a natural for using
>> it, and it's fun.  (As always with digital modes, be kind to your finals.)
>>
>> FYI,
>> Dick, n0ce
>>
>>
>
> --
> "A delay is better than a disaster."
> -- unknonwn
>
> Matt Zilmer, W6NIA
> [Shiraz]
>
>
>
> --
>
> Message: 2
> Date: Tue, 28 Mar 2017 18:25:09 -0700
> From: Tom S Bingham <t...@wb7eux.net>
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] K3S and Winlink
> Message-ID: <f38800b3-cc1d-b05e-3d7e-28cea0c11...@wb7eux.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I have installed the Winlink software but I cannot place my K3S into
> transmit when using the Winmor protocol.  The channel selection feature
> changes frequencies on the rig properly.  And, when I place the K3S into
> transmit manually, the modem tones cause ALC to register.
>
> As a side note, Fldigi works fine.  Both Winlink and Fldigi are set to
> the same COMM port and the K3S is in USB mode with under CONFIG:RS232.
> Fldigi is not running when I use the Winlink software.  I use the
> Elecraft supplied KUSB cable between the computer and the K3S.
>
> Can anyone give me a clue?
>
> Thanks!
> Tom
>
> --
> Tom Bingham WB7EUX
> http://www.wb7eux.net/
> SKCC 9833S
> NAQCC 6346
>
>
>
> --
>
> Message: 3
> Date: Wed, 29 Mar 2017 01:38:36 +
> From: Barry <k3...@comcast.net>
> To: t...@wb7eux.net, elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3S and Winlink
> Message-ID: <em420910fa-1f46-4bec-9a78-abdb6c9e97c9@laptop3>
> Content-Type: text/plain; format=flowed; charset=utf-8
>
> Tom,
> I'm not sure which Winlink software you are running, but it should
> work. Check to see that you have VOX on so that when you start to send
> tone the radio goes into transmit. If that is OK, you may need to tell
> your software to use software control for PTT.
>
> 73,
> K3NDM
> Barry
>
> -- Original Message --
> From: "Tom S Bingham" <t...@wb7eux.net>
> To: elecraft@mailman.qth.net
> Sent: 3/28/2017 9:25:09 PM
> Subject: [Elecraft] K3S and Winlink
>
>> I have installed the Winlink software but I cannot place my K3S into
>> transmit when using the Winmor protocol.  The channel selection feature
>> changes frequencies on the rig properly.  And, when I place the K3S
>> into transmit manually, the modem tones cause ALC to register.
>>
>> As a side note, Fldigi works fine.  Both Winlink and Fldigi are set to
>> the same COMM port and the K3S is in USB mode with under CONFIG:RS232.
>> Fldigi is not running when I use the Winlink software.  I use the
>> Elecraft supplied KUSB cable between the computer and the K3S.
>>
>> Can anyone give me a clue?
>>
>> Thanks!
>> Tom
>>
>> -- Tom Bingham WB7EUX
>> http://www.wb7eux.net/
>> SKCC 9833S
>> NAQCC 6346
>>
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Re: [Elecraft] Amplifier

[Michael Walker]

I would like


   - Attractive Price Point
   - 220VAC (given)
   - 1 antenna port
   - full RS232 or TPC/IP remote control
   - Good self protection due to antenna issues.
   - No tuner
   - No multiple antenna ports
   - Good metering for power, current, temp, etc...

In other words, make a great amp, by simple and bullet proof.  Leave the
antenna switching, tuners, etc to other devices.

Keep the price down.  By doing this, it makes it simple to support as a
company and easy to build.

You'll sell more by doing this.

73, Mike va3mw


On Thu, Mar 30, 2017 at 2:42 PM, ab4iqkf4cxo  wrote:

> I personally would like to have a solid state amp capable of 1500 watts.  I
> have an Alpha 9500 and Palstar HF-Auto that works just fine but I enjoy the
> way my KPA500/KAT500 along with the K3S works seamlessly with one another.
> Surely a solid state amp and tuner could replace my present setup with less
> real estate.   I took the time to train my KAT500 with my antennas and
> really works nice.  With my other setup the Palstar has to do its thing
> with
> RF applied and the alpha has to do its thing.  The Alpha takes three
> minutes
> to warm up and the KPA500 instantaneous and has 6 meters as well where the
> Alpha does not.  I'm not degrading the Alpha and Palstar at all because
> they
> do work and quite well.
>
>
>
> Ed.. AB4IQ
>
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[Elecraft] Amplifier

[ab4iqkf4cxo]

I personally would like to have a solid state amp capable of 1500 watts.  I
have an Alpha 9500 and Palstar HF-Auto that works just fine but I enjoy the
way my KPA500/KAT500 along with the K3S works seamlessly with one another.
Surely a solid state amp and tuner could replace my present setup with less
real estate.   I took the time to train my KAT500 with my antennas and
really works nice.  With my other setup the Palstar has to do its thing with
RF applied and the alpha has to do its thing.  The Alpha takes three minutes
to warm up and the KPA500 instantaneous and has 6 meters as well where the
Alpha does not.  I'm not degrading the Alpha and Palstar at all because they
do work and quite well.

 

Ed.. AB4IQ

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Re: [Elecraft] Amplifier thoughts

[Erik Basilier]

Using my KAT500/KPA500 installation, I notice that I avoid using the tuner in 
AUTO mode, because the loud relays distract me when I am tuning around. In 
fact, I tend to disable the KAT500 and turn on the KAT100 in the K3. 

Therefore: A KAT1500 should either have sound absorbent materials built in, or 
else be mounted away from the operating position.

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Re: [Elecraft] Amplifier thoughts

[Ron Wilcox]

Idaho is a great place for our hobby. That is where I got my start in the
80's from Don KA7T. Good luck. I am excited about the chatter the last week
or so about our wishes for an amp. Hope it happens. There have been some
great ideas so far.

Today is a good day to have a Great Day!
73   Ron Wilcox KF7ZN

On Wed, Mar 29, 2017 at 4:07 PM, Rick WA6NHC <wa6...@gmail.com> wrote:

> Or in my case, the use of ladder line (durned HOA infested area) to handle
> the near 20:1 on 160M (better on most other bands) so that the loss is from
> the tuner to the antenna, not the final.
>
> My solution is that I'm moving to a location better suited for antennas,
> far far away in a land called Idaho.  ;-)
>
> Rick wa6nhc
>
>
> On 3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
>
>> An SWR approaching 10:1 means high RF voltages on a coaxial line at the
>> voltage loops and high current flows at the current loops requiring a very
>> heavy-duty transmission line - likely a nitrogen-filled hard line at 1.5 kW
>> or, at the very least, a very heavy Teflon insulated line. In practice, it
>> is usually the voltage breakdown that kills coax.
>>
>> Of course high SWR also means high losses between the amp and the antenna.
>>
>> The power ratings published by coax cable suppliers are based on a low
>> SWR -- typically less than 1.5:1.
>>
>> The bottom line is that going QRO means a more careful design and
>> installation of the entire antenna system.
>>
>> 73, Ron AC7AC
>>
>>
>>
>> -Original Message-
>> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
>> brian
>> Sent: Tuesday, March 28, 2017 4:31 PM
>> To: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] Amplifier thoughts
>>
>> KAT500 handles a much wider SWR range (like to about 10:1).
>>
>> Why do you assume people are lucky enough to have antennas with no more
>> than a 3:1 SWR across the ham bands?
>>
>> Yes, higher SWR's require beefed up components but welcome to the real
>> world.
>>
>> 73 de Brian/K3KO
>>
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>>
>
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Re: [Elecraft] Amplifier thoughts

[Rick WA6NHC]

Or in my case, the use of ladder line (durned HOA infested area) to 
handle the near 20:1 on 160M (better on most other bands) so that the 
loss is from the tuner to the antenna, not the final.


My solution is that I'm moving to a location better suited for antennas, 
far far away in a land called Idaho.  ;-)


Rick wa6nhc


On 3/29/2017 11:47 AM, Ron D'Eau Claire wrote:

An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage 
loops and high current flows at the current loops requiring a very heavy-duty 
transmission line - likely a nitrogen-filled hard line at 1.5 kW or, at the 
very least, a very heavy Teflon insulated line. In practice, it is usually the 
voltage breakdown that kills coax.

Of course high SWR also means high losses between the amp and the antenna.

The power ratings published by coax cable suppliers are based on a low SWR -- 
typically less than 1.5:1.

The bottom line is that going QRO means a more careful design and installation 
of the entire antenna system.

73, Ron AC7AC



-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian
Sent: Tuesday, March 28, 2017 4:31 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts

KAT500 handles a much wider SWR range (like to about 10:1).

Why do you assume people are lucky enough to have antennas with no more than a 
3:1 SWR across the ham bands?

Yes, higher SWR's require beefed up components but welcome to the real world.

73 de Brian/K3KO

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Re: [Elecraft] Amplifier thoughts

[Oliver Dröse]

And please do away with the 15 dB amplification limit for all sales 
outside the USA. Nobody else has that rule in place so we should not 
suffer from it. ;-)


73, Olli

Contest, DX & radio projects: http://www.dh8bqa.de


Am 29.03.2017 um 01:00 schrieb Paul Van Dyke:

Ralph Parker said my list.

1500w output, 160 - 6m.
2 inputs.
4  outputs (Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations.  :-)

Paul. KB9AVO​

On Mar 28, 2017 4:40 PM, "Ralph Parker"  wrote:


I better post this before I'm too late.

I'd like:
All the features of my KPA500, plus
1500w output, 160 - 6m.
2 inputs.
2 outputs (or more. Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations).
(I understand the difficulty of getting high power from the p/s to the
PA.)
I don't expect to carry it around, so weight is not a problem for me.
Expeditions can use the KPA500 :-)

When this amp is available, I'll sell amplifiers Ac and Am and buy one.
I'm keeping my KPA-500!

Ralph, VE7XF

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Re: [Elecraft] Amplifier thoughts

[Ron D'Eau Claire]

Yes, and that's why the SWR measured at the transmitter is lower than the
actual SWR (measured at the antenna) due to the loss in the line. 

My point is that the sort of SWR we might accept at lower powers quickly
becomes impractical at higher powers because of the constraints imposed by
the transmission line. The sort of coaxial line most Hams use, even  the
super low-loss big stuff, simply cannot handle the voltages produced by a
high SWR.

The place to do the matching is at the antenna end of the transmission line.
So how about a weather proofed remote QRO ATU that goes at the antenna end
of the transmission line? As others pointed out such an ATU won't be small
due to the potentially huge voltages and currents involved, it won't be
lightweight and it certainly won't be cheap. 

73, Ron AC7AC

 

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim
Brown
Sent: Wednesday, March 29, 2017 12:11 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts

On Wed,3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
> An SWR approaching 10:1 means high RF voltages on a coaxial line at 
> the voltage loops

Remember that the SWR on a transmission line, and thus the loss in the line,
is determined ENTIRELY by the match between the antenna and the line, NOT
between the line and the transmitter.

The SWR measured at the transmitter is a measure of the difference between
the impedance the transmitter WANTS to drive and the impedance of the load
connected to it. If that INDICATED SWR is high, a solid state transmitter
will "throttle itself back" to protect itself, but that's not LOSS. The
function of an antenna tuner is to make the transmitter happy by giving it a
load that it's designed for, so that it can put out its full power.

For example, a long wire antenna of random length might be nowhere near
50 ohms resistive, so must be transformed to 50 ohms resistive so that the
transmitter can put power into it. Likewise, an antenna perfectly matched to
75 ohm coax or 150 ohm twin lead has no excess loss in the line but needs a
matching network to make the transmitter happy.  My high dipoles (at 100 -
140 ft) are fed with 75 ohm coax to minimize the loss in the line.

73, Jim K9YC

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Re: [Elecraft] Amplifier thoughts

[Jim Brown]

On Wed,3/29/2017 11:47 AM, Ron D'Eau Claire wrote:

An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage 
loops


Remember that the SWR on a transmission line, and thus the loss in the 
line, is determined ENTIRELY by the match between the antenna and the 
line, NOT between the line and the transmitter.


The SWR measured at the transmitter is a measure of the difference 
between the impedance the transmitter WANTS to drive and the impedance 
of the load connected to it. If that INDICATED SWR is high, a solid 
state transmitter will "throttle itself back" to protect itself, but 
that's not LOSS. The function of an antenna tuner is to make the 
transmitter happy by giving it a load that it's designed for, so that it 
can put out its full power.


For example, a long wire antenna of random length might be nowhere near 
50 ohms resistive, so must be transformed to 50 ohms resistive so that 
the transmitter can put power into it. Likewise, an antenna perfectly 
matched to 75 ohm coax or 150 ohm twin lead has no excess loss in the 
line but needs a matching network to make the transmitter happy.  My 
high dipoles (at 100 - 140 ft) are fed with 75 ohm coax to minimize the 
loss in the line.


73, Jim K9YC

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Re: [Elecraft] Amplifier thoughts

[Ron D'Eau Claire]

An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage 
loops and high current flows at the current loops requiring a very heavy-duty 
transmission line - likely a nitrogen-filled hard line at 1.5 kW or, at the 
very least, a very heavy Teflon insulated line. In practice, it is usually the 
voltage breakdown that kills coax.

Of course high SWR also means high losses between the amp and the antenna. 

The power ratings published by coax cable suppliers are based on a low SWR -- 
typically less than 1.5:1.

The bottom line is that going QRO means a more careful design and installation 
of the entire antenna system.  

73, Ron AC7AC



-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian
Sent: Tuesday, March 28, 2017 4:31 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts

KAT500 handles a much wider SWR range (like to about 10:1).

Why do you assume people are lucky enough to have antennas with no more than a 
3:1 SWR across the ham bands?

Yes, higher SWR's require beefed up components but welcome to the real world.

73 de Brian/K3KO

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Re: [Elecraft] Amplifier thoughts

[John Meade W2XS]

I noticed the frequencies shown on the NXP web site for their reference
circuits:

81.36 MHz
230 MHz
87.5 to 108 MHz

and .

27 MHz!

73,  John W2XS



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Re: [Elecraft] Amplifier thoughts

[Arie Kleingeld PA3A]

Who needs three boxes if it has a switching power supply and the amp 
itself has >90% efficiency?

That would be a nice amp in the best Elecraft 'portable' tradition.

This is the only 1.5kW linear I would consider buying as a replacement 
for my good old Commander.


73,
Arie PA3A

Op 29-3-2017 om 18:17 schreef Phil Hystad:

snip>

If this new 1.5 KW linear (if that is the power) becomes a reality, having it 
come in three
separate boxes may make some sense.  Alternatively, like the Icom PW1, have a
control head that sits on the shack desktop and the main unit containing 
everything
else would be on the floor in a dark corner where it belongs (and, where I had 
my
PW1).

< snip




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Re: [Elecraft] Amplifier thoughts

[Doug Smith]

I cast my ballot for NO internal coupler.  

1) An internal coupler is NOT needed by many who would rather not pay for 
something they don’t need.  Sure, it could be optional but see points 2 and 3.

2) An internal coupler at 1.5 KW as anything beyond a trivial “line flattener” 
will be large.  If the matching range is extended to the 10 : 1 SWR range then 
the components will be *quite* large.  Feeding 1.5 KW into a 5 ohm load with an 
L-Network will require an inductor about the size of a K3S if any sort of Q is 
expected.

3) There exist RF transistors that are built to withstand high power operation 
with really high SWR values.  For example:

http://www.nxp.com/products/rf/rf-power-transistors/rf-broadcast-and-ism/1-600-mhz-broadcast-and-ism/1500-w-cw-over-1.8-500-mhz-50-v-wideband-rf-power-ldmos-transistor:MRF1K50H
 


Surely with such a device (or, better yet, a pair), a 3 : 1 SWR can be 
accommodated with no coupler at all.  Thus, no line flattener needed.

If someone is trying to feed a 43 foot vertical on all bands at 1.5 KW then the 
coupler really should be at the antenna site, not in the shack.  That antenna 
presents a load of about 5 ohms -J500 and the coupler will have to be large at 
1.5 KW.  (This is RF, not DC.  In a high pass L-Net think 18 amps and 9000 peak 
volts with a staggering 600 watts of losses generating heat in that coil.)

As to the amp itself my wish list would include:

1) 1.5 KW ICAS.  (I would accept 1.3 KW but, hey, it’s a wish list.)  Must be 
contest capable, including those crazy RTTY guys.   ;-)

2) Separate light weight power supply.

3) QSK at reasonable speeds.  At least 40 WPM.

4) Multiple antenna outputs, remembered per band; overridable.

5) FULLY integrated with the K3S.  Given proper antenna loads the K3S + KPA1500 
becomes a 1.5 KW transceiver.

6) A remote console setup would be cool.  That way the amp would be just a 
power block that could be set aside, out of the way.  Or, even operated at a 
remote site from the console.  TCP/IP connectivity for the console to power 
block.  

73,
Doug, W7KF
http://www.w7kf.com 


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Re: [Elecraft] Amplifier thoughts

[Phil Hystad]

I used to own the 1 KW Icom PW1 linear amplifier.  It included within its huge 
& heavy
black box the switching power supply and the 3:1 antenna auto-tuner.  I sold 
that
amplifier because my eyes sparkled in delight with a much, much smaller desktop
KPA500 from Elecraft.

If this new 1.5 KW linear (if that is the power) becomes a reality, having it 
come in three
separate boxes may make some sense.  Alternatively, like the Icom PW1, have a
control head that sits on the shack desktop and the main unit containing 
everything
else would be on the floor in a dark corner where it belongs (and, where I had 
my
PW1).

But, being honest, I will not be in the market for a larger amp as 100 watts 
seems
quite a bit for my operations which is 99 percent CW and QRP ops or even 10-watt
QRP ops with my KX2 is a lot of fun.

73, phil, K7PEH



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Re: [Elecraft] Amplifier thoughts

[David Bunte]

John -

I used to live in the world you do... but I now live in a neighborhood
where I can't put up a tower, or even a multiband dipole. My 30' Flag Pole
is OK, and, in fact, my neighbors think it is quite nice looking, but in
order to use it on more than the one band where its unmatched SWR is less
than 3:1, I must use a tuner.

I don't expect to be in the market for an amp that is more capable than my
KPA500, but my guess is that an optional, internal tuner capable of
handling 1500 watts into a 3:1 or lower SWR, would suite quite a few
potential users quite well. That way, someone like you, who does not need a
tuner at all could opt to not order that option.

If Elecraft chooses to market an external tuner capable of handling 1500
watts into a 10:1 SWR, then I hope it is one that could be placed out at
the antenna, and controlled remotely. For some folks, putting such a tuner
in the shack, but out of sight would be equally appealing.

Dave - K9FN

On Wed, Mar 29, 2017 at 7:48 AM, j...@kk9a.com  wrote:

> I guess we live in different worlds. My 10m-20m beams have an SWR <1.2:1
> anywhere in the band. I designed them this way and no luck is involved.
> the SWR is a little higher at the top of the band on my lower band
> antennas but certainly not in the 3:1+ range you are referring to. A 1kw+
> Elecraft solid state amp that could tolerate 2:1 or 2.5:1 with no foldback
> would be so awesome!
>
> John KK9A
>
>
> from: brian alsopb
> Tue Mar 28 19:30:31 EDT 2017
>
> KAT500 handles a much wider SWR range (like to about 10:1).
>
> Why do you assume people are lucky enough to have antennas with no more
> than a 3:1 SWR across the ham bands?
>
> Yes, higher SWR's require beefed up components but welcome to the real
> world.
>
> 73 de Brian/K3KO
>
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[Elecraft] Amplifier thoughts

[j...@kk9a.com]

I guess we live in different worlds. My 10m-20m beams have an SWR <1.2:1
anywhere in the band. I designed them this way and no luck is involved.
the SWR is a little higher at the top of the band on my lower band
antennas but certainly not in the 3:1+ range you are referring to. A 1kw+
Elecraft solid state amp that could tolerate 2:1 or 2.5:1 with no foldback
would be so awesome!

John KK9A


from: brian alsopb
Tue Mar 28 19:30:31 EDT 2017

KAT500 handles a much wider SWR range (like to about 10:1).

Why do you assume people are lucky enough to have antennas with no more
than a 3:1 SWR across the ham bands?

Yes, higher SWR's require beefed up components but welcome to the real
world.

73 de Brian/K3KO

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Re: [Elecraft] Amplifier thoughts

[Chris Tate - N6WM]

Perhaps an installable option would satisfy all...  

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John 
Marvin
Sent: Tuesday, March 28, 2017 9:12 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts

Put me down as a vote against a built-in antenna tuner. I prefer a separate 
external tuner that integrates well with the amplifier. It allows for a lot 
more configuration flexibility.

73
John
AC0ZG

On 3/28/2017 5:00 PM, Paul Van Dyke wrote:
> Ralph Parker said my list.
>
> 1500w output, 160 - 6m.
> 2 inputs.
> 4  outputs (Manual switching is OK).
> Built-in antenna tuner (good for 3:1 SWR).
> Reasonably quiet fans.
> Separate p/s, or remote control head (space considerations.  :-)
>
> Paul. KB9AVO​
>
> On Mar 28, 2017 4:40 PM, "Ralph Parker" <ve...@shaw.ca> wrote:
>
>> I better post this before I'm too late.
>>
>> I'd like:
>> All the features of my KPA500, plus
>> 1500w output, 160 - 6m.
>> 2 inputs.
>> 2 outputs (or more. Manual switching is OK).
>> Built-in antenna tuner (good for 3:1 SWR).
>> Reasonably quiet fans.
>> Separate p/s, or remote control head (space considerations).
>> (I understand the difficulty of getting high power from the p/s 
>> to the
>> PA.)
>> I don't expect to carry it around, so weight is not a problem for me.
>> Expeditions can use the KPA500 :-)
>>
>> When this amp is available, I'll sell amplifiers Ac and Am and buy one.
>> I'm keeping my KPA-500!
>>
>> Ralph, VE7XF
>>
>> __
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> jm...@themarvins.org

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Re: [Elecraft] Amplifier thoughts

[John Marvin]

Put me down as a vote against a built-in antenna tuner. I prefer a 
separate external tuner that integrates well with the amplifier. It 
allows for a lot more configuration flexibility.


73
John
AC0ZG

On 3/28/2017 5:00 PM, Paul Van Dyke wrote:

Ralph Parker said my list.

1500w output, 160 - 6m.
2 inputs.
4  outputs (Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations.  :-)

Paul. KB9AVO​

On Mar 28, 2017 4:40 PM, "Ralph Parker"  wrote:


I better post this before I'm too late.

I'd like:
All the features of my KPA500, plus
1500w output, 160 - 6m.
2 inputs.
2 outputs (or more. Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations).
(I understand the difficulty of getting high power from the p/s to the
PA.)
I don't expect to carry it around, so weight is not a problem for me.
Expeditions can use the KPA500 :-)

When this amp is available, I'll sell amplifiers Ac and Am and buy one.
I'm keeping my KPA-500!

Ralph, VE7XF

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Re: [Elecraft] Amplifier thoughts

[Matthew Cook]

You can always use impedance transformers to bring your match back within
the "impedance range" of your tuner.   These cost far less per unit price
than the components required to beef up an internal tuner to handle
impedance's of 500-800 ohms or more (or the conjugate) with a solid state
amp.

A simple 3:1 impedance transformation is not expensive in terms of
components and allows you to flatten out the band edges of a dipole or
beam.  Out side of this your amplifier is asking you to pay attention.

For those wanting to use antenna with high impedance (or very low
impedance) feed point there are tuners already that will suit your purpose.
  Thinking about that it would be nice if the KAT1500 could have some form
of tuner interface (like the Icom and Kenwoods) where an external tuner can
be activated, RF applied and held until the tuner releases the tune line.

In the real world as you put it capacitors look like door knobs and
inductors are large enough to stand in and everything is silver plated.
There's that pesky issue with the voltage being the square of the current
for a fixed impedance, it does take long for things to get nasty as you
increase the current by 1 or 2 amps at a time.

73

Matthew
VK5ZM

On 29 March 2017 at 10:00, brian  wrote:

> KAT500 handles a much wider SWR range (like to about 10:1).
>
> Why do you assume people are lucky enough to have antennas with no more
> than a 3:1 SWR across the ham bands?
>
> Yes, higher SWR's require beefed up components but welcome to the real
> world.
>
> 73 de Brian/K3KO
>
>
> On 3/28/2017 23:00 PM, Paul Van Dyke wrote:
>
>> Ralph Parker said my list.
>>
>> 1500w output, 160 - 6m.
>> 2 inputs.
>> 4  outputs (Manual switching is OK).
>> Built-in antenna tuner (good for 3:1 SWR).
>> Reasonably quiet fans.
>> Separate p/s, or remote control head (space considerations.  :-)
>>
>> Paul. KB9AVO​
>>
>> On Mar 28, 2017 4:40 PM, "Ralph Parker"  wrote:
>>
>> I better post this before I'm too late.
>>>
>>> I'd like:
>>> All the features of my KPA500, plus
>>> 1500w output, 160 - 6m.
>>> 2 inputs.
>>> 2 outputs (or more. Manual switching is OK).
>>> Built-in antenna tuner (good for 3:1 SWR).
>>> Reasonably quiet fans.
>>> Separate p/s, or remote control head (space considerations).
>>> (I understand the difficulty of getting high power from the p/s to
>>> the
>>> PA.)
>>> I don't expect to carry it around, so weight is not a problem for me.
>>> Expeditions can use the KPA500 :-)
>>>
>>> When this amp is available, I'll sell amplifiers Ac and Am and buy one.
>>> I'm keeping my KPA-500!
>>>
>>> Ralph, VE7XF
>>>
>>> __
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Elecraft@mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to pvandyke1...@gmail.com
>>>
>>> __
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Re: [Elecraft] Amplifier thoughts

[Dave AD6A]

I'd prefer to see the mythical KPA1500 support both a matching KAT1500 (same 
desk footprint as the amp, so it can sit underneath it neatly), as well as a 
new fully-weatherized remote tuner product (call it KART1500?) that can sit 
right at the antenna feedpoint.
VSWR tuning range for both should be 10:1 to 1:1 with no tuning gaps or 
compromises (I really don't mind paying the extra to achieve this). 

I'd like the KPA1500 to have full on/off switching on the front panel, and USB 
rather than D-sub connectors on the rear panel.
At least TWO selectable radio source inputs and THREE selectable antenna output 
ports. 

While we're on wish lists, I'd LOVE to see Elecraft produce a VHF/UHF/Microwave 
radio that looks and operates almost like the K3s with 144MHz, 220MHz, 440MHz, 
1296MHz, 2400MHz, etc. (maybe optional modules on the upper bands). Separate 
antenna ports per band, 100W TX (maybe a bit less on the upper bands), 
all-mode, alpha-numeric labels for memories (a la Yaesu FTM-400XDR), click-mode 
main tuning dial selectable (like IC-7000), and a super-fast scan feature.

Don't want much, do I? ;)

Cheers es 73,
Dave AD6A

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian
Sent: Tuesday, March 28, 2017 4:31 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier thoughts

KAT500 handles a much wider SWR range (like to about 10:1).

Why do you assume people are lucky enough to have antennas with no more than a 
3:1 SWR across the ham bands?

Yes, higher SWR's require beefed up components but welcome to the real world.

73 de Brian/K3KO

On 3/28/2017 23:00 PM, Paul Van Dyke wrote:
> Ralph Parker said my list.
>
> 1500w output, 160 - 6m.
> 2 inputs.
> 4  outputs (Manual switching is OK).
> Built-in antenna tuner (good for 3:1 SWR).
> Reasonably quiet fans.
> Separate p/s, or remote control head (space considerations.  :-)
>
> Paul. KB9AVO​
>
> On Mar 28, 2017 4:40 PM, "Ralph Parker" <ve...@shaw.ca> wrote:
>
>> I better post this before I'm too late.
>>
>> I'd like:
>> All the features of my KPA500, plus
>> 1500w output, 160 - 6m.
>> 2 inputs.
>> 2 outputs (or more. Manual switching is OK).
>> Built-in antenna tuner (good for 3:1 SWR).
>> Reasonably quiet fans.
>> Separate p/s, or remote control head (space considerations).
>> (I understand the difficulty of getting high power from the p/s 
>> to the
>> PA.)
>> I don't expect to carry it around, so weight is not a problem for me.
>> Expeditions can use the KPA500 :-)
>>
>> When this amp is available, I'll sell amplifiers Ac and Am and buy one.
>> I'm keeping my KPA-500!
>>
>> Ralph, VE7XF
>>
>> __
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>>
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>> email list: http://www.qsl.net/donate.html Message delivered to 
>> pvandyke1...@gmail.com
>>
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Re: [Elecraft] Amplifier thoughts

[brian]

KAT500 handles a much wider SWR range (like to about 10:1).

Why do you assume people are lucky enough to have antennas with no more 
than a 3:1 SWR across the ham bands?


Yes, higher SWR's require beefed up components but welcome to the real 
world.


73 de Brian/K3KO

On 3/28/2017 23:00 PM, Paul Van Dyke wrote:

Ralph Parker said my list.

1500w output, 160 - 6m.
2 inputs.
4  outputs (Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations.  :-)

Paul. KB9AVO​

On Mar 28, 2017 4:40 PM, "Ralph Parker"  wrote:


I better post this before I'm too late.

I'd like:
All the features of my KPA500, plus
1500w output, 160 - 6m.
2 inputs.
2 outputs (or more. Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations).
(I understand the difficulty of getting high power from the p/s to the
PA.)
I don't expect to carry it around, so weight is not a problem for me.
Expeditions can use the KPA500 :-)

When this amp is available, I'll sell amplifiers Ac and Am and buy one.
I'm keeping my KPA-500!

Ralph, VE7XF

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[Elecraft] Amplifier thoughts

[Paul Van Dyke]

Ralph Parker said my list.

1500w output, 160 - 6m.
2 inputs.
4  outputs (Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations.  :-)

Paul. KB9AVO​

On Mar 28, 2017 4:40 PM, "Ralph Parker"  wrote:

> I better post this before I'm too late.
>
> I'd like:
> All the features of my KPA500, plus
> 1500w output, 160 - 6m.
> 2 inputs.
> 2 outputs (or more. Manual switching is OK).
> Built-in antenna tuner (good for 3:1 SWR).
> Reasonably quiet fans.
> Separate p/s, or remote control head (space considerations).
>(I understand the difficulty of getting high power from the p/s to the
> PA.)
> I don't expect to carry it around, so weight is not a problem for me.
> Expeditions can use the KPA500 :-)
>
> When this amp is available, I'll sell amplifiers Ac and Am and buy one.
> I'm keeping my KPA-500!
>
> Ralph, VE7XF
>
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Re: [Elecraft] Amplifier thoughts

[Ralph Parker]

I better post this before I'm too late.

I'd like:
All the features of my KPA500, plus
1500w output, 160 - 6m.
2 inputs.
2 outputs (or more. Manual switching is OK).
Built-in antenna tuner (good for 3:1 SWR).
Reasonably quiet fans.
Separate p/s, or remote control head (space considerations).
   (I understand the difficulty of getting high power from the p/s to 
the PA.)
I don't expect to carry it around, so weight is not a problem for me. 
Expeditions can use the KPA500 :-)


When this amp is available, I'll sell amplifiers Ac and Am and buy one. 
I'm keeping my KPA-500!


Ralph, VE7XF

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[Elecraft] Amplifier help?

[Jerry]

Well after waiting almost 4 months it seems the US distributor that I ordered 
my 2k-fa amp from has gone qrt, permanently (Expert Amps USA). I chose them 
over the other US distributor because I though they looked more stable. Bad 
choice but it brought me to the realization of the dangers when dealing with '1 
horse' companies. SPE in Italy appears to be the real deal but these two (now 
one) US distributors give me a less than warm & fuzzy. So as much as I really 
wanted the 2k-fa, I'm now in the market for an amp compatible with the k3s.

What I want in an amp (or as much of it as I can get):
160-6 coverage
Auto antenna tuner
Auto operation when connected to the k3s so I can operate the rig remotely and 
only have to worry about monitoring the amp (it will automatically follow the 
transmitter, select the appropriate antenna and tune itself.
Full legal limit + rated so I can operate with 'headroom' to spare.

That's pretty much what the 2k-fa offered but I haven't been able to find a 
similar amp. The OM looks close. . .

Any suggestions?
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[Elecraft] amplifier

[Dennis Watkins]

Is it possible to drive an alpha amp using antenna 2 output.  This is 
without changing any of the rear panel wiring??


Dennis  W7JX
K3 # 3901
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[Elecraft] Amplifier keying line delay setting

[Howard Sherer]

It appears that the amplifier keying line is always set to operate as 
QSK with
no delay. This keying signal dose not follow the delay that is set for 
the VOX
on CW. The only way that I have found to keep the keying line closed is 
to put
the KX3 into xmit with the front panel button.

Will an adjustable delay for the amplifier keying signal be added in the 
future?

Howard AE3T
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Re: [Elecraft] Amplifier keying line delay setting

[Rick Stealey]

In cw mode:
Make sure QSK is not on.
Make sure VOX is on.
Push in and hold the speed control till CW n.nn appears.
Rotate the speed control to set the drop out time you want.
Anything up to 2 seconds can be set.

Let us know if this doesn't work for you.

Rick  K2XT



 It appears that the amplifier keying line is always set to operate as 
 QSK with
 no delay. This keying signal dose not follow the delay that is set for 
 the VOX
 on CW. 


  
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Re: [Elecraft] Amplifier keying line delay setting

[Howard Sherer]

The CW delay is not the issue but the delay fore the amplifier keyeng 
circuit. It is always set for QSK and dose not follow the delay that is 
set for the CW break in.

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Re: [Elecraft] Amplifier keying line delay setting

[Don Wilhelm]

Howard,

Read the manual carefully - it says that the delay is the time for the 
receiver to *unmute* - it does not claim to extend the Keyout time.

Now, having said that, there is nothing wrong with appealing to Wayne 
and other designers to have it also apply to the Keyout timing.

73,
Don W3FPR
On 7/3/2012 4:57 PM, Howard Sherer wrote:
 The CW delay is not the issue but the delay fore the amplifier keyeng
 circuit. It is always set for QSK and dose not follow the delay that is
 set for the CW break in.

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[Elecraft] Amplifier Ins and Outs

[David Perrin]

Hi-
 Am parting with my old amp to make way for the KPA-500.
 Selling BW PT-2500A workhorse 160-10 Meters amp with WARC bands capability. 
Uses a pair of RF Parts 3-500ZG tubes, has original box and manual. Non smoking 
environment. Not a scratch. 
 Seldom used (CW only) so I don't expect to miss the power I will give up.
 $995 in NH, or will take to a UPS shipping store for them to pack and ship at 
your convenience and cost.
 Please reply off the list, thanks.
 73 de Dave in NH,  K1OPQ
   d...@tds.net
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[Elecraft] Amplifier Suggestions

[Frank MacDonell]

I have a K3/10 and live in a CCR environment. Presently  I  have a  homebrew
dipole (66 feet of stranded copper) in the attic. It works quite well but I
would like to have more reach with CW. I am also concerned about getting RFI
into the neighbor's speakers. I would like to consider a smaller amplifier
compatible with the K3. Does anyone have suggestions? Thanks in advance!

-- 
Frank KD8FIP
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Re: [Elecraft] Amplifier Suggestions

[Mike WA8BXN]

I would add the Elecraft amplifier designed for the K3 to upgrade to a
K3/100. There aren't a lot of choices for amps that are designed for 10
watts in. You could go with any linear designed for higher power and just
get less out driving with 10 watts. 
 
73 - Mike WA8BXN 
 
 
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Re: [Elecraft] Amplifier Suggestions

[Lou Kolb]

This is a great suggestion.  Once you have the 100 watt amp that is meant 
for the K3, you can always set your power for anything between 10 and 100 
watts and you'll use no extra space on the desk, if that matters.  It would 
in my shack.  73,  Lou WA3MIX
- Original Message - 
From: Mike WA8BXN hubb...@hotmail.com
To: elecraft@mailman.qth.net; Frank MacDonell kd8...@gmail.com
Sent: Saturday, April 16, 2011 10:48 AM
Subject: Re: [Elecraft] Amplifier Suggestions


I would add the Elecraft amplifier designed for the K3 to upgrade to a
 K3/100. There aren't a lot of choices for amps that are designed for 10
 watts in. You could go with any linear designed for higher power and just
 get less out driving with 10 watts.

 73 - Mike WA8BXN


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[Elecraft] Amplifier Suggestions

[David Yarnes]

Frank and All,

There are some very good small amps out there.  Tokyo Hy-Power now offers an 
HL-45 that will run about 50 watts or so, and is a very good product.  I 
have their older version, the HL-50B, and it is a superb product as well. 
It is particularly useful with the numerous little QRP rigs I have around 
the shack when conditions just aren't that great for 5 watts or less. 
Another good product is the HF Packer amp, which has been upgraded to quite 
a nice package.

Problem is, these add-on amps are cumbersome, unless you plan to use them 
with several different rigs like I do.  Also, they aren't cheap, even if you 
find one that is used.

If you are just planning to use one with your K3/10, I'd very strongly 
suggest you bite the bullet and just add the Elecraft amp module.  It's 
probably even pricier than the alternatives mentioned above, but the 
convenience factor looms large.  It fits neatly inside your K3, doesn't 
necessitate a bunch of extra connecting cables, interfaces very nicely with 
your K3's firmware, etc.  Then you would have a fully controllable amp, all 
in one package, that you can simply dial up the power you want.  This is a 
lot more convenient than you might think, and especially if you realize that 
more often than not, you don't really need to go all the way to 100 watts, 
or even close to that, to improve your ability to communicate in tougher 
conditions.  50 watts or less may be all you really need, and you wouldn't 
get much more than that anyway out of the others mentioned above.  When 10 
watts or less is sufficient, you simply dial that up, and the amp module is 
effectively disengaged.  In my view, this is absolutely your best option, 
provided you can swing the cost issue.

If cost is a significant issue, there is one other type out there I'm 
familiar with, and frequently I see them offered for a much lower price 
(used).  These are the ones from RM Italy.  I have an HLA-150, and it is a 
pretty good amp--actually will run more than 100 watts.  It's also auto band 
switching.  If you get one of the HLA series, they do have proper bandpass 
filtering.  Other models apparently don't.  My biggest problem with this amp 
is that it's RF sensing capability isn't great--not like the Tokyo Hy-Power 
models.  So, you really need to key it directly, which is a problem with 
most of the little QRP rigs I have, since they don't have a keying line. 
Thus, this amp tends to clip dits and dahs here and there unless you do 
hardwire the keying.  Anyway, I've seen these being sold for something 
around a dollar a watt or so--a good bit cheaper than the others I 
mentioned.  There are also some concerns about this amp's purity when run up 
around it's stated capability.  At 100 watts or less, however, it seems to 
be acceptable.  W8JI did some extensive testing on this, and you might want 
to check out his comments if you are interested.

Bottom line--get the Elecraft amp module if at all possible.  In the long 
run, you won't regret it.

Dave W7AQK


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[Elecraft] New Elecraft Amplifier

[Ron Gould]

Will the new 900 watt amplifier require any connections to the radio other than 
a coax cable and if so then is it supplied and how long will it be?  I 
currently use an amp that has to be keyed and am curious as my amp is not real 
close to the radio and I am considering the new amp.  My current amp uses a 
tube and is a Drake L75.  I was also wondering when I can order the new tuner 
to go with the radio and amp?  PS I have never soldered naked and do not plan 
to change my current lifestyle.

73's  Ron
kd...@comcast.net


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Re: [Elecraft] New Elecraft Amplifier

[Dick Dievendorff]

Ron:

The KPA500 also requires an amplifier key line, which is a standard audio
item, a cable with an RCA phono plug on each end.  I don't know if one will
be supplied.

The KPA500 is a 500 watt amplifier.

I just don't know the answers to your other questions.

And after reading recent forum notes, my naked soldering days are over!

73 de Dick, K6KR


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron Gould
Sent: Tuesday, December 21, 2010 7:35 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] New Elecraft Amplifier

Will the new 900 watt amplifier require any connections to the radio other
than a coax cable and if so then is it supplied and how long will it be?  I
currently use an amp that has to be keyed and am curious as my amp is not
real close to the radio and I am considering the new amp.  My current amp
uses a tube and is a Drake L75.  I was also wondering when I can order the
new tuner to go with the radio and amp?  PS I have never soldered naked and
do not plan to change my current lifestyle.

73's  Ron
kd...@comcast.net


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Re: [Elecraft] New Elecraft Amplifier

[Ron Gould]

Thanks for the information and sorry for confusion about the 900 watt amp.  It 
was a typepo
and I realize its a 500 rated amp.

73's  Ron
kd...@comcast.net


On Dec 21, 2010, at 7:58 AM, Dick Dievendorff wrote:

 Ron:
 
 The KPA500 also requires an amplifier key line, which is a standard audio
 item, a cable with an RCA phono plug on each end.  I don't know if one will
 be supplied.
 
 The KPA500 is a 500 watt amplifier.
 
 I just don't know the answers to your other questions.
 
 And after reading recent forum notes, my naked soldering days are over!
 
 73 de Dick, K6KR
 
 
 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron Gould
 Sent: Tuesday, December 21, 2010 7:35 AM
 To: elecraft@mailman.qth.net
 Subject: [Elecraft] New Elecraft Amplifier
 
 Will the new 900 watt amplifier require any connections to the radio other
 than a coax cable and if so then is it supplied and how long will it be?  I
 currently use an amp that has to be keyed and am curious as my amp is not
 real close to the radio and I am considering the new amp.  My current amp
 uses a tube and is a Drake L75.  I was also wondering when I can order the
 new tuner to go with the radio and amp?  PS I have never soldered naked and
 do not plan to change my current lifestyle.
 
 73's  Ron
 kd...@comcast.net
 
 
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Re: [Elecraft] New Elecraft Amplifier

[Claude Du Berger]

What will be the usable power on RTTY?
73, Claude VE2FK

  - Original Message - 
  From: Dick Dievendorff 
  To: 'Ron Gould' ; elecraft@mailman.qth.net 
  Sent: Tuesday, December 21, 2010 10:58 AM
  Subject: Re: [Elecraft] New Elecraft Amplifier


  Ron:

  The KPA500 also requires an amplifier key line, which is a standard audio
  item, a cable with an RCA phono plug on each end.  I don't know if one will
  be supplied.

  The KPA500 is a 500 watt amplifier.

  I just don't know the answers to your other questions.

  And after reading recent forum notes, my naked soldering days are over!

  73 de Dick, K6KR

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Re: [Elecraft] Elecraft Amplifier

[Terry Schieler]

Phil,

Anyone who has just spent 5 weeks cruising through Europe then rubs our
noses in it on this reflector probably doesn't DESERVE an amplifier.  ;o)

Terry, W0FM





-Original Message-
From: Phil LaMarche [mailto:plama...@verizon.net] 
Sent: Wednesday, November 10, 2010 4:25 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Elecraft Amplifier

I've been off the reflector for 5 weeks on a cruise in Europe.  Has there
been any announcement for anticipated delivery.  Thanks
 
Phil
 
Philip LaMarche
 
LaMarche Enterprises, Inc
p...@lamarcheenterprises.com
www.LaMarcheEnterprises.com http://www.lamarcheenterprises.com/  
 
727-944-3226
727-937-8834 Fax
727-510-5038 Cell 
 
www.w9dvm.com http://www.w9dvm.com/ 
 
K3 #1605
 
CCA 98-00827
CRA 1701
W9DVM
 
 


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Re: [Elecraft] Elecraft Amplifier

[Eric Swartz - WA6HHQ, Elecraft]

This is a totally inappropriate posting for the reflector and is outside 
of the list guidelines.

It is never appropriate to make rude and directly critical postings 
about another list member.

Please see the list guidelines at:
http://www.elecraft.com/elecraft_list_guidelines.htm

73,
Eric  WA6HHQ
Elecraft List Moderator



On 11/11/2010 7:41 AM, Terry Schieler wrote:
 Phil,

 Anyone who has just spent 5 weeks cruising through Europe then rubs our
 noses in it on this reflector probably doesn't DESERVE an amplifier.  ;o)

 Terry, W0FM

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Re: [Elecraft] Elecraft Amplifier

[Terry Schieler]

Sorry Eric.  It was meant in fun.  Phil and I have known each other for some
time now.  He got the humor.  I apologize if it did not come across as
intended.  Hence the ;o) at the end.

Terry, W0FM

-Original Message-
From: Eric Swartz - WA6HHQ, Elecraft [mailto:e...@elecraft.com] 
Sent: Thursday, November 11, 2010 10:55 AM
To: Terry Schieler
Cc: 'Phil LaMarche'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft Amplifier

This is a totally inappropriate posting for the reflector and is outside 
of the list guidelines.

It is never appropriate to make rude and directly critical postings 
about another list member.

Please see the list guidelines at:
http://www.elecraft.com/elecraft_list_guidelines.htm

73,
Eric  WA6HHQ
Elecraft List Moderator



On 11/11/2010 7:41 AM, Terry Schieler wrote:
 Phil,

 Anyone who has just spent 5 weeks cruising through Europe then rubs our
 noses in it on this reflector probably doesn't DESERVE an amplifier.  ;o)

 Terry, W0FM


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Re: [Elecraft] Elecraft Amplifier

[Eric Swartz - WA6HHQ, Elecraft]

OK Phil - No harm done.  I apologize if I reacted too quickly.

Email is a pretty sterile medium where its hard to see if someone is 
making a friendly tongue-in-cheek comment, or something more serious. it 
is easy to misinterpret the meaning of a posting. I received a number of 
concerned emails about this one which generated my comment.

Probably best in the future to make these emails direct off list when 
commenting between friends :-)

73, Eric
Elecraft List moderator
-


On 11/11/2010 9:00 AM, Terry Schieler wrote:
 Sorry Eric.  It was meant in fun.  Phil and I have known each other for some
 time now.  He got the humor.  I apologize if it did not come across as
 intended.  Hence the ;o) at the end.

 Terry, W0FM

 -Original Message-
 From: Eric Swartz - WA6HHQ, Elecraft [mailto:e...@elecraft.com]
 Sent: Thursday, November 11, 2010 10:55 AM
 To: Terry Schieler
 Cc: 'Phil LaMarche'; elecraft@mailman.qth.net
 Subject: Re: [Elecraft] Elecraft Amplifier

 This is a totally inappropriate posting for the reflector and is outside
 of the list guidelines.

 It is never appropriate to make rude and directly critical postings
 about another list member.

 Please see the list guidelines at:
 http://www.elecraft.com/elecraft_list_guidelines.htm

 73,
 Eric  WA6HHQ
 Elecraft List Moderator



 On 11/11/2010 7:41 AM, Terry Schieler wrote:
 Phil,

 Anyone who has just spent 5 weeks cruising through Europe then rubs our
 noses in it on this reflector probably doesn't DESERVE an amplifier.  ;o)

 Terry, W0FM

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Re: [Elecraft] Elecraft Amplifier

[Eric Swartz - WA6HHQ, Elecraft]

Correction - Terry (not Phil)

73, Eric


On 11/11/2010 9:10 AM, Eric Swartz - WA6HHQ, Elecraft wrote:
 OK Phil - No harm done.  I apologize if I reacted too quickly.

 Email is a pretty sterile medium where its hard to see if someone is 
 making a friendly tongue-in-cheek comment, or something more serious. 
 it is easy to misinterpret the meaning of a posting. I received a 
 number of concerned emails about this one which generated my comment.

 Probably best in the future to make these emails direct off list when 
 commenting between friends :-)

 73, Eric
 Elecraft List moderator
 -


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[Elecraft] Elecraft Amplifier

[Phil LaMarche]

I've been off the reflector for 5 weeks on a cruise in Europe.  Has there
been any announcement for anticipated delivery.  Thanks
 
Phil
 
Philip LaMarche
 
LaMarche Enterprises, Inc
p...@lamarcheenterprises.com
www.LaMarcheEnterprises.com http://www.lamarcheenterprises.com/  
 
727-944-3226
727-937-8834 Fax
727-510-5038 Cell 
 
www.w9dvm.com http://www.w9dvm.com/ 
 
K3 #1605
 
CCA 98-00827
CRA 1701
W9DVM
 
 
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Re: [Elecraft] Elecraft Amplifier

[Gary Gregory]

Nope  :-(

But we are all living in hope :-)

73's
Gary

On Wed, Nov 10, 2010 at 10:25 PM, Phil LaMarche plama...@verizon.netwrote:

 I've been off the reflector for 5 weeks on a cruise in Europe.  Has there
 been any announcement for anticipated delivery.  Thanks

 Phil

 Philip LaMarche

 LaMarche Enterprises, Inc
 p...@lamarcheenterprises.com
 www.LaMarcheEnterprises.com http://www.lamarcheenterprises.com/

 727-944-3226
 727-937-8834 Fax
 727-510-5038 Cell

 www.w9dvm.com http://www.w9dvm.com/

 K3 #1605

 CCA 98-00827
 CRA 1701
 W9DVM


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-- 
Gary
VK4FD - Motorhome Mobile
http://www.qsl.net/vk4fd/
K3 #679, P3 #546
For everything else there's Mastercard!!!
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[Elecraft] Amplifier Cable:K3 to Alpha 8410

[pastormg2]

It was suggested to connect my K3 to my Alpha 8410 that I could purchase a 
shielded cable from Radio Shack.  I need one end to be a phono plug and I 
assume that the end that connects to the K3 is also a phono plug.  Does anyone 
have any suggestions looking through the Radio Shack website as to the cable 
that would work the best.  Thanks for your help!  Mark KB3Z
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Re: [Elecraft] Amplifier Cable:K3 to Alpha 8410

[Philip Leonard]

I just use a regular old phono (RCA to RCA) cable between my K3 and 
87A.  Works fine.



On 10/15/2010 1:50 PM, pastor...@verizon.net wrote:

 It was suggested to connect my K3 to my Alpha 8410 that I could purchase a 
 shielded cable from Radio Shack.  I need one end to be a phono plug and I 
 assume that the end that connects to the K3 is also a phono plug.  Does 
 anyone have any suggestions looking through the Radio Shack website as to the 
 cable that would work the best.  Thanks for your help!  Mark KB3Z
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Re: [Elecraft] Amplifier Cable:K3 to Alpha 8410

[Ron D'Eau Claire]

If you're after decent shielding to keep RF out of the circuit, Radio Shack
might have what you want. Nowadays a high impedance is typically 1 or 2K
ohms instead of the 50K ohms are more common a few decades ago. Audio cable
shielding has been reduced accordingly - especially from lower-cost
suppliers. Where audio cable shields used to look much like the shield on
good RF coaxial cable, nowadays it's common to find RS and other low-cost
cables have a shield that consists of a few strands of bare wire running
parallel to the insulated center conductor - maybe 10% or less shielding. 

For that reason I make my own using RF type coaxial cable. RG-174 makes
excellent lightweight shielded cables with a diameter of about 1/8. 

Ron AC7AC

-Original Message-

I just use a regular old phono (RCA to RCA) cable between my K3 and 
87A.  Works fine.



On 10/15/2010 1:50 PM, pastor...@verizon.net wrote:

 It was suggested to connect my K3 to my Alpha 8410 that I could purchase a
shielded cable from Radio Shack.  I need one end to be a phono plug and I
assume that the end that connects to the K3 is also a phono plug.  Does
anyone have any suggestions looking through the Radio Shack website as to
the cable that would work the best.  Thanks for your help!  Mark KB3Z

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Re: [Elecraft] Amplifier Cable:K3 to Alpha 8410

[Radio Amateur N5GE]

On Fri, 15 Oct 2010 14:12:34 -0500, Philip Leonard
leoli...@seidkr.com wrote:

Same here.

Tom, N5GE

K3 #806 with SUB RX, PR6, 
KRC2 and K144XV
K3 #1055 with PR6 and XV432
W1, 2 W2's and other small kits

QCWA Life Member 35102

n...@n5ge.com
http://www.n5ge.com
http://www.swotrc.net

I just use a regular old phono (RCA to RCA) cable between my K3 and 
87A.  Works fine.



On 10/15/2010 1:50 PM, pastor...@verizon.net wrote:

 It was suggested to connect my K3 to my Alpha 8410 that I could purchase a 
 shielded cable from Radio Shack.  I need one end to be a phono plug and I 
 assume that the end that connects to the K3 is also a phono plug.  Does 
 anyone have any suggestions looking through the Radio Shack website as to 
 the cable that would work the best.  Thanks for your help!  Mark KB3Z
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Re: [Elecraft] Amplifier Cable:K3 to Alpha 8410

[Guy Olinger K2AV]

I use Radio shack VIDEO cables for RCA to RCA connections in the
shack.  They seem to have shields.  73, Guy.
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Re: [Elecraft] Amplifier Cable:K3 to Alpha 8410

[Ron D'Eau Claire]

Good point, guy. I discovered the minimal shields when I bought an AUDIO
cable from them to use with an old crystal-element microphone. What a
surprise when I was greeted with tons of 60 Hz hum. That was when I
discovered the minimal shielding by opening it and a few other audio cables
I had from them to check. With modern audio gear, the minimal shields are
just fine most of the time - but not in a strong RF environment :-)  

Tnx for the head's up on video cables. 

Ron AC7AC

-Original Message-
I use Radio shack VIDEO cables for RCA to RCA connections in the
shack.  They seem to have shields.  73, Guy.

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Re: [Elecraft] Amplifier Cable:K3 to Alpha 8410

[Jim Brown]

  On 10/15/2010 12:31 PM, Ron D'Eau Claire wrote:
 For that reason I make my own using RF type coaxial cable. RG-174 makes
 excellent lightweight shielded cables with a diameter of about 1/8.
That's very good advice, Ron.

73, Jim K9YC
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Re: [Elecraft] Amplifier

[Brett Howard]

Actually its my work to design and get products through these types of
regulations so I tend to like to know how these different rules work
and how people cope with them.  If its not your thing great that's why
there are people like me.

~Brett (N7MG)

On Tue, Aug 10, 2010 at 8:33 PM, Tim Tucker ae...@worldwidedx.com wrote:
 The FCC Certified it, so who cares?  If you spend all your time trying to
 figure out why our government has rules that it routinely ignores, you're
 going to drive yourself crazy.

 The speed limit on the national highway system is 75mph.  Yet the NTSB has
 no problem with manufacturers that sell cars that go twice that fast.
 Meanwhile, you're surprised that the FCC ignores the 15db gain rule?
 Really?  Anyone could come up with a thousand examples.


 On Tue, Aug 10, 2010 at 7:51 PM, Brett Howard br...@livecomputers.comwrote:

 Why be sorry I'm only wondering... I'd thought that over 15dB of gain
 was against the rules.  10W is 40dBm thus +15dBm is 55dBm or a little
 over 300Watts.

 Lyle's aforementioned 35 watts would be 45dBm +15 gives you 60dBm
 which the KPA500 aint a gonna do...  Guess the KPA500 is probably only
 going to provide around 12dB of gain.  While if your measurements are
 correct the SPE Expert 1K-FA is giving you 17dB of gain.

 Not challenging you I was just wondering.

 ~Brett (N7MG)

 On Tue, Aug 10, 2010 at 5:58 PM, W4GRJ w4...@satterfield.org wrote:
  The Expert 1K-FA is FCC Certified.maybe my meter is not accurate
 
  In any event, I am sorry I ever commented on this reflector with such
  responses.
 
  Jack
  W4GRJ
 
 

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Re: [Elecraft] Amplifier

[Mel Farrer]

The FCC loves to question the logical and pass others.  I have applied for and 
gotten more than a few experimental licenses that let me do things the FCC 
would otherwise reject
Go figure.

Mel

--- On Wed, 8/11/10, Brett Howard br...@livecomputers.com wrote:

From: Brett Howard br...@livecomputers.com
Subject: Re: [Elecraft] Amplifier
To: Tim Tucker ae...@worldwidedx.com
Cc: elecraft@mailman.qth.net
Date: Wednesday, August 11, 2010, 3:20 PM

Actually its my work to design and get products through these types of
regulations so I tend to like to know how these different rules work
and how people cope with them.  If its not your thing great that's why
there are people like me.

~Brett (N7MG)

On Tue, Aug 10, 2010 at 8:33 PM, Tim Tucker ae...@worldwidedx.com wrote:
 The FCC Certified it, so who cares?  If you spend all your time trying to
 figure out why our government has rules that it routinely ignores, you're
 going to drive yourself crazy.

 The speed limit on the national highway system is 75mph.  Yet the NTSB has
 no problem with manufacturers that sell cars that go twice that fast.
 Meanwhile, you're surprised that the FCC ignores the 15db gain rule?
 Really?  Anyone could come up with a thousand examples.


 On Tue, Aug 10, 2010 at 7:51 PM, Brett Howard br...@livecomputers.comwrote:

 Why be sorry I'm only wondering... I'd thought that over 15dB of gain
 was against the rules.  10W is 40dBm thus +15dBm is 55dBm or a little
 over 300Watts.

 Lyle's aforementioned 35 watts would be 45dBm +15 gives you 60dBm
 which the KPA500 aint a gonna do...  Guess the KPA500 is probably only
 going to provide around 12dB of gain.  While if your measurements are
 correct the SPE Expert 1K-FA is giving you 17dB of gain.

 Not challenging you I was just wondering.

 ~Brett (N7MG)

 On Tue, Aug 10, 2010 at 5:58 PM, W4GRJ w4...@satterfield.org wrote:
  The Expert 1K-FA is FCC Certified.maybe my meter is not accurate
 
  In any event, I am sorry I ever commented on this reflector with such
  responses.
 
  Jack
  W4GRJ
 
 

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[Elecraft] Amplifier

[Richard]

I know that at Dayton, Elecraft showed an outboard amplifier to be available at 
a later date.
I presently have a K3 10 and am wondering id the 10 watts will be enough to 
kick the new amp and does anybody have an idea how many dollar$ ?
Sorry if this was already covered.

   A happy K3 owner Rich KC8HMJ
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Re: [Elecraft] Amplifier

[Lyle Johnson]

 ...I presently have a K3 10 and am wondering if the 10 watts will be enough 
 to kick the new amp

Yes, it will.  You'll likely get more than 100 watts but less than 200 
watts output with 10 watts of drive.  If you want the full 500+ watts, 
then you'll probably need 30W to 40W of drive.

73,

Lyle KK7P

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Re: [Elecraft] Amplifier

[W4GRJ]

Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive = 500
watts out

Jack
W4GRJ


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
Sent: Tuesday, August 10, 2010 1:33 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier


 ...I presently have a K3 10 and am wondering if the 10 watts will be
enough to kick the new amp

Yes, it will.  You'll likely get more than 100 watts but less than 200 
watts output with 10 watts of drive.  If you want the full 500+ watts, 
then you'll probably need 30W to 40W of drive.

73,

Lyle KK7P

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Re: [Elecraft] Amplifier

[Robert Friess]

If the SPE does that, which is 17dB gain, then it does not conform to FCC
rules that limit gain to 15dB.

Bob, N6CM

On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:

 Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive = 500
 watts out

 Jack
 W4GRJ


 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
 Sent: Tuesday, August 10, 2010 1:33 PM
 To: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] Amplifier


  ...I presently have a K3 10 and am wondering if the 10 watts will be
 enough to kick the new amp

 Yes, it will.  You'll likely get more than 100 watts but less than 200
 watts output with 10 watts of drive.  If you want the full 500+ watts,
 then you'll probably need 30W to 40W of drive.

 73,

 Lyle KK7P

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Re: [Elecraft] Amplifier

[Tim Tucker]

And yet they certified it.
http://www.radio-ham.eu/Download/FCC-Certification.pdf


On Tue, Aug 10, 2010 at 1:13 PM, Robert Friess rfri...@usa.net wrote:

 If the SPE does that, which is 17dB gain, then it does not conform to FCC
 rules that limit gain to 15dB.

 Bob, N6CM

 On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:

  Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive =
 500
  watts out
 
  Jack
  W4GRJ
 
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net
  [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
  Sent: Tuesday, August 10, 2010 1:33 PM
  To: elecraft@mailman.qth.net
  Subject: Re: [Elecraft] Amplifier
 
 
   ...I presently have a K3 10 and am wondering if the 10 watts will be
  enough to kick the new amp
 
  Yes, it will.  You'll likely get more than 100 watts but less than 200
  watts output with 10 watts of drive.  If you want the full 500+ watts,
  then you'll probably need 30W to 40W of drive.
 
  73,
 
  Lyle KK7P
 
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Re: [Elecraft] Amplifier

[Phil LaMarche]

Does any one know if the KPA500 has been certified yet?

Phil 


Philip LaMarche
 
LaMarche Enterprises, Inc
p...@lamarcheenterprises.com
www.LaMarcheEnterprises.com 
 
727-944-3226
727-937-8834 Fax
727-510-5038 Cell 
 
www.w9dvm.com
 
K3 #1605
 
CCA 98-00827
CRA 1701
W9DVM
 

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tim Tucker
Sent: Tuesday, August 10, 2010 4:31 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier

And yet they certified it.
http://www.radio-ham.eu/Download/FCC-Certification.pdf


On Tue, Aug 10, 2010 at 1:13 PM, Robert Friess rfri...@usa.net wrote:

 If the SPE does that, which is 17dB gain, then it does not conform to 
 FCC rules that limit gain to 15dB.

 Bob, N6CM

 On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:

  Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts 
  drive =
 500
  watts out
 
  Jack
  W4GRJ
 
 
  -Original Message-
  From: elecraft-boun...@mailman.qth.net 
  [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
  Sent: Tuesday, August 10, 2010 1:33 PM
  To: elecraft@mailman.qth.net
  Subject: Re: [Elecraft] Amplifier
 
 
   ...I presently have a K3 10 and am wondering if the 10 watts will 
   be
  enough to kick the new amp
 
  Yes, it will.  You'll likely get more than 100 watts but less than 
  200 watts output with 10 watts of drive.  If you want the full 500+ 
  watts, then you'll probably need 30W to 40W of drive.
 
  73,
 
  Lyle KK7P
 
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Re: [Elecraft] Amplifier

[Tom W8JI]

 Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive = 
 500
 watts out

http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr;sid=f338c42916def7b9976d97732e60ec83;rgn=div8;view=text;node=47%3A5.0.1.1.6.4.157.9;idno=47;cc=ecfr

§ 97.317   Standards for certification of external RF power amplifiers.
(a) To receive a grant of certification, the amplifier must:

(1) Satisfy the spurious emission standards of §97.307 (d) or (e) of this 
part, as applicable, when the amplifier is operated at the lesser of 1.5 kW 
PEP or its full output power and when the amplifier is placed in the 
standby or off positions while connected to the transmitter.

(2) Not be capable of amplifying the input RF power (driving signal) by more 
than 15 dB gain. Gain is defined as the ratio of the input RF power to the 
output RF power of the amplifier where both power measurements are expressed 
in peak envelope power or mean power.

(3) Exhibit no amplification (0 dB gain) between 26 MHz and 28 MHz.

(b) Certification shall be denied when:

(1) The Commission determines the amplifier can be used in services other 
than the Amateur Radio Service, or

(2) The amplifier can be easily modified to operate on frequencies between 
26 MHz and 28 MHz.

[71 FR 66465, Nov. 15, 2006]

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Re: [Elecraft] Amplifier

[Tim Tucker]

If it has, it hasn't hit the FCC website yet.  I just searched.



On Tue, Aug 10, 2010 at 1:35 PM, Phil LaMarche plama...@verizon.net wrote:


 Does any one know if the KPA500 has been certified yet?

 Phil


 Philip LaMarche

 LaMarche Enterprises, Inc
 p...@lamarcheenterprises.com
 www.LaMarcheEnterprises.com

 727-944-3226
 727-937-8834 Fax
 727-510-5038 Cell

 www.w9dvm.com

 K3 #1605

 CCA 98-00827
 CRA 1701
 W9DVM


 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Tim Tucker
 Sent: Tuesday, August 10, 2010 4:31 PM
 To: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] Amplifier

 And yet they certified it.
 http://www.radio-ham.eu/Download/FCC-Certification.pdf


 On Tue, Aug 10, 2010 at 1:13 PM, Robert Friess rfri...@usa.net wrote:

  If the SPE does that, which is 17dB gain, then it does not conform to
  FCC rules that limit gain to 15dB.
 
  Bob, N6CM
 
  On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:
 
   Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts
   drive =
  500
   watts out
  
   Jack
   W4GRJ
  
  
   -Original Message-
   From: elecraft-boun...@mailman.qth.net
   [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
   Sent: Tuesday, August 10, 2010 1:33 PM
   To: elecraft@mailman.qth.net
   Subject: Re: [Elecraft] Amplifier
  
  
...I presently have a K3 10 and am wondering if the 10 watts will
be
   enough to kick the new amp
  
   Yes, it will.  You'll likely get more than 100 watts but less than
   200 watts output with 10 watts of drive.  If you want the full 500+
   watts, then you'll probably need 30W to 40W of drive.
  
   73,
  
   Lyle KK7P
  
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Re: [Elecraft] Amplifier

[David Cutter]

$2200

David
G3UNA


and does anybody have an idea how many dollar$ ?
 Sorry if this was already covered.
 
   A happy K3 owner Rich KC8HMJ
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Re: [Elecraft] Amplifier

[Brett Howard]

Huh?  I thought that was illegal?

~Brett (N7MG)

On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:
 Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive = 500
 watts out

 Jack
 W4GRJ


 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
 Sent: Tuesday, August 10, 2010 1:33 PM
 To: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] Amplifier


 ...I presently have a K3 10 and am wondering if the 10 watts will be
 enough to kick the new amp

 Yes, it will.  You'll likely get more than 100 watts but less than 200
 watts output with 10 watts of drive.  If you want the full 500+ watts,
 then you'll probably need 30W to 40W of drive.

 73,

 Lyle KK7P

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Re: [Elecraft] Amplifier

[W4GRJ]

The Expert 1K-FA is FCC Certified.maybe my meter is not accurate

In any event, I am sorry I ever commented on this reflector with such
responses.

Jack
W4GRJ


-Original Message-
From: Brett Howard [mailto:br...@livecomputers.com] 
Sent: Tuesday, August 10, 2010 8:48 PM
To: W4GRJ
Cc: Lyle Johnson; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Amplifier

Huh?  I thought that was illegal?

~Brett (N7MG)

On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:
 Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive =
500
 watts out

 Jack
 W4GRJ


 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
 Sent: Tuesday, August 10, 2010 1:33 PM
 To: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] Amplifier


 ...I presently have a K3 10 and am wondering if the 10 watts will be
 enough to kick the new amp

 Yes, it will.  You'll likely get more than 100 watts but less than 200
 watts output with 10 watts of drive.  If you want the full 500+ watts,
 then you'll probably need 30W to 40W of drive.

 73,

 Lyle KK7P

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Re: [Elecraft] Amplifier

[Brett Howard]

Why be sorry I'm only wondering... I'd thought that over 15dB of gain
was against the rules.  10W is 40dBm thus +15dBm is 55dBm or a little
over 300Watts.

Lyle's aforementioned 35 watts would be 45dBm +15 gives you 60dBm
which the KPA500 aint a gonna do...  Guess the KPA500 is probably only
going to provide around 12dB of gain.  While if your measurements are
correct the SPE Expert 1K-FA is giving you 17dB of gain.

Not challenging you I was just wondering.

~Brett (N7MG)

On Tue, Aug 10, 2010 at 5:58 PM, W4GRJ w4...@satterfield.org wrote:
 The Expert 1K-FA is FCC Certified.maybe my meter is not accurate

 In any event, I am sorry I ever commented on this reflector with such
 responses.

 Jack
 W4GRJ


 -Original Message-
 From: Brett Howard [mailto:br...@livecomputers.com]
 Sent: Tuesday, August 10, 2010 8:48 PM
 To: W4GRJ
 Cc: Lyle Johnson; elecraft@mailman.qth.net
 Subject: Re: [Elecraft] Amplifier

 Huh?  I thought that was illegal?

 ~Brett (N7MG)

 On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:
 Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive =
 500
 watts out

 Jack
 W4GRJ


 -Original Message-
 From: elecraft-boun...@mailman.qth.net
 [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
 Sent: Tuesday, August 10, 2010 1:33 PM
 To: elecraft@mailman.qth.net
 Subject: Re: [Elecraft] Amplifier


 ...I presently have a K3 10 and am wondering if the 10 watts will be
 enough to kick the new amp

 Yes, it will.  You'll likely get more than 100 watts but less than 200
 watts output with 10 watts of drive.  If you want the full 500+ watts,
 then you'll probably need 30W to 40W of drive.

 73,

 Lyle KK7P

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Re: [Elecraft] Amplifier

[Tony Fegan VE3QF]

If we want to split hairs, the 1K-FA is actually advertised as having a 
gain of 16dB!! So they are not hiding anything.

73
Tony Fegan VE3QF

Brett Howard wrote:
 Why be sorry I'm only wondering... I'd thought that over 15dB of gain
 was against the rules.  10W is 40dBm thus +15dBm is 55dBm or a little
 over 300Watts.

 
 ~Brett (N7MG)
 
 On Tue, Aug 10, 2010 at 5:58 PM, W4GRJ w4...@satterfield.org wrote:
 The Expert 1K-FA is FCC Certified.maybe my meter is not accurate


 Jack
 W4GRJ


 On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:
 Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive =
 500
 watts out

 Jack
 W4GRJ


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Re: [Elecraft] Amplifier

[Gary Gregory]

KPA-500..new Elecraft Slogan...I JUST WANT ONE!

Oh well, back in my cave.

Gary

On Wed, Aug 11, 2010 at 1:11 PM, Tony Fegan VE3QF jafe...@rogers.comwrote:

 If we want to split hairs, the 1K-FA is actually advertised as having a
 gain of 16dB!! So they are not hiding anything.

 73
Tony Fegan VE3QF

 Brett Howard wrote:
  Why be sorry I'm only wondering... I'd thought that over 15dB of gain
  was against the rules.  10W is 40dBm thus +15dBm is 55dBm or a little
  over 300Watts.
 
 
  ~Brett (N7MG)
 
  On Tue, Aug 10, 2010 at 5:58 PM, W4GRJ w4...@satterfield.org wrote:
  The Expert 1K-FA is FCC Certified.maybe my meter is not accurate
 
 
  Jack
  W4GRJ
 
 
  On Tue, Aug 10, 2010 at 12:37 PM, W4GRJ w4...@satterfield.org wrote:
  Depends on the Amplifier, I have a SPE Expert 1K-FA.10watts drive =
  500
  watts out
 
  Jack
  W4GRJ
 
 
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-- 
Gary
VK4FD - Motorhome Mobile
http://www.qsl.net/vk4fd/
K3 #679
For everything else there's Mastercard!!!
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Re: [Elecraft] Amplifier

[Tim Tucker]

The FCC Certified it, so who cares?  If you spend all your time trying to
figure out why our government has rules that it routinely ignores, you're
going to drive yourself crazy.

The speed limit on the national highway system is 75mph.  Yet the NTSB has
no problem with manufacturers that sell cars that go twice that fast.
Meanwhile, you're surprised that the FCC ignores the 15db gain rule?
Really?  Anyone could come up with a thousand examples.


On Tue, Aug 10, 2010 at 7:51 PM, Brett Howard br...@livecomputers.comwrote:

 Why be sorry I'm only wondering... I'd thought that over 15dB of gain
 was against the rules.  10W is 40dBm thus +15dBm is 55dBm or a little
 over 300Watts.

 Lyle's aforementioned 35 watts would be 45dBm +15 gives you 60dBm
 which the KPA500 aint a gonna do...  Guess the KPA500 is probably only
 going to provide around 12dB of gain.  While if your measurements are
 correct the SPE Expert 1K-FA is giving you 17dB of gain.

 Not challenging you I was just wondering.

 ~Brett (N7MG)

 On Tue, Aug 10, 2010 at 5:58 PM, W4GRJ w4...@satterfield.org wrote:
  The Expert 1K-FA is FCC Certified.maybe my meter is not accurate
 
  In any event, I am sorry I ever commented on this reflector with such
  responses.
 
  Jack
  W4GRJ
 
 

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Re: [Elecraft] Amplifier

[Eric Swartz WA6HHQ - Elecraft]

Folks, lets end the argument portion of this thread. This is outside of the 
list guidelines (just reposted).

Keep it cordial.

73,
Eric
elecraft List Moderator

www.elecraft.com
_..._



On Aug 10, 2010, at 8:33 PM, Tim Tucker ae...@worldwidedx.com wrote:

 The FCC Certified it, so who cares?  If you spend all your time trying to
 figure out why our government has rules that it routinely ignores, you're
 going to drive yourself crazy.
 
 The speed limit on the national highway system is 75mph.  Yet the NTSB has
 no problem with manufacturers that sell cars that go twice that fast.
 Meanwhile, you're surprised that the FCC ignores the 15db gain rule?
 Really?  Anyone could come up with a thousand examples.
 
 
 On Tue, Aug 10, 2010 at 7:51 PM, Brett Howard br...@livecomputers.comwrote:
 
 Why be sorry I'm only wondering... I'd thought that over 15dB of gain
 was against the rules.  10W is 40dBm thus +15dBm is 55dBm or a little
 over 300Watts.
 
 Lyle's aforementioned 35 watts would be 45dBm +15 gives you 60dBm
 which the KPA500 aint a gonna do...  Guess the KPA500 is probably only
 going to provide around 12dB of gain.  While if your measurements are
 correct the SPE Expert 1K-FA is giving you 17dB of gain.
 
 Not challenging you I was just wondering.
 
 ~Brett (N7MG)
 
 On Tue, Aug 10, 2010 at 5:58 PM, W4GRJ w4...@satterfield.org wrote:
 The Expert 1K-FA is FCC Certified.maybe my meter is not accurate
 
 In any event, I am sorry I ever commented on this reflector with such
 responses.
 
 Jack
 W4GRJ
 
 
 
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[Elecraft] Amplifier tuning K3 (was QRQ QSK)

[Tom W8JI]

A two-tone generator is OK for testing an amp on a spectrum 
analyzer for odd-order IM performance, but is one of the 
last things people should use for daily tuning of an 
amplifier.

The most desirable thing is something that has a very low 
average power and full or even slightly above full peak 
power pulse. Single tone is fine, so long as the peaks are 
at or slightly over the maximum power ever expected, very 
narrow in width, and fairly wide gaps with no power. We 
really want low duty cycle  pulses to tune with.

73 Tom



- Original Message - 
From: Greg n...@cableone.net
To: elecraft@mailman.qth.net
Sent: Friday, May 14, 2010 10:38 PM
Subject: Re: [Elecraft] How is K3 QRQ QSK performance 50-100 
WPM?


 The K3 has a two tone oscillator built in that you can use 
 for tuning...  73
 de Greg-N4CC

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Re: [Elecraft] Amplifier suggestions?

[Maarten van Rossum]

Let's say, for argument's sake, I too have a THP 1.5 (which I do not). My
work and family take up most, if not all of my time. I can only put a couple
of feet of wire to use as a antenna because of HOAs. I have 10 countries
confirmed because I don't care for QSL cards or LOTW.
Does that make it a bad amplifier? I hope not.

I don't actually own a Acom 1000 but have used one for many hours at our
contest station or during field days. We Also use a ACOM 2000. Both
amplifiers are very good and near bullet proof. It has a very good
protection system which shuts down the amp if something is wrong. That said,
it will take a wide range of SWR without shutting down which makes it easy
to use because you don't have to retune it every time. If you do have to
tune the 1000, it will only take you a couple of seconds because tuning is a
breeze. The 2000 is fully automatic so you tuning that monster is even more
easy.

Our amps get a lot of use and abuse but up till now we never had a problem.
To give an example, last year we went to OZ to participate in the IARU
region 1 field day with the OZ5GX group. I had met them a year earlier
during summer holidays. During the field day we obviously used a generator
to power our equipment. It was a Diesel generator which provided 380 V.
After some rewiring we got 230 V which we needed for our equipment. After a
couple of hours something went wrong and the Acom started to shut itself
down repeativly and on the display it showed a code of letters and numbers.
I grabbed the manual to find out what it meant. I quickly found out it meant
High Voltage so I decided to check the voltage at the power outlets. The
multi meter showed 270 V (!). We quickly switched off all equipment and the
generator. None of the other equipment showed any problems but thanks to the
Acom we new that something was wrong and were able to fix it before any
damage was done.
As for the THP, I never used one so I can't comment on that amp.

73, Maarten
PD2R



2010/1/19 David Christ radio...@mchsi.com

 Was over at a friends shack who is driving a Tokyo High Power 1.5
 with a K2.  He speaks very highly of it.  He fired things up and got
 through to a South African station first call on RTTY and then
 switched over to SSB and used a vertical to work a ZD station I
 think.  Got through the pile up on first call.  Very impressive.  He
 has 296 countries confirmed and has a FT-930 which sits in the corner
 unused.

  From what I saw, if the THP 1.5 is in your budget you probably
 wouldn't be disappointed.

 David k0LUM
 Eastern Iowa

 At 6:48 PM -0800 1/18/10, David Beckwith wrote:
 I am thinking about a move up in power for my K2/100.  The reviews
 seem to favor an Acom 1000 or Tokyo Hi-Power.  What is the collective
 wisdom here? Thanks
 Dave  K6CGE
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Re: [Elecraft] Amplifier suggestions?

[Arie Kleingeld PA3A]

Dave,

I've run Drakes L4B and L-75, Yaesu FL-2100z and Commander hf2500. Never
bought one of these new.

All four are good amps if you know what you are doing when you tune and use
it. If you don't know or if you want it all automatic , then take the
automatic ones as suggested. (they are usually more expensive...)

73 Arie PA3A

-Oorspronkelijk bericht-
Van: elecraft-boun...@mailman.qth.net


I am thinking about a move up in power for my K2/100.  The reviews   
seem to favor an Acom 1000 or Tokyo Hi-Power.  What is the collective  
wisdom here? Thanks
Dave  K6CGE
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[Elecraft] Amplifier suggestions

[Ralph Parker]

...The reviews seem to favor an Acom 1000 or Tokyo Hi-Power...

I have an Acom 1000, and love it!
Almost silent in operation (including true QSK), protects itself from
everything (including me), and matches any reasonable load. Tubes not as
cheap as they have  been, but still available at reasonabe cost, and if
treated kindly, should last for (almost) ever.

I have no experience with solid-state amps, but if I ever get one, it will
probably be an Elecraft (maybe I'm still on the KPA800 list :-)

VE7XF

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[Elecraft] Amplifier suggestions?

[David Beckwith]

I am thinking about a move up in power for my K2/100.  The reviews   
seem to favor an Acom 1000 or Tokyo Hi-Power.  What is the collective  
wisdom here? Thanks
Dave  K6CGE
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Re: [Elecraft] Amplifier suggestions?

[David Christ]

Was over at a friends shack who is driving a Tokyo High Power 1.5 
with a K2.  He speaks very highly of it.  He fired things up and got 
through to a South African station first call on RTTY and then 
switched over to SSB and used a vertical to work a ZD station I 
think.  Got through the pile up on first call.  Very impressive.  He 
has 296 countries confirmed and has a FT-930 which sits in the corner 
unused.

 From what I saw, if the THP 1.5 is in your budget you probably 
wouldn't be disappointed.

David k0LUM
Eastern Iowa

At 6:48 PM -0800 1/18/10, David Beckwith wrote:
I am thinking about a move up in power for my K2/100.  The reviews  
seem to favor an Acom 1000 or Tokyo Hi-Power.  What is the collective 
wisdom here? Thanks
Dave  K6CGE
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[Elecraft] Amplifier Relay Keying Circuit

[Patrick Skerrett]

Hello folks,

I'm trying to build a simple relay circuit to key a Yaesu FL2100B 
amplifier. The amplifier uses negative keying voltage, so I need to have 
some sort of interface in between the K3 and the amp (Per the manual, 
the K3 supports +200v but not negative voltage).

If I put an ohm meter on the K3's key out jack, and hook the positive 
lead to the center conductor, and the negative lead on the shield, I 
measure an open when the K3 is not keyed up, and measure a short when 
the K3 is transmitting. So far so good..

I built a simple circuit that looks something like this:


   Center conductor on K3 Key line
   |
   |
   |
+12V from power supply -- Relay 
coil   
 |
 |
  Shield on K3 Key line


-12v from power supply Relay coil



When I DO NOT have the K3's key out plugged into this circuit, and short 
the RCA cable, the relay closes  the circuit works. Again, so far so 
good.

However, when I try this plugged into the K3 and hit the transmit, the 
relay does not close.

Why would I be able to measure a short on the K3's key out when 
transmitting, however it will not bridge my 12v  close the relay circuit?

I hope I'm not doing something very stupid here :)

Thanks,

W9PDS
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Re: [Elecraft] Amplifier Relay Keying Circuit

[Iain MacDonnell - N6ML]

Patrick,

Move the K3 Key Out to the other side of the relay - think of it as a
sink to ground. i.e. connect +12V directly to one end of the relay
coil, and connect the other end of the relay coil to the center of the
Key Out jack. When the K3 transmits, the path to ground will be
connected, and the coil will be energised.

Of course it's always good practice to put a diode across the relay coil
to prevent the kick-back from potentially damaging the solid-state
switch that's driving it.

 ~Iain / N6ML


Patrick Skerrett wrote:
 Hello folks,
 
 I'm trying to build a simple relay circuit to key a Yaesu FL2100B 
 amplifier. The amplifier uses negative keying voltage, so I need to have 
 some sort of interface in between the K3 and the amp (Per the manual, 
 the K3 supports +200v but not negative voltage).
 
 If I put an ohm meter on the K3's key out jack, and hook the positive 
 lead to the center conductor, and the negative lead on the shield, I 
 measure an open when the K3 is not keyed up, and measure a short when 
 the K3 is transmitting. So far so good..
 
 I built a simple circuit that looks something like this:
 
 
Center conductor on K3 Key line
|
|
|
 +12V from power supply -- Relay 
 coil   
  |
  |
   Shield on K3 Key line
 
 
 -12v from power supply Relay coil
 
 
 
 When I DO NOT have the K3's key out plugged into this circuit, and short 
 the RCA cable, the relay closes  the circuit works. Again, so far so 
 good.
 
 However, when I try this plugged into the K3 and hit the transmit, the 
 relay does not close.
 
 Why would I be able to measure a short on the K3's key out when 
 transmitting, however it will not bridge my 12v  close the relay circuit?
 
 I hope I'm not doing something very stupid here :)
 
 Thanks,
 
 W9PDS
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Re: [Elecraft] Amplifier Relay Keying Circuit

[Paul Christensen]

Pat,

Are you using the same K3 power supply to provide power to the relay?  Or, 
is it a separate power supply (e.g., a wall-wart type?)

If it's the same supply, then --

1)  The (+) lead from the power supply is tied to one side of the 12VDC 
relay.  If it's a polarized relay (i.e., with internal quenching diode) then 
ensure the supply (+) lead is tied to the relay's (+) terminal; and

2) The opposite relay terminal (-) is then tied to the K3 center Key Out 
jack.  The shield in your diagram is not necessary to complete the circuit.

Upon transmitting, the center KEY OUT jack nearly reaches ground potential 
and the relay closes.  If you're using a separate power supply to the relay, 
you'll need to tie together the negative leads of the K3's power supply with 
the negative lead of the external supply.

In either case, I would consider placement of a suitable fuse in series with 
the relay's (+) lead.

Paul, W9AC 

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[Elecraft] Amplifier for K-2/10

[KM4VX]

I know about the KPA/100 option for the K-2, but wonder if there are any
alternatives for obtaining 100 watts output or better from the K-2. I am
looking for an amplifier that might produce 100 watts or better with an
input of only 10 watts from the K-2. If anyone knows of one out there it
would be interesting to have that information posted here. I would find a
separate amplifier unit more convenient than an internal upgrade to the K-2.
Thanks. KM4VX
-- 
View this message in context: 
http://n2.nabble.com/Amplifier-for-K-2-10-tp3129848p3129848.html
Sent from the Elecraft mailing list archive at Nabble.com.

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Re: [Elecraft] Amplifier for K-2/10

[Don Wilhelm]

Ron,

Your best bet is a KPA100 - it couples with the K2 and everything is 
automatic in operation.  I recall that the FCC requires amplifiers which 
operate with  less than 50 watts input to be sold legally in the US, so 
you do not see many amplifiers with 100 watts out and 5 or 10 watts in 
that can operate in the 25 MHz region - remember the CB amplifer problems.

However, if a linear amplifier is capable of 500 or 600 watts output 
with 50 or 60 watts input, then it should produce about 100 watts out 
with 10 watts in.  So if you have such a linear amp already, hook it 
up.  You can use the N0SS amp keying kit or the WA6HHQ amp keying 
circuit shown on the Elecraft website - Builders Resource page - 
Application Notes.

Your other possibility is to homebrew an amplifier.  If you have tubes, 
a pair of 6146s or 807s or 1625s would do the job and require a lot less 
than 10 watts drive (assuming grid driven).  There are several amplifier 
kits available, but many are the amp only and do not include low pass 
filters nor T/R switching.

If you have the K60XV option in your K2 (Sorry, but I can't remember), 
there is an amp keying circuit on that board already, all you would need 
is a jack to bring it out.

73,
Don W3FPR  

KM4VX wrote:
 I know about the KPA/100 option for the K-2, but wonder if there are any
 alternatives for obtaining 100 watts output or better from the K-2. I am
 looking for an amplifier that might produce 100 watts or better with an
 input of only 10 watts from the K-2. If anyone knows of one out there it
 would be interesting to have that information posted here. I would find a
 separate amplifier unit more convenient than an internal upgrade to the K-2.
 Thanks. KM4VX
   
 


 No virus found in this incoming message.
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 05:53:00

   
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Re: [Elecraft] Amplifier for K-2/10

[Frank Ross W4NHJ]

Try http://www.communication-concepts.com/

I built one of their 140 watt amps for a 20 meter HB SSB rig.  I only have 
it configured for one band, 20 meters, but left room to add filters for all 
HF bands.  It works great.

Frank - W4NHJ

- Original Message - 
From: KM4VX ronce...@earthlink.net
To: elecraft@mailman.qth.net
Sent: Sunday, June 21, 2009 4:32 PM
Subject: [Elecraft] Amplifier for K-2/10



 I know about the KPA/100 option for the K-2, but wonder if there are any
 alternatives for obtaining 100 watts output or better from the K-2. I am
 looking for an amplifier that might produce 100 watts or better with an
 input of only 10 watts from the K-2. If anyone knows of one out there it
 would be interesting to have that information posted here. I would find a
 separate amplifier unit more convenient than an internal upgrade to the 
 K-2.
 Thanks. KM4VX
 -- 
 View this message in context: 
 http://n2.nabble.com/Amplifier-for-K-2-10-tp3129848p3129848.html
 Sent from the Elecraft mailing list archive at Nabble.com.

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Re: [Elecraft] Amplifier for K-2/10

[Leigh L. Klotz, Jr WA5ZNU]

See http://www.hfprojectsyahoo.com/
Leigh/WA5ZNU
 I know about the KPA/100 option for the K-2, but wonder if there are any
 alternatives for obtaining 100 watts output or better from the K-2. I am
 looking for an amplifier that might produce 100 watts or better with an
 input of only 10 watts from the K-2. If anyone knows of one out there it
 would be interesting to have that information posted here. I would find a
 separate amplifier unit more convenient than an internal upgrade to the K-2.
 Thanks. KM4VX
   

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Re: [Elecraft] Amplifier for K-2/10

[K2ZR]

Leigh,
I've asked this question recently but have not received and responses. 
Perhaps there are a couple of folks out there that have found a 
compatible amp that can provide 100W or a bit more. QSK would be a FB 
added attraction.
Dick, K2ZR

Leigh L. Klotz, Jr WA5ZNU wrote:

See http://www.hfprojectsyahoo.com/
Leigh/WA5ZNU
  

I know about the KPA/100 option for the K-2, but wonder if there are any
alternatives for obtaining 100 watts output or better from the K-2. I am
looking for an amplifier that might produce 100 watts or better with an
input of only 10 watts from the K-2. If anyone knows of one out there it
would be interesting to have that information posted here. I would find a
separate amplifier unit more convenient than an internal upgrade to the K-2.
Thanks. KM4VX
  



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