Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Wes Stewart]

12

On 2/23/2017 3:42 PM, Harry Yingst via Elecraft wrote:

If I recall the 100w PA switches on when you go over 10w


__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Bill Frantz]

Don makes an excellent point.

I started with a minimal K3 and built it out "under the XYL's 
radar", enjoying it every step of the upgrade path. The second 
receiver was the killer upgrade for trying to work DX with big 
pileups. (I already had the P3.)


The other big advantage of the modular approach is the ability 
to install a improved board in an old radio, bringing it close 
to the latest and greatest. The new synthesizer board is a great example.


73 Bill AE6JV

On 2/23/17 at 6:53 AM, donw...@embarqmail.com (Don Wilhelm) wrote:

Historically, Elecraft has always offered options - on the 
premise that "if you don't need/want it, you don't have to buy it".
As a result, the KPA3, KAT3, Bandpass filters for general 
coverage, 2nd receiver, DVR, extra roofing filters are optional.


For instance, those who want a transceiver only to drive 
VHF/UHF transceivers do not want to buy the 100 watt PA, nor 
the KAT3.  Those who operate only QRP levels can pay for a K3S 
without the KPA3.


Certainly, it makes customizing your order a bit more involved, 
but you end up with a transceiver that is tailored to your 
needs and operating preferences.

---
Bill Frantz| Privacy is dead, get over| Periwinkle
(408)356-8506  | it.  | 16345 
Englewood Ave
www.pwpconsult.com |  - Scott McNealy | Los Gatos, 
CA 95032


__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Harry Yingst via Elecraft]

If I recall the 100w PA switches on when you go over 10w

  From: "j...@kk9a.com" <j...@kk9a.com>
 To: Jim Miller <j...@jtmiller.com> 
Cc: Elecraft Reflector <elecraft@mailman.qth.net>; jtmille...@gmail.com
 Sent: Thursday, February 23, 2017 5:31 PM
 Subject: Re: [Elecraft] Product Idea - 25 Watt PA for the K3
   
Maybe so. I think it would be nice if you could control when the 100w PA
switches on or perhaps just have it one all of the time. 

John KK9A 

On 2017-02-23 09:50, Jim Miller wrote:

> I'll take a guess. 
> 
> All transmitters have multiple stages to get to 100-200 watts. Tapping off 
> the 10w stage was easy to do and makes a nice QRP rig. I used my K3 for 
> several years as QRP only before getting the 100w amp and eventually the 
> KPA/KAT combo. 
> 
> jim ab3cv 
> 
> On Thu, Feb 23, 2017 at 9:32 AM, j...@kk9a.com <j...@kk9a.com> wrote:
> 
>> I am a little late to the Elecraft party, why does this transceiver use a
>> separate 100 watt module instead of just having a 100 to 200 watt
>> transmitter like other manufactures?
>> 
>> John KK9A
>> 
>> Harry Yingst
>> 
>> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
>> full output (500 watts) It got me thinking about a 25 watt PA Option.
>> Would it be possible to replace the existing 10 watt PA board with a 25
>> watt PA board that would use a larger heatsink instead of the case.
>> 
>> If the stock Filters and Relays can handle the 25 watts it would seem that
>> it would be a more inexpensive option for those who plan on going with the
>> KPA500.
>> 
>> Just a thought...
>> 
>> __
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft [1]
>> Help: http://mailman.qth.net/mmfaq.htm [2]
>> 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 j...@jtmiller.com

  

Links:
--
[1] http://mailman.qth.net/mailman/listinfo/elecraft
[2] http://mailman.qth.net/mmfaq.htm
__
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 hlyin...@yahoo.com


   
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[john]

Maybe so. I think it would be nice if you could control when the 100w PA
switches on or perhaps just have it one all of the time. 

John KK9A 

On 2017-02-23 09:50, Jim Miller wrote:

> I'll take a guess. 
> 
> All transmitters have multiple stages to get to 100-200 watts. Tapping off 
> the 10w stage was easy to do and makes a nice QRP rig. I used my K3 for 
> several years as QRP only before getting the 100w amp and eventually the 
> KPA/KAT combo. 
> 
> jim ab3cv 
> 
> On Thu, Feb 23, 2017 at 9:32 AM, j...@kk9a.com  wrote:
> 
>> I am a little late to the Elecraft party, why does this transceiver use a
>> separate 100 watt module instead of just having a 100 to 200 watt
>> transmitter like other manufactures?
>> 
>> John KK9A
>> 
>> Harry Yingst
>> 
>> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
>> full output (500 watts) It got me thinking about a 25 watt PA Option.
>> Would it be possible to replace the existing 10 watt PA board with a 25
>> watt PA board that would use a larger heatsink instead of the case.
>> 
>> If the stock Filters and Relays can handle the 25 watts it would seem that
>> it would be a more inexpensive option for those who plan on going with the
>> KPA500.
>> 
>> Just a thought...
>> 
>> __
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft [1]
>> Help: http://mailman.qth.net/mmfaq.htm [2]
>> 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 j...@jtmiller.com

  

Links:
--
[1] http://mailman.qth.net/mailman/listinfo/elecraft
[2] http://mailman.qth.net/mmfaq.htm
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Edward R Cole]

I originally purchased a K3/10 which limits output at 12w (how 
linear?).  Then a year ago I bought the KXPA100 which drives to 100w 
with about 5w which is 42% of max output and should be much more 
linear out of the K3.  I haven't determined the drive required for 
25w output from the KXPA100 but is probably down near 2-3w.  I run 
11w on 6m to drive a Harris 1kW amp and run the K3 at 1.3w and use 
the 3-dB attn input to the KXPA100 to get down to 11w.


I'm not running SSB so linearity is less important though JT65a still 
wants a linear amp (6m 1kW is for eme which is digital).


At some point I want to run 6m-SSB and thinking to run with 500w 
measured carrier output; that would realize 1000w PEP and stay under 
the 1600w limit of the Harris.  I do not run the Harris on SSB 
currently due to the five fans making too much audio noise in the 
shack for an open mic (I plan to remotely install the amp at the 
tower base next summer).


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


__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Harry Yingst via Elecraft]

That's surprising.

The most I need its 20 watts to get 500 watts out





  From: Jim Miller <j...@jtmiller.com>
 To: donw...@embarqmail.com 
Cc: Elecraft Reflector <elecraft@mailman.qth.net>; "j...@kk9a.com" 
<j...@kk9a.com>
 Sent: Thursday, February 23, 2017 9:59 AM
 Subject: Re: [Elecraft] Product Idea - 25 Watt PA for the K3
   
And 25w isn't sufficient to drive the KPA to full power on all bands.

jim ab3cv

On Thu, Feb 23, 2017 at 9:53 AM, Don Wilhelm <donw...@embarqmail.com> wrote:

> John,
>
> Historically, Elecraft has always offered options - on the premise that
> "if you don't need/want it, you don't have to buy it".
> As a result, the KPA3, KAT3, Bandpass filters for general coverage, 2nd
> receiver, DVR, extra roofing filters are optional.
>
> For instance, those who want a transceiver only to drive VHF/UHF
> transceivers do not want to buy the 100 watt PA, nor the KAT3.  Those who
> operate only QRP levels can pay for a K3S without the KPA3.
>
> Certainly, it makes customizing your order a bit more involved, but you
> end up with a transceiver that is tailored to your needs and operating
> preferences.
>
> 73,
> Don W3FPR
>
> On 2/23/2017 9:32 AM, j...@kk9a.com wrote:
>
>> I am a little late to the Elecraft party, why does this transceiver use a
>> separate 100 watt module instead of just having a 100 to 200 watt
>> transmitter like other manufactures?
>>
> __
> 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 j...@jtmiller.com
>
__
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 hlyin...@yahoo.com


   
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Eric Swartz - WA6HHQ, Elecraft]

That is correct. While typically in the 25-35 W range, It can require up to the 
low 40 W range in some cases.


Eric
/elecraft.com/

On 2/23/2017 6:59 AM, Jim Miller wrote:

And 25w isn't sufficient to drive the KPA to full power on all bands.

jim ab3cv

On Thu, Feb 23, 2017 at 9:53 AM, Don Wilhelm  wrote:


John,

Historically, Elecraft has always offered options - on the premise that
"if you don't need/want it, you don't have to buy it".
As a result, the KPA3, KAT3, Bandpass filters for general coverage, 2nd
receiver, DVR, extra roofing filters are optional.

For instance, those who want a transceiver only to drive VHF/UHF
transceivers do not want to buy the 100 watt PA, nor the KAT3.  Those who
operate only QRP levels can pay for a K3S without the KPA3.

Certainly, it makes customizing your order a bit more involved, but you
end up with a transceiver that is tailored to your needs and operating
preferences.

73,
Don W3FPR

On 2/23/2017 9:32 AM, j...@kk9a.com wrote:


I am a little late to the Elecraft party, why does this transceiver use a
separate 100 watt module instead of just having a 100 to 200 watt
transmitter like other manufactures?


__
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 j...@jtmiller.com


__
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 eric.swa...@elecraft.com


__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[w7aqk]

I think this issue of distortion when driving amps at near their limit was 
highlighted early on by a change Elecraft made on the K3.  Initially the K3 
could be dialed up to 110 watts.  However, IMD got pretty rough at that 
level.  So, Elecraft dropped the maximum down to just 100 watts, and the 
difference was quite noticeable.  I tend to run my K3 (when operating 
barefoot) at only about 90 watts hoping I'm doing even better.


I can, and have, run my KPA500 just using a KX3 or KX2 to drive it. 
However, that means cranking the little rigs up near maximum to get much out 
of the bigger amp.  I suspect that is a problem as to IMD.  If I put a 
KXPA100 in between, I also suspect I am much better off in that department. 
So, if I want to play with the little rigs and the big amp, I put the 
KXPA100 in the mix.  As best as I can tell, everything stays pretty 
"linear".  The little rigs only need a few watts to drive the KXPA100, and 
the KXPA100 only needs about 25 watts to drive the KPA500.  Convoluted 
perhaps, but kind of fun to play with.  It does minimize what I have 
directly in front of me on the desk.  I love my K3, but there are 
times/situations when I don't need everything it gives me.


Dave W7AQK


__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Jim Miller]

And 25w isn't sufficient to drive the KPA to full power on all bands.

jim ab3cv

On Thu, Feb 23, 2017 at 9:53 AM, Don Wilhelm  wrote:

> John,
>
> Historically, Elecraft has always offered options - on the premise that
> "if you don't need/want it, you don't have to buy it".
> As a result, the KPA3, KAT3, Bandpass filters for general coverage, 2nd
> receiver, DVR, extra roofing filters are optional.
>
> For instance, those who want a transceiver only to drive VHF/UHF
> transceivers do not want to buy the 100 watt PA, nor the KAT3.  Those who
> operate only QRP levels can pay for a K3S without the KPA3.
>
> Certainly, it makes customizing your order a bit more involved, but you
> end up with a transceiver that is tailored to your needs and operating
> preferences.
>
> 73,
> Don W3FPR
>
> On 2/23/2017 9:32 AM, j...@kk9a.com wrote:
>
>> I am a little late to the Elecraft party, why does this transceiver use a
>> separate 100 watt module instead of just having a 100 to 200 watt
>> transmitter like other manufactures?
>>
> __
> 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 j...@jtmiller.com
>
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Don Wilhelm]

John,

Historically, Elecraft has always offered options - on the premise that 
"if you don't need/want it, you don't have to buy it".
As a result, the KPA3, KAT3, Bandpass filters for general coverage, 2nd 
receiver, DVR, extra roofing filters are optional.


For instance, those who want a transceiver only to drive VHF/UHF 
transceivers do not want to buy the 100 watt PA, nor the KAT3.  Those 
who operate only QRP levels can pay for a K3S without the KPA3.


Certainly, it makes customizing your order a bit more involved, but you 
end up with a transceiver that is tailored to your needs and operating 
preferences.


73,
Don W3FPR

On 2/23/2017 9:32 AM, j...@kk9a.com wrote:

I am a little late to the Elecraft party, why does this transceiver use a
separate 100 watt module instead of just having a 100 to 200 watt
transmitter like other manufactures?

__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Jim Miller]

I'll take a guess.

All transmitters have multiple stages to get to 100-200 watts. Tapping off
the 10w stage was easy to do and makes a nice QRP rig. I used my K3 for
several years as QRP only before getting the 100w amp and eventually the
KPA/KAT combo.

jim ab3cv

On Thu, Feb 23, 2017 at 9:32 AM, j...@kk9a.com  wrote:

> I am a little late to the Elecraft party, why does this transceiver use a
> separate 100 watt module instead of just having a 100 to 200 watt
> transmitter like other manufactures?
>
> John KK9A
>
> Harry Yingst
>
> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
> full output (500 watts) It got me thinking about a 25 watt PA Option.
> Would it be possible to replace the existing 10 watt PA board with a 25
> watt PA board that would use a larger heatsink instead of the case.
>
> If the stock Filters and Relays can handle the 25 watts it would seem that
> it would be a more inexpensive option for those who plan on going with the
> KPA500.
>
> Just a thought...
>
> __
> 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 j...@jtmiller.com
>
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[j...@kk9a.com]

I am a little late to the Elecraft party, why does this transceiver use a
separate 100 watt module instead of just having a 100 to 200 watt
transmitter like other manufactures?

John KK9A

Harry Yingst

Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
full output (500 watts) It got me thinking about a 25 watt PA Option.
Would it be possible to replace the existing 10 watt PA board with a 25
watt PA board that would use a larger heatsink instead of the case.

If the stock Filters and Relays can handle the 25 watts it would seem that
it would be a more inexpensive option for those who plan on going with the
KPA500.

Just a thought...

__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[briancom]

Have you done the RF exposure calcs?  I have the same issues.  It turns out 
that on all HF bands, it is difficult to exceed the limits at 100 watts.  Just 
5 to 10 ft from the antenna provides enough distance.
73 de Brian K3KO


Sent from my iPad

> On Feb 22, 2017, at 10:06 PM, Aaron Lee  wrote:
> 
> I'm dealing with indoor and hidden antennas for the next few years, 25
> watts makes it much easier to stay within uncontrolled exposure limits
> than 100 watts. 25 watts is much more appropriate for my confined urban
> environment. It's also enough to have fun with the CW and digital modes
> I enjoy. I get nervous pushing my KX3 past 5 watts some of the 100% duty
> cycle digital modes. However, I would feel much more comfortable with a
> desktop rig that could push 25 watts all day long.*
> 
> Aaron Lee
> AC9OH
> 
> * Right now I'm debating between a 100 watt rig and trying to keep my
> fingers off of the power knob or saving my money in hopes that something
> better is on the market after I move.
> 
>> On Wed, Feb 22, 2017, at 03:25 PM, Harry Yingst via Elecraft wrote:
>> 
>> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
>> full output (500 watts) It got me thinking about a 25 watt PA Option. 
>> Would it be possible to replace the existing 10 watt PA board with a 25
>> watt PA board that would use a larger heatsink instead of the case.
>> 
>> If the stock Filters and Relays can handle the 25 watts it would seem
>> that it would be a more inexpensive option for those who plan on going
>> with the KPA500.
>> 
>> Just a thought...
>> 
>> 
>> 
>> 
>> __
>> 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 a...@aaronosaur.us
> __
> 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 als...@comcast.net

__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Erlend Grimseid]

+1 on this.
~25w, (optional) built in battery pack and tuner. Integration with the KX2
,KX3 and maybe the K2 and K3(S) for automatic band changing and so on. That
would be awesome.

73
LA4TTA
Erlend

2017-02-23 10:40 GMT+01:00 Myron Schaffer :

> In keeping with my purchasing habits (I own the K1/2 and KX line) I'd
> rather see a compact, efficient, external, 1 W in /25W out (14dB) packer
> type amp offered to compliment my very versatile station. Just saying.
>
> 72
> Myron WVØH
> Printed on Recycled Data
>
--
Erlend
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Myron Schaffer]

In keeping with my purchasing habits (I own the K1/2 and KX line) I'd rather 
see a compact, efficient, external, 1 W in /25W out (14dB) packer type amp 
offered to compliment my very versatile station. Just saying.

72
Myron WVØH
Printed on Recycled Data

> On Feb 23, 2017, at 1:00 AM, Rick WA6NHC <wa6...@gmail.com> wrote:
> 
> Excellent replies so far.
> 
> What we start with is a ten watt radio.  We add the KPA3, which provides a 
> jump in output by 10 db.  We can add the KPA500 which provides another ~12 
> db; because you're now loafing the KPA3, keeping linearity 'manageable'.  
> (Yes, you can push the KPA500 to 600 watts on many bands, but the IMD gives 
> less return on that power investment.)
> 
> This has been very successful as a model for Elecraft.  I don't see any need 
> for it to change (but without restarting another thread, a KPA1500 with a 
> KAT1500 matching tuner *would* be awesome).
> 
> If the user wants to run at 25 watts, use a K3(s)/100.  It's a simple macro, 
> computer command or knob twist to reach 25 watts and the signal will be 
> sparkling clean.  But I also note that if 25 watts was a hard limit, my 
> KPA500 could not be driven to full output on all bands, a couple require more 
> input.
> 
> Let's not mess with success... This is one case that fewer options (not 
> having a 25 watt amp at max OR having it biased into class A, using more 
> energy) is a good thing.
> 
> 73,
> 
> Rick wa6nhc
> 
> 
>> On 2/22/2017 8:30 PM, Cameron Francey wrote:
>> Thumbs up here to this reply!
>> 
>> Also, if you have 25 watts max from the rig then you limit your ability to 
>> reduce to 100 watts or less where its more than enough.
>> 
>> Remembering that we use the least amount of power needed to maintain the 
>> contact.  Just because the gas peddle goes as far as the floor doesn't mean 
>> it needs to be pushed that far to get to the shops!
>> 
>> 
>> Best regards,
>> 
>> Cameron -AF7DK/GM7LQR
>> 
>> 
>> 
>> From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Matthew Cook 
>> <vk...@bistre.net>
>> Sent: Wednesday, February 22, 2017 7:32 PM
>> To: Harry Yingst
>> Cc: Elecraft Reflector
>> Subject: Re: [Elecraft] Product Idea - 25 Watt PA for the K3
>> 
>> To make this idea work you need to make a 25Wpep amplifier that is kept in
>> it's linear region so that the IMD from this amplifier does not cause
>> problems in the output of the KPA500.
>> 
>> To make a class A-B 25W amplifier such as this with enough linearity will
>> result in you designing an amplifier capable of 100Wpep at full smoke.  The
>> non-linear nature of HF PA's is easily found on the net.  Having designed
>> PA's for HF manpacks a number of years ago we simply turned down our
>> 100Wpep design to 25Wpep and pocketed the performance increase at the
>> expense of cost.
>> 
>> The K3/100 at 25-35W has excellent linearity (highly likely by design, pat
>> designers on back for this one) which allows a more aggressive approach
>> within the KPA500 for grunt at the expense of "some" linearity.   You're
>> not increasing the cost of the KPA500 trying to eeek out every last bit of
>> linearity to get around the rubbish coming from the transceiver.
>> 
>> I'm keen to do some measurements in the near future of the SPE 1.3k-fa
>> amplifier being driven by a K3/10.  Having measured the IMD of my the
>> K3/100 at 10W (KPA3 disabled) recently I was a little surprised at the
>> result, it was not as clean as when driven at 30W with the KPA3 enabled.
>> I'd not be surprised to see some output degradation in the SPE from the
>> K3/10 c.f K3/100 driven at 20W with a -3dB inline attenuator.   This would
>> certainly explain some of the "wide" local signals that I've been seeing in
>> my SDR recently.
>> 
>> Engineering is always about compromise, and cascaded amplifiers are one of
>> the more trickier things to strike the right balance with.
>> 
>> 73
>> 
>> Matthew
>> VK5ZM
>> 
>> On 23 February 2017 at 07:55, Harry Yingst via Elecraft <
>> elecraft@mailman.qth.net> wrote:
>> 
>>> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
>>> full output (500 watts) It got me thinking about a 25 watt PA Option.
>>> Would it be possible to replace the existing 10 watt PA board with a 25
>>> watt PA board that would use a larger heatsink instead of the case.
>>> 
>>> If the stock Filters and Relays can handle the 25 watts it wo

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Rick WA6NHC]

Excellent replies so far.

What we start with is a ten watt radio.  We add the KPA3, which provides 
a jump in output by 10 db.  We can add the KPA500 which provides another 
~12 db; because you're now loafing the KPA3, keeping linearity 
'manageable'.  (Yes, you can push the KPA500 to 600 watts on many bands, 
but the IMD gives less return on that power investment.)


This has been very successful as a model for Elecraft.  I don't see any 
need for it to change (but without restarting another thread, a KPA1500 
with a KAT1500 matching tuner *would* be awesome).


If the user wants to run at 25 watts, use a K3(s)/100.  It's a simple 
macro, computer command or knob twist to reach 25 watts and the signal 
will be sparkling clean.  But I also note that if 25 watts was a hard 
limit, my KPA500 could not be driven to full output on all bands, a 
couple require more input.


Let's not mess with success... This is one case that fewer options (not 
having a 25 watt amp at max OR having it biased into class A, using more 
energy) is a good thing.


73,

Rick wa6nhc


On 2/22/2017 8:30 PM, Cameron Francey wrote:

Thumbs up here to this reply!

Also, if you have 25 watts max from the rig then you limit your ability to 
reduce to 100 watts or less where its more than enough.

Remembering that we use the least amount of power needed to maintain the 
contact.  Just because the gas peddle goes as far as the floor doesn't mean it 
needs to be pushed that far to get to the shops!


Best regards,

Cameron -AF7DK/GM7LQR



From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Matthew Cook 
<vk...@bistre.net>
Sent: Wednesday, February 22, 2017 7:32 PM
To: Harry Yingst
Cc: Elecraft Reflector
Subject: Re: [Elecraft] Product Idea - 25 Watt PA for the K3

To make this idea work you need to make a 25Wpep amplifier that is kept in
it's linear region so that the IMD from this amplifier does not cause
problems in the output of the KPA500.

To make a class A-B 25W amplifier such as this with enough linearity will
result in you designing an amplifier capable of 100Wpep at full smoke.  The
non-linear nature of HF PA's is easily found on the net.  Having designed
PA's for HF manpacks a number of years ago we simply turned down our
100Wpep design to 25Wpep and pocketed the performance increase at the
expense of cost.

The K3/100 at 25-35W has excellent linearity (highly likely by design, pat
designers on back for this one) which allows a more aggressive approach
within the KPA500 for grunt at the expense of "some" linearity.   You're
not increasing the cost of the KPA500 trying to eeek out every last bit of
linearity to get around the rubbish coming from the transceiver.

I'm keen to do some measurements in the near future of the SPE 1.3k-fa
amplifier being driven by a K3/10.  Having measured the IMD of my the
K3/100 at 10W (KPA3 disabled) recently I was a little surprised at the
result, it was not as clean as when driven at 30W with the KPA3 enabled.
I'd not be surprised to see some output degradation in the SPE from the
K3/10 c.f K3/100 driven at 20W with a -3dB inline attenuator.   This would
certainly explain some of the "wide" local signals that I've been seeing in
my SDR recently.

Engineering is always about compromise, and cascaded amplifiers are one of
the more trickier things to strike the right balance with.

73

Matthew
VK5ZM

On 23 February 2017 at 07:55, Harry Yingst via Elecraft <
elecraft@mailman.qth.net> wrote:


Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
full output (500 watts) It got me thinking about a 25 watt PA Option.
Would it be possible to replace the existing 10 watt PA board with a 25
watt PA board that would use a larger heatsink instead of the case.

If the stock Filters and Relays can handle the 25 watts it would seem that
it would be a more inexpensive option for those who plan on going with the
KPA500.

Just a thought...




__
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 vk...@bistre.net

__
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 cameronfranceyut...@hotmail.com
__
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: 

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[ab2tc]

Hi again,

If I could amplify that a bit further, no pun intended, if you can afford
the KPA500, you surely can afford the KPA3 option in the K3. And it is a
better driver option for the KPA500.

AB2TC - Knut


ab2tc wrote
> Hi,
> 
> Very good points indeed. I am not surprised at all that the KPA3 is much
> cleaner at 30W than the K3/10 is at 10W. At 25/30W it's loafing along
> close to its optimum IMD level and the "driver" (the KPA3/10) is loafing
> along at 3W or less. So let's face it, neither of these amplifiers are
> very linear at their rated full power levels. So please don't let KPA500
> users worsen their IMD levels by skimping on its driving source.
> 
> AB2TC - Knut 
> 





--
View this message in context: 
http://elecraft.365791.n2.nabble.com/Product-Idea-25-Watt-PA-for-the-K3-tp7627281p7627290.html
Sent from the Elecraft mailing list archive at Nabble.com.
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[ab2tc]

Hi,

Very good points indeed. I am not surprised at all that the KPA3 is much
cleaner at 30W than the K3/10 is at 10W. At 25/30W it's loafing along close
to its optimum IMD level and the "driver" (the KPA3/10) is loafing along at
3W or less. So let's face it, neither of these amplifiers are very linear at
their rated full power levels. So please don't let KPA500 users worsen their
IMD levels by skimping on its driving source.

AB2TC - Knut 


Matthew Cook wrote
> To make this idea work you need to make a 25Wpep amplifier that is kept in
> it's linear region so that the IMD from this amplifier does not cause
> problems in the output of the KPA500.
> 
> To make a class A-B 25W amplifier such as this with enough linearity will
> result in you designing an amplifier capable of 100Wpep at full smoke. 
> The
> non-linear nature of HF PA's is easily found on the net.  Having designed
> PA's for HF manpacks a number of years ago we simply turned down our
> 100Wpep design to 25Wpep and pocketed the performance increase at the
> expense of cost.
> 
> The K3/100 at 25-35W has excellent linearity (highly likely by design, pat
> designers on back for this one) which allows a more aggressive approach
> within the KPA500 for grunt at the expense of "some" linearity.   You're
> not increasing the cost of the KPA500 trying to eeek out every last bit of
> linearity to get around the rubbish coming from the transceiver.
> 
> I'm keen to do some measurements in the near future of the SPE 1.3k-fa
> amplifier being driven by a K3/10.  Having measured the IMD of my the
> K3/100 at 10W (KPA3 disabled) recently I was a little surprised at the
> result, it was not as clean as when driven at 30W with the KPA3 enabled.
> I'd not be surprised to see some output degradation in the SPE from the
> K3/10 c.f K3/100 driven at 20W with a -3dB inline attenuator.   This would
> certainly explain some of the "wide" local signals that I've been seeing
> in
> my SDR recently.
> 
> Engineering is always about compromise, and cascaded amplifiers are one of
> the more trickier things to strike the right balance with.
> 
> 73
> 
> Matthew
> VK5ZM
> 





--
View this message in context: 
http://elecraft.365791.n2.nabble.com/Product-Idea-25-Watt-PA-for-the-K3-tp7627281p7627289.html
Sent from the Elecraft mailing list archive at Nabble.com.
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Cameron Francey]

Thumbs up here to this reply!

Also, if you have 25 watts max from the rig then you limit your ability to 
reduce to 100 watts or less where its more than enough.

Remembering that we use the least amount of power needed to maintain the 
contact.  Just because the gas peddle goes as far as the floor doesn't mean it 
needs to be pushed that far to get to the shops!


Best regards,

Cameron -AF7DK/GM7LQR



From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Matthew Cook 
<vk...@bistre.net>
Sent: Wednesday, February 22, 2017 7:32 PM
To: Harry Yingst
Cc: Elecraft Reflector
Subject: Re: [Elecraft] Product Idea - 25 Watt PA for the K3

To make this idea work you need to make a 25Wpep amplifier that is kept in
it's linear region so that the IMD from this amplifier does not cause
problems in the output of the KPA500.

To make a class A-B 25W amplifier such as this with enough linearity will
result in you designing an amplifier capable of 100Wpep at full smoke.  The
non-linear nature of HF PA's is easily found on the net.  Having designed
PA's for HF manpacks a number of years ago we simply turned down our
100Wpep design to 25Wpep and pocketed the performance increase at the
expense of cost.

The K3/100 at 25-35W has excellent linearity (highly likely by design, pat
designers on back for this one) which allows a more aggressive approach
within the KPA500 for grunt at the expense of "some" linearity.   You're
not increasing the cost of the KPA500 trying to eeek out every last bit of
linearity to get around the rubbish coming from the transceiver.

I'm keen to do some measurements in the near future of the SPE 1.3k-fa
amplifier being driven by a K3/10.  Having measured the IMD of my the
K3/100 at 10W (KPA3 disabled) recently I was a little surprised at the
result, it was not as clean as when driven at 30W with the KPA3 enabled.
I'd not be surprised to see some output degradation in the SPE from the
K3/10 c.f K3/100 driven at 20W with a -3dB inline attenuator.   This would
certainly explain some of the "wide" local signals that I've been seeing in
my SDR recently.

Engineering is always about compromise, and cascaded amplifiers are one of
the more trickier things to strike the right balance with.

73

Matthew
VK5ZM

On 23 February 2017 at 07:55, Harry Yingst via Elecraft <
elecraft@mailman.qth.net> wrote:

>
> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
> full output (500 watts) It got me thinking about a 25 watt PA Option.
> Would it be possible to replace the existing 10 watt PA board with a 25
> watt PA board that would use a larger heatsink instead of the case.
>
> If the stock Filters and Relays can handle the 25 watts it would seem that
> it would be a more inexpensive option for those who plan on going with the
> KPA500.
>
> Just a thought...
>
>
>
>
> __
> 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 vk...@bistre.net
__
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 cameronfranceyut...@hotmail.com
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Matthew Cook]

To make this idea work you need to make a 25Wpep amplifier that is kept in
it's linear region so that the IMD from this amplifier does not cause
problems in the output of the KPA500.

To make a class A-B 25W amplifier such as this with enough linearity will
result in you designing an amplifier capable of 100Wpep at full smoke.  The
non-linear nature of HF PA's is easily found on the net.  Having designed
PA's for HF manpacks a number of years ago we simply turned down our
100Wpep design to 25Wpep and pocketed the performance increase at the
expense of cost.

The K3/100 at 25-35W has excellent linearity (highly likely by design, pat
designers on back for this one) which allows a more aggressive approach
within the KPA500 for grunt at the expense of "some" linearity.   You're
not increasing the cost of the KPA500 trying to eeek out every last bit of
linearity to get around the rubbish coming from the transceiver.

I'm keen to do some measurements in the near future of the SPE 1.3k-fa
amplifier being driven by a K3/10.  Having measured the IMD of my the
K3/100 at 10W (KPA3 disabled) recently I was a little surprised at the
result, it was not as clean as when driven at 30W with the KPA3 enabled.
I'd not be surprised to see some output degradation in the SPE from the
K3/10 c.f K3/100 driven at 20W with a -3dB inline attenuator.   This would
certainly explain some of the "wide" local signals that I've been seeing in
my SDR recently.

Engineering is always about compromise, and cascaded amplifiers are one of
the more trickier things to strike the right balance with.

73

Matthew
VK5ZM

On 23 February 2017 at 07:55, Harry Yingst via Elecraft <
elecraft@mailman.qth.net> wrote:

>
> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
> full output (500 watts) It got me thinking about a 25 watt PA Option.
> Would it be possible to replace the existing 10 watt PA board with a 25
> watt PA board that would use a larger heatsink instead of the case.
>
> If the stock Filters and Relays can handle the 25 watts it would seem that
> it would be a more inexpensive option for those who plan on going with the
> KPA500.
>
> Just a thought...
>
>
>
>
> __
> 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 vk...@bistre.net
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Ken Arck]

Seems to me that IMD might be noticeably worse that way


At 01:25 PM 2/22/2017, Harry Yingst via Elecraft wrote:
Seeing how the KPA- 500 tends to need less than 
25 watts to drive it to full output (500 watts) 
It got me thinking about a 25 watt PA 
Option.  Would it be possible to replace the 
existing 10 watt PA board with a 25 watt PA 
board that would use a larger heatsink instead 
of the case. If the stock Filters and Relays can 
handle the 25 watts it would seem that it would 
be a more inexpensive option for those who plan 
on going with the KPA500. Just a thought... 
__ 
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 k...@arcomcontrollers.com


--
President and CTO - Arcom Communications
Makers of repeater controllers and accessories.
http://www.arcomcontrollers.com/
Authorized Dealers for Kenwood and Telewave and
we offer complete repeater packages!
AH6LE/R - IRLP Node 3000
http://www.irlp.net
"We don't just make 'em. We use 'em!"

__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Aaron Lee]

I'm dealing with indoor and hidden antennas for the next few years, 25
watts makes it much easier to stay within uncontrolled exposure limits
than 100 watts. 25 watts is much more appropriate for my confined urban
environment. It's also enough to have fun with the CW and digital modes
I enjoy. I get nervous pushing my KX3 past 5 watts some of the 100% duty
cycle digital modes. However, I would feel much more comfortable with a
desktop rig that could push 25 watts all day long.*

Aaron Lee
AC9OH

* Right now I'm debating between a 100 watt rig and trying to keep my
fingers off of the power knob or saving my money in hopes that something
better is on the market after I move.

On Wed, Feb 22, 2017, at 03:25 PM, Harry Yingst via Elecraft wrote:
> 
> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to
> full output (500 watts) It got me thinking about a 25 watt PA Option. 
> Would it be possible to replace the existing 10 watt PA board with a 25
> watt PA board that would use a larger heatsink instead of the case.
> 
> If the stock Filters and Relays can handle the 25 watts it would seem
> that it would be a more inexpensive option for those who plan on going
> with the KPA500.
> 
> Just a thought...
> 
> 
> 
> 
> __
> 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 a...@aaronosaur.us
__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Phil Hystad]

Good idea.  I would have went for that if it was available.

73, phil, K7PEH


> On Feb 22, 2017, at 1:25 PM, Harry Yingst via Elecraft 
>  wrote:
> 
> 
> Seeing how the KPA- 500 tends to need less than 25 watts to drive it to full 
> output (500 watts) It got me thinking about a 25 watt PA Option. 
> Would it be possible to replace the existing 10 watt PA board with a 25 watt 
> PA board that would use a larger heatsink instead of the case.
> 
> If the stock Filters and Relays can handle the 25 watts it would seem that it 
> would be a more inexpensive option for those who plan on going with the 
> KPA500.
> 
> Just a thought...
> 
> 
> 
> 
> __
> 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 phys...@mac.com

__
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 arch...@mail-archive.com

Re: [Elecraft] Product Idea - 25 Watt PA for the K3

[Szabó István]

Harry I like this idea.

István, HA4ZD

__
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 arch...@mail-archive.com

[Elecraft] Product Idea - 25 Watt PA for the K3

[Harry Yingst via Elecraft]

Seeing how the KPA- 500 tends to need less than 25 watts to drive it to full 
output (500 watts) It got me thinking about a 25 watt PA Option. 
Would it be possible to replace the existing 10 watt PA board with a 25 watt PA 
board that would use a larger heatsink instead of the case.

If the stock Filters and Relays can handle the 25 watts it would seem that it 
would be a more inexpensive option for those who plan on going with the KPA500.

Just a thought...




__
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 arch...@mail-archive.com