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:
   [hidden email]

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[Elecraft mailing list]

I like that the K3 is modular so I buy the options I want (though it seems like I want all of them eventually).


I came pretty close to buying a second K3 and keeping it at 10 watts for use with Transverters (may still happen someday).

I'd like to see Elecraft update their Transverters to match the K3, It is nice to look across my desk and see matching gear.





      From: Don Wilhelm <[hidden email]>
 To: "[hidden email]" <[hidden email]>; [hidden email]
 Sent: Thursday, February 23, 2017 9:53 AM
 Subject: Re: [Elecraft] Product Idea - 25 Watt PA for the K3
   
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

   
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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, [hidden email] <[hidden email]> 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...
>>
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[Elecraft mailing list]

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

      From: "[hidden email]" <[hidden email]>
 To: Jim Miller <[hidden email]>
Cc: Elecraft Reflector <[hidden email]>; [hidden email]
 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, [hidden email] <[hidden email]> 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:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]

 

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[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, [hidden email] (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.

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[Wes Stewart-2]

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

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