[Elecraft] K3/K3S 10W models with KXPA100

[Ron D'Eau Claire]

The KXPA100 can handle 10 watts through the antenna switch receive path (TX
not enabled). It's not recommended because the TX switch can add more
harmonic energy when transmitting that way, but a slight mis-timing with a
foot or other switch won't hurt it. And 10 watts is enough for 100 watts
out. 

73, Ron AC7AC

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don
Wilhelm
Sent: Saturday, February 20, 2016 8:10 PM
To: george fritkin; lstavenhagen; El
Subject: Re: [Elecraft] K3/K3S 10W models with KXPA100

George,

A footswitch will work as long as you operate it before transmitting any RF.
I would prefer an amp keying circuit over a footswitch since there can be
occasions of human failure - "I hit the key (or mic PTT) before I activated
the footswitch".

73,
Don W3FPR

On 2/20/2016 9:58 PM, george fritkin wrote:
> Why not a foot switch
>
>
> George, W6GF
>
> On February 20, 2016, at 6:48 PM, Don Wilhelm <w3fpr at embarqmail.com>
wrote:
>
> LS,
>
> The KXPA100 will work with any QRP transceiver that produces a KEYOUT 
> signal.
> The K3/10, K3S/10 and the KX3 can do that, it is just a matter of a 
> proper cable.
>
> The K2/10 does not have a KEYOUT line (although the K2/100 does).  I 
> would recommend that you build the circuit shown on Tom Hammond N0SS
> (SK) website at http://www.mmccs.com/mmarc/n0ss/index_k2.html.
> Since Tom is SK, no boards are available, but the circuit is easy 
> enough to build on perfboard.  Just follow Tom's board layout which is 
> clearly identified full scale on his website and connect the wires.  
> If you have the capabilities for etching your own board, the process 
> is easy since Tom provided full scale images of his board.
> I have built several of the perfboard verions of that circuit and they 
> work fine.
>
> 73,
> Don W3FPR
>
> On 2/20/2016 9:25 AM, lstavenhagen wrote:
>> Hi all,
>> May be a bit silly of a question, but how well does the KXPA 100 work 
>> with the K3 or K3S 10W model? Reason I ask is I now have 3 10W rigs 
>> (K3, K3S and a K2) and may be building a 4th soon (another K2/10). 
>> And in the very rare event when do go QRO, it would probably be 
>> cheaper to just get one 100W amp to use with them all than 4 100W amp
modules for each.
>>
>> So my idea is a KXPA100 for my QRO ops with each one. So just curious 
>> how well this amp works with the K3 and K3S? I would imagine it'd be 
>> similar to using it with the K2 or ?
>>
>>
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