[Elecraft] K3/K3S 10W models with KXPA100

Don Wilhelm w3fpr at embarqmail.com
Sat Feb 20 23:09:33 EST 2016


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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