[Elecraft] K1/KX1 connection with small amplifiers...ideas?

[Paul Christensen]

Some simple, inexpensive and high-performance kits similar to Tom's design:

http://wb9kzy.com/keyall.htm

http://tinyurl.com/4x932a9

Paul, W9AC


----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: "VK7JB" <zendoc at netspace.net.au>
Cc: <elecraft at mailman.qth.net>
Sent: Wednesday, July 27, 2011 9:28 AM
Subject: Re: [Elecraft] K1/KX1 connection with small amplifiers...ideas?


> John,
>
> You can use the amp keying circuit described for the K2 on the Elecraft
> website http://www.elecraft.com/Apps/Amp_keying_ckt.htm.  With the K1,
> you would use the 6R signal line in the K1 to drive it.
>
> If your amp relay voltage is higher (or the current required is higher)
> than can be handled by a 2N2222, take a look at the circuit used by Tom
> Hammond at http://www.n0ss.net/k2_t-r_rly_drvr.pdf.  Unfortunately, Tom
> cannot supply kits at this time, but it is not difficult to construct
> this circuit on perfboard.
>
> 73,
> Don W3FPR
>
> On 7/26/2011 10:20 PM, VK7JB wrote:
>> Hi All,
>>
>> I have a K1 and also a cute, but rugged, little Tokyo HP-45b amp, which 
>> puts
>> out about 45W and I take it camping.  I've been thinking of pairing the 
>> two.
>> The THP amp doesn't have RF sensing for switching.  Can anyone point me 
>> in
>> the direction of a simple way to key the amp with a K1 / KX1?  Are there 
>> amp
>> keying buffer circuits you can make up and use with the K1/KX1?
>>
>> Perhaps someone out there has done this successfully already.  I can't 
>> find
>> much in the archives, so perhaps others have worked out that it's not 
>> worth
>> the fuss?! :)
>>
>> Thanks!
>>
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