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K1/KX1 connection with small amplifiers...ideas?

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VK7JB

K1/KX1 connection with small amplifiers...ideas?

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!

John
VK7JB
K1 #2822, K2/100 #6998, #K3 5102

Don Wilhelm-4

Re: 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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P.B. Christensen

Re: K1/KX1 connection with small amplifiers...ideas?

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" <[hidden email]>
To: "VK7JB" <[hidden email]>
Cc: <[hidden email]>
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!
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html