Elecraft

K2 Push To Talk

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Lloyd Korb-3

K2 Push To Talk

Has anyone come up with a simple fix to add an external PTT line to the K2?

I recently picked up a used K2 and just completed building a 222
transverter. I didn't realize that the K2 does not have a Transmit/Receive
switch. So, I will be hot switching, in CW mode. WSJT is not a problem as
there is a built in delay between when PTT and audio is outputted.

An external sequencer won't help as I can't get control of the K2 PTT line
in CW mode.

Any ideas besides W3FPR's fix?
http://www.w3fpr.com/ptt_input_for_the_elecraft_k2.htm

Thanks,

Lloyd K8DIO
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Don Wilhelm-4

Re: K2 Push To Talk

Lloyd,

If you don't like my fix for this situation, you can use a footswitch to
activate your amp and switch your preamp off-line before hitting the
paddles - just don't make any mistakes and get things in the wrong order.

I have not seen anything comparable to my solution. It was intended
specifically for those using VHF gear with the K2.

73,
Don W3FPR

On 1/24/2014 11:12 PM, Lloyd Korb wrote:

> Has anyone come up with a simple fix to add an external PTT line to the K2?
>
> I recently picked up a used K2 and just completed building a 222
> transverter. I didn't realize that the K2 does not have a Transmit/Receive
> switch. So, I will be hot switching, in CW mode. WSJT is not a problem as
> there is a built in delay between when PTT and audio is outputted.
>
> An external sequencer won't help as I can't get control of the K2 PTT line
> in CW mode.
>
> Any ideas besides W3FPR's fix?
> http://www.w3fpr.com/ptt_input_for_the_elecraft_k2.htm
>
> Thanks,
>
>

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Dave-7

Re: K2 Push To Talk

Another solution for this, at least for CW, is to get a WinKeyerUSB.
Those have two outputs, a PTT and a Key line. There is a variable,
programmable, delay between when PTT is activated and when the Key
line becomes active.

I use the PTT to key my amp and 30 mS later key the K2. The delay can
be made very long, up to at least 990 mS, in 10 mS increments.

73 de dave
ab9ca/4

On 1/24/14 11:43 PM, Don Wilhelm wrote:

> Lloyd,
>
> If you don't like my fix for this situation, you can use a footswitch
> to activate your amp and switch your preamp off-line before hitting
> the paddles - just don't make any mistakes and get things in the wrong
> order.
>
> I have not seen anything comparable to my solution. It was intended
> specifically for those using VHF gear with the K2.
>
> 73,
> Don W3FPR
>
> On 1/24/2014 11:12 PM, Lloyd Korb wrote:
>> Has anyone come up with a simple fix to add an external PTT line to
>> the K2?
>>
>> I recently picked up a used K2 and just completed building a 222
>> transverter. I didn't realize that the K2 does not have a
>> Transmit/Receive
>> switch. So, I will be hot switching, in CW mode. WSJT is not a
>> problem as
>> there is a built in delay between when PTT and audio is outputted.
>>
>> An external sequencer won't help as I can't get control of the K2
>> PTT line
>> in CW mode.
>>
>> Any ideas besides W3FPR's fix?
>> http://www.w3fpr.com/ptt_input_for_the_elecraft_k2.htm
>>
>> 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
>

Steve Kavanagh

Re: K2 Push To Talk

In reply to this post by Lloyd Korb-3

Lloyd

One option for the K2/transverter hot switching problem on CW is to build a sequencer which breaks the TX IF line, like this one:

http://www.qsl.net/ve3sma/3OutputSequencerForK2.pdf

This only works, however, if you are running very low IF power from the K60XV (or at least run the 10W TX IF through an attenuator so the K2 PA sees a decent match at all times).

73,
Steve VE3SMA
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