[Elecraft] PTT keying a KXPA100 with a K2

[Don Wilhelm]

Luc and all,

I have been informed that simply clicking the link I sent may give a 404 
error because somehow a period is picked up as part of the link.
Simply remove the period and it will work fine.

73,
Don W3FPR

On 12/13/2020 12:13 PM, Don Wilhelm wrote:
> Luc,
> 
> The short answer is that will not work.
> 
> What you need is an open circuit on receive and a short to ground during 
> transmit.
> 
> Take a look at the K2(BASIC) External T-R Relay Driver on Tom Hammond's 
> (SK) website http://www.mmccs.com/mmarc/n0ss/index_k2.html.  Kits are 
> now available from Dave W8FGU dave at w8fgu.com, but the circuit is easy to 
> build on perfboard - just follow the full size layout Tom put into his 
> instructions.  I have done that several times.
> 
> 73,
> Don W3FPR
> 
> On 12/13/2020 5:57 AM, Luc Favre wrote:
>> Hi,
>> I own a QRP-K2 with the KIO2 installed.
>> I want to PTT key a KXPA100 (not KPA100).
>> May I connect Pin9 from KIO2 (8V in receive mode and 0V in transmit 
>> mode) directly with the PTT-IN connector on the KXPA100 (5V receive, 0 
>> V transmit) ? Maybe with a diode (cathode KIO2, anode KXPA100) ?
>> Thank you for advice
>> 73
>> Luc F6HJO/HB9ABB