[Elecraft] PTT keying a KXPA100 with a K2

[Don Wilhelm]

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