PTT keying a KXPA100 with a K2

[luc Favre-2]

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

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[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 [hidden email], 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
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[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 [hidden email], 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

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