[Johnson] T/R relay

[Dennis Deaton]

Jimmy,

I would only use a vacuum t/r relay only if you want to run QSK on CW. 
As others have said, the timing is critical in large plate-modulated 
transmitters such as the Desk KW. For timing issues, a great example of 
how the delay circuitry should be configured, I refer you to the t/r 
relay circuitry implemented in the Johnson KW Matchbox. It has delay 
circuitry specifically designed to handle large transmitters such as the 
Desk KW. You can build a similar delay circuit for the Dow Key. The KW 
Matchbox manual can be found on the BAMA website.

Dennis Deaton, WA6ACC


On 07/09/2013 10:24 AM, Jimmy Green wrote:
> I am setting up  my 75A4 and Johnson Desk KW. Please someone tell me should I use a Dowkey or a Vacum relay.If vacum, tell me how to size and how to connect. I know nothing about the vacum relay.
> Thank you in advance.
> Jimmy K5CSU
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