[Heathkit] DX-60 PTT

[Bwana Bob]

Harry:

The PTT design that I use operates the keying line, not the HV, though 
the relay also disconnects and grounds the screen of the final when in 
receive. This keeps the final tube from generating "diode noise" which 
can show up in the receiver. It also keeps the modulator from causing 
the tube to draw current in the presence of stray sounds in the shack 
while receiving.

				73,

				Bob WB2VUF

Harry Vaught wrote:

> The one PTT schematic I've found keys the high-voltage supply same as 
> the Function switch.
> 
> Is there any reason I can't implement PTT by shorting R2 as is done by 
> the CW key?  Is there a problem with leaving the audio and modulator 
> stages up, running and connected to the final while the PA is biased off?
> 
> Harry, KT4AE
> Maryville, Tennessee
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF        ** For Assistance: 
> dfischer at usol.com **         $$ See the vintage area on the HCI web site 
> - http://www.w9wze.org $$ Heathkit mailing list
> Heathkit at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/heathkit
>