[Heathkit] DX-60 PTT

[Robert & Linda McGraw K4TAX]

My implementation is to insert a NO relay in series with the KEY jack.  A 
second set of NO contacts is wired in series with the AC line that goes to 
the AUX connector on the rear for switching the antenna relay.  The relay is 
a DPST configuration with a 6VDC coil.  I derive the 6V DC from a 1/2 wave 
rectifier being a diode and a capacitor operating off of the heater circuit. 
I change the mike connector to a 1/4" stereo phone jack with the ring being 
audio and the tip being PTT.  The + from the 6V DC supply goes to one coil 
terminal of the relay and the other coil terminal goes to the new 1/4" phone 
jack tip.   Do put a counter EMF diode {1N4001}  across the relay coil.  The 
relay is a small Radio Shack  relay mounted under the chassis with a dab of 
silicone.  The rectifier diode is a 1N4001 and the filter cap is a 100 MFD 
at 35V DC.

Operationally the function switch is placed in the mode you with to operate. 
Key the PTT to ground to transmit.

73
Bob, K4TAX


----- Original Message ----- 
From: "Harry Vaught" <hlv at frozenlady.com>
To: <heathkit at mailman.qth.net>
Sent: Tuesday, April 25, 2006 7:30 AM
Subject: [Heathkit] DX-60 PTT


> 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
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