[Milsurplus] Need help with ART-13

[WA5CAB at cs.com]

As in several of the home-brew supplies, the original TCZ-1 and TCZ-2 
supplies did have a relay or contactor run off of the PTT circuit.  But remember 
that putting the mode switch on the transmitter into CW locks down most of 
that circuit.  So the time delay circuit keeps the HV primaries (or 
motor-generators) from being energized until whatever tubes are still present have 
time to warm up.

In a message dated 3/8/2011 8:01:07 PM Central Standard Time, 
hoopmonk at snet.net writes: 
> John,
>          Yes there is a relay actually mounted on the back side of the 
> P.S. 
> that is activated by the PPT. which sends HV to the set.
> Bob
> W1GTH
> 
> 
> ----- Original Message ----- 
> From: "J. Forster" <jfor at quik.com>
> To: "mac" <w7qho at aol.com>
> Cc: "BOB" <hoopmonk at snet.net>; "milsurplus" <milsurplus at mailman.qth.net>
> Sent: Tuesday, March 08, 2011 8:42 PM
> Subject: Re: [Milsurplus] Need help with ART-13
> 
> 
> >If this is the discussion I think it is, the delay tube was to allow the
> >filaments to heat up. The HV pimaries were driven directly from the delay
> >tube and its contacts kept failing. I think Bob is adding a contactor in
> >the delay tube circuit.
> >
> >I don't think the HV is controlled by the PTT, but I could be wrong. 
> Doing
> >that w3ould require an additional, low power relay.
> >
> >FWIW,
> >
> >-John
> >

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480