[Milsurplus] ART 13 change over relay

[John Hutchins]

Greg -

I thought that there was a antenna change over unit TU??? AN/XXXX ? with 
a 28V coil relay that provided Antenna change over and extra contact 
pairs NO and NC  for receiver B+ or  Screen +  typically the BC-348 and 
R105/ARR-15 receivers?  Fast attack on transmit slow release on receive 
I would assume.
-Hutch

 


Greg Mijal wrote:
> Hi:
> My Shelby Hamfest  acquired ART 13  is close to completion.  My home made power supply is huge and heavy but can do the job.
> My question is: what is the tradional way to flip the antenna from the transmitter to the receiver and vice versa?  My guess is to use a relay wired to the primary of the plate supply transformer to control an antenna relay and mute contacts.  Is that about right?  The mating receiver will be a HQ 170, R 388 or possibly a Heathkit Mohawk.
> How did Uncle Sam do it in an aircraft back in the bad old days?
> Thanks
> Greg
> WA7LYO
> Kinston NC
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