[Milsurplus] ART 13 change over relay

[WA5CAB at cs.com]

Greg,

REF:
AN 08-30ART13-5 (later NAVWEPS 08-30ART13-5) for NT-52286 & T-47ART-13
AN 16-30ART13-4 for T-47A/ART-13
T.O. 12R2-2ART13-2 for T-47A/ART-13 & T-412/ART-13B

The antenna changeover is handled by the vacuum relay switch in the 
transmitter.  On the left end of the transmitter cabinet you will find a small 
insulated push-post labeled REC.  Run a lead from there to the receiver antenna 
terminal.  If you want to make that run in coax, connect the center 
conductor to the REC post and the shield to the nearby GND post.

The BC-348 and later production or MWO'd R-388 have mute terminals.  On the 
transmitter (ref the system wiring diagram in any of the manuals listed 
above), pins 23 and 24 in the 27-contact connector J-106 are across a pair of 
NC contacts in the main T/R relay.  

When properly connected, keying the transmitter mutes the receiver and 
transfers the antenna from the receiver to the transmitter.  There is no delay.  
Assuming that the receiver is capable of keeping up, the system is capable 
of full break-in CW operation.

In a message dated 10/31/2009 8:07:13 AM Central Standard Time, 
bluebirdtele at embarqmail.com writes: 
> 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
> 

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