[MRCA] TCS 5 Transmitter

[Christopher Bowne]

As I recall, there is a double pole contact on one of the T/R relays in the trasnsmitter that shifts the low voltage B plus between the receiver and the transmitter, it would normally be routed to the receiver in the key up condition.  I can't remember any other means of receiver muting being used.  I made a small modification to my TCS-12s sets that keys a small added 12V DC coil relay  with its contacts in series with the voltage feed to the MO and final screens to key the transmittter, when I  manually lock the existing T/R relays in the ttransmit state using the otherwise unused power switch on the transmitter front panel.   This eliminates all of the big antenna relay clatter while keying, the way I arranged it allows me to key everything as per the orignal arrangement with the power switch in the off condition, or when using a PTT mic in voice mode.  The power switch leads run directly to the transmitter multipin front panel connector, they
 normally were used to turn the transmitter portion external power supply on and off.  If perform that function with the power switches on the system remote control unit (RCU) that has power switches for the transmitter, receiver, and the spealer in the RCU, along with the speaker volume control.

Saw you also picked up a nice dual dyno TCS power unit at Deerfield - good luck with that, would be interested in finding out if the radios run any differently on it vs the big AC supply.  I have  (what was in 1988)  a brand new in the packaging  dual dyno supply to run my TCS-12s, think I bought it from a bunch August Link had for sale back then.

What did you have to do to get the TCS-13 receiver going, it seemed pretty dead to me!  Would be interested in seeing how you can get that front panel cleaned up!  



On Tuesday, October 14, 2014 8:12 PM, "w1aea at myfairpoint.net" <w1aea at myfairpoint.net> wrote:
 




 Hi all  A TCS-5 Transmitter followed my Home from Near-Fest over the weekend,  As I go thru it and check things which are nearly inline I find that the thing Keeps My TCS-13 Rx  Muted all the time???  I expect there might be a small difference in this Earlier Transmitter Than the TCS-12 I'm using! But I don't seem to be able to find a   TCS-5 Schematic??  anyone have any ideas??  or a location of a Schematic for this Earlier  Tx??   This thing appears to be Unmolested??  thanks  Jeff W1AEA
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