[Milsurplus] A TCS Transmitter Wiring Mystery

B. Smith smithab11 at comcast.net
Thu May 2 21:16:38 EDT 2013


What I would request is that those members of the list who have TCS 
transmitters take a look at how the loading coil(L-108) is wired on 
their sets , - - -  is  the front (end nearest the front panel) wired to 
S-103 or is the "rear" of the loading coil connected to S-103? Lets us 
know the series and if  possible the serial number. You will have to 
remove the set from its cabinet and turn it over.     :-)
Look at the photos and info on my page at:
http://k4che.com/TCS%20equipment/Loading%20coil%20Mystery/Loading%20Coil%20Wiring.htm





On 4/30/2013 11:26 PM, WA5CAB at cs.com wrote:
> Breck,
>
> The roller inductor itself changed (mechanically) around TCS-10.  
> However, I don't see any effective electrical change in any of the 
> manuals from TCS through TCS-15.  All schematics show L-108 connected 
> between the hot side of the variometer and the capacitor selector switch.
>
> Relocation of the RF Ammeter from the ground side of the variometer to 
> the antenna post occurred at Serial Number 9363 of TCS-12 production.  
> G3VKM has reported finding a Change Sheet in his PIB-TCS-13 showing 
> that the change occurred from S/N 1387 in that model.  The PIB-TCS-13 
> and PIB-14 originals that I have both show the later RFA wiring on the 
> transmitter schematic, with no Change note as found on the transmitter 
> schematic in NAVSHIPS 900,291 covering TCS-7,9,10,11,12. However, the 
> schematic in the PIB-TCS-13 is REV A and the one in PIB-TCS-14 is REV 
> C.  No document has yet been located that shows what S/N the change 
> occurred at in TCS-14.
>
> None of the documents give any explanation for the change.
>
> In a message dated 04/30/2013 16:30:50 PM Central Daylight Time, 
> smithab11 at comcast.net writes:
>> A TCS Transmitter  Mystery?
>>
>>   Why is the Antenna Loading Coil L108 wired differently on different
>> TCS  series transmitters ?
>> On my TCS-9 transmitter L-108 is wired different from my TCS-13. Was
>> this change in wiring only for the TCS-13 or was it introduced in other
>> earlier series of TCS transmitters following the TCS-9?
>> What happens to the "Typical  Dial  Setting"  charts with these wiring
>> changes?
>>
>> I think I may have a possible answer  to the wiring differences but
>> present several photos and questions at:
>> http://k4che.com/TCS%20equipment/Loading%20coil%20Mystery/Loading%20Coil%20Wiring.htm
>>
>> k4che
>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480 



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