[Milsurplus] Coil, Antenna Loading, TCS

[Hue Miller]

Purely by coincidence I happened to grab a random copy of
"Electron" from 1950 and read about the situation where
the TCS reception suffers from using the loading coil. The
article mentioned that the problem is not so serious when
using a different receiver instead of the TCS; their example
is the RBS, and they attribute the better result to the
RBS's higher sensitivity. This explanation seemed to me a
wee bit, well,  uh, questionable - at first guess, I would
have maybe guessed the RBS input Z is higher than the
TCS, but that's purely a guess, and maybe Electron is
correct.  The conclusion was that this was an "operational
complication". Oh well, I got up an fetched the article:
"TCS-15 U.S.S. Perch (ASSP-313)"  "The external loading
coil of this TCS equipment, when adjusted for optimum 
loading of the transmitter, was found to so far detune the
input to the receiver, as to cause a severe loss of signal
on the majority of operational frequencies......[excised
text, as described above].....Therefore the difficulties
are purely operational as full signal can be obtained
on RECEIVE by adjusting the loading coil between
transmit and receive in each transmission.....[yas, sic]
[ reminding me of a cartoon I saw once, in 73 Magazne?
"Break-In is Full Manual here, OM" ].....
"As the TCS is intended for standby only, it is 
recommended that another receiver be used in place of
the TCS receiver. The addition of a variable condenser 
of about 100 micro-microfarads maximum in series
with the antenna lead to the receiver and on the
receiver side of the antenna relay is suggested, if 
operation with the TCS receiver is desired. This would
tend to retune the system to optimum on receive."

Perch decommissioned 3 times; ultimately in 1971. Was
commissioned in 1944. Recommissioned  1948 as
Submarine Transport, carrying up to 75 Marines or
Special Forces teams on combat operations or
training exercises. 
http://en.wikipedia.org/wiki/USS_Perch_(SS-313)
via: Hue  Miller