[Milsurplus] More TBS Information

[jcoward5452 at aol.com]

I sold one of those filters at the MRCG meet either last year or the 
year before.By the looks of it ,it appeared to be an add on external to 
the TBS.
 Jay KE6PPF


-----Original Message-----
From: Rob Flory <robandpj at earthlink.net>
To: milsurplus <milsurplus at mailman.qth.net>
Sent: Fri, 11 Jan 2008 4:27 am
Subject: [Milsurplus] More TBS Information



Hi,

John Forster asked if the Low Pass Filter for the TBS was a later add 
on.  I'm
not sure, but it does not show in my Preliminary Instruction Book for 
TBS-6 of
1943.

On its use post war, here is a note from Bill Henneberry CWO, " In 1951 
and 1952
I was the squadron Chief ET for Mine Squadron Six, which consisted of 
six
converted destroyers.  All still used the TBS.  When I went to the 
Strickland, a
radar picket ship in the North Atlantic in 1956, we had the TDZ RDZ."

Study of the manual shows that the modulation limiter starts kicking in 
at 75
percent modulation, rectifying modulator output and feeding increased 
bias to
the speech amplifier with a long time constant such that at 10dB above 
the level
needed for 75 percent modulation, the modulation is 95 percent.

Rob Flory

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