[Milsurplus] ] LO radiation and the TBX

[Hue Miller]

----- Original Message ----- 
From: "Ray Fantini" <RAFANTINI at salisbury.edu>
Subject: [Milsurplus] LO radiation and the TBX


> Where the radio was deployed in the
> Pacific the Japanese soon learned to DF the transmitter and then land
> mortar fire in that area, a problem for the radio crews. The answer to
> this problem was the development of the TBX eight. That radio was
> equipped with a relay to switch from transmit to receive so the radio
> can be remote controlled over a phone line, have no idea how they did
> the audio but do have accounts of the TBX being used in remote
> configuration. 

Ray, you have some evidence the -8 model of TBX was actually used
in WW2? I have not ever seen a photo in which the radio was an -8,
and that includes up to Okinawa (which is the latest photo i have).

Also- the TBX does not quite lend itself to total remoted operation-
because:  the receiver is still collocated with the transmitter! No way
to remote adjust receiver volume, tuning, etc.

It always occurred to me, maybe mistakenly, that moreso than offering
a remote control advantage, the main feature of the relay switching was
faster T to R changeover - break-in operation.

>Of course
> the TBX was eventually replaced by better radios long before the wars
> end, and by comparison in the Army they had two stages of RF in the
> BC-342, BC-312 and BC-348 receivers, maybe for twice the isolation?
> Ray Fantini KA3EKH
 
I don't see any evidence the TBX was replaced by better radios in the
Navy and Marine Corps.  I'd say the SCR-294/ BC-1306 was a better
radio but i have not seen any evidence the Navy used this. What 
radio replaced the TBX ? 
BTW, one of my GRC-9s had a tag indicating it came off a Navy
destroyer. So i assume this radio rather than the GRC-18 replaced
the TBX - BUT postwar!

The easy way to tell, in photos, which was used, the before-8 or 8
model, is to see whether the meter faces were white or black. The
-8 meters were blackout, augmented by copious  use of radium 
paint. ( sorry for mentioning  that, Dan. )   -Hue Miller