[Milsurplus] EG-3 motor generator set for ??

[Ray Fantini]

Thought that the TBX was intended to be used in the field with the companion battery case that's the same size as the radio for receive operations and a crank generator that was intended to be strapped to a tree? That way you would tell the lowest man in the squad to start cranking the generator prior to transmitting and have him stop when it's time to receive.
Somewhere recall reading something about that radio being accompanied by a squad of men to operate. A gas powered generator would be a waste being its only required during transmitting and if you have a dozen or so men involved in the transport and set up of the radio you would always have two or three hands around to crank the transmitter.
Imagine  though in something like a fire control situation and in use throughout several hours cranking the generator would get old, but legend has it that the TBX was used primarily by the USMC and if there is any branch of the service that would be up to the challenge of cranking a radio all day long it would be them.

Ray F

From: WA5CAB at cs.com [mailto:WA5CAB at cs.com]
Sent: Friday, July 10, 2015 2:30 PM
To: Ray Fantini; milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] EG-3 motor generator set for ??

That's true.  But all the more reason for combining the low-power receiver supply with the usually larger transmitter supply.  But in general, for most receiver supplies, there is also a separate transmitter supply designed to operate off of the same source (voltage and frequency).  The only exceptions seem to be 6 VDC, 24 VDC and gasoline.  That I've managed to ID, anyway.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 07/10/2015 12:01:19 PM Central Daylight Time, RAFANTINI at salisbury.edu<mailto:RAFANTINI at salisbury.edu> writes:

Early or pre TBX-8 radios that used the 34 tubes required very little battery power so the receiver had a separate power that only had to provide under 10 mA on the B+ and less than 400 mA  for the filament. The radio I had was capable of running for hours on the battery pack that I put together for its receiver. The transmitter required 12 volts at around an amp and the 500 volt source for the plate and screen of its signal tube so you only needed those two voltages when transmitting.
Would assume that provided a radio that with the hand crank generator required a minimal amount of equipment when used in the field.
Ray F

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of WA5CAB--- via Milsurplus
Sent: Friday, July 10, 2015 12:33 PM
To: milsurplus at mailman.qth.net<mailto:milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] EG-3 motor generator set for ??

The EG and EH were for the TBX transmitter. For unknown reasons, with one late exception all of the power supplies for the TBO and TBX Series were for only the receiver or only the transmitter. The exception was the CRF-20337 12VDC Vibrator Power Supply, for the TBX-7 and TBX-8.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480


In a message dated 07/10/2015 10:11:59 AM Central Daylight Time, navy.radio at gmail.com<mailto:navy.radio at gmail.com> writes:
>Hi gang - What equipment was this used for?
>http://www.ebay.com/itm/131553638246
>1939 contract date for EG-1 with same specs (EH-1 was the 115vdc motor
>version)
>500v @0.065A won't power too much...
>
>cheers,
>Nick