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 Post subject: TBW-5 radio equipment
PostPosted: Jan Fri 29, 2016 5:59 am 
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I had a few questions about some equipment i have. I have not had much luck getting my questions answered by doing my own research. My original objective was to have a radio set up and operators books to use if needed. I am not sure if these would be good for that purpose. Any help with possible missing parts and insight into the capabilities of these units would be much appreciated.


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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Fri 29, 2016 6:43 am 
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I have approved your post, bur we need much information regarding the equipment you are asking about. Is this pertinent to the Vintage Communications forum? Photos and more info would be helpful.

Pete

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Fri 29, 2016 7:26 am 
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The TBW is a WW2-vintage transmitter built by Westinghouse.

The HF section was popular with ham radio ops for a 100W CW/25W AM phone transmitter.

Rugged, lightweight (for WW2 boatanchor gear), simple to operate.

DG

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Fri 29, 2016 7:40 am 
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I will have to upload photos over the weekend. I am restricted for 24 hrs.


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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Fri 29, 2016 9:51 pm 
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Location: Santa Rosa, CA
Up until about a year ago I had the complete TBW set (two transmitters
and the modulator/supply). If you are planning to actually use these the major hurdle will be replacing the 400 Hz power transformers or finding
a substatial 115vac, 400 Hz power supply. These are VERY basic,
but well built transmitters but I would personally never use them
on the ham bands. For one thing the output power is low (esp AM) and the design and shielding gurantees problems with RFI.

The matching receivers were the two RBM units (one MF and one HF).
The set (TBW and TBM's) were used primarily by the Marines and
Navy during invasions in the Pacific (but perhaps Europe too) and were
often the first substantial radios on the beach. They were designed
to be modular so they could be split up and carried AND would
fit through the hatch of a submarine. Power was originally supplied
by a small gas genset. These were also used on subs as emergency
back ups.

Very few seem to have survived. The set I had was the only one I've
seen in 50+ years of collecting WWII military equipment.
Steve W6SSP

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Fri 29, 2016 10:54 pm 
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I have the HF section, with a good power supply/modulator unit I bought from a ham estate about 10 years ago. Still works FB.

Makes less spectrum trash than my friends' Apache.

73DG

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Sat 30, 2016 1:38 am 
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I seem to recall the TBW I had required 800 Hz from a gas generator, not 400 Hz.

I sold all mine years ago, I had maybe 4 complete sets less cables and power supplies (generators.) Unless you are a serious collector of military gear or want to take the time and effort to build an AC power supply to have a CW-AM only transmitter of 1930's design, these are probably a really poor choice for someone getting started.

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Sat 30, 2016 3:47 pm 
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Geoff Fors wrote:
I seem to recall the TBW I had required 800 Hz from a gas generator, not 400 Hz.

I sold all mine years ago, I had maybe 4 complete sets less cables and power supplies (generators.) Unless you are a serious collector of military gear or want to take the time and effort to build an AC power supply to have a CW-AM only transmitter of 1930's design, these are probably a really poor choice for someone getting started.



E-gad! You are correct, the transformers are 800 Hz. Did not realize there
were this many TBW's around.
Steve

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Sat 30, 2016 10:50 pm 
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All one needs is a Watt or two, audio-wise to modulate it, as it was designed for supressor modulation so no big iron needed.

73DG

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Sun 31, 2016 2:54 am 
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Image

Image

Image

Image


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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Sun 31, 2016 3:18 am 
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Scotty, nice set. Try and preserve them, fewer & fewer each year.

They can be made to sing again without any internal mods, just some simple construction.

73DG

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Sun 31, 2016 3:44 am 
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Thanks for the info. I was finally able to post some photos. Are there any other parts missing besides the power supply. It would be neat to see these operational.


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 Post subject: Re: TBW-5 radio equipment
PostPosted: Jan Sun 31, 2016 4:03 am 
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Well, you appear to have everything needed but the 800Hz genset.

The easiest thing to do is build a simple mains supply to match the power requirements on the data plates.

73DG

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 Post subject: Re: TBW-5 radio equipment
PostPosted: Feb Mon 01, 2016 4:06 am 
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Location: Manassas, Virginia
The 800Hz requirement was an attempt to reduce weight (transformers, etc) since the original GO-* it was based on was (true story) designed for aircraft use. I'd love to find a nice GO-9 with its cabinet and all mounts because it's such a neat looking transmitter. Always wondered if you could easily swap in the modulator/supply deck from a TBW to make it work voice as well. The only drawback to the TBW for me has always been the 3 pc transit case set up which doubles as cabinetry. The GO- series has one, clean, black wrinkle cabinet.

I've actually seen a number of complete(three main sections) TBWs for sale over the last couple years. One was about 45 minutes from me over in Chapel Hill, but I passed on it. Pretty sure I exchanged email with you Steve as well when your units were for sale.

Mike Hanz/KC4TOS who is a member of this group has an excellent site that includes information on the GO-9 version. His site can be found at:

http://aafradio.org/

I always warn people to make sure you have a little time on your hands before visiting the site. IMO it's the best site online for WWII Navy aircraft gear as well as some very scarce documentation and other interesting info. Mike helped out on the restoration of the B-29 Enola Gay at the Smithsonian Air & Space museum if that's any hint.


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