[ARC5] What rough beast?

[Scott Johnson]

There were two transmitters- the T-278 (25 W?) and T-416 (60W) , I believe.  The set is based upon the Motorola portables of the day, which were actually considered very reliable.  I have several of the sets, both mobile and fixed station, with or without an additional high power amplifier, plus the PRC-21 portables that play with the system.  There is also a low band version.  I think the army decided it was more cost effective to just use plain old civilian land mobile gear for non-tactical use after they spent all the money on this system.  Don’t really know what they gained over Motorola’s civilian offering at the time, but it is cool looking!

 

Scott V. Johnson W7SVJ

5111 E. Sharon Dr.

Scottsdale, AZ 85254-3636

H (602) 953-5779

C (480) 550-2358

 <mailto:scottjohnson1 at cox.net> scottjohnson1 at cox.net

 <mailto:scott.johnson at ieee.org> scott.johnson at ieee.org

 

From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mike Everette via ARC5
Sent: Wednesday, June 8, 2016 7:50 PM
To: Mike Morrow <kk5f at arrl.net>; ARC5 at mailman.qth.net
Subject: Re: [ARC5] What rough beast?

 

The transmitter is full of "peanut" tubes with wire leads.  If I remember right, the final is a 2E24, maybe an instant-heat version of the 2E26.

 

The set is constructed using various plug-in modules, most containing one or maybe two such tubes. Not easy to service.

 

I know of some of this gear being put into ham repeater service many years ago, but it was not known for reliability.

 

73

 

Mike

 

WA4DLF

 

  _____  

From: Mike Morrow <kk5f at earthlink.net <mailto:kk5f at earthlink.net> >
To: ARC5 at mailman.qth.net <mailto:ARC5 at mailman.qth.net>  
Sent: Wednesday, June 8, 2016 12:48 PM
Subject: Re: [ARC5] What rough beast?


Nameless/call-less wrote:

> Has anyone any information/ thoughts on the T-278/U transmitter?  One just
> popped up on that auction site.  Apparently part of AN/VRC-9.  A dynamotor
> is offered in a separate auction.

Well, it's not aircraft related.  And it's not part of the AN/VRC-9, which is a low VHF band tactical FM set.  It's part of the AN/VRC-19 two-channel high-band non-tactical (military police) VHF FM set of 1952.

http://radionerds.com/index.php/File:AN_VRC-19_a_8752445257_l.jpg

http://www.radiomuseum.org/r/motorola_transmitte_radio_t_278u.html

T-278/U, R-394/U, and DY-98/U (12v) or DY-98/U (24v) or DY-100 (6v) all fit in one cabinet/case CS-938/U.

It's heavy and not much use and inspires not much interest, but it is well-made.  I still have one of the fifty or so T-278/U units that my Civil Air Patrol unit got in 1969.  I don't think any were ever used before they were junked.

Mike / KK5F


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