[ARC5] Jeeps with Radio Equipment

Sat Jul 31 14:23:18 EDT 2021

If you look at the Iran photo VERY carefully you can see the jumper cables
running from the C-87 Put Put APU over to the jeep battery bank...

(Sorry, couldn't help myself!)

Tim
N6CC

On Sat, Jul 31, 2021 at 11:18 AM Captain D. via ARC5 <arc5 at mailman.qth.net>
wrote:

> Radio modification of the transmitters for the ARC-5/ SCR-274 is extremely
> difficult, but not impossible.  So modification would really depend on the
> motivation of the tech doing the mod, and his ability to find the parts
> needed.  If the regular USAAF/USN  radios were not available, then use of
> an SCR-274/ARC-5 is brought into play.  The photos of the modified vehicles
> do not positively show a power source, and a 24 volt kit to convert the
> vehicle electrical system was not available for the MB/GPW ( or the
> WC-series 3/4 ton vehicles, for that matter) until well after WW2 ended,
> and there were no 24 volt electrical system 1/4 or 3/4 ton wheeled vehicles
> factory produced for field use until the 1950s..  I agree that in such a
> situation, converting the radios to 12 volt is not likely, since parts to
> do so would not be readily at hand.  So we're left with getting a scrounged
> generator/APU to supply the 24 volts needed to power the radio/ recharge a
> bank of batteries to provide the necessary 24 volt power to the radio in
> the picture.  There is no APU/generator anywhere in the pictures that have
> been posted to far. The only assumption that can come from that is the
> equipment used to power the radios/recharge the battery bank was supplied
> by something not in the pictures.  A trailer mounted generator/APU makes
> sense, especially and APU.  The APU was already in USAAF inventory, and was
> commonly used for bomber aircraft.  The APU could be connected to the
> radios using a theatre made cable with plugs and sockets gotten through
> regular supply channels, or scrounged from damaged/not airworthy aircraft.
>
> Mark D.
> WW2RDO
>
>
> "Courage is not having the strength to go on.  Courage is going on when
> you don't have the strength."   -  Theodore Roosevelt
>
>
> Sent from my AOL Desktop
> <https://discover.aol.com/products-and-services/aol-desktop-for-windows>
>
>
> .
> In a message dated 7/31/2021 12:59:22 PM Eastern Standard Time,
> kgordon2006 at frontier.com writes:
>
>
> On 31 Jul 2021 at 16:43, Mike Morrow wrote:
>
> > The radios may not be ARC-5, SRC-274 or ARA radios. They may be an
> > earlier> look-a-like that ran on 12 volts.Rule that out positively.
> > There were no such radios anywhere anytime in military service...ever
> > (except the R-148/ARC-5X and its rack... a 14 vdc version of
> > R-23A/ARC-5).  When use of an aircraft MF/HF command set was required in
> > a 12 vdc environment, the USAAF used the SCR-A*-183 and the USN used the
> > appropriate RU/GF system.> Either that, or parts were scrounged and
> > radios were heavily modified.This suggestion lacks credibility.The full
> > SCR-274-N installation shown in Bill's photo looks like one pulled
> > "lock, stock, and barrel" from a USAAF aircraft with no attempt to
> > tailor it to just whatever HF capability that jeep may have required.
> > (Certainly it did not need a beacon band receiver.)  Just how great
> > would be the motivation to locate ten rather uniquely configured 12 vdc
> > relays of six different types, install them in five different
> > components, rewire filaments in six different components, and rewire
> > carbon mic excitation just to be able to install a stock-looking
> > complete SCR-274-N in a 12 vdc jeep?  Occam's Razor indicates that the
> > ONLY reasonable and logical conclusion is:  That SCR-274-N is being
> > supplied 24 vdc.Mike's photo of a custom single receiver single
> > transmitter installation provokes these comments:1.  The transmitter
> > control box appears to have a built-in key on its top.  Only the ATA
> > CBY-/CCT-23243 and SCR-274-N BC-451-A control boxes have a key...the
> > very rare C-29/ARC-5 does not.  That indicates the equipment is ARA/ATA
> > or SCR-274-N.2.  ALL components have black paint.  That indicates the
> > equipment is ARA/ATA or EARLY SCR-274-N.It is equally unlikely that this
> > equipment has been reworked for 12 vdc for the same reasons I cited
> > above except that only six 12 vdc relays of six different kinds would be
> > required.  Anyone performing such a quixotic feat should also have
> > realized that a single-transmitter system using only VOICE emission
> > requires NO transmitter control box.  Some post-WWII USN training
> > aircraft used only the T-19, R-23A, and R-26/ARC-5.  There were C-125
> > controls present for the R-23A and R-26, but the ONLY transmitter
> > control was the instructor's PTT switch.My conclusion:  The sets in each
> > of these photos without any doubt are being supplied 24 vdc.
>
> I absolutely agree with this statement!!!
>
> >  I will not
> > speculate from where the 24 vdc comes.Mike / KK5F
>
> Ha ha! **I** will! :-)
>
> Ken W7EKB
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