[ARC5] Jeeps with Radio Equipment

[Mike Morrow]

My earthlink webmail service for some reason eliminated all line feed in my posting, and the arc5 server sent me NO copy for me to see that anything was even posted.

My apologies to all.  Earthlink bites!

Mike / KK5F

-----Original Message-----
From: Kenneth G. Gordon <kgordon2006 at frontier.com>
Sent: Jul 31, 2021 11:58 AM
To: Mike Morrow <kk5f at earthlink.net>
Subject: Re: [ARC5] Jeeps with Radio Equipment

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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