[ARC5] Wow...

Sun Aug 1 19:27:55 EDT 2021

Well, Tim, you might have not been driving a real CUCV, but some USN procurement that was cobbled together.

Or the ground electronics ETs who installed the radio were stone dead stupid.  Very likely…

R

From: Tim <timsamm at gmail.com> 
Sent: Sunday, August 1, 2021 6:40 PM
To: Robert P. Meadows <rpmeadow at bellsouth.net>
Cc: MARK DORNEY <mkdorney at aol.com>; ARC-5 List <arc5 at mailman.qth.net>
Subject: Re: [ARC5] Wow...

Hi Robert - Interesting.  It's been 30+ years since I was driving one in the Navy.  I forget what year model it was but it definitely had the 12-24 volt converter for the VRC-46. (I thought the 24 V system was only for the starter which included 2 alternators for charging 2 batteries, the rest of the vehicle was 12 volts?

I didn't design them - and  I'm not a Car Guy  haha).  

Maybe some recent missed List messages but as I subsequently noted the converter is an EMCU116, see Brookes website for the details.  18 Amps:   http://www.prc68.com/I/EMCU116.shtml

Voltage conversion is easy:  12 volt transistor power oscillator driving a 1:2 step-up transformer, driving a rectifier / filter.

Sounds like some (later?) version Blazers simplified the 24 V requirement.  Seemes running the radio off the 24 volt battery stack would be simpler but there must have been a reason why it was not done in our trucks.

Tim

N6CC

On Sun, Aug 1, 2021 at 3:20 PM Robert P. Meadows <rpmeadow at bellsouth.net <mailto:rpmeadow at bellsouth.net> > wrote:

Now, that is a stretch, The CUCV is a 12/24 volt electrical system, specifically to run radios and to provide 24 volts for starting other vehicles.  The radio installation on the M1009 (Blazer) provided 24V (27.5v) power to a substantial terminal strip installed behind the passenger seat about 12 inches from the door post for power to the installed radio set that utilized a mount that attached at essentially the same location.  There were no 12/24 volt converters,

And further would someone tell me how you convert voltage?  

My point of reference is that I owned for several years a M1009, and at present have a M1008 and M1028, with all the manuals, references, etc.

R 

From: arc5-bounces at mailman.qth.net <mailto:arc5-bounces at mailman.qth.net>  <arc5-bounces at mailman.qth.net <mailto:arc5-bounces at mailman.qth.net> > On Behalf Of Tim
Sent: Sunday, August 1, 2021 5:30 PM
To: MARK DORNEY <mkdorney at aol.com <mailto:mkdorney at aol.com> >
Cc: ARC-5 List <arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> >
Subject: Re: [ARC5] Wow...

Scott is right.  There was a milspec 12 to 28 volt converter available for CUCV vehicles.  My Reserve unit had them in our Chevy Blazer CUCV's to power the VRC-46 (RT-524) sets.  1980's thru 1990's, did the job in Saudi Arabia and elsewhere...  I forget the nomenclature but I think it was an EMU-???  Transistorized of course, about 8x5x4 inches thereabouts...  I'd like to find one if anyone has a spare kicking around!

Tim

N6CC

On Sun, Aug 1, 2021 at 2:12 PM MARK DORNEY via ARC5 <arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> > wrote:

Just because Fair radio had a converter of some sort doesn’t mean it was available to the US military during WW2, or at any time, for that matter. 

Mark D. 
WW2RDO

“In matters of style, float with the current. In matters of Principle, stand like a rock. “.   -   Thomas Jefferson 

Sent from my iPhone

> On Aug 1, 2021, at 3:42 PM, scottjohnson1 at cox.net <mailto:scottjohnson1 at cox.net>  wrote:
> 
> There were many of those converters made for the military, mostly to allow
> 28V radios to be used in commercial vehicles (flightline pickups and vans,
> etc.)  Magnavox even made a little box that would accommodate a UHF or VHF
> radios such as the ARC-164 or ARC-186.  It accepted 12/24 VDC, or 115/230V
> AC, and had a built-in amplified speaker and mic jacks.  It even had a plate
> to mount an AT-256 antenna on top for portable use.  I have three of them,
> one with an ARC-164, one with an ARC-186, and one with an ARC-210.  We
> carried around a Wilcox 807 in the flight line van with an inverter, an
> upgraded to the little Magnavox box when they became available (the SOF
> truck had both VHF and UHF if memory serves).  I think I can remember line
> vans with ARC-27s in them, with an auxiliary alternator and 24V battery just
> for the radio.  Most vans just had UHF, but a few also had ARC-73s or
> ARC-49s for VHF.
> 
> Scott 
> 
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net <mailto:arc5-bounces at mailman.qth.net>  <arc5-bounces at mailman.qth.net <mailto:arc5-bounces at mailman.qth.net> > On Behalf
> Of Hubert Miller
> Sent: Sunday, August 1, 2021 12:24 PM
> To: MICHAEL ST ANGELO <mstangelo at comcast.net <mailto:mstangelo at comcast.net> >; Ken
> <kgordon2006 at frontier.com <mailto:kgordon2006 at frontier.com> >; MARK DORNEY <mkdorney at aol.com <mailto:mkdorney at aol.com> >; kk5f at arrl.net <mailto:kk5f at arrl.net> ;
> ARC-5 List <arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> >
> Subject: Re: [ARC5] Wow...
> 
> Fair Radio for some years sold a cubical box with something like 8 inches on
> a side, that converted 12 DC to 24 DC. What was that thing for?
> -Hue Miller
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