[ARC5] Wow...

Sun Aug 1 18:39:33 EDT 2021

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>
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 <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>
> *Cc:* ARC-5 List <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>
> 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 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 <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>; Ken
> > <kgordon2006 at frontier.com>; MARK DORNEY <mkdorney at aol.com>;
> kk5f at arrl.net;
> > ARC-5 List <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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