[ARC5] Wow...

Sun Aug 1 20:45:41 EDT 2021

OK,,,what year(s) was that?
Tim
N6CC

On Sun, Aug 1, 2021 at 5:17 PM Captain D. <mkdorney at aol.com> wrote:

> We had CUCV's in my Pershing Battalion.  All ( Blazer and Pickup versions)
> were straight 24 volt.  Never saw a 12 volt version.
>
> Mark D.
> WW2RDO
>
> In a message dated 8/1/2021 7:59:48 PM Eastern Standard Time,
> timsamm at gmail.com writes:
>
>
> [OT]  OK Robert - I guess we will have to disagree.  Our commissioned unit
> (Mobile Inshore Undersea Warfare Unit 103) utilized Fleet rolling stock
> provided and managed by the USN Civil Engineer Support Equipment program at
> Port Hueneme CA. (Aka the "Seabees").  It was certainly not cobbled
> together by them, or us.
> It and all our vehicles were inspected annually for compliance against the
> "P-404" inspection guide published by them (a major "sweat"
> evolution....which I always passed).  It had one of the EMCU116 12-24 volt
> converters to power the VRC-46. (I had never seen one of those before - I
> was quite interested in it.)
> Maybe that year(s) CUCV Blazer only had a 12V system? Or there was some
> other good reason?  I don't know, I didn't design it.
> But I've learned to "never say never" when dealing with military stuff....
> Tim
> N6CC
>
> On Sun, Aug 1, 2021 at 4:27 PM Robert P. Meadows <rpmeadow at bellsouth.net>
> wrote:
>
> 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>
> 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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