[MRCG] WW2 vhf ground mobile (More) BC-721

Sat Sep 13 20:26:53 EDT 2014

The BC-611 in the glider was somewhat different and was the BC-721.
Same output though.
Pat

-----Original Message-----
From: MRCG [mailto:mrcg-bounces at mailman.qth.net] On Behalf Of Robert
Burmeister
Sent: Saturday, September 13, 2014 7:19 PM
To: West Coast Military Radio Collectors Group
Subject: Re: [MRCG] WW2 vhf ground mobile (More)

Thanks for your report! The short and inefficient antenna on the BC 611 is
clearly its major limitation, especially for air - ground work.

Yes the link was glider to tow plane, but the radio could be removed if
necessary for ground use.

Bob

On Sat, Sep 13, 2014 at 3:36 PM, Tim <timsamm at gmail.com> wrote:

> Hi Bob - Well, I was one of the guys trying to work AF6IM while he was 
> parachute mobile with his BC-611.  He was approx 19 miles from me 
> (home QTH), optical line-of sight, and I worked him easily with a 1 
> watt HT on 2 meters FM.  Several times on a couple of jumps during the 
> Pacificon events..
>
> During the BC-611 jump I was running a GRC-9 to a reel antenna wire in 
> the back yard but I did not work him - and I tried pretty hard - I 
> could not hear his signal, even while the BFO was on listening for his 
> carrier - no joy, and I had a low local noise level during the 
> experiment.. I don't know if he heard me though, he reported QRM 
> during the test.  I could hear a station in Palo Alto (?) trying to call
him ...
> So that didn't work for me, although 19 miles, clear optical LOS is 
> still a stretch with a few hundred milliwatts from a very inefficient 
> antenna (and no "ground" nearby, LOL)  .  A great experiment 
> nonetheless.... Many miles LOS over seawater should be very easy and has
been reported on by others.
> Ground-to-air over very short distances (like to Tac aircraft) should 
> technically work but I think at a practical combat level, I'm doubtful 
> it would be useful....
>
> Glider radios : weren't they employed because the twisted pair phone 
> line wound around the glider tow rope chafed through and failed on 
> takeoff?  So that link was glider- to- tow plane if I remember 
> correctly?...You guys know...
>
> Sorry to hijack John's VHF jeep radio thread!
>
> Tim
> N6CC
>
> On Sat, Sep 13, 2014 at 12:20 PM, Robert Burmeister < 
> raburmeister at gmail.com>
> wrote:
>
> > Probably not. The technical manual (TM-235) does show a figure on P. 
> > 17 showing one in use with planes (bombers) flying overhead, but 
> > this is not really close air support.
> >
> > FYI, we did an air-ground QSO with a BC-611 from a parachutist at
> Pacificon
> > - see:
> >
> > https://www.ermag.com/index.cfm?v_link=product_detail&v_key=639
> >
> > A variant of the BC-611 was the main radio of the gliders in use in 
> > WW
> II.
> >
> > Bob
> > AG6QL
> >
> > On Sat, Sep 13, 2014 at 12:03 PM, Tim <timsamm at gmail.com> wrote:
> >
> > > While we are at it, would a BC-611 been at all effective in Ground-Air
> > > comms?  Particularly with close air support aircraft?   Methinks "not
> so
> > > much".....
> > >
> > > Tim
> > > N6CC
> > >
> > > On Sat, Sep 13, 2014 at 12:38 AM, Dennis DuVall <
> duvallddennis at gmail.com
> > >
> > > wrote:
> > >
> > > > John, et-al,
> > > >
> > > > The "official" system was the VRC-1 and included a jeep mounted 
> > > > (HF)
> > > > SCR-193 (BC-191 xmtr, BC-312 rec.) and a 12 volt version of the 
> > > > (VHF) SCR-522.  Didn't come into use until Normandy and beyond.  
> > > > Hard to
> > > believe
> > > > but up to that time there was no way for the grunts on the 
> > > > ground to communicate directly with the tactical support 
> > > > aircraft flying above
> > > them!
> > > >
> > > > Information from the "Green" Books.
> > > >
> > > > Dennis
> > > >
> > > > ***************
> > > >
> > > > On Sep 12, 2014, at 6:56 PM, mac via MRCG <mrcg at mailman.qth.net>
> > wrote:
> > > >
> > > > > The first use was with kluged up configurations utilizing 
> > > > > SCR-522s
> > > > "midnight requisitioned" from the Air Force.  The Signal Corps 
> > > > jumped
> > in
> > > > belatedly with an "official " version of the setup.  Don't 
> > > > remember
> the
> > > > nomenclature off the top of my head but sure someone will jump 
> > > > in
> here
> > > with
> > > > that.....
> > > > >
> > > > > Dennis D. W7QHO
> > > > > Glendale, CA
> > > > >
> > > > > ************
> > > > >
> > > > >
> > > > > On Sep 12, 2014, at 5:34 PM, <boatanchor at martasystems.com> wrote:
> > > > >
> > > > >> Just starting to research what TX/RX equipment would have 
> > > > >> been
> > correct
> > > > in a WW2 Jeep for VHF aircraft communications. Anyone know or 
> > > > have
> > ideas
> > > ?
> > > > >>
> > > > >> Thanks
> > > > >> John WB6AZP
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