[MRCG] WW2 vhf ground mobile (More)

Sat Sep 13 19:19:05 EDT 2014

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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