[MRCG] WW2 vhf ground mobile (More)

Sat Sep 13 19:26:42 EDT 2014

I would say that although interesting the parachute test of the BC-611 is not really on point in terms of its use as a ground to air radio. In practice the 611 would have been in contact with a much higher power set with a much more efficient antenna in the aircraft. I would expect that the 611 would work quite well in that application. 

Andy
KS6TKX

Sent from my 1944 Westinghouse TBK

> On 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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