[ARC5] 1155

[Geoff]

----- Original Message ----- 
From: "Mike Morrow" <kk5f at earthlink.net>
To: <arc5 at mailman.qth.net>
Sent: Saturday, July 07, 2012 11:09 PM
Subject: Re: [ARC5] 1155


>I wrote:
>
>> ...the UK helped get the USA away from attraction to its marginally 
>> effective
>> MF/HF command sets to VHF.
>
> Geoff wrote:
>
>> I think not as VHF has severe distance limits that only HF could cover.
>> Both had their purpose and were widely used with excellent results by US
>> forces.
>
> What we've got here is...failure to communicate.
>
> My statement above clearly indicates its application to *COMMAND* sets,
> not liaison sets.
>
> Command sets are used for plane-to-plane communication in formation,
> and for short range communication to air fields on departure and
> approach.
>
> With respect to those "severe distance limits", the operating instructions
> for many US VHF sets contain a graph of line-of-sight-to-ground range
> at VHF frequencies.  The one in the 1944 AN/ARC-1 manual indicates the
> range to be greater than 200 miles for an aircraft at 30000 feet.
> Many of us have used two-meter FM HTs to talk with someone flying
> at 30000 feet several states away.  It's not theory...it's real.
>
> The command set function has always been better served by VHF (or UHF)
> equipment.  No one has ever cited a credible condition where, if
> VHF sets *had* been available, they would not have better served the
> command set function than MF/HF sets.  The UK helped to bring
> the US forces into that realization.  I challenge anyone to find a
> pilot's memoir that bemoans the replacement of the SCR-274-N gear
> with the SCR-522-A.  Pilot praise for the SCR-522-A and the later
> AN/ARC-3, expressed as great preference for the "push button" rather
> than the "coffee grinder" command sets, can be found with little
> difficulty.
>
>> I also understand that the UK outfitted some of their aircraft with
>> better performing US HF gear so they wouldnt get lost on long flights.
>
> That equipment was definitely not a MF/HF command set.  It was AN/ARC-8
> (AN/ART-13A and AN/ARR-11) *LIAISON* equipment.  (AN/ARR-11 is the JAN
> name for the BC-348-*.)
>
> Mike / KK5F
>
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