[ARC5] ARC-5/SCR-274 Navagation Receivers?

[dean at laptop4hire.com]

 Aircraft navigation over land was done entirely aurally, using the Low 
 Frequency Radio Range, a.k.a. Four Course Range, A.N. Range or Adcock 
 Radio Range.  This radio system broadcasts four course beams modulated 
 by the Morse code letters A and N.  See:  
 http://en.wikipedia.org/wiki/Radio_navigation#Low_frequency_radio_range  
 or google "four course range".  There was no indicator required in the 
 cockpit.  You only needed a receiver that tuned 200 - 400 KHz.  It had 
 many drawbacks but was extremely simple and required minimum equipment.

 Direction finding is an entirely different capability.  By adding the 
 loop and sense antennas and an indicator the pilot can home in on any 
 radio signal and there were also simple Non Directional Beacons in the 
 aviation navigation systems of that time, which actually still exist 
 today, and there were also Fan Markers that located specific positions 
 usually along range legs.  Of course the DF system could also home in on 
 broadcast station if the receiver could tune that band.

 Dean / WA6IKJ

 On Fri, 29 Apr 2011 09:35:06 -0700, "Leslie Smith" 
 <vk2bcu at operamail.com> wrote:
> Hello List,
> I'd like to add to Bob's question by noting that (at least) later 
> ARC-5
> sets have a two-terminal attachment for the navigational loop, 
> including
> a switching mechanism whereas the earlier ARA and BC-453 sets don't.
> What were the circumstances that led to the change, and when was it
> made.
>
>
>   Leslie Smith
>   vk2bcu at operamail.com
>   (end)
>
>
>
> On Thu, 28 Apr 2011 23:04 -0700, "Bob Macklin"
> <macklinbob at earthlink.net> wrote:
>> Can someone explain to me how the ARC-5/SCR-274 navigation receivers 
>> were
>> used.
>>
>> There must have been a loop antenna and ADF display that were not an
>> actual part of the ARC-5/SCR-274 components.
>>
>> I'd also like to find documentation on the ARN-6 and ARN-7 radios.
>>
>> Bob Macklin
>> K5MYJ
>> Seattle, Wa.
>> "Real Radios Glow In The Dark"
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