[Milsurplus] BC-1206-B IF bandwidth

[AKLDGUY .]

Thank you for that comprehensive background, Mike.
An example of the BC-1206-B in pretty good nick is
available and I was wondering what use it could be put to.

73 de Neil ZL1ANM


On 3/9/16, Mike Morrow <kk5f at earthlink.net> wrote:
> Neil wrote:
>
>> The receiver covers 200-400 KHz ... I think it was intended as a NDB
>> beacon
>> receiver only...
>
> Just the opposite, actually.  It was intended for DIRECTIONAL beacons of the
> Adcock A-N type from which four traffic lanes/beams originated, not
> necessarily 90 degrees apart.  A lane/beam could be flown by flying a path
> that merged A and N reception around the path to a solid continuous
> tone...no loops or indicators required...just the pilot's ears.  In
> addition, control tower AM transmissions could be copied...278 kHz was most
> common, paired with aircraft AM transmission on 3105 kHz (typical).  This
> whole system was in place by the mid-1930s.
>
> Directional beacons were essentially extinct in North America by the end of
> the 1950s.  Most became simple non-directional beacons that require aircraft
> RDF or ADF sets with loop in order to be useful as a nav aid.  A simple
> receiver like the BC-1206-* has no navigation value unless the received
> beacon is directional.
>
> For example, a typical WWII-era light-aircraft 12-vdc installation in a
> Stinson L-5 used:
>
> RCA/CR&TC AVR-20-A1 2300 to 6700 kHz receiver (plane to plane),
> RCA AVT-112 2500 to 6500 kHz transmitter (plane to control tower),
> Setchell-Carlson Model 512 (R-76/ARR-13) 200 to 420 kHz with 278 kHz
> pre-set
>   receiver (control tower to plane, directional beacon),
> RCA AVA-126 12-vdc vibrator power supply.
>
> That R-76 beacon band radio served vital communications and navigational
> purpose.
>
> Mike / KK5F
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