Approaching off topic, but possibly of interest as Loran and WWVL is on the
fringes of this...
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I have several dead King KR-85 ADF untis that I want to repair and press into
service as 505khz beacon monitors. Designed primarily for receiving 200khz to
500khz non directional beacons, they came out of 1970's vintage private planes
and to date I have not been able to come up with a service manual with
schematics (short of paying $70 for a manual at Esso Air). Is there any chance
that anybody out there may be able to assist with at least a partial copy of a
manual
These things are interesting - run on 12 volts, typicaly have an IF strip in
the 150kc range and have a "digitally generated" vfo that has a TTL divider
chain and a PLL for generating a sine wave. BFO included! And the front
end on these things have pretty good input filters divided into three bands -
200khz-400khz, 400khz-800khz and 800khz-1600khz (Yup - covers the AM radio
band) to reduce intermod fro out of band stuff. Conversion to 137 or 185khz
would be awkward, but theoreticaly should be possible, likewise conversion to
ham 160m, or down to 60khz or 100khz for other fun stuff. They have a balanced
loop input as well as an unbalanced sense antenna - lots of potential!
73 - Tom in St. Louis
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