This uber-complexity seems to occur in many early radio equipments,
often the ones purchased by the government. I've seen NDB's with two
non-shifted xtal oscillators, one keyed on/off to achieve the same
result. They're the pits if the unkeyed one is the one giving you QRM
problems on 160. I've also seen a single oscillator, with the PA
cathode or grid blocked keyed. Maybe it's "more complex, more revenue."
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
PS: "Equipments" is a valid word in the US Department of Defense dictionary.
On 9/26/2017 3:38 PM, Edward R Cole wrote:
When I modified my aircraft beacon (NDB) transmitter I found two xtal
oscillators running at about 265-KHz separated by 400-Hz they were
keyed by a MCW keyer which shifted the frequency for dots and dashes
and back to original frequency for non-keyed signal thus creating
400-Hz MCW. Aircraft radios are primarily AM so could receive MCW.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
