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ATS 1
BFO Tuning Tips from YI
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TOPIC: BFO Tuning Tips from YI
#178
vu2gti
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Gender: Male Ham Radio India Resource Website Location: Bangalore Birthday: 12/07
BFO Tuning Tips from YI 3 Years ago Karma: 5
YI - OM Sanat freezing in Dakota has pointers for tuning BFO using audio oscillators on computers.

YI - Share your tips with the world!!!
 
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VU2GTI
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#179
vu2yi
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Re:BFO Tuning Tips from YI 3 Years ago Karma: 0
Hey Hammers! Greetings, I am very glad to see such an active group on the art and science of ATS-1 home brewing!. I built myself one long time back and have many fond memories of both building and operating the ATS-1. One thing i struggled with was fine tuning the BFO. I am not a musician though can tell when a station is off center , but then as a novice i had simply no clue.. So here is what i came up with and surprisingly i don't see this technique used elsewhere (may be didnt research enough). The requirement: The BFO needs to be exactly 1.5 Khz lower/higher (USB/LSB) than the central frequency of the xtal filter. Generate an exact 1.500 Khz tone using a free ware such as (www.world-voices.com/software/nchtone.html) and feed it through speaker mic -- the complete audio section. Adjust the level for a measurable or IF after the xtal filter using a simple rf probe. Tune the trimmer on the BFO to maximize output after the xtal filter. This will ensure that the BFO is exactly 1.5Khz higher or lower than the central frequency of the xtal filter. Comments criticisms and suggestions welcome
cheers and best 73's
 
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