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Old 11th Oct 2010, 12:09 am   #12
Alistair D
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Join Date: Jan 2010
Location: Edinburgh, UK.
Posts: 2,008
Default Re: Product detector circuit

Quote:
Originally Posted by glowinganode View Post
I'm currently toying with a product detector for an RA17L and would also be interested in any designs going (especially the coils). I was planning to use the BFO on-off switch to switch between ssb and am. As I understand the BFO control would operate at the same settings as before (ie +/- 1.5 - 2.0 KHz for LSB / USB depending on filter setting).
Rob.
The circuit(s) in the RSGB handbook rely purely in the IF passband for any filtering. The width of the passband does not alter the perfomance of the product detector. It does reduce the possibility of adjacent channel reception.

On my Yaesu FRG 7000(also a Wadley Loop receiver) the AM, USB, LSB switch does 2 things. Between AM and USB/LSB it switches crystal filters from 8khz down to 2.2khz then the USB, LSB positions switch different crystals into the BFO.

Al
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