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Title: 183d product detector Post by: KB5MD on February 02, 2021, 10:07:36 AM I am wanting to install a product detector into a NC-183D. Does anyone have the schematic they could email or post which came out in ER #44? I have a collection of several years ER but that
issue is missing. I believe it used a 6SN7 and was installed in the FM adapter socket. FOUND IT, THANKS Title: Re: 183d product detector Post by: k2cu on February 05, 2021, 02:00:20 PM you might also consider replacing the CW oscillator with a pentagrid converter tube with appropriate base. Bill Orr had created one for the 51J-4 receiver that use a 6BE6 and worked very well.
Title: Re: 183d product detector Post by: w3jn on February 06, 2021, 06:45:22 AM The 6SN7 mod works very well and half the work is done for you already at that NFM socket. I'm not a big fan of pentagrid product detectors, I've never seen one that produced really clean audio on strong signals. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I had to mess with the coupling cap from the IF to reduce the signal level at the grid of the 6SN7. As I recall I reduced it to 50 pF or so, but experiment a bit for minimum distortion on strong signals. |