[R-390] Product detectors for dummies

[jtbrannig]

I have a CV-591 attached to my R-390A, It works fine..JimWB2TPS
-------- Original message --------From: Barry Scott <72volkswagon at gmail.com> Date: 9/29/24  2:01 PM  (GMT-05:00) To: "Ing. Giovanni Becattini" <giovanni.becattini at icloud.com> Cc: R-390 at mailman.qth.net Subject: Re: [R-390] Product detectors for dummies I used to have an external product detector that used the IF output as itsinput.  It worked quite well and I wish I hadn't sold it!  Perhaps youcould find something like this?Thanks,Barry - N4BUQOn Sun, Sep 29, 2024 at 12:57 PM Ing. Giovanni Becattini via R-390 <r-390 at mailman.qth.net> wrote:> 1) why do we say that our R-390A has not a product detector? If I> correctly understood, when we use the BFO, we practically use a product> detector. I would prefer to say that we can implement a better product> detector. Is this correct?> 2) The use of BFO as is, produces a local carrier which is too low in> relation to the IF out which contains the side band. For this, we need to> attenuate the RF gain to get a good audio signal. Is this correct?> 3) my 51J-4 seems to work much better than the R-390A receiving SSB> signals. This is partly confirmed by the fact that Collins officially sold> 51J-4 ALSO for SSB. Looking at the schematic, I could not find an> explanation for that; the signal from the BFO is simply connected to the> envelope rectifier diode. Was it simply designed “better”?>> Forgive this donkey… 😁> ______________________________________________________________> R-390 mailing list> Home: http://mailman.qth.net/mailman/listinfo/r-390> Help: http://mailman.qth.net/mmfaq.htm> Post: mailto:R-390 at mailman.qth.net>> This list hosted by: http://www.qsl.net> Please help support this email list: http://www.qsl.net/donate.html______________________________________________________________R-390 mailing listHome: http://mailman.qth.net/mailman/listinfo/r-390Help: http://mailman.qth.net/mmfaq.htmPost: mailto:R-390 at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html