[R-390] ssb stand alone product detector

[Larry H]

Jose, Those 2 are normally outputs.  But, the diode load feeds the noise
limiter which feeds the audio amp, so feeding audio into the R-390A could
be done by removing the link on contacts 14 and 15 on tb 103 and feeding
audio into it at contact 15.  And, the noise limiter would need to be off
and the impedance is about 50k ohms.

I have heard of this being done and would prefer this method versus using
an external audio amp.

Regards, Larry

On Sun, Jan 19, 2020 at 12:15 PM jm <josemic at gmail.com> wrote:

> I have seen on ebay an external product detector without make or
> manufacturer signs. It is identified as SSB-1A Product detector.
>
> It is one of the several devices that I've found to connect to the IF
> output of the r390a. Until now I have seen similar circuits that needed an
> external audio amplifier to perform their function.
>
> This one is different because the connections are marked as Diode load and
> IF out. It surprises me that one of them should be an input to the r390a. I
> thought (erroneusly perhaps)  that both diode load and If are outputs of
> the receiver.
>
> I don't find out what the way of operating on this configuration is
>
> This is the link
>
>
> https://www.ebay.com/itm/SSB-1A-Product-Detector-for-R-390A-Receiver/283743872204?hash=item421073e4cc:g:FeEAAOSw1kpeHhZn
>
>
> Someone could shed some light about?
>
> Regards
>
> Jose
> EA8DCP
>
>