[R-390] Product detector

[Radio AI2Q]

Here's mine, Larry.

http://ai2q.org/Prod_det/detector.htm


Vy 73, AI2Q, Alex



----- Original Message ----- 
From: "Larry H" <dinlarh at att.net>
To: <r-390 at mailman.qth.net>
Sent: Thursday, September 28, 2017 4:08 PM
Subject: Re: [R-390] R-390a modified IF sub-chassis


> This mod does require a panel mod.  The original BFO switch needs to be 
> changed to a 2 pole 2 position in order to switch the audio.  This looks 
> pretty clear to me on the schematic Gary supplied.  This is the same 
> technique used by Lee's original mod.  So, this IF unit will not work in 
> another R-390A with out the associated wiring and switch change.
>
> Regards, Larry
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