[Milsurplus] RBC

[George Babits]

Ken,

I wonder what percentage of cobbed up product detectors were really an 
improvement?  Maybe 10%?  I have had SX-28, R-388, R-390, Super Pros, and 
SP-600 receivers with prodector modifications.  All were pretty dismal. 
Tells me that the average modifyer really didn't know what he was doing.

73,
George
W7HDL


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "Milsurplus" <milsurplus at mailman.qth.net>
Sent: Thursday, June 16, 2016 9:31 AM
Subject: Re: [Milsurplus] RBC


> On 16 Jun 2016 at 9:12, George Babits wrote:
>
>> is now taken up with various HROs.  Every old receiver I have ever had 
>> that
>> someone added a product detector was pretty well ruined by the addition.
>
> That depends, hugely, on how it is done, George. I agree that most of 
> those "additions"
> were horribly bad. They were never thoroughly or well thought-out.
>
> However, in my own case, after some careful study, "back in the day", I 
> added a product
> detector to my very first BC-779, and the result was completely 
> astonishing to me.
>
> The apparent sensitiivity was increased many-fold, the overall 
> internally-generated noise
> level appeared to drop very significantly, and that receiver became my 
> very favorite receiver
> for CW and RTTY for as long as I had it.
>
> I could copy stations with that receiver I couldn't even hear with the 
> others I had in the
> shack.
>
> Its sensitivity and "quietness" was at least equal to my RBB, and I 
> thought at the time it was
> better. The two RF amp stages in the '779 made a big difference, I 
> suspect.
>
> It was amazing.
>
> In my opinion, there are only two areas in the design of receivers which 
> are true
> improvements since about 1939 or so: those are in AGC circuits, and 
> detector circuits.
> Otherwise, the modern stuff is simply "fooling around" with what went 
> before.
>
> The OT designers weren't stupid, and they did it all without 'pooters.
>
> Ken W7EKB
>
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