[HBR] Beam deflection mixers

Peter Bertini radioconnection at gmail.com
Mon Sep 12 13:30:27 EDT 2011


Those mixers are a good way to pick up extra rejection of IF signal blowby,
especially
for sets using 1st IF frequencies in the new
expanded AM band.

Pete
On Mon, Sep 12, 2011 at 6:41 AM, Shoppa, Tim <tshoppa at wmata.com> wrote:

> WV1D publishes some Squires-Sanders SS-1R test results:
>
> http://www.w1vd.com/SS-1R.html
>
> When used in single conversion, it beats the pants off everything else out
> there at the time in terms of dynamic range. (Well, except a R-390.)
>
> But in the 60's specsmanship was all about sensitivity (uV then... MDS
> today.). Even today we see folks bragging about their receiver's ability to
> pick up 0.03uV on the bench... and somehow ignoring that the atmospheric
> noise on the lower bands is 100x stronger :-).
>
> Of your two beam deflection mixer schemes, it seems to me too that method
> (a) would offer highest linearity. But method (b) was surprisngly popular.
> The real test would be a comparison via measurements.
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