Ron Hardin schrieb:

Is the 7030 any better than the R8B in suppressing a loud MW station
10 kHz away, when listening to the distant sideband of the wanted
station?

It should be, particularly when using the 2.something kHz (SSB) filter.
The 4 kHz filter with some offset via the PBS should also work quite
nicely, though. (IIRC it's a rather good Murata CFK filter, the wider
ones are rather ordinary CFWs. They do, however, benefit from
cascading.)

The R8B gets its agc hit by the unwanted station (which is really really
strong) in this situation and so makes the wanted station unlistenable.

So the synch selects one sideband but the AGC reacts because the signal
is still within the filter passband... kinda the problem a 7600G has in
SSB when a stronger station is talking on the other sideband.

I can't null the unwanted station because it lines up with the desired
station exactly. A little better tails on the passband might fix it.
We're talking about ripples I think, and how far down they really are.

The Radio Netherlands review states a rejection of 99 dB @ 10 kHz
distance for the 2.1 kHz filter, unfortunately there are no measurements
for the 4 kHz in the "Plus" but the 5.4 kHz filter (which in itself is
not too exciting) already obtained 65 dB. (Due to its cascaded filters
and low-noise oscillator, the AR7030 excels in terms of filters, no
doubt. The Drake uses coil filters at a 50 kHz IF, which are certainly
quite good but probably can't keep up with that kind of performance.)
Should things get really hairy, you can still manually adjust the AGC.

Stephan (whose AR7030+ still needs a Decent Antenna[tm])
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