[R-390] receiver sensitivity testing

[Tisha Hayes]

If you are looking to test down in the -130's and -140's you would
really need to do it in a Faraday cage with a lab-grade signal
generator, precision RF connections and attenuators. There are just
too many variables and outside sources of noise to make any numbers
you get down there to be meaningful.

Everything would need to be buttoned up tight, every cover in place,
all the screws and modules completely in place, the best tube
line-up's in the right positions and pulling your monitored signal off
of the diode load connection to minimize distortion from the audio
deck.

One thing the R-390A does not suffer from is a lack of sensitivity. If
anything was to be done to enhance certain receiver characteristics it
might be to improve the selectivity and IP3 points. Roofing filters,
changes in the way the IF's are staggered tuned, etc... could all help
you with selectivity but at the trade off of any high fidelity
performance with the 16 khz filter position.


-- 
Ms. Tisha Hayes/ AA4HA
-
"Life isn't about how to survive the storm, but how to dance in the rain"