Order Tray | Contact Us | Home | SIG Lists

[aprssig] Re: Multiple Radio Desense

Jim Lux jimlux at earthlink.net
Wed Mar 16 00:34:55 UTC 2005


From: "Robert Bruninga" <bruninga at usna.edu>
>>> "Jim Lux" <jimlux at earthlink.net> 3/15/05 5:50:37 PM >>>
>> The antennas were dipoles in free space with an assumed
>>
Yes we just assumed 40 dB Antenna isolation as a ball park
benchmark.  Two physical antennas 100 feet aprart can have
values +/- 6 dB or more depending on everything around them.
THus, we did not intend to be rigiorous, but just take an
assumed 40 dB isolation...

>A good test would be to use a high quality signal
>generator as the jammer.. then you'd know it was a
>receiver problem, not a Tx spurious signal problem.

Yes the tests were done with two signal generators
and a splitter.  Then extrapolated to "two antennas
about 100' apart" by adding 40 dB.
----------------------
Ohhhhh....

 Now I see. you were modeling the 100 foot separation and radios, you
weren't reporting the results of a field test.
Since we were both modeling based on some lab tests of the radios, it's not
surprising that the results are similar.


Jim, W6RMK






More information about the aprssig mailing list