Posted by
Edward R Cole on
Aug 21, 2011; 5:37pm
URL: http://elecraft.85.s1.nabble.com/Tunable-carrier-birdie-20445khz-tp6709029.html
Just for fun I tested the response of my K3 to external signals with
ANT1 directly terminated with a 50-ohm term (no coax). The radio has
2m transverter connections, 6m preamp in/out, and both IF out
connections, 10-MHz Ref cable, keys and Inhibit control lines
connected to ACC per usual set up.
Using my XG3 is a signal source on 14.020, I get an S3 signal in CW
with 0 dBm level, but nothing is heard at -33 dBm. I think this
indicates pretty good shielding. I would doubt that external birdies
would be heard with ANT terminated. They would have to be very
strong, radiating from something in the shack, to be heard.
Therefore, making internal birdie survey should work well if you
terminate the antenna (use no coax).
PS: test with ANT1 open with no cable connected is the same. I did
note than if I placed the XG3 antenna over the speaker grill of the
K3 I could get a weak signal at -33 dBm.
Note: My XG3 is installed in a diecast Hammond box with BNC
connector so radiation is only via the BNC connector to a 2m rubber
duckie. Using this enclosure with a 20-dB fixed and 30-dB step
attenuator I can reduce the XG3 signal to -157 dBm for testing my eme
system at the preamp input.
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
DUBUS Magazine USA Rep
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