[Elecraft] Tunable carrier (birdie) 20445khz

[Edward R. Cole]

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
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BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
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