[Elecraft] K2 phase noise

[G3VVT at aol.com]

In a message dated 18/03/05 07:33:11 GMT Standard Time, s55m at siol.com  writes:

For  detailed
information (in numbers) i still need some peace of equipment  (step att).I
was going from transverter output (abt 1mW sig) directly to a  HF RX.Of
course, i was increasing noise all over the band but that was not  the
problem.When i TX in SSB without modulation there are thousends of  little
birdies (none on CW) all over the entire band, way down from the  level of
carrier, but there.


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It is not considered good practice to feed effectively what is a low power  
transmitter directly into a receiver input as it can cause all kinds of 
distress  to the receiver.
 
1mW or 0dBm is about 225mV PD across 50 ohms.
The normal S9 level of 50uV PD is -73dBm. This means that 73dB  over S9 is 
hitting the receiver front end.
 
It will almost certainly show definite signs of distress!
 
Try the test again with a suitable attenuator in line to bring the level  
down S9 or slightly above. i.e. -70 to -80dB of attenuation.
 
Bob, G3VVT