K2s transmitted phase noise

[Robert Mccormack]

At ZM1A (Multi-single/Multi-Two) contest station we had serious "key-up" wide-band noise problems with several different YaeComWood models - least obnoxious was the IC-780 plus Drake L4B, two sets of antennas separated about 100m, especially with both quads pointed at each other.

K2s (#767 and #3725)  plus a small external SS amp produced no discernible phase noise when driving a Sunair GL-1900B amp - bandpass ATUs on both stations.

Please note that these were not K2/100s, so maybe our experience is not relevant.  

We now use two K3s, amps at 500w output.
The K3s are so clean that we can operate within 3 kHz of 1st harmonic on CW.
No clicks, no de-sense, no phase noise - happy contesters.

73,
Ken ZL1AIH ( ZM1A in contests)

 

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[AJSOENKE]

One of the main reasons touted by Elecraft for many years is the low phase  
noise presented on the K2.
Some of the things that contribute to unacceptable phase noise levels can  be
attributed to incorrect alignment of circuits during build, inadequate  
shielding of CAT cables and bus interconnect cables. The K100 higher power  levels
will also have proportionately higher levels of 'corruption'. A damaged  or
poorly working interface cable from the K2 basic to the K100 bus panel can be  
picked up on the transmitted signal. Running a KW will certainly take any of
the  above and make it that much worse, hence a small almost unnoticeable tweak
at  the base level can make a big difference after 12 db of amplification.
 
Al WA6VNN
 
 
 
 
In a message dated 10/6/2008 10:55:34 P.M. Pacific Daylight Time,  
[hidden email] writes:
At ZM1A (Multi-single/Multi-Two) contest station we  had serious "key-up"
wide-band noise problems with several different YaeComWood  models - least
obnoxious was the IC-780 plus Drake L4B, two sets of antennas  separated about 100m,
especially with both quads pointed at each  other.

K2s (#767 and #3725)  plus a small external SS amp produced  no discernible
phase noise when driving a Sunair GL-1900B amp - bandpass ATUs on  both
stations.

Please note that these were not K2/100s, so maybe our  experience is not
relevant.  

We now use two K3s, amps at 500w  output.
The K3s are so clean that we can operate within 3 kHz of 1st harmonic  on CW.
No clicks, no de-sense, no phase noise - happy  contesters.

73,
Ken ZL1AIH ( ZM1A in  contests)






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