Lenny,
Are your IF filters aligned so a 550Hz signal is within the passband.
With the K2, simply setting STP for 550 Hz will not do it, you must do
CAL FIL to make 550Hz appear well within the receive passband.
A properly tuned K2 will typically have a good response to a -140dBm
signal from the HP8640B.
It is easier to take the K2 to the signal generator than to lug that
heavy signal generator to the hamshack!
73,
Don W3FPR
On 7/1/2018 4:35 PM, w2bvh wrote:
I dragged my HP8640B out of the "lab" (basement) to the second floor
shack to do some antenna testing about a week ago. Before dragging this
50 lb instrument back down two flights of stairs I decided to do a quick
MDS measurement on my K2 and got some results I'm a little concerned about.
Yesterday I did an informal test. K2 set for cw, 1.5 KHz bandwidth,
14.05 MHz, AGC on, preamp off. Attached siggen, tuned the K2 to 550 Hz
tone and cranked down the siggen amplitude until the signal and noise
were about equal, "by ear". Siggen output was -130 dBm. This was enough
to cause me to look further.
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