[Elecraft] K2 a little deaf?

[Don Wilhelm]

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.
>