[Elecraft] [K2] RX noise level

[Don Wilhelm]

Sergey,

I would believe they likely are OK - those numbers indicate that you 
have 12.95 dB gain for your Preamp, and that is near enough to 14 dB 
expected value shown on the schematic.  Note that .013 V = -33.74 dBm 
and .055 V = -21.21 dBm - simply subtract the two.  You should make some 
allowance for measurement error and round up to 13 dB.

If you are concerned about the absolute value of the receiver noise 
energy, a measurement of that nature is not valid.  Measure the MDS of 
the receiver and that will tell you how the receiver noise will affect 
your reception.

73,
Don W3FPR

Sergey Dan wrote:
> Hello
> I've measured K2's RX noise level (antenna terminated on 50 ohm, AGC OFF, AF
> and RF to max,
> DMM connected to P5), when PRE is ON N = 0.055v, PRE is OFF N = 0.013v.
> Are those levels OK for K2?
>
> Thanks
> Sergey.
>   
>