[Elecraft] K2 Volume vs RF Input

[John, KI6WX]

Several folks have posted notes asking about the audio volume out of a K2
with a given signal input.  I have measured my K2 using a calibrated signal
generator to drive the input.  I don't know if it is typical, but the
results are below if anyone wishes to compare their K2 to these numbers.

Test conditions:
Frequency: 7.1 MHz
Signal generator power: -73 dBm (50uV into 50 ohms)
RF Gain: Full CW
AF Gain: 12 o'clock
Opt=PERF
Audio output: 600 Hz measured across speaker terminals in volts RMS
Serial #1083, No AGC Mods (50uV shows as S1 on S-meter with OP1 filter)

Following measurements made with No PreAmp or Attenuation
Rcvr Filter     AGC On     AGC Off
OP1                 0.12           0.20
CW, 0.7          0.19            1.1
CW, 0.4          0.19            1.0
CW, 0.1          0.15            0.56

Following measurements made with OP1 filter
PreAmp       AGC On     AGC Off
On                 0.21            1.33
Off                 0.12            0.20
Att On           0.07            0.08

-John
 KI6WX