> Contrary to my earlier statement my K3's main RX does show an RF gain
> non-linearity.
I certainly don't see any non-linearity here in either the K3 or KRX3.
Using your "angle" references (RG/RG$ are the RF Gain values reported
by the CAT protocol):
--- MAIN ------ ---- KRX3 ------
RG; ADC dBV RG$; ADC dBV
CW 250 239 0 250 239 0
0 228 210 - 0.5 231 213 - 0.1
45 182 164 - 4.2 181 169 - 4.2
90 130 114 -16 132 124 -17
135 90 77 -34 91 86 -35
180 47 46 -51 50 49 -51
CCW 0 02 -85 0 02 -85
The compression at the "top end" is expected since the -73 dBm signal
is well above the AGC threshold until the RF/IF gain is reduced to
about the 12:00 (90 degree) position.
K3 s/n 1450 firmware 4.14, DSP 2.60. Both receivers are calibrated
using the XG-2 on 20 meters with K3 Utility 1.1.10.15.
73,
... Joe, W4TV
On 10/26/2010 3:23 PM, hb9brj wrote:
>
> After reading all comments, I performed an RF calibration using a -73dBm
> source and the K3 Utility 1.3.10.15. First run with factory defaults, second
> run using my signal source. A picture tells more than a lot of numbers:
> http://home.datacomm.ch/hb9brj/RFgain.jpg
>
> X axis = RF gain position angle in degrees: 0 = 3 o'clock, 90 = 12 o'clock,
> 180 = 9 o'clock
> Y_left = CONFIG:SW TEST SCN ADC readout of RF gain pot
> Y_right = DISP AFV in dBV
>
> Contrary to my earlier statement my K3's main RX does show an RF gain
> non-linearity.
>
> Markus
> 1505
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