Merle Bone wrote:
> However, before I quit, I tried the test one more time on 40M - LSB - (S9
> Signal 7074.9-7078) and I did find - but barely perceptible (I had to run the
> test several times to even get the frequency range due to the signal
> weakness) a "reverse spur" from 7078.9 to 7081. This spur was really at the
> edge of the "minimum discernable signal" from my observation - I did not do a
> calibrated attenuation to see where it was not discernable. I then switched
> to USB. The S9 signal was from 7075 to 7071.8 and the - again the barely
> perceptible - reverse spur was from 7071.4 to 7068.4 .
By "S9" do you mean -73 dBm level or just "9" on the S meter?
My test was done with a known level in dBm, preamp on, attenuator off.
As my Orion was still open, I made a quick test by feeding 14 kHz signal
directly to ADC input on A7 board. The spurious response is present there,
so it is, at least in part, a DSP probblem.
73,
Sinisa YT1NT, VE3EA
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