[TenTec] Orion I V2.055 Spurious Response

[Sinisa Hristov]

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