[Orion] USING ORION'S RECEIVER

[Sinisa Hristov]

BarryG wrote:
 
>  Thanks for preparing the document and sharing this info Sinisa.

It was my pleasure.


> The 15dB fall-off for AGC Threshold setting is more than I was using and I look forward to > experimenting with your guidelines.

I took advantage of the fact that AGC THRESHOLD does not affect signal to noise ratio
significantly and specified 15 dB to be on the safe side. "Exact" noise level
is difficult to judge, and if a long-time noise level average is used for better accuracy,
then the threshold must be substantially above it to provide enough room for noise peaks.
Interpreted this way, the 15 dB rule leaves only a few dBs of margin.


> the sensitivity adjustment you suggest for my Orion works out to simply rx preamp off for
> me, which is how I had been using it.

I'd expect sensitivity setting to be much lower on 1.8 MHz than it is on 28 MHz,
but of course it depends on local circumstances.


73,

Sinisa  YT1NT, VA3TTN