Quote:
Originally Posted by rabbit73
...RSP Spectrum Analyser software (the software that you said has too many spurs). Some of the "spurs" are actually pilot carriers of weak ATSC signals. Some are noise spikes. Some are clock spurs that can be removed before a scan...
|
Yes, OK.
Quote:
|
..I have two CH3 folded dipoles. ...This tells me how much stronger a VHF-Low signal needs to be for a sufficient SNR above the ambient noise....
|
Understood.
Quote:
|
...If you want a specific test done...
|
Thanks.
Appreciate the offer, but not necessary.
Your several images in this thread provide a fairly good idea of what can be expected from the RTL-SDR devices.
-----------------------
One of the specific tests planned in KY:
To determine if the 3rd order IMD from a broadcast station can be seen on one of these devices. The station IMD3 is strongest very near the edges 6 MHz spread. However, those edges are also where the SDR-RTL internal IMD may be highest. Therefore, it may be difficult to see low level station IMD with such devices.
Another requirement for such an observation is for the broadcast station to be fairly well isolated from any other stations and have a high S/N ratio (in some case 50 dB or more). This condition may not be met in populated areas (cities, etc). There is a PBS station in rural KY that meets such criteria.
------------------------
Appreciate the patience, tests, and and images you have displayed in this thread and others.
.