I've been using the 6903x for a couple months now, and have been collecting info on a few issues relative to using Crazyscan's implementation of an RF scan that the 6903x doesn't normally support.
About a month or so ago, I started creating a web page with some observations about how the RF scans seem to be collections of 72 MHz segments of narrower scans, similar to what drdude described for how scans done with HackRF SDR are a compilation of multiple 20 MHz scans. I got off track with some other projects, but got back into the 6903x issues a few days ago, when I discovered that there seems to be a curious and significant issue with some 6903x scans on C-band satellites. So I've started a 2nd web page describing what I found on that topic.
I've put the first discussion about discontinuities caused by the 72 MHz segments at:
http://www.eskerridge.com/bj/sat/6903x/00-6903x-segments/TBS-6903X%20and%20SDR-FFT%20Scans.html
I hope the spaces don't mess up this link if it does, try:
http://www.eskerridge.com/bj/sat/6903x/00-6903x-segments/TBS-6903X-and-SDR-FFT-Scans.html
and I've put my newer discussion of the C-band issues at:
http://www.eskerridge.com/bj/sat/6903x/segment-reversal/00-6903x-cband-discontinuities.html
In short, I did a 6903x scan of the vertical C-band side of the 107.3 Anik sat, which has some interesting narrow bandwith signals in the first 72 MHz segment and last 72 MHz segment.
The interesting thing is that the first and last 72 MHz segment showed up as being reversed in the 3700-4200 MHz scan while the segments in between are not reversed. If the scan is done in L-band mode, all segments in the 950-1450 MHz scan are in the proper order.
Ie, 3700-4200 MHz C-band scans are actually naturally reversed due to the subtraction from the 5150 LOF, and for some reason the first and last segment of the 3700-4200 MHz scan are not reversed while the segments in between are.
Anyway, I have yet to check out other C-band scans to see if the same thing happens, but I thought I would post what I've observed to see if other people see the same thing or if it is just me???
About a month or so ago, I started creating a web page with some observations about how the RF scans seem to be collections of 72 MHz segments of narrower scans, similar to what drdude described for how scans done with HackRF SDR are a compilation of multiple 20 MHz scans. I got off track with some other projects, but got back into the 6903x issues a few days ago, when I discovered that there seems to be a curious and significant issue with some 6903x scans on C-band satellites. So I've started a 2nd web page describing what I found on that topic.
I've put the first discussion about discontinuities caused by the 72 MHz segments at:
http://www.eskerridge.com/bj/sat/6903x/00-6903x-segments/TBS-6903X%20and%20SDR-FFT%20Scans.html
I hope the spaces don't mess up this link if it does, try:
http://www.eskerridge.com/bj/sat/6903x/00-6903x-segments/TBS-6903X-and-SDR-FFT-Scans.html
and I've put my newer discussion of the C-band issues at:
http://www.eskerridge.com/bj/sat/6903x/segment-reversal/00-6903x-cband-discontinuities.html
In short, I did a 6903x scan of the vertical C-band side of the 107.3 Anik sat, which has some interesting narrow bandwith signals in the first 72 MHz segment and last 72 MHz segment.
The interesting thing is that the first and last 72 MHz segment showed up as being reversed in the 3700-4200 MHz scan while the segments in between are not reversed. If the scan is done in L-band mode, all segments in the 950-1450 MHz scan are in the proper order.
Ie, 3700-4200 MHz C-band scans are actually naturally reversed due to the subtraction from the 5150 LOF, and for some reason the first and last segment of the 3700-4200 MHz scan are not reversed while the segments in between are.
Anyway, I have yet to check out other C-band scans to see if the same thing happens, but I thought I would post what I've observed to see if other people see the same thing or if it is just me???
Category: Computer and USB Satellite Receivers and Recording