...Linux boxes are very slow and sometimes not able to detect all signals (particularly when very low SRs are used), and many images for those boxes are not DX oriented...
I have not found the Octagon SF8008 (Linux) to be a very slow box.
If you use the Open ATV image on an Ocatgon SF8008 you have fast blind scan, it can capture low symbol rates and it allows the user to select the frequency range, the polarity and the SR range.
Personally, I have found the OpenViX images coupled with the Simple Ten Eighty skin to be user friendly on linux boxes.
With respect to
very low symbol rates, what values do you consider very low and what currently produced satellite receivers are capable of detecting signals with these very low values?
As far as I am aware, the best two receivers for this are possibly the GTMedia Combo (android) and the Octagon SF8008 (linux)?
However, there are possibly other satellite receivers I am not aware of that are capable of
very low symbol rates?
I do not know of any currently produced android box or closed source box that can match the SF8008 options for selection of frequency range, polarity and SR range.
The older closed source receivers used to allow selection of frequency range, polarity and some functionality for selection of the SR range.
As for Technomate, I am not sure how many of their fan boys are left standing after the launch of the TM-5402 (M4)?
Personally, for blind scanning my hardware of choice is a Dr HD F15 receiver, a TBS6983 card and an Octagon SF8008.
The Dr HD F15 receiver and the TBS6983 card (with EBSPro v18, CrazyScan and DVB Dream) can indicate signal levels below a lock level, a useful option if the DX Man is without an analyser.