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DomW

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Reply with quote  #16 
To make this easier, is there a program or site that will tell me what actual satellite foot prints I am in or more with my Lat. Long.?
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big_hemi

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Reply with quote  #17 
Just a heads up, I combined Dom's two separate threads into this thread.
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DomW

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Reply with quote  #18 
That works, Thanks
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wejones

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Reply with quote  #19 
Quote:
Originally Posted by DomW
.......To the SDR. I had several radios to cover different bands, the Icom R7000 was my workhorse. I had hacked a WJ pan-adapter to view its IF. I used a HP8551 spectrum analyzer to look at whole c-band transponders. When I started looking at SDR the FunCubeDongle was it for under $1000. I looked at Ettus USRP SDR radios and liked what I saw. Latter Ettus brought out the more affordable B200, USB 3.0 (with a couple compatibility MB USB 3 chipset caveats) for ~$650. It covered 70Mhz to 6Ghz continuous, 56Mhz could be digitized/viewed at one time. I wanted to be able to pull in the entire band (FM broadcast, aircraft or trunked systems etc) and then demodulate several signals at once. And to do this I have had to learn GnuRadio, Yet Another Learning Experience. GQRX works well with it. If Airspy had been available then I would have gone with it as I did not plan on transmitting and it is more compatible with the hobby type software. Check out the Ettus B series mini boards.
  Dom


Thanks.  I too have an Icom 7000, and have an HF converter to allow it to cover the 0-25 MHz band. I used to use it for FM^2 and SCPC sat signals.  It's getting old now, but I still use it occasionally to determine SRs of new transponders.
  Re SDRs, I currently use one of those ~$15 RTL-SDR TV dongles with SDR-Sharp in windows and have also experimented with the help of members here with GnuRadio mainly in Windows, but a bit with Linux.  It does a fairly nice job as a spectrum analyzer, although it can only see about 2 MHz of spectrum, so only the lowest of SRs can be viewed. With GnuRadio I was also I was looking at Airspy, SDR-Play, HackRF, BladeRF, and USRP-1, which have bandwidths of 10, 8 20,40, and 64 MHz respectively, but of course the price goes up dramatically with the wider bandwidths.
    The USRP-1 seemed great since it would be wide enough to see virtually any sat transponder, and I was starting to talk myself into getting that even though reviews said that it cost about $700, but then on going to their web page, it looked like you had to buy the USRP-1 box/motherboard for $719 and then the cheapest RF daughterboard was the DBSRX2 for $155, so the price then jumped up to above $874, which is getting pretty much out of range, plus I don't think the USRP-1 is compatable with the SDR-Sharp that I use, so I'd probably have to buy additional software, unless I can figure out how to use it with GnuRadio.
    But the Ettus B series you mention sounds interesting, bringing the price down to where it's almost within range, although we have some recent money issues here so any price might be out of range.  But before jumping into that, I've got to do some more reading to see just what software I can use with it.  I also use my current SDR to do ADSB aircraft monitoring, but I guess I can continue to use the old cheap one to do that.  I use a nice linux dump1090 program that acts as a server to stream the ADSB data over my LAN to my windows computers.  I don't know if this Ettus B200 is compatable with the dump1090 program or not. 
    Anyway, thanks.  I have a lot of reading to do.

wejones

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Reply with quote  #20 
Quote:
Originally Posted by DomW
To make this easier, is there a program or site that will tell me what actual satellite foot prints I am in or more with my Lat. Long.?

There are lots of programs that will tell you if you have line of sight visibility to satellites, but in general, you have line of sight (ignoring obstructions like hills, trees and buildings) if the satellite longitude is within about 64 degs of your longitude, +/- a couple degrees depending on several things, such as a bit more range at lower latitudes and less at higher latitudes.
   However, line of sight visibility does not insure that you will be in the footprint of the satellite, because that depends upon the aim of the antennas on the sat.  Probably your best reference for that info is the satbeams web page at http://satbeams.com/satellites?status=active

DomW

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Reply with quote  #21 
I know I got dump1090 working on my MacBook, but was probably using an RTL-SDR.

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Originally Posted by wejones


  I don't know if this Ettus B200 is compatable with the dump1090 program or not. 
    Anyway, thanks.  I have a lot of reading to do.


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DomW

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Reply with quote  #22 
Thanks, this helps.

Quote:
Originally Posted by wejones

  Probably your best reference for that info is the satbeams web page at http://satbeams.com/satellites?status=active


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DomW

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Reply with quote  #23 
Update:
[biggrin] TBS 6903 and coax have arrived. Got pipe for http://www.irv2.com/forums/f53/cheap-sd-carry-out-satellite-dish-and-tripod-136019-2.html I will update further, later.

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zorgc

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Reply with quote  #24 

Here is a SDR candidate for DVB use

LimeSDR is 100Khz - 3.8Ghz, 61.44 Mhz bandwidth, 12 bit ADC and a USB3 interface

https://myriadrf.org/projects/limesdr/

They sell it for $289

https://www.crowdsupply.com/lime-micro/limesdr
DomW

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Reply with quote  #25 
Could be. Check the reviews here http://www.rtl-sdr.com/tag/limesdr/ I am curious if these wide-band receivers could handle the signals that the DVB boards can not? Like NB or SCPS????? GnuRadio has a lot of modules, I just don't know how to put them together so they work.
   Dom

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zorgc

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Reply with quote  #26 
After posting this, I read in the ATSC 3 thread that updatelee has one, but has not yet tested it
DomW

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Reply with quote  #27 
Quote:
Originally Posted by zorgc
After posting this, I read in the ATSC 3 thread that updatelee has one, but has not yet tested it


Thanks, I'll do a search for that thread. If he writes anything for it, I hope he uses the UHD API as both your card and my B200 can use it.

FYI: USRP Hardware Driver (UHD), but that might be for GnuRadio only?????

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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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