Forums Airspy Thoughts

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This topic contains 17 replies, has 10 voices, and was last updated by  mightymik 4 months, 2 weeks ago.

Viewing 15 posts - 1 through 15 (of 18 total)
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  • #91

    Youssef
    Keymaster

    How would you use your 10MHz of spectrum?

    #98

    MaxMustermann
    Participant

    I whis i can stream many Audiofiles white one SDR# Application to stream all Radio Streams in my Area in my MediaCenter and Cell Phone.

    #99

    scancapecod
    Participant

    Searching for new signals and for DX during tropo band openings. Being very close to the shore of the east coast of the US opens a lot of opportunities for doing so. Being able to view the signals and click to tune during such band openings really maximizes the experience.

    Scott
    Webmaster – Scan New England

    http://www.scan-ne.net

    #109

    EA4GMZ
    Participant

    Maybe the GPIO signals can be used to electronically switch antennas for direction finding experiments?

    I think the qualitative step ahead is not the ability to monitor many narrow band signals, but wide band signals like digital terrestrial TV, DAB/DAB+ radio, L band satellite signals or ADS-B transponders. Would it be possible to decode HRPT weather sat images?

    I take for granted that it will have better selectivity than Funcube Dongle, which is useless in vhf without a dedicated filter.

    #112

    Youssef
    Keymaster

    That’s a very good idea. The MCU can control the antenna switching and put flags on the packets sent to the host.

    #113

    yo2ldk
    Participant

    Maybe would be great to switch via CAT frequency of transceiver; if selecting a frequency on the SDR# spectrum.

    #117

    boteman
    Participant

    I take for granted that it will have better selectivity than Funcube Dongle, which is useless in vhf without a dedicated filter.

    I do not take it for granted that the Airspy won’t require some kind of filtering in urban areas with high r.f. density. I have no idea how much interference can be mitigated in software, but the analog “front end” (such as it is) remains analog and can generate spurious signals given a strong enough signal or combination of strong local signals.

    I love the potential of a “DC to daylight” receiver. My ideal application would be as a replacement for a general purpose police scanner, but being broadband is a trade-off. Maybe a device containing a series of bandpass filters tuned for common bands selectable by the GPIO would make a nice companion for the Airspy?

    #121

    Youssef
    Keymaster

    The band switched filters can be a nice addition. Yep.

    #135

    yo2ldk
    Participant

    if recording plugin is still available for airspy, can you add VOX option ?
    ( to record only when audio signal is present, or squelch open )

    #154

    rmozel
    Participant

    Your project has arrived just in time and looks very promising, congratulations.

    I guess this will have a far better oscillator than RTL series of receivers.

    Some form of clock sharing between units (i.e., clock in/out) may lead to a number of interesting possibilities I guess.

    Will it be possible to include put some DDC/resampling/subchannel capability to MCU side or all the major processing will be handled by the PC hardware?

    #162

    Youssef
    Keymaster

    Thank you. There is already some kind of DDC/decimation to be done in the firmware in order to get, for example, the 2.5MHz at the center of the sampled spectrum. But frankly, I’d recommend doing it in the host for heavier processing. In any case, the firmware is open and I expect many exotic applications to appear.

    #175

    GW6KZZ
    Participant

    Youssef, why did you not consider going USB3 with backwards compatibility to USB2 for this device? You might gain better power options with USB3 over USB2 especially when you are monitoring 10 MHz bandwidth. I love your idea of the device and I can already envisage 2nd and 3rd generations. I think Howard and his FUNcube Pro and Pro+ found that, especially with the need for switchable SAW filters. I would have liked to see a Nano GPS chip on the circuit so we can add a date stamp to anything recorded too. Best of luck with the project and look forward to receiving one too,
    Chris,

    #181

    scancapecod
    Participant

    Hi Chris,

    For what it’s worth, I’m glad Youssef has kept the initial release of Airspy at USB 2.0. I own a Nuand BladeRF and went through weeks of nightmares to get it to work properly with USB 3.0. The “problem” was that I’m running Windows 8.1 on the two PC’s I use in the radio room. Both have Intel USB 3.0 chipsets. Intel has refused to write a driver for Windows 8.1 because Windows “supports” it natively. Um….no. I ultimately wound up having to buy a Startech USB 3.0 PCI-E 4 port card to get the BladeRF to talk to my Windows 8 PC at USB 3.0 speeds. The saga of SDR’s vs. USB 3.0 is a long one; the USRP USB 3.0 devices that Ettus Research manufactures have similar nightmarish issues.

    I’m glad he’s kept it simple for now. I think there will be a lot more owners of the Airspy as a result, and eventually USB 3.0 will stabilize. It doesn’t sound to me like using 2.0 instead of 3.0 is a big issue for the performance of Airspy as it exists now.

    Regards,

    Scott

    #182

    Youssef
    Keymaster

    Thank you for the kind words. The chip we’re using doesn’t support USB3, only USB2 but it operates flawlessly in high speed mode. Howard did an amazing job with the first funcube dongle and the update was such an excitement an a good surprise to all of us. Speaking of GPS, you can always use an external GPS disciplined 10MHz source and use the timestamping. In think the same can be achieved using the exposed SGPIOs and a cheap GPS receiver, but with less precision.

    #183

    GW6KZZ
    Participant

    Thanks Scott for your comments, I totally agree about USB3 not fully stabilised yet and I am staying totally away from Windows 8 because I do not like the tablet type software, DOS, Command and Windows are great, Windows 8.1 is another beast, and a nightmare has you rightly say, lol. I use ASUS p8z68-v pro/gen3 motherboards and have also had USB3 issues but I also have two computers exactly the same with 512 GB SSD, 14 TB of HDD space and dual graphics to do things with too.

    Youssef, thank you for your comments too, you are very welcome to my kind words, your clear and nice style of programming is a delight to see and read, SDR# etc. programs are great working tools we all can use. OK on the GPS, I need precision time and location when mobile and just accurate time when at home on the base station so I will have to go down the route of an external GPS disciplined 10 MHz source, may be the G3RUH GPS stabilised oscillator?

    One additional thought, I would like to see built into all SDR receivers is Ethernet and possibly POE points; the closer I can put the SDR receiver to the antenna the better and then plug it into the local area network so I can use it anywhere in the house on a single or multiple computers and reduce signal loss to a minimum too. I like the idea of your prototype enclosure, room enough to put a second board or additional sockets. The more facilities or functions you build into it the better for me Youssef, these SDR hardware and software have opened up so many projects, the world and space contain all new possibilities to play with.

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