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Type: Posts; User: Strix technica

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  1. Replies
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    Good job, and I'm surprised to see a VNA so...

    Good job, and I'm surprised to see a VNA so cheap, considering. Still not cost effective unless you plan on making a lot of antennae but having fun is not always cost effective ;)

    I'd also note...
  2. I could have sworn that I'd seen references to...

    I could have sworn that I'd seen references to GSM950, including in the US, but a new search gets nada so either I remember wrong or what I read was a typo.

    In any event, the FA BP is no good for...
  3. I've seen plots like this before, and it kinda...

    I've seen plots like this before, and it kinda proves my point: the lower knee is at around 925 MHz and considering GSM900 downlink reaches up to 960 MHz, the FA BP filter is not sufficient to...
  4. Cool, sounds like it was painless enough. If...

    Cool, sounds like it was painless enough.

    If you haven't already, you might want to edit /etc/default/dump1090-mutability and set your lat/lon and also


    EXTRA_ARGS="--phase-enhance...
  5. If there's nothing of any strength near in the...

    If there's nothing of any strength near in the 900-1200 MHz range, your existing filter is probably good enough. Can't hurt to try if you want to eek out the last bit of performance, though, and can...
  6. It's also possible that fr24feed does its own...

    It's also possible that fr24feed does its own filtering before uploading data to fr24's infrastructure. It'd certainly make sense to use local processing power where possible.



    One positional...
  7. I certainly can't recommend Munin highly enough. ...

    I certainly can't recommend Munin highly enough. As a sys-admin, it has saved my butt on more than one occasion, and I've even been able to diagnose hosting company hardware faults before they were...
  8. I collect statistics directly from my dump1090...

    I collect statistics directly from my dump1090 instance using Munin, but I haven't bothered to sum the 5 minute reports to see whether plane count and position reports tally with the statistics page....
  9. In case you've missed it elsewhere, I've observed...

    In case you've missed it elsewhere, I've observed before that the FA filter's bandwidth is too wide to exclude some of the major sources of noise, notably GSM. If it's a problem in Europe (GSM900),...
  10. Yeah, I think trying the old antenna with the FA...

    Yeah, I think trying the old antenna with the FA stick and visa versa is definitely worth doing, as is giving some thought to the coax feeder. Golden rule of experimentation: change only one thing...
  11. D'oh! Thought it was 3, but they may have...

    D'oh! Thought it was 3, but they may have changed that.



    I look forward to hearing your results! Money is tight right now, but I'm awfully tempted to order one of those SAW filters because...
  12. Excellent! Can you post a link to its specs? ...

    Excellent! Can you post a link to its specs? It'll be interesting to compare the two (you should be able to post URLs now, I think).

    Based on what abcd567 said, the FA BP filter is an LC...
  13. That's a bit of a pity because the bandwidth of...

    That's a bit of a pity because the bandwidth of that filter seems too wide to exclude GSM signals, which means a negative result won't necessarily prove much. I know they're more expensive, but a...
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    158,210

    It should be noted that anything larger than 1/4w...

    It should be noted that anything larger than 1/4w or 1/2w has funky impedance characteristics and will require a matching network. Without it, you'll lose any benefit you might get from increased...
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    That's a complex question. Even if you had all...

    That's a complex question. Even if you had all three to test, which will perform best will, to a large extent, depend on your own circumstances and location (especially how built-up the area is and...
  16. Adding pads (attenuators) to a system that...

    Adding pads (attenuators) to a system that includes amplifiers (actually two in this case, up to +70 dB or more in aggregate) is counterproductive, to say the very least.

    Signal lost in the pads...
  17. This cavity filter...

    This cavity filter goes for €42 incl. VAT (which you won't pay if you're outside of the EU) so no, they don't all cost thee figures or substantially more than a SAW filter.

    Doubtless you can spend...
  18. Arg. I read what I expected to read, given the...

    Arg. I read what I expected to read, given the following:



    If it has the bandpass filter, then it's the blue Pro+.
  19. Or just buy a separate cavity or SAW filter,...

    Or just buy a separate cavity or SAW filter, which you get to choose, that has narrower bandwidth and higher order to knock out adjacent GSM signals.

    And I'd say that FA's BP filter is a poor...
  20. I suspected as much (re placement). Though...

    I suspected as much (re placement).



    Though it's "made" (likely re-wrapped) by the same company, that's no guarantee that the linked BP filter is equivalent to the BP filter in the Pro+ stick. ...
  21. PSU problems won't account for reduced a/c count...

    PSU problems won't account for reduced a/c count or range. If there were a PSU problem, something would have crashed or the USB link would have been broken.



    OP said it was the blue Pro+.
  22. Usually, problems with FA ProSticks are related...

    Usually, problems with FA ProSticks are related to too much gain but evidently, you've already seen to that. That said, 42 dB seems pretty high given there's (at least) a 20 dB LNA in there already,...
  23. That output says that fr24feed is running as...

    That output says that fr24feed is running as root, so you're alright there. The problem is somewhere else.

    And as Oblivian said, you're doing the right thing by logging in as 'pi' and using...
  24. @PizzaPilot, I'm running a FA Pro+ on a Pi3...

    @PizzaPilot,

    I'm running a FA Pro+ on a Pi3 with the Pi3's standard 2.0A power supply and no powered USB hub, and it works flawlessly. In fact, i've got two SDRs plugged in. But you've said that...
  25. If you don't have an environment in which...

    If you don't have an environment in which intermodulation noise is a significant problem, then it won't make any difference where you place the filter. You may or may not even benefit much from one...
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