image

Search:

Type: Posts; User: lizard; Keyword(s):

Page 1 of 4 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    2,134
    Views
    378,343

    Sticky: Wow. 400km/h, really great. Maybe try a...

    Wow. 400km/h, really great.

    Maybe try a TPPower motor for the next record attempt, they run cooler than Leopards and are available in all kinds of sizes and windings.
  2. Replies
    4,671
    Views
    756,196

    Why not a highpass with a higher frequency, you...

    Why not a highpass with a higher frequency, you could have had around 60db attenuation on 900MHz (?)
  3. Replies
    4,671
    Views
    756,196

    Try a Minicircuits VHF-2100 on the VRX. If that...

    Try a Minicircuits VHF-2100 on the VRX. If that is still not enough, try a Minicircuits VLFX-950 on the Crossfire TX.
  4. Replies
    4,671
    Views
    756,196

    What frequency was the crossfire and the Video...

    What frequency was the crossfire and the Video RX/TX on?

    Doing this test with disconnected antennas at the RX does not give accurate results when testing for interference. The interfering signal...
  5. Replies
    4,671
    Views
    756,196

    The lowpass filter will attenuate higher...

    The lowpass filter will attenuate higher frequencies. But I find it still weird that the peaks are not at the harmonic frequency. Maybe it's not coming out of the antenna, then low pass filters won't...
  6. Replies
    4,671
    Views
    756,196

    Hmm, not sure I understand the results. The 3rd...

    Hmm, not sure I understand the results. The 3rd harmonic when running the Crossfire on 868Mhz is on 2604Mhz. But not sure what the exact frequency range it hops on is. Can you set the RFExplorer to...
  7. Replies
    4,671
    Views
    756,196

    Would be nice to see a spectrum analyzer screen...

    Would be nice to see a spectrum analyzer screen and a dBc value for the 3rd harmonic on 2604Mhz to get an idea of how much filtering and separation is needed to make it work properly.

    I'm not...
  8. Replies
    4,671
    Views
    756,196

    Thanks for the info. Well, crap. 1.3g...

    Thanks for the info.

    Well, crap.

    1.3g video doesn't work properly because it's too near to 868/915Mhz and swamps the video receiver directly (not TBS's fault though), 2.4g video doesn't work...
  9. Replies
    314
    Views
    53,786

    I think the only way to solve this problem is by...

    I think the only way to solve this problem is by using an interdigital filter on the video RX. Everything else is not narrowband and steep enough and/or doesn't provide enough attenuation.

    A...
  10. Replies
    4,671
    Views
    756,196

    Did you do a test near the end of reception range...

    Did you do a test near the end of reception range or a bench test with an attenuator on the VTX? Not doubting your experience, it's just that it's not noticable when the VTX signal is strong.
  11. Replies
    4,671
    Views
    756,196

    Has anybody measured the third harmonic yet (or...

    Has anybody measured the third harmonic yet (or can TBS maybe comment)? 868x3=2604MHz is quite near to the 2.4GHz band, when the Crossfire is transmitting at 2W I'm wondering if the 2.4G band stays...
  12. Replies
    93
    Views
    14,200

    Yeah, matching 1,3ghz Tx/Rx combos with proper...

    Yeah, matching 1,3ghz Tx/Rx combos with proper image quality and that pre-emphasis stuff that 5.8g equipment has. And a diversity RX that uses image quality as a basis for the video switching like...
  13. Replies
    93
    Views
    14,200

    Hey Sander, any news on this? I really would like...

    Hey Sander, any news on this? I really would like to have some quality 1.3g equipment.
  14. Replies
    0
    Views
    3,505

    Dual or Quad 2.4Ghz CPatch for diversity?

  15. No, I didn't mean the "cinema" 2.35:1 or 21:9...

  16. You're right, many of the small monitors we use...

  17. Adding an amp is possible in general. Problem...

  18. Really weird this whole aspect ratio thing.... Is...

  19. Thread: 16:9 camera?

    by lizard
    Replies
    0
    Views
    802

    16:9 camera?

  20. I'm thinking about building a compact diversity...

  21. Yeah, definitely, one should also think about...

    Yeah, definitely, one should also think about other users on the spectrum.

    Although I plan to use 433MHz for control, I will nevertheless put a lowpass filter on my 1.3G vtx.
  22. You mean you tested the response of the filter...

    You mean you tested the response of the filter and it was -18db at 2300 and 2550MHz? Yes, that fits the with measurements of the filter in the PDF I linked and supports my statement.




    Hey,...
  23. I have a DVB-T stick "spectrum analyzer" that...

    I have a DVB-T stick "spectrum analyzer" that goes only up to about 1700Mhz, so I cannot really "see" what's going on at those freqs. I can only see it emitting something around 420Mhz. But I can...
  24. That is exactly what I'm not sure about. The...

    That is exactly what I'm not sure about.

    The vtx is not emitting any RF energy between 2400 and 2500 MHz. So in my understanding, there is nothing to clean out between 2400 and 2500MHz, because...
  25. IBCrazy 1.3/2.4GHz notch filter center frequency

    I have a question regarding the IBCrazy/VAS notch filter for 1.3G video with 2.4G control. I am not sure I understand this right.

    Technical data on the VAS website says:
    Passband: 1220-1360MHz...
Results 1 to 25 of 97
Page 1 of 4 1 2 3 4