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clanon

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Posts posted by clanon

  11. Posted · Edited by clanon

    The original FEED is for a 6' 7' 1,8mts 2.1 mts diameter GRILL

    Parabolic Antenna F/d ratio is important (te indica el tipo de iluminación necesaria par eficiencia mayor a: digamos 70 % , que es lo que se busca como objetivo)

    Having the original feed wouldn't be better to copy the original GRILL

    1 person likes this

  18. Posted

    I didn't want to make this antenna! The image was laid out as an example. Make a narrowband - no problem! I wanted a broadband antenna from AL. stripes.

    The same you built , BUT with FOLDED dipole DIRECTORS...Directional , high Gain , WIDEBAND

    s-l400.jpg

    AN220P.jpg

  19. Posted

    "As an example, consider two adjacent ports, both having reflection of -9.5 dB (VSWR=2:1), resulting in EVM=-19.0dB. From the Figure 1, error limits are +1.0/-0.9 dB and ± 6.4°.

    By reducing reflection of one of the ports to -20.8dB (VSWR=1.2:1), corresponding to EVM=-30.3dB, error limits reduce to ±0.3dB and ±1.8°.   It should be emphasized that amplitude and phase errors are exclusive, namely at a frequency where amplitude error peaks, the phase error is minimal and vice versa."

    "The effect of changed output VSWR with non-ideal load VSWR reflected by the system will cause additional amplitude and phase errors."

    PS: we tend to forget that THIS are NO OLD ANALOG RADIOS , Amplitud , PHASE and Frequency are USED for MODULATION (Higher the speed bigger the CONSTELLATION vg : 256QAM) and ALL are adversely affected by VSWR , impedance changes ,etc.You'll notice as a decreased speed due to the need for RE-TRANSMISSION...RXQ in LINUX