G5RV SR SWR problem

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by N0RTR, Jul 13, 2011.

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  1. KB1CKT

    KB1CKT Ham Member QRZ Page

    Ditto. The problem is, unless if you spend several hours reading up on any given antenna before buying, one gets caught by snake oil. I've been bit by it too, on the G5RV. [Then again, I've made wonderful contacts on 17m on mine!] Old ad copy never dies. Too bad an antenna company, wanting to make a respectable name for itself, couldn't just start advertising their build of it as 80/40/20 instead of 80-10. They'd probably not be able to sell it, even though it'd be just as good as anyone else's.
     
  2. N0RTR

    N0RTR Ham Member QRZ Page

    Well i do have to say that I am happy with my g5rv, were I live I have little noise and have made some great contacts. I like it that you have to tweek it here and there to find what works best for it. Then again it has been the only hf antenna that I have operated on.
     
  3. W5DXP

    W5DXP Ham Member QRZ Page

    On the contrary, the G5RV indeed does work multiband efficiently - it just doesn't work all-band efficiently.

    The G5RV is an efficient antenna on 80m, 40m, 20m, and 12m - not on 30m, 17m, 15m, and 10m.

    The G5RVjr is an efficient antenna on 40m, 20m, and 10m - not on 80m, 30m, 17m, 15m, and 12m.

    The G5RVsr is an efficient antenna on 160m, 80m, 40m, and the WARC bands - not on 20m, 15m, and 10m.
     
  4. N0RTR

    N0RTR Ham Member QRZ Page

    I have made contacts on 10, 15, 20, 40, and 80m on my SR all with sent and receive rst of 57-59 and that is working dx as well as conus
     
  5. EI4GMB

    EI4GMB Ham Member QRZ Page

    You will make contacts on all of the bands you mentioned. But as Cecil says the antenna won't be as efficient on some of those bands.

    Kind Regards

    Fred EI4GMB
     
  6. W5DXP

    W5DXP Ham Member QRZ Page

    Here are the series section feedpoint impedances and SWR on the coax for all three types of G5RVs according to EZNEC.

    G5RV (102’/32.8’)

    3.8 MHz, 15.5 + j26.3 ohms, 50 ohm SWR 4.2:1
    7.2 MHz, 27.3 - j16.9 ohms, 50 ohm SWR 2.1:1
    10.125 MHz, 50 + j400 ohms, 50 ohm SWR 66:1
    14.15 MHz, 99.3 - j0.02 ohms, 50 ohm SWR 2:1
    18.14 MHz, 28.7 - j145 ohms, 50 ohm SWR 17:1
    21.3 MHz, 36.4 + j227 ohms, 50 ohm SWR 30:1
    24.95 MHz, 114 + j179 ohms, 50 ohm SWR 8.2:1
    28.4 MHz , 120 - j529 ohms, 50 ohm SWR 49:1

    G5RVjr (51’/15.6’)

    3.8 MHz, 0.9 - j400 ohms, 50 ohm SWR 3600:1
    7.2 MHz, 16 - j33 ohms, 50 ohm SWR 4.6:1
    10.125 MHz, 117 + j420 ohms, 50 ohm SWR 33:1
    14.2 MHz, 54 - j6.85 ohms, 50 ohm SWR 1.2:1
    18.14 MHz, 112 + j540 ohms, 50 ohm SWR 55:1
    21.3 MHz, 660 - j1473 ohms, 50 ohm SWR 79:1
    24.95 MHz, 32.8 - j251 ohms, 50 ohm SWR 41:1
    28.4 MHz, 16.7 - j0.9 ohms, 50 ohm SWR 3:1
    50 MHz, 26.7 + j42.2 ohms, 50 ohm SWR 3.5:1

    G5RVsr (204’/61.5’)

    1.9 MHz, 9.4 - j17.7 ohms, 50 ohm SWR 6:1
    3.8 MHz, 14.8 - j16.6 ohms, 50 ohm SWR 3.8:1
    7.2 MHz, 122 - j2.2 ohms 50 ohm, SWR 2.4:1
    10.125 MHz, 22.4 - j54.3 ohms, 50 ohm SWR 5.1:1
    14.2 MHz, 1485 + j1711 ohms, 50 ohm SWR 69:1
    18.14 MHz, 43.7 - j50 ohms, 50 ohm SWR 2.8:1
    21.3 MHz, 192 - j416 ohms, 50 ohm SWR 22:1
    24.95 MHz, 28.2 + j18.6 ohms, 50 ohm SWR 2.1:1
    28.4 MHz, 496 + j948 ohms, 50 ohm SWR 46:1
     
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