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Feed-lines (2/4/18 Edition)

edited February 4 in Sunday Ham Q & A

Tonight will be a discussion about feed lines, why they matter and the theory behind them to get the most signal out of your radio and out of your antenna.

Please join the net at 9:00 PM on 146.805 MHz or just listen in via Echolink via WA2MJM-R.

Quick poll below to get things started.

Feeding your antenna and keeping your radio happy
  1. What type of feed line are you using right now for your VHF radio?0 votes
    1. LMR-400
        0.00%
    2. Belden 9913
        0.00%
    3. RG-8
        0.00%
    4. RG-8X
        0.00%
    5. RG-58
        0.00%
    6. RG-174
        0.00%
    7. Nothing. Just an HT.
        0.00%
  2. What is your current SWR for your VHF antenna?0 votes
    1. 1.1:1
        0.00%
    2. 1.5:1
        0.00%
    3. Not good
        0.00%
    4. Not sure
        0.00%
  3. What are you using on HF?0 votes
    1. Not active on HF
        0.00%
    2. 50 Ohm Coax
        0.00%
    3. 300 Ohm Ladder Line
        0.00%
    4. 75 Ohm Coax
        0.00%
    5. 450 Ohm Ladder Line
        0.00%
    6. I am not telling
        0.00%
  4. BONUS: What is the closest impedance that allows for maximum transmit power transfer?0 votes
    1. 10 Ohms
        0.00%
    2. 20 Ohms
        0.00%
    3. 30 Ohms
        0.00%
    4. 40 Ohms
        0.00%
    5. 50 Ohms
        0.00%
    6. 60 Ohms
        0.00%
    7. 75 Ohms
        0.00%
    8. 100 Ohms
        0.00%

Comments

  • Great net tonight. Following participants:

    • AC2LP in the mobile with RG-58 coax feed line
    • K2LD at home using RG-8
    • K2BHM at home with an HT, so no feed line in use
    • KD2KJU at home using LMR-400
    • K2DED at home using LMR-400
    • N2ZRI at home using CableExperts 1318 similar to RG-8/RG-213/9913, etc

    The net focused on lengths of coax to avoid when using certain types of antennas on HF. More info here:

    http://www.hamuniverse.com/feedlinelengths.html

    We also talked about SWR measurement best practices and field strength meters.

    More info here:

    Any further questions/comments, please jot them down here as you never know who is reading along, much like never knowing who is listening on the 146.805 repeater.

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