Loop On Ground Antenna

Discussion in 'Amateur Radio News' started by KD5W, Jul 18, 2021.

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  1. KC2SIZ

    KC2SIZ Ham Member QRZ Page

    I always wondered what kind of receive antenna you could make with one of those!!
     
    M1WML likes this.
  2. KD5W

    KD5W Ham Member QRZ Page

    It's up to each person to decide what's enjoyable to them. That's what's great about this hobby, so many aspects to enjoy!
     
    K0UO likes this.
  3. AA4MB

    AA4MB XML Subscriber QRZ Page

    Great point. I care not one single whit about FT anything - for me, it's too much computing and not enough real radio. Thankfully, what I think shouldn't detract from those who do find it to be cool and the thing for them. I enjoyed playing with PSK and Olivia modes (and a couple earlier sound card modes. Not too bad - but looking at the FT modes, I just came away with ... 'nah' after loading it and playing with it a touch.

    As Onno, VK6FLAB is fond of mentioning from time to time, this is a hobby with almost endless facets. Folks should do what they like.
     
  4. KZ5R

    KZ5R Subscriber QRZ Page

    Unless I missed it in the thread, the balun should really be a 9:1. I believe you said it was wound to match the 75 ohm coax which will hamper performance. It should be wound to minimize the mismatch of the antenna feedpoint impedance to the characteristic impedance of the coax thereby reducing feedline loss. Typically a 9:1 is a better choice and the use of mix 77 beads will enhance low band performance. I have attached a pic for reference

    Bob, KZ5R.
     

    Attached Files:

  5. N6SPP

    N6SPP XML Subscriber QRZ Page

    Ref Antenna laying on ice- A family friend, KL3BD (sk) Bob Douglass from Kotzebue, AK (just above the Bering Land bridge) told us about the time he made the first 6m activation from up on Denali (Mt. McKinley) using a dipole laying on the ice. He wk'd a few stns on cw and phone, direct and via Es. Bob climbed Denali a few times. Any KL7- Motley & Bush Net hams reading this might have more info.
     
    Last edited: Jul 29, 2021
    W1YW likes this.
  6. K8PJM

    K8PJM XML Subscriber QRZ Page

    I live on a very small city lot with no chance for a long straight dipole. My OCF dipole is above the house and goes out back and makes a 90 degree turn. Also have a 5BTV with ground radials. Both antennas work ok, but not great, they get me on the air. Came across the KK5JY.net web page about the LOG. Being in a very dense area of the city I get all kinds of noise on both the horiz and vert antenna's. Decided to try Matt's LOG antenna, figured what do I have to loose. Hooked it up to my 7610 as a RX antenna and gave it try. That's what we ham's do right! Is it an end all RX antenna, NO, but does it pull in the signals at a lower SNR sometimes so I can copy them. On the RX LOG the signal might be S3 and on the OCF dipole the same signal will be 10 over 9. Both are 59 copy, only the LOG is a lot easier to listen to with a much lower SNR.

    While on the 7610 I will often time just mute which ever RX is not working good and/or noisy. I simply view this LOG antenna as just another tool that gets the job done once in a while.
     
  7. W4HM

    W4HM XML Subscriber QRZ Page

    I've never considered using a LOP for a receive antenna. But I have experimented with 600 foot long BOG's.

    I found one to hear pretty darned good in the desert north of Las Vegas. In reality with the poor ground conductivity the electrical height was maybe 20 feet above ground, a total guess?

    I ran the same receive antenna in the upper Texas coast but well inland. The ground conductivity was high there so the BOG didn't work at all.

    Normally I keep my beverage antennas approximately 10 feet above ground.
     
    W1YW likes this.
  8. WB6RLC

    WB6RLC XML Subscriber QRZ Page

    Well, here's my 2c worth on the LoG antenna.
    Like all antennas, it is a compromise. It is not perfect in all situations.
    It's advantage is low noise. OK, it takes everything down to S-Zero. But, most times, a signal buried in to noise will work it's way to the top and be readable where it was not before.

    I use a 60ft loop on desert sand. During the last SSB contest I worked 13 countries on 15 meters using the LoG as a Rx antenna.

    On 75M, I can have an S-9 noise sometimes. The LoG works great on 75M as well.
    Does it work great on all bands for all stations. No. But good enough, often enough for me to leave it in place and use it as needed.

    Give one a try. Crud, it only takes 60ft of wire. If you don't like it, pull it up.

    Here is the one I designed mine after.
    http://www.kk5jy.net/LoG/

    Glenn WB6RLC
     
    G0OIL, N6VL and KK9W like this.
  9. KK5LX

    KK5LX Premium Subscriber QRZ Page

    I have had a 60 foot diamond shaped loop on the ground deployed in my front yard for a little over a year. At first it did not work very well, until I wound a beverage antenna transformer and put it at the feed point. Now it works very well on all bands 40-160.
     
  10. AB8MW

    AB8MW Ham Member QRZ Page

    I have 120' deployed and can pick out signals on 80M that would be buried in the QRN hash. There is a 2:5 transformer required at the feedpoint. 73
     

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