| Author |
Message |
    
Freddy_fudpucker
New member
Username: Freddy_fudpucker
Post Number: 1
Registered: 5-2016
| | Posted on Wednesday, May 11, 2016 - 12:49 pm: | 
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I need to know if anyone has tuned their beams on the ground. I read you can do it if you adjust the SWR 20-25 channels below where you plan to run. Does this work? |
Confederate_k5
New member
Username: Confederate_k5
Post Number: 9
Registered: 4-2009
| | Posted on Wednesday, May 11, 2016 - 10:06 pm: |
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What kind of beam is it?
Traveler
South Carolina
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Freddy_fudpucker
New member
Username: Freddy_fudpucker
Post Number: 2
Registered: 5-2016
| | Posted on Thursday, May 12, 2016 - 5:22 am: |
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It is a new gizmochy five element. I read the tuning directions on the Jo Gunn website. Not quite sure what to believe from kjo gunn. |
Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 493
Registered: 10-2002
| | Posted on Thursday, May 12, 2016 - 11:11 am: |
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I tuned my Maco 103c beam about 7 foot off the ground on the flat side. I installed it about 20 foot off the ground when I had finished. My swr stayed about the same. |
Confederate_k5
Junior Member
Username: Confederate_k5
Post Number: 10
Registered: 4-2009
| | Posted on Thursday, May 12, 2016 - 8:15 pm: |
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I tuned my MaCo 5 flat side 9ft off the ground, and a PDL II laying on the ground pointed up and got the desired results...... but I have no Gizmotchy experience contact the company and ask, they'll be glad to help you out.
Joey
Traveler
South Carolina
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Philt
New member
Username: Philt
Post Number: 1
Registered: 2-2016
| | Posted on Friday, May 13, 2016 - 11:38 am: |
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Was wondering if you guys got any ideas about this problem. I have a Maco 3 element that I tuned flat side 8ft off the ground to a 1.1 swr. A year later a storm blew it down so I fixed the bends and tuned it just like before to a 1.1 swr but when I installed it up on the mast the swr's jumped to 1.7 and higher plus the ohm reading jumped from 50 to 65 ohms on my mfj meter. Reflect jumped from1 watt to 20 watts. Did this whole procedure twice with same results. Anybody have suggestions to what is causing this scenario? |
Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 495
Registered: 10-2002
| | Posted on Friday, May 13, 2016 - 11:55 pm: |
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I would think that the antenna is weak where the bends are and that after being up that the gravity and the weight is causing the element's to bend downward causing it to be back out of line with the other element's. Now this is just a guess as I am not an expert and this had not happen to me yet. |
Press_man
Advanced Member
Username: Press_man
Post Number: 925
Registered: 5-2008
| | Posted on Saturday, May 14, 2016 - 4:25 pm: |
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Speaking from a metallurgic background, stressed metal (bent) becomes work hardened (stiffer). Although harder it shouldn't effect the ability to transmit if the bends weren't sharp. One problem that could exist is slight S bends from trying to straighten the elements causing misalignment. Another "hum, could be" is coax or coax/beam connectors damaged.
73 Pressman
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Freddy_fudpucker
New member
Username: Freddy_fudpucker
Post Number: 3
Registered: 5-2016
| | Posted on Sunday, May 15, 2016 - 6:11 am: |
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BTW... I contacted gizmochy. They had no magic formula to tune the SWR. The best they came up with was set it as low as you can before you raise it up. |
Philt
New member
Username: Philt
Post Number: 2
Registered: 2-2016
| | Posted on Monday, May 16, 2016 - 11:55 am: |
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Thank you guys! That is kinda what I was thinking too. I am going to just replace the bent element and go from there and hopefully be back in the ball game.
Nitro in (VA) |
Tech833
Moderator
Username: Tech833
Post Number: 2358
Registered: 8-2002
| | Posted on Tuesday, May 17, 2016 - 12:53 am: |
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Large commercial HF antennas are tuned using a crane (or a bucket truck if not very high AGL).
In case you wondered what commercial stations use... Gamma matched antennas are just too touchy for commercial HF use. That is why almost all commercial HF stations needing a beam type antenna use a log periodic. Not only being stable, they are also frequency agile.
Your radio 'Mythbuster' since 1998
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