IMAX 2000 CHANGED
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De_Wildfire
- Donor
- Posts: 849
- Joined: June 14th, 2009, 7:46 pm
- Handle: De_Wildfire
- Real Name: Greg
- Antenna: Imax 2000. Hex Beam, G5RV dipole, Jpole(UHF/VHF) Austin Suburban Tri Band (UHF/VHF)
- Radio: Washington, Tram D201, Tram D64, Robyn 520D, Cobra 139XLR, Elecraft K3S, Kenwood 590S, Yaesu FTM 400DR, Alinco DR-235, ADI-146
- Contact:
IMAX 2000 CHANGED
My Imax 2000 has been up there for so long, I can't remember the year when it went up, maybe 2006. Within the last two weeks, SWR has changed from 1.1 on 27.255 to 1.1 on 28.005 when checked with the analyzer. Something went out of tune somewhere. I am guessing there is a tuning ring adjustment. The LMR 400 coax has been replaced six years ago and it works very well on 10 meters with the exception of a 1.5 swr now on 27.255 and a tuner can compensate and still making great contacts on 11 meters. I am wondering if it's really worth the effort and instead focus on building other home brew antennas on other bands. Any thoughts?
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MDYoungblood
- Site Admin
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- Joined: June 12th, 2010, 8:05 pm
- Handle: MDYoungblood
- Real Name: Gregory
- Antenna: HyGain AV-6160
- Radio: Icom IC-746 (non pro)
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Re: IMAX 2000 CHANGED
I think it could be possibly 2 things, 1, the coax is old and has gotten contaminated over the years or 2, with age the lower section of the antenna has started corroding inside at the impedance matching coil. It actually could be both of these.
3's
Greg
3's
Greg
"321, West Manchester Township, PA"
Official Moderator - CBRT Complaint Department
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De_Wildfire
- Donor
- Posts: 849
- Joined: June 14th, 2009, 7:46 pm
- Handle: De_Wildfire
- Real Name: Greg
- Antenna: Imax 2000. Hex Beam, G5RV dipole, Jpole(UHF/VHF) Austin Suburban Tri Band (UHF/VHF)
- Radio: Washington, Tram D201, Tram D64, Robyn 520D, Cobra 139XLR, Elecraft K3S, Kenwood 590S, Yaesu FTM 400DR, Alinco DR-235, ADI-146
- Contact:
Re: IMAX 2000 CHANGED
Greg, Thanks. Looks like the best thing to do is replace the antenna and the coax (do it right) but maybe wait until it gets worse when the antenna looks even shorter. It works great right now on 10 meters without a tuner. I don't think the 1.5 is putting much stress on the radio on 11 meters but I am watching it very closely. It's now time to save up and get things ready for when it really goes bad.