| Author |
Message |
    
Goat373
Member
Username: Goat373
Post Number: 88
Registered: 3-2005
| | Posted on Sunday, December 04, 2005 - 8:57 pm: | 
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im having a problem....on my ft-100d if i have both my 2 meter and my hf antenna hooked up my swr spikes on key up then levels back out, but with the 2 meter unhooked it has no spike
im thinking its a ground problem on the 2 meter setup and its coming in on the ants sheild, but im not sure, what do you think |
Tech291
Moderator
Username: Tech291
Post Number: 314
Registered: 11-2004
| | Posted on Sunday, December 04, 2005 - 10:31 pm: |
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Goat373,
try a counterpoise ground on the radio.an msn search will provide good info on the subject.
tech291
cef#291
kc8zpj
|
Goat373
Member
Username: Goat373
Post Number: 89
Registered: 3-2005
| | Posted on Monday, December 05, 2005 - 8:18 pm: |
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counterpoise ground did not work...what now....lol...
BTW
with 2 meter center conductor only, its fine, screw the sheild on, high swr problem on SSB/AM peaks
both my antenna share the same grounding network, is this bad?...i didnt think so but nonw im not so sure |
Bruce
Senior Member
Username: Bruce
Post Number: 3289
Registered: 9-2003
| | Posted on Monday, December 05, 2005 - 10:56 pm: |
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Goat if they work one at a time sounds like a strange rf coupling problem i know on 440 the 6 meter antenna causes problems ... |
Goat373
Member
Username: Goat373
Post Number: 92
Registered: 3-2005
| | Posted on Tuesday, December 06, 2005 - 6:21 pm: |
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im going to build a de-coupling transformer and throw that inline...see what happens |
Tech291
Moderator
Username: Tech291
Post Number: 315
Registered: 11-2004
| | Posted on Tuesday, December 06, 2005 - 6:54 pm: |
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I was gonna suggest that last night Goat but got sidetracked(fell asleep at the keyboard).keep in mind the decoupling transformer will not be effective on all frequencies in the hf band.
tech291
cef#291
kc8zpj
|
Goat373
Member
Username: Goat373
Post Number: 94
Registered: 3-2005
| | Posted on Tuesday, December 06, 2005 - 8:04 pm: |
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true that
mfj makes what they call an "RF Isolator"...i may try and duplicate it |
Bruce
Senior Member
Username: Bruce
Post Number: 3291
Registered: 9-2003
| | Posted on Tuesday, December 06, 2005 - 9:56 pm: |
|
Do a GOOGLE search for
(MFJ-915 RF Isolator)
It covers from 1.8 ~ 30MHz |
Goat373
Member
Username: Goat373
Post Number: 95
Registered: 3-2005
| | Posted on Tuesday, December 06, 2005 - 10:13 pm: |
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i think i may try some antenna re=positioning and go from there...also found a nice looking decoupler at a ham site, very nice red color would look nice in my shack |
