| Author |
Message |
    
Cerberus
New member
Username: Cerberus
Post Number: 9
Registered: 6-2009
| | Posted on Saturday, February 20, 2016 - 9:54 pm: | 
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Hello all, I have a question on setting the swr with an amp,I was told by an old timer that I should set the swr with the amp on, I was under the impression that the swr was set between the radio and antenna to get the best match possible. So I checked my swr behind the amp with it off an then with it on, here is the results. With amp off (1)=1.1 (20)=1.2 and (40)= 1.1 now with amp on (1)=2 (20)=1.7 and (40)=1.7 radio is a cobra 148 gtl Chinese model an amp is a Texas Star 350HDV antenna is a Wilson 5000 mag mount.with a 3ft jumper from radio to amp. Can someone give some insight on this. |
Confederate_k5
New member
Username: Confederate_k5
Post Number: 6
Registered: 4-2009
| | Posted on Sunday, February 21, 2016 - 8:37 am: |
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Push in the green "dial a watt" button, make sure the variable knob is turned fully to the right and check SWR again. If still high, have the dead key of the radio turned down and repeat test.
Traveler
South Carolina
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Dale
Senior Member
Username: Dale
Post Number: 2268
Registered: 12-2002
| | Posted on Sunday, February 21, 2016 - 10:07 am: |
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when you do it that way dont forger to re-calibrate ya meter. second swr should not change very much [if any] adding power.now why ya saw a change that could get really techanical. my best guess would be harmonics from amp. but thats my guess. i just use a mfj-259b antenna anylizer. no amp or radio
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
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Cerberus
Junior Member
Username: Cerberus
Post Number: 10
Registered: 6-2009
| | Posted on Monday, February 29, 2016 - 3:10 pm: |
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Hello all,Managed to get the swr's rechecked this weekend, and I made a change in my antenna placement on my vehicle, and went and purchased another 3 ft jumper,so here is the new results using two 3 ft jumpers.
Radio to ant.
(1)=1.1
(20)=1.1
(40)=1.1
Radio to amp with amp off.
(1)=1.2
(20)=1.1
(40)=1.3
Radio to amp with amp on
(1)=1.5
(20)=1.5
(40)=1.5
Amp to ant amp off
(1)=1.2
(20)=1.1
(40)=1.2
Amp to ant amp on
(1)=1.6
(20)=1.5
(40)=1,5 |
Confederate_k5
New member
Username: Confederate_k5
Post Number: 7
Registered: 4-2009
| | Posted on Wednesday, March 02, 2016 - 4:07 am: |
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Does the SWR swing backward with modulation or forward with modulation?
All 7 of my Texas Star amps will swing backward on a Bird RMS Watt meter & SWR Meter on the High Setting.
I usually keep the green button pressed in and hit it with 1.5 Watt dead key and they all swing forward on the Bird and SWR meter.
This is just my experience with my amps.
But With Forward RMS Watts, you're really Better Off !
Traveler
South Carolina
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Tech237
Moderator
Username: Tech237
Post Number: 1858
Registered: 4-2004
| | Posted on Friday, April 15, 2016 - 11:57 am: |
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Looking at those figures, I'd state that you have nothing to worry about.
Tech237
N7AUS
God made me an athiest, who are you to question his wisdom?
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