| Author |
Message |
    
Dave P (Unregistered Guest)
Unregistered guest
| | Posted on Sunday, September 19, 2004 - 2:28 pm: | 
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I'm having a problem with high SWR's when I hook up my linear amp to my radio. When I disconnect my linear and use just my radio my SWR's are fine. Any suggestions? |
Bruce
Senior Member
Username: Bruce
Post Number: 1590
Registered: 9-2003
| | Posted on Sunday, September 19, 2004 - 5:36 pm: |
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yes the trash from a linear will show as high swr |
Watt
Junior Member
Username: Watt
Post Number: 28
Registered: 1-2004
| | Posted on Sunday, September 19, 2004 - 5:51 pm: |
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Does that amp have a tuned input? If not then naturally you are going to see a high swr through it. Key words TUNED INPUT. Check with the manufacturer to see. |
Dx431
Advanced Member
Username: Dx431
Post Number: 914
Registered: 2-2002
| | Posted on Sunday, September 19, 2004 - 6:24 pm: |
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What are your swrs with the amp?
What length jumpers are you using?
I would start with the jumpers. Might have a bad pl connector. Or you might try different lengths. Use multiples of 3. 3',6',9'.etc.......... |
Patzerozero
Intermediate Member
Username: Patzerozero
Post Number: 110
Registered: 7-2004
| | Posted on Sunday, September 19, 2004 - 6:24 pm: |
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need more details-base or mobile, amp-radio-meter-antenna, more importantly, if hooked up correctly, what are swr's with radio only inline, amp inline and OFF, amp inline and on, etc |
Patzerozero
Intermediate Member
Username: Patzerozero
Post Number: 114
Registered: 7-2004
| | Posted on Sunday, September 19, 2004 - 10:16 pm: |
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i think dave must've jumped.......... |
Dave P (Unregistered Guest)
Unregistered guest
| | Posted on Monday, September 20, 2004 - 9:56 am: |
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I have a DX93T Galaxy mobile radio with Wilson 5000 antennas.My SWR's with just the radio inline are 1.5. With the linear the radio's high SWR alert comes on and I get a steady 3. |
Patzerozero
Intermediate Member
Username: Patzerozero
Post Number: 115
Registered: 7-2004
| | Posted on Monday, September 20, 2004 - 1:06 pm: |
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swr's of 3:1 usually indicates a ground problem.
what amp are you using w/93T? 1-2290 trans is a lot of input unless everything is set up right. if the radio works fine with amp PHYSICALLY REMOVED circuit , but replacing it into circuit brings swr's to 3:1, then i'd guess the jumper between radio and amp is no good. are you using separate swr meter BETWEEN amp and antenna,(i don't know if 93t has built in swr meter-if it does, don't use it)
put a shooting star 225 amp in a car once w/ss3900, amp wasn't right because it made swr go up and showed 50% reflected power on yaesu wattmeter, put texas star modulator back inline and everything was fine. returned shooting star and got another, and everything was fine. |
Dx431
Advanced Member
Username: Dx431
Post Number: 918
Registered: 2-2002
| | Posted on Monday, September 20, 2004 - 1:25 pm: |
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What vehicle is this in?
I'm assuming these are mirror mounts?
I would start off by checking all pl connectors and grounding everything. Ants, radio, amp, etc. |
Bulldog369
Intermediate Member
Username: Bulldog369
Post Number: 154
Registered: 2-2004
| | Posted on Monday, September 20, 2004 - 2:43 pm: |
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sounds like the patch cord between the radio an the box
i would try a new jumper.... |
Watt
Junior Member
Username: Watt
Post Number: 30
Registered: 1-2004
| | Posted on Monday, September 20, 2004 - 7:48 pm: |
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Does the amp have tuned input? |
Cowboy_bob
New member
Username: Cowboy_bob
Post Number: 4
Registered: 12-2004
| | Posted on Friday, December 03, 2004 - 1:14 pm: |
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If you have a 1.5 SWR with the radio alone, youre pushing your luck. To run a linear safely you should have a 1.3 or better with the linear inline but POWERED OFF. If youre gonna run HEAT with a 1.5...youre gonna blow the linear. If it was a coax or jumper issue, your SWR's would be higher than 1.5, so you probably have an antenna ground issue. If youre using a mirror mount and have mirror heat, the mirrors can be either a neg or a pos ground. Isolate your antenna bracket with rubber sheeting(a piece of a bicycle tire inner tube is perfect) or wrap the mirror bar with duct tape. Put your bracket on that..Run a ¾" braided ground strap from any nut on the antenna bracket and run it down to the frame of the vehicle. Better yet to a nut on the radiator. Worked for me on a Mack "Granite" |
