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852
Advanced Member
Username: 852
Post Number: 545
Registered: 3-2006
| | Posted on Friday, August 27, 2010 - 9:34 pm: | 
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Wilson 2000 on a mirror mount installed on a T800 Kenworth Dump truck, what length coax should be run? And would any other lengths work and what would be the effects?
Thanks
Tommy~852~CEF 750
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Flying_cloud
Member
Username: Flying_cloud
Post Number: 96
Registered: 4-2009
| | Posted on Saturday, August 28, 2010 - 9:15 pm: |
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852 from what I have read and been told length of coax does not matter just use what is needed for the run. I have used 50' and 5' and still have had SWR readings of 1.1
Flying High and Flying Proud!!!!!!!!
CEF# 1028
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Tech237
Moderator
Username: Tech237
Post Number: 1364
Registered: 4-2004
| | Posted on Monday, August 30, 2010 - 7:15 am: |
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Flying Cloud -= Do YOU?? The meter may read 1:1 at the radio, but is it really that?? Try measuring right at the base of the antenna, and the odds are you'll see a different reading.
FACT: you cannot get an accurate reading at the radio unless you have an electrical half wavelength of cable between the radio and antenna - that includes the length of the meters pick up loop.
852 - having said that use at least 18ft of cable - why do you think most pre-made cables/bases come in that length??
Tech237
N7AUS
God only made some many perfect head, on the rest he put hair.
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852
Advanced Member
Username: 852
Post Number: 546
Registered: 3-2006
| | Posted on Monday, August 30, 2010 - 8:20 pm: |
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Thats what i have always heard also Simon,I was just wondering what to do with all that extra coax, or would it be ok to run a shorter length..
Also when checking the SWR, should i check it at the radio, or the base of the antenna??
Tommy~852~CEF 750
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Tech237
Moderator
Username: Tech237
Post Number: 1365
Registered: 4-2004
| | Posted on Saturday, September 04, 2010 - 7:15 am: |
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At the base of the antenna is the most accurate place to measure UNLESS you are using that electrical half wave length of coax.
Tech237
N7AUS
God only made some many perfect head, on the rest he put hair.
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Flying_cloud
Member
Username: Flying_cloud
Post Number: 97
Registered: 4-2009
| | Posted on Sunday, September 05, 2010 - 9:01 pm: |
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Simon i have never had a problem with my swr i have checked at the antenna and at the radio. i am not a tech but could you let me know why length of coax should affect swr?? i am always willing to learn.
Flying High and Flying Proud!!!!!!!!
CEF# 1028
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Tech237
Moderator
Username: Tech237
Post Number: 1368
Registered: 4-2004
| | Posted on Thursday, September 30, 2010 - 7:25 am: |
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FLying Cloud - so for the slow response to your question, in the process of moving of everything is a mess right now.
The short answer is to read the article in Subscriber Preview -Articles - Coax Cable Facts and Fantasies, which explains all about it.
Tech237
N7AUS
God only made some many perfect head, on the rest he put hair.
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