[LakelandARC] Re: Mobile Antenna Expert needed

[George Mann]

Tom,

Great suggestions. nice to have a good "Elmer" in the group! This is a good
reminder to us ole timers as well.

73 de KJ4UW, Polk City

 

From: LakelandARC at yahoogroups.com [mailto:LakelandARC at yahoogroups.com] On
Behalf Of Tom
Sent: Tuesday, January 24, 2012 7:19 AM
To: LakelandARC at yahoogroups.com
Subject: [LakelandARC] Re: Mobile Antenna Expert needed

 

  

Hi George,

 

While I don't claim to be an antenna expert, I can suggest some things to
check.

 

1) Does the antenna have a good electrical ground at the coax attachment
point?

If you can remove the antenna from its mounting base and disconnect the
radio end of the antenna cable from whatever it is connected to, you can
then measure the electrical resistance between the point where the antenna
mounts to its base and the vehicle chassis with an ohm meter. It should be 0
ohms.

 

2) Have ypu checked both the center conductor and shield of the antenna
cable for 0 ohms resistance, and infinite resistance between the center
conductor and shield?

 

3) Have you checked the antenna to make sure it is resonant at or near the
frequency you are transmitting at using an antenna analyzer?

 

4) Have you verified the radio's output power using an external power meter?

 

Other, more obscure things to check are mic gain and transmit modulation
percentage.

 

I have all of the test equipment necessary to check these things if you need
any of it.

I can also help you perform the tests if you want.

 

Good luck,

Tom

KJ4WFS


--- In LakelandARC at yahoogroups.com, "George" <ki4nbe at ...> wrote:
>
> Hello, I need a Mobile Antenna Expert installer.
> I'm wanting to go HF Mobile, have a Icom IC-706mkllg, Antenna is a
CHAMELEON V2, the mobile is a 2005 Chevy Colorado LS 4x4 Z71.
> I have the antenna installed on the left (Driver side) 1/4 panel with a
hood bracket. I have tried grounding it the best I know how. The tuner shows
it tunes and swr show good. I hear everything there is to be heard but no
one hears me. Can someone help with this?
> Is anyone up for the challenge?
> Please Help, I can come to you anytime.
> 73 George/KI4NBE
>



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