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Author Topic: 99 nissan frontier 2m interference  (Read 1848 times)
AA4VT
Member

Posts: 5




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« on: December 31, 2007, 02:01:07 PM »

I have intgeference on 146.625 and a couple of other freqs.  It appears to be coming from one of the processors, as it normally appears after 5 mins of driving.  if I shut off the vehicle it lasts for a couple of seconds gthen disssappears.  Called NISSAN and did not get a satisfactory ansswer. I have tried moving power and antenna leads.
Has anyone else had this problem??
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W5RKL
Member

Posts: 893




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« Reply #1 on: December 31, 2007, 05:18:07 PM »

Improper or poor grounds at the radio, the antenna, or
both can contribute to noise.

I recommend reviewing the vehicles owners manual as
there is usually a section devoted to 2 way radio
installation. If that doesn't help, contact Nissan
for further instructions/details. The dealer will
more than likely not be of any help. Dealers are
in the business of selling car/trucks/SUVs, not
much with 2 way radio problems. In addition, review
the radio and antenna manuals to ensure there isn't
anything you might have missed during the radio
and antenna installation.

Happy Holidays and 73's
Mike
W5RKL


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W3LK
Member

Posts: 5639




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« Reply #2 on: January 01, 2008, 12:40:38 PM »

I agree you probably have a ground or ground loop problem.

What kind of radio?
How do you have it connected for power?
How is the radio mounted and where?
What kind of antenna?
How is it installed and where?

A little more information is needed before anyone can make any substantive suggestions.

73,

Lon - W3LK
Naugatuck, Connecticut
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AA4VT
Member

Posts: 5




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« Reply #3 on: January 02, 2008, 07:01:05 PM »

radio kenwood tm 261A
Mounted under dash left of drivers seat(steering wheel)
Power and ground are obtained from the battery

additional ground from frame direct to radio has been tried, same results connected or not
Antenna MFj glass mound 2M whip, however have also tried a mag mount 2m whip on roof same results
I have tried rerouting the power cables , and antenna cable with no difference in noise.
using a scanner the interference appears strongest from under the dash below the radio(am/fm) console.


thanks for everyones help
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W3LK
Member

Posts: 5639




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« Reply #4 on: January 03, 2008, 08:03:37 AM »

<< Antenna MFj glass mound 2M whip, however have also tried a mag mount 2m whip on roof same results >>

Both of these are very poor choices and both will pick up RFI and CAUSE RFI because there is no actual ground side of the antenna. Both are using the feed line as the counterpoise.

Does the problem go away when you disconnect the antenna?

73,

Lon - W3LK
Naugatuck, Connecticut
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AA4VT
Member

Posts: 5




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« Reply #5 on: January 11, 2008, 08:08:25 PM »

It goes away when the antenna is disconnected. It is definetly a internal source as it appears after 10-15 mins after inital startup., but then is there on subsequent starts (more or less) during the day.
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