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NMO & coax were replaced 4 months ago. The car was recalled for replacement of a side airbag sensor, and the dealer damaged the coax. I replaced it myself. The SWR is perfect with both antennas using this mount/coax. I thought about the mount/coax might be it, but the 5/8 wave is just fine using any power level.

I did try a different radio and the results were the same. I also removed all the USB cables and the power cable for the laptop. Even without any type of cable plugged-in to the laptop, the results were the same. Weird.

I did talk to a radio tech friend who works for the local cop's radio shop. He said that the 1/4's radiation is much closer to the horizon than the 5/8 wave and that could be the cause - he saw this problem before: Key the mike and the patrol car's MDT unit would cycle off/on. Problem was tracked down to the power/control cable for the lightbar/siren. RF was following cable into the car interior. Chokes did not work. Only fix was to use a high gain antenna versus the 1/4 wave.

I'm hoping there is another solution than his answer.

ADDED: Tomorrow I plan to put a temp radio w/magnetic antenna in my wife's car, place the laptop in it and see if it duplicates the problem. I have a buddy that might slide by with his laptop so I can test it in my car.

<blockquote data-quote="qslmark" data-source="post: 404260" data-attributes="member: 22891">NMO &amp; coax were replaced 4 months ago. The car was recalled for replacement of a side airbag sensor, and the dealer damaged the coax. I replaced it myself. The SWR is perfect with both antennas using this mount/coax. I thought about the mount/coax might be it, but the 5/8 wave is just fine using any power level.I did try a different radio and the results were the same. I also removed all the USB cables and the power cable for the laptop. Even without any type of cable plugged-in to the laptop, the results were the same. Weird.I did talk to a radio tech friend who works for the local cop&#039;s radio shop. He said that the 1/4&#039;s radiation is much closer to the horizon than the 5/8 wave and that could be the cause - he saw this problem before: Key the mike and the patrol car&#039;s MDT unit would cycle off/on. Problem was tracked down to the power/control cable for the lightbar/siren. RF was following cable into the car interior. Chokes did not work. Only fix was to use a high gain antenna versus the 1/4 wave.I&#039;m hoping there is another solution than his answer.ADDED: Tomorrow I plan to put a temp radio w/magnetic antenna in my wife&#039;s car, place the laptop in it and see if it duplicates the problem. I have a buddy that might slide by with his laptop so I can test it in my car.</blockquote>

[QUOTE="qslmark, post: 404260, member: 22891"] NMO & coax were replaced 4 months ago. The car was recalled for replacement of a side airbag sensor, and the dealer damaged the coax. I replaced it myself. The SWR is perfect with both antennas using this mount/coax. I thought about the mount/coax might be it, but the 5/8 wave is just fine using any power level. I did try a different radio and the results were the same. I also removed all the USB cables and the power cable for the laptop. Even without any type of cable plugged-in to the laptop, the results were the same. Weird. I did talk to a radio tech friend who works for the local cop's radio shop. He said that the 1/4's radiation is much closer to the horizon than the 5/8 wave and that could be the cause - he saw this problem before: Key the mike and the patrol car's MDT unit would cycle off/on. Problem was tracked down to the power/control cable for the lightbar/siren. RF was following cable into the car interior. Chokes did not work. Only fix was to use a high gain antenna versus the 1/4 wave. I'm hoping there is another solution than his answer. ADDED: Tomorrow I plan to put a temp radio w/magnetic antenna in my wife's car, place the laptop in it and see if it duplicates the problem. I have a buddy that might slide by with his laptop so I can test it in my car. [/QUOTE]

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