help on mobile setup - MobileHam Forum at eHam.net

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help on mobile setup	Reply
by N7ORS on July 21, 2001	Mail this to a friend!
I have installed a ten tec scout in a Ford f-150. Antenna is a hamstick on a mag-mount. mag-mount is grounded to floorboard. Rig is grounded to tuner and tuner is grounded to floorboard. power is drawn directly from battery. No problems in rx that the nb can't handle but in TX BIG Problems...both with and without the engine running there is a pulsing noise on tx and sometimes a loud screaching noise. I know the rigs OK, could all this noise on tx be explained by a bad ground or am I looking at other problems?

RE: help on mobile setup	Reply
by N7ORS on July 22, 2001	Mail this to a friend!
update. problem can best be described as an intermittent "flutter"....only happens on 17 meters. I am told the scout is notorious for this. Does anyone know of a fix?

RE: help on mobile setup	Reply
by M0BOV on July 26, 2001	Mail this to a friend!
Loose the mag mount, in my view and experiance they are hopless on HF and should only be used on 144Mhz and above. Use a good mount with braid running to the body work. Use heavy braid going from the radio to bodywork and tuner to bodywork. Any external speakers??? Take them off. Also, pop on RFI rings onto the mic cable near the radio use as many as you need to rid yourself of the RF feedback.

RE: help on mobile setup	Reply
by N8LXR on August 6, 2001	Mail this to a friend!
Ditto here regardign the magmounts, which capacitively couple the grounded side of the antenna to the vehicle. In my expereince, the best way to go with any HF mobile antenna is to ground the antenna with a good solid copper strap running to a solid connection to the vehcile's frame. The length of the strap should not me more than six inches or so. Also, poke around with a volt-ohm meter to make sure that the part you are grounding the antenna to is makeing good electrical contact to the frame of the vehicle. In some of the newer vehicles, there is something left to be deisred in the way of electrical bonding between various parts of the vehicle and installing ground straps between vehicle parts may be necessary. Also, make sure that the radio is also grounded to the as it relates to the car frame with a short piece of grounding strap.

RE: help on mobile setup	Reply
by NI9X on September 20, 2001	Mail this to a friend!
Hey OM, There are many of us HF magmount users out here that are very sucessful at using them on our autos. You just want to make work for the poor fellow. Ni9x

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