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post #1 of 5 (permalink) Old Apr 23rd, 2011, 11:18 pm Thread Starter
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Location: Orlando, Florida, USA
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2 Meter Radio

Does anyone here have a 2 Meter FM Radio mounted on their bike? If so, what are you using for an antenna? Did you fabricate an artificial ground plane? Any noise issues?
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post #2 of 5 (permalink) Old Apr 24th, 2011, 8:36 am
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As a 'retired' G8 and having spent most of my working life in professional radio & TV comms, this question has come up before. Although these days it seems to be about interference free audio from ipods and entertainment kit!

I think you should think about a high frequency dc-dc switchmode converter psu. You can screen it so any harmonics from the switcher shouldn't be a problem. But you will have galvanic isolation from the bikes power rails and alternator. Efficiency is about 90%. Rf grounding to the bike frame should be avoided but must then be done with isolating caps if using ground plane whips like a 5/8. Metal cases of the TX/RX should NOT be connected to the bikes metalwork. I would look at mounting the antenna on the rear rack, well away from the arcs and sparks of the alternator.

Ground planes are definitely an issue with whips and even on cars I've found getting decent VSWRs difficult, even in the center of the roof. If it was me I'd look at balanced vertical antennas like the co-linear. But as I said, I've been inactive and out of touch for quite some time.

73's - Vox



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post #3 of 5 (permalink) Old Apr 27th, 2011, 10:29 pm Thread Starter
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Thanks Voxmagna,

I've been out of it for a lot of years and looking to get back to it. In Florida when you get of the beaten path (away from the interstates and large metro areas) most cell service is spotty at best. I'm at the point in my life that I don't care how long it takes. So most of my riding is on two lane, in what Florida use to be. Thanks again.
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post #4 of 5 (permalink) Old Apr 29th, 2011, 7:03 pm
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I don't know what it's like your side, but 2M always used to be better for intelligent QSL's compared to CB and PMR if you get my meaning.

I used to work mobile to repeaters and base stations and found the link worked pretty well. Mobile to mobile was never good in the city unless I was static.



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post #5 of 5 (permalink) Old May 1st, 2011, 7:47 pm
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I am currently running Kenwood TH-D72 on my K1200rs.

Antennas either have to have a ground plane (fabricated 1/4 wave stinger on the shied side of the coax) or you simply run a half wave antenna to start with and the ground plane issue is non existent.

I run APRS on 2 meters and do my voice comms thru the local repeater on 440. Wife is also a ham so we use radio a lot.

See my APRS track here.
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