Fender mount Ham radiation concern
11-07-2016, 07:53 AM
#1
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Hey all, I'm about to pull the trigger on a yaesu either 2900 or 7900. Either way I wanted to go with fender mount on the driver side. I've read that has the best propagation(?) but I'm worried about radiation to my cranium. I currently have a teraflex spare tire mount for my CB which comes with 2 holes side by side one which has the CB antenna mounted to it. Supposedly that's not the best place for a HAM antenna? Any advice or words of wisdom? TIA
Last edited by pitbull62; 11-07-2016 at 08:28 AM.
11-07-2016, 02:29 PM
#2
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I would separate it a bit from the CB antenna if it is real close. Get a good antenna and a good mount and you will be fine. Everything on a jeep is a compromise.
I have a rear fender mount HF antenna on my Jeep and I get reception from Europe, Middle East, South America so it can work well.
I have a rear fender mount HF antenna on my Jeep and I get reception from Europe, Middle East, South America so it can work well.
11-08-2016, 10:16 AM
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I would separate it a bit from the CB antenna if it is real close. Get a good antenna and a good mount and you will be fine. Everything on a jeep is a compromise. I have a rear fender mount HF antenna on my Jeep and I get reception from Europe, Middle East, South America so it can work well.
11-08-2016, 09:19 PM
#4
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Hey pitbull,
If you believe the FCC info and regulations, 50 watts or less on 2 meters and 70 watts or less on UHF is not a concern with regard to RF exposure. See page 15 and 16 of this: https://transition.fcc.gov/bureaus/o...et65/oet65.pdf
That being said, I personally prefer the rear mounted antennas to prevent them from being damaged (i.e. shrubs growing along a narrow road). Using a half-wave antenna on your preferred band will provide significant improvements in RX and TX as compared to a 1/4 wave or 5/8's. In my case, I run a dual band antenna mounted just above the spare tire and the 2 meter antenna is 1/2 wave while the UHF part of it is 5/8's. It all works quite well as compared to my other vehicle installations.
Good luck.
If you believe the FCC info and regulations, 50 watts or less on 2 meters and 70 watts or less on UHF is not a concern with regard to RF exposure. See page 15 and 16 of this: https://transition.fcc.gov/bureaus/o...et65/oet65.pdf
That being said, I personally prefer the rear mounted antennas to prevent them from being damaged (i.e. shrubs growing along a narrow road). Using a half-wave antenna on your preferred band will provide significant improvements in RX and TX as compared to a 1/4 wave or 5/8's. In my case, I run a dual band antenna mounted just above the spare tire and the 2 meter antenna is 1/2 wave while the UHF part of it is 5/8's. It all works quite well as compared to my other vehicle installations.
Good luck.
11-08-2016, 09:33 PM
#5
Super Moderator
Eh... it's a matter of exposure too. How long, over time, will you be exposed to transmission. If you're not transmitting, then it's not 'dosing' you. Lots of other stuff you should worry about before that. For example the elastomers in plastics inside your vehicle (that grime that accumulates on the inside of your windshield is the elastomers off-gassing) is something you get way more exposure to. Or the chemicals in the soda you drink, or blah, blah, blah.
11-18-2016, 06:59 AM
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I have the 7900 and I made a 5 antenna mount that is perpendicular to my windshield bracket (so I can bend antennas over the hood and they still work great). The windshield will deflect a lot so you should be fine with your cranium. The hood area remains best for propagation while the rear is worst. Enjoy, it's a great radio for the Jeep!
Last edited by CombatDiver; 11-18-2016 at 07:02 AM.
11-30-2016, 08:16 PM
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Hey pitbull,
If you believe the FCC info and regulations, 50 watts or less on 2 meters and 70 watts or less on UHF is not a concern with regard to RF exposure. See page 15 and 16 of this: https://transition.fcc.gov/bureaus/o...et65/oet65.pdf
That being said, I personally prefer the rear mounted antennas to prevent them from being damaged (i.e. shrubs growing along a narrow road). Using a half-wave antenna on your preferred band will provide significant improvements in RX and TX as compared to a 1/4 wave or 5/8's. In my case, I run a dual band antenna mounted just above the spare tire and the 2 meter antenna is 1/2 wave while the UHF part of it is 5/8's. It all works quite well as compared to my other vehicle installations.
Good luck.
If you believe the FCC info and regulations, 50 watts or less on 2 meters and 70 watts or less on UHF is not a concern with regard to RF exposure. See page 15 and 16 of this: https://transition.fcc.gov/bureaus/o...et65/oet65.pdf
That being said, I personally prefer the rear mounted antennas to prevent them from being damaged (i.e. shrubs growing along a narrow road). Using a half-wave antenna on your preferred band will provide significant improvements in RX and TX as compared to a 1/4 wave or 5/8's. In my case, I run a dual band antenna mounted just above the spare tire and the 2 meter antenna is 1/2 wave while the UHF part of it is 5/8's. It all works quite well as compared to my other vehicle installations.
Good luck.
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11-30-2016, 08:17 PM
#8
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I have the 7900 and I made a 5 antenna mount that is perpendicular to my windshield bracket (so I can bend antennas over the hood and they still work great). The windshield will deflect a lot so you should be fine with your cranium. The hood area remains best for propagation while the rear is worst. Enjoy, it's a great radio for the Jeep!
12-01-2016, 11:44 AM
#9
JK Freak
Also intrigued by that 5 antenna setup...
I'm also running the Yaesu 7900, which is a terrific radio. For antenna I'm running the Comet 2x4sr with the spring base, on a fender mount.
It's very durable, and flexes out of the way of branches very well; and if you're ever in a really tight spot, it folds down easily. Already had it through a few tight trails, and it came out unscathed.
I'm also running the Yaesu 7900, which is a terrific radio. For antenna I'm running the Comet 2x4sr with the spring base, on a fender mount.
It's very durable, and flexes out of the way of branches very well; and if you're ever in a really tight spot, it folds down easily. Already had it through a few tight trails, and it came out unscathed.
12-01-2016, 07:39 PM
#10
JK Enthusiast
Hey Pitbull -
Here are some older pics, from when I originally installed the antenna mounts. Currently I use one dual band ham antenna the other is a scanner antenna. The pics in the link only show one antenna which I no longer use.
FTM-350AR Install
Cheers -
Here are some older pics, from when I originally installed the antenna mounts. Currently I use one dual band ham antenna the other is a scanner antenna. The pics in the link only show one antenna which I no longer use.
FTM-350AR Install
Cheers -