ATV antenna
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ATV antenna
Hello all
I have a customer who wants a VHF rubber duck type antenna for their VFD ATV. I'm using a Antenna Specialists Part#
HP12 . The radio will be a 45 watt M1225. Anyone have any ideas if this will work ?????
thanks
steve w
I have a customer who wants a VHF rubber duck type antenna for their VFD ATV. I'm using a Antenna Specialists Part#
HP12 . The radio will be a 45 watt M1225. Anyone have any ideas if this will work ?????
thanks
steve w
- Astro Spectra
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Re: ATV antenna
I can't find the antenna you're talking about (can you post a link?) but problems might be the VSWR of the helical is so bad the M1225 may go into shutdown or the VSWR is OK but the top of the helical may catch fire. Don't laugh I've seen it happen with just 25W.
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Re: ATV antenna
Thanks for the info !
The antenna is for portable radios but just checking to see if it might work or not.
steve w
The antenna is for portable radios but just checking to see if it might work or not.
steve w
Re: ATV antenna
You are better off with a good 1/4 wave antenna. Comtelco A1511A.
Do not forget you need a good groundplane for the antenna, 19 inches radius. Even with the ruberduck you need a groundplane for it to work correctly and not feed back into the radio.
Do not forget you need a good groundplane for the antenna, 19 inches radius. Even with the ruberduck you need a groundplane for it to work correctly and not feed back into the radio.
Re: ATV antenna
Because there is nothing between the radio and the antenna except air, you may have to fold power back to less than 10W. Otherwise, you may find the radio does strange things like no xmit audio, distorted PL or DPL, xmit whine, etc. That series was not meant to operate in it's own near field.
- HLA
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Re: ATV antenna
On atv's I use fiberglass marine antennaes just like on a boat. They don't need ground planes and they can put the orange marker flag on top of it
HLA
I never check PM's so don't bother, just email me.
I won't reply to a hotmail, gmail, aol or any other generic free address, if you want me to reply use a real address.
STOP ASKING ME FOR SOFTWARE OR FIRMWARE, I JUST FORWARD ALL OF THE REQUESTS TO THE MODERATORS
I never check PM's so don't bother, just email me.
I won't reply to a hotmail, gmail, aol or any other generic free address, if you want me to reply use a real address.
STOP ASKING ME FOR SOFTWARE OR FIRMWARE, I JUST FORWARD ALL OF THE REQUESTS TO THE MODERATORS
Re: ATV antenna
What HLA said.... They used to make no ground plane fiberglass antennas for motorcycles. The marine antennas would work as well. I'd kick down the RF too. Human body proximity in a ATV is too close for 50 watts!
Q: Does this unit come with a speaker?
A: hello yes its in the radio thanks
A: hello yes its in the radio thanks
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- Posts: 426
- Joined: Sun Apr 24, 2005 12:37 pm
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Re: ATV antenna
I'm thinking about a Shakespeare 36" marine antenna (model # 5240-R) with the rail mount. I believe this might work well.
steve w
steve w
Re: ATV antenna
Stay away from ANY portable antenna for mobile use, especially at the power rating you described.
H.T antennas are not designed for that power level, the RF current melts connecting joints, warps field patterns, and will cause damage due to radiation resistance of the antenna itself.
Portable antennas are designed to carry minimal RF current, and will cause an impedance imbalance due to the physical size(power limiting factor), and also size/form factor to relieve mechanical stresses on the antenna connector on the radio itself.
RF burns for a portable antenna are bad at 5 watts, you can get a deep burn at 45 watts with your configuration, so carry plenty of gauze and ointment!
The HEAT buildup will also be greater due to the mechanical design of the portable antenna, and I will bet you melt the cover in a few short minutes. That RF MUST go somewhere, and if not radiated, it is wasted in heat.
Mount a 24" square or round 'plate' on top or under the roof if you have a canopy, and use wither a 1/4 wave or 3dB gain whip. You can also use the 1/2 wave feeds, and forego the ground plane. Just SCRAP the H.T antenna idea, poor choice!
H.T antennas are not designed for that power level, the RF current melts connecting joints, warps field patterns, and will cause damage due to radiation resistance of the antenna itself.
Portable antennas are designed to carry minimal RF current, and will cause an impedance imbalance due to the physical size(power limiting factor), and also size/form factor to relieve mechanical stresses on the antenna connector on the radio itself.
RF burns for a portable antenna are bad at 5 watts, you can get a deep burn at 45 watts with your configuration, so carry plenty of gauze and ointment!
The HEAT buildup will also be greater due to the mechanical design of the portable antenna, and I will bet you melt the cover in a few short minutes. That RF MUST go somewhere, and if not radiated, it is wasted in heat.
Mount a 24" square or round 'plate' on top or under the roof if you have a canopy, and use wither a 1/4 wave or 3dB gain whip. You can also use the 1/2 wave feeds, and forego the ground plane. Just SCRAP the H.T antenna idea, poor choice!
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- Posts: 426
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Re: ATV antenna
Thanks for info !!!
Looks like a marine antenna is what I am going them.
steve w
Looks like a marine antenna is what I am going them.
steve w
- HLA
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Re: ATV antenna
I usually use the Shakespere 8 footers mostly for height for a marker flag but the height definately helps with coverage too. Plus if i'm not mistaken it's a 3db gain antennae so you can cut power down and still get the same range
HLA
I never check PM's so don't bother, just email me.
I won't reply to a hotmail, gmail, aol or any other generic free address, if you want me to reply use a real address.
STOP ASKING ME FOR SOFTWARE OR FIRMWARE, I JUST FORWARD ALL OF THE REQUESTS TO THE MODERATORS
I never check PM's so don't bother, just email me.
I won't reply to a hotmail, gmail, aol or any other generic free address, if you want me to reply use a real address.
STOP ASKING ME FOR SOFTWARE OR FIRMWARE, I JUST FORWARD ALL OF THE REQUESTS TO THE MODERATORS