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Can you cut an antenna?


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Hi Folks,

I have a GME 4705 and it is just that bit too high for my garage. I was wondering if I could trim a bit off the top and reduce the height. BUT if I do this I'm afraid it will detune it and make it pretty crap (not that it is overly good anyway). Otherwise I need a really heavy duty antenna that is between 4.5 and 6db and 700-1000mm high. Need to be used for a mix of flat and hilly driving (mostly hills).

Cheers,

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All UHF antennas are tuned to length, if you cut them, you'll make them really poor performers. I have the 4705 and find it very good, are you sure you don't have an issue with the cabling or radio? Why don't you get a small rubber ducky UHF antenna for around town and use the longer one for the bush, that's what I do.

Cheers

Ray

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What type of antenna do you have.

Is it a fibre glass type whip

Is it a metal rod, as the metal ones are usually a bit shorter.

Rays correct in his comment regarding the tune to length.

Effectivly a antenna is a pice of wire that is cut to the required frequency - i have made antennas out of fencing wire in the past.

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mk tank - It is a GME 4705.

I also have a small whip (think its like 1.5db and about 150mm tall including base). Connections for the 4705 and the GME radio are standard and unchanged. It just doesn't work as well as the Uniden with the 1.5db whip for closer proximity chat.

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I got the 4075 too and it stays off unless I intend to use it, as I cant park it in my garage and shopping centres are a no no too...

as it is, my 'troll only just, and I mean just, clears the roller door(few mm)...

the 4075 is the shortest mast that fits into that base as I've already looked into it...

you can get a base attachment that can be allow the aerial to preposition backward on an angle, but its too much of a hassle for my liking...

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I had a fibreglass GME one and after a few too many knocks the tip broke off about 60-100mm. The wire is just a flat ribbon in plastic inside the fibreglass tube. I took the rubber cap off the busted bit and simply tucked the little bit of wire sticking out back in trimmed the top and siliconed it back onto the remaining antenna. Had no noticeable issues with reception or tuning length etc, however the actual antenna wire was never shortened physically, just maybe folded back on itself? At the end of the day the antenna was now no higher than the roof, and it never hit anything again whilst still worked good for what I needed. :)

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This is one that I've thought about replacing my fairly old rubber ducky with either this one:

http://www.prestigecom.net.au/index.php?main_page=product_info&cPath=371&products_id=2116

GRN480_highly_flexible.jpg

or this one:

http://www.prestigecom.net.au/index.php?main_page=product_info&cPath=371&products_id=2163.

ZN3-77-04-TP.jpg

as I think both fit the 4705 antenna base.

Cheers

Ray

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the base for the 4705 is AS004 http://www.gme.net.au/products/accessories/accessories-antennas-springs/AS004

the SO239 base has a different attachment system...

I cant find the adjustable mounting block that (cant remember where) the 4b shop showed me, but I didn't like it...

unless the aerial Rays talking about just sits in the base and doesn't thread in then i cant see how it would work???

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the base for the 4705 is AS004 http://www.gme.net.au/products/accessories/accessories-antennas-springs/AS004

the SO239 base has a different attachment system...

I cant find the adjustable mounting block that (cant remember where) the 4b shop showed me, but I didn't like it...

unless the aerial Rays talking about just sits in the base and doesn't thread in then i cant see how it would work???

S0239 refers to the UHF style connector on the spring base. So as I said the 4013 screws on dispite the fact the spring is as004

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This is my day to day antenna, a rubber ducky shielded by an alloy housing a mate of mine had machined up, so that it locks in the same way as the 4705 and can't be pilfered:

antenna.jpg

I just wanted to add that years ago, before I had this made up, I'd contacted GME Electrophone in Melbourne and asked them if it was possible to make a shorter antenna with the same base as the 4705, just so that it could be used around town and not interfere with carparks, garages etc. I was met with a resounding no, there's no point. Excellent Australian innovation, not.

Cheers

Ray

Edited by Ray!
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