Simple Dipole Antenna For PMR446
PLEASE NOTE: FOR INFORMATION ONLY - MODIFICATIONS ARE MADE ENTIRELY AT YOUR OWN RISK
DELBOY ENTERPRISES DOES NOT RECOMMEND OR ENCOURAGE THE MODIFICATION OF PMR446 RADIOS
The 160mm dipole elements can be made from metal rods or just stiff wire (If supported on a wood, plastic or stiff cardboard frame).
They are connected to the coax cable using a "Choc-Block" connector. Which can be screwed or glued to a backing wood or plastic panel. Please take care to connect the inner of the coax to the top section and the coax outer braid to the bottom section of the antenna. The coax can be secured to the backing wood/plastic with clips or tape.
This antenna can be made in a matter of minutes and can be located in your loft (As high as possible) or outside if you make it waterproof with tape or by sealing the "Choc-Block" connected in a small plastic box.
Connection To The Radio
(Information supplied by Wayne)
Hi, My name is Wayne and I recently had the misfortune of having the transmit fail on my PMR446 radio. Unfortunately the radio was out of guarantee so rather than simply chuck it in the bin I decided to make a home base receiver out of it.
|After making a simple dipole antenna (Shown above) and
placing it in my loft at the highest possible point I removed the internal
antenna from the radio and connected the coax cable directly to my receive
only radio to see how it would perform.
|Connection to the board was simple. The coax middle was
soldered to the antenna connection at the top of the board and the outer
coax braid was earthed to the negative battery point near the bottom of
the board. This earth wire should be as short as possible.
Alternatively, if you don't wish to solder this in place you can connect the earth to the negative side of the battery terminal by simply wedging the cable behind the end of the battery. Of course a soldered connection is better.
Since completing this modification I have been astounded by the number of stations I can hear on the band. Sometimes ALL 8 channels are in use here in North London. I am now in production of a better dipole antenna which I intend to put outside on my TV aerial pole. I would expect this new antenna to outperform my indoor antenna by a considerable margin.
Of course you must note that this is for RECEIVE ONLY and I would not recommend that you transmit using this arrangement.
Regards, Wayne (26YZ007)
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