Simple Inductive Coupling

(Information received via E-Mail)

FOR INFORMATION ONLY

Delboy Enterprises does not recommend or encourage the modification of PMR446 radios

The above picture shows a simple inductive coupler used to improve reception on the PMR446 band.

All you need is: A short length of coax cable, some coated copper wire, a PL connector (Male or female), solder and a soldering iron.

First prepare your coil by wrapping between 10 and 20 turns around the PMR446 antenna or a plastic tube. Make it a tight fit with just enough slack to remove the coil from the antenna. Leave both ends sticking out at 90 degrees to the coil.

Secondly prepare the coax by cutting back the outer covering to a length of about 5cm and pull back the braid, twisting it into one long strand. Cut this strand to about 15mm. Now strip off a small section of the inner insulator at the top and again twist into a small strand. Bend both strands out at 90 degrees to the coax cable and tin them with solder.

Now scrape off the coating at the ends of the coil and tin with solder.

Attach the coil to the coax. The top of the coil with be attached to the inner strand of coax and the bottom with be attached to the outer strand of braid.

Insulating tape can be placed around the soldered connections if you like.

Now attach the PL connector. If a male connector is used a double female adapter will be required to attach to your antenna cable.

To use: Simply place the coupler over the antenna with the coax facing down along the side of the radio and connect to your antenna.

Ideally your antenna should be tuned for the PMR446 band, should be vertical and should be as high as possible for the best results. Reception is usually 200-300% better than using the PMR on it's own.


Many thanks to my mystery E-Mailer for this information. 


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