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MODIFICATIONS 1

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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

TELCOM TW1000 

The following was sent to me by Peter (2P3TE) via E-Mail on 16th October 2000:

The Telcom TW1000 are great little radios but they have two main problems:

1.    The squelch is set too high on most units.

2.    The modulation is set far too low on most units.

Both problems are easily solved by adjusting the internal pots marked on the pictures below.

The squelch adjustment is made by rotating the pot until the background noise is heard then turning it back just enough to silence the speaker.

The modulation can be adjusted by listening on a second unit whilst counting to ten and gradually turning the pot until the best position is reached. On most units you will need to turn it to the highest level for the best output but be sure to get a radio report from another user to make certain that you do not over deviate which can sound worse than having a quiet audio.

If these modifications are made with care the PMR446 specification should remain intact and you will remain on the right side of the law !

Modifications to the antenna, such as replacing the standard antenna with a quarter wave vertical (16cm) can easily be made but would render the unit illegal and is not to be recommended.

Telcom 100 Modulation and Squelch Adjustment

Information supplied by John

Remove belt clip by pulling on catch and sliding whole clip up towards top of the radio.

Take out the middle battery.

Remove screw at bottom of battery compartment

Using small flat screwdriver insert into small slot on right of radio and open case taking care not to snap connecting wire with battery compartment.

Put the middle battery back in and switch radio on whilst you make adjustments.

See photo for location of squelch and modulation pots.

Top is the squelch, clockwise to reduce level

Bottom is the modulation, clockwise to reduce level.

Re-assemble radios!

Fitting a BNC to the Telcom 100

The task in hand was moderately easy. I used  a flat screwdriver blade from a swiss army knife to open the radio after removing the retaining screw (under the battery compartment). 

The 500ma fuse was removed and power rejoined. This was in order to make room for a round screw in type BNC connector. The antenna was also removed and a careful touch with a soldering iron brought the coil antenna away from the PCB. I next used a small rat tail file to open the existing hole just enough for the BNC to fit. I only had to file the metallic blue side of the radio to achieve a good snug fit. Take care not to get carried away! 

Once I was confident i had a snug fit, I popped a little super glue around the edges just to give it a little more support. I let the glue dry for an hour before i went any further.

Next came the soldering.I then connected the centre of the BNC socket to the area of the PCB from which i had previously removed the original antenna using the finest quality wire I had (coated) - The thinner the better! 

All that remained was to connect the earth point of the BNC to a negative ground on the battery terminal. Carefully close the two compartments together and replace the screw.
Basically that was it!

Mr M New Whitt !

Telcom TE200 Squelch Modification

Information supplied by Peter (2P3TE)

Dead Easy This One:

Adjust the pot to suit !

(Turn Clockwise to LOWER)

One thing to note: The antenna has a little spring inside. Be careful not to lose it or you'll be sorry !

Binatone 100/Goodmans Tracker Mk1

Details E-Mailed to me on 30/05/01

BNC connector fitted in place of rubber antenna

Sick of charging batteries, then build yourself an adapter so you can use your pmr from the mains.

Parts list 2 dummy batteries, 1 x 2.5 or 3.5 power socket, 1 length of 2 core wire.

First pull out the metal strip from the dummy batteries; solder the wire with the white stripe to the positive end of 1 dummy battery and the plain wire to the other dummy battery negative side. Then solder the wire with the white stripe to the center of the power socket the plain to the outer.

Place the dummy batteries in the radio as shown. You should then use a regulated power supply of 4.5 volts dc with the same sized plug as the power socket.

This information is used at your own risk I accept no responsibility for any damage caused

Many Thanks to the MYSTERY MODIFIER ! - - - Delboy

Alinco DJ446 Power Adjustment

(Via E-Mail)

How to modify the UK Alinco DJ-446 446MHz PMR power output from 500mw to 5 Watts. 

Remove the antenna/MIC/Sp cover rubber and mail dial. No tool is required but just carefully pull them out. With slightly enlarging the bottom of the front plastic case toward outside by hand, take the metal main chassis out of the case. No screw is used. Be careful; the chassis and the case is connected with a speaker cable harness. There is a small connector at the left side of LCD. Remove it before you completely separate the unit. 
On the main unit circuit board, just below the antenna there is a screw and there is another one just about 2cm below. Between the screw and a black square component, there is a blank terminal without any component soldered. Solder this terminal (close circuit). Reassemble the unit. No CPU reset is necessary. 

Inductive Coupling

For information about simple inductive coupling CLICK HERE

*********  ALL MODIFICATIONS ARE MADE AT YOUR OWN RISK ********* 

DELBOY ENTERPRISES ACCEPTS NO RESPONSIBILITY FOR THE VALIDITY OF THE ABOVE INFORMATION

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