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We are proud to offer a new PIC conversion for the Pye/Philips MX series mobiles enabling them to cover the three most popular amateur bands – 2m, 4m and 70cm with core features such as CTCSS tone encoding, 1750Hz toneburst, and scanning.

There is now no requirement to reprogram the PROM, the current frequency is displayed on the existing LCD display as four digits e.g. "4500" for 70.450Mhz. With 2m & 70cm the channels are arranged into banks for easy access, this allows reverse repeater operation with just a push of a button. All UK repeater shifts are programmed into the PIC, plus a selection of European repeater channels including their offsets, along with Internet voice and Emergency duplex channels.

The conversion is fully plug-and-play, requiring no soldering or modifications to the mobile itself, only four components need to be removed from the TEDX board for full operation. If your mobile is already working on an amateur band then it is likely that no additional tuning will be required.

The TEDX module conversion presents an ideal interface to the radio and PIC processor boards. The MX290 series radio now has the original TEDX processor replaced by the PIC plug in module and an additional push fit 8-way connector plugs into the MX290 PROM socket where it supplies all frequency data for the synthesizer.

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Because the software has been specifically written to perform with the TEDX hardware, all the hardware and interfaces to the radio have been utilized making full use of original excellent design. Having no additional hardware effectively preserves the original equipment performance and build quality.

 

Tones for both CTCSS and the 1750Hz toneburst are produced by the TEDX’s own hardware and are fully level adjustable by the original internal pots. The squelch open signal, PTT line and all other interconnections are via the processor socket further adding to the reliability of the conversion. The LCD display is illuminated as standard for night use by internal LEDs, all four buttons are used and are also back-lit by LEDs.

Buttons are included to move between frequency banks – "reverse repeater" via the green button, and channel up / down via the "+" and "----" buttons – as shown in picture above left. Each button press is acknowledged by a short low level beep. The alarm triangle button now has a dual function to switch between Channel mode and CTCSS mode. In CTCSS mode the wanted tone can be selected from the 38 standard tones. To exit CTCSS mode the button is held down until a double beep. Encoding of CTCSS tones and 1750 Hz toneburst is selected by the second red button with a quaver symbol.

Scanning is established by pressing the yellow button – when pressed the TEDX scans for the next busy channel. The scan will stop on a busy channel, wait a short period and then resume scanning. The green indicator is used as a busy indication. Scanning can be stopped at any time by tuning off the yellow LED with a single press or by pressing the PTT.

CTCSS, Frequency and the current bank of channels will be saved at switch off and will return to the previous condition at power up. This is stored in E2PROM, not by internal battery.

 

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ãG8UJS & MRC Ltd 2005 . . . . . . . . . .CONTINUE FOR MORE INFO >