The Motorola Syntrx has a well-earned reputation as a rugged and reliable radio. In fact, the term "bulletproof" is often used to describe them. Their popularity evolves from this ruggedness.
THE ‘SKYLINE’ SYNTRX EPROM ADAPTOR
Unfortunately, the Syntrx employs bipolar (fusible link) PROM's to store program information, and these are one-time-programmable devices. That means a new device each time the radio requires reprogramming. These PROM's are long obsolete and supplies are very hard to find - and expensive when you can find them.
The idea of
using adaptors employing EPROM's isn't new, and it isn't
rocket science either. But it does require a fiddly printed
board. Years ago, SkyLine's founder developed such an adaptor for
use in his clients' fleets. The design has evolved
steadily, and due to repeated
requests this adaptor is now being made available
to end users.
Right-click to enlarge images
The pins on the
adaptor will insert directly into the PROM socket in the Syntrx
although they are thicker than IC pins, and that is how they are
For the purists requiring a more elegant job, we recommend removal of
socket and installation of two socket strips (ex Altronics
This work needs to be carefully executed as the plated through holes
to be completely cleared, and the tracks on the radio's double-sided
PCB can be damaged if care is not taken.
There are EPROM
adaptors on the market which have additional components and require
connection to a +5V point on the radio PCB. The simpler SkyLine
design has now been in use for over ten years without issues.
Note that this board cannot be fitted if
the large "L"-shaped selcall board is installed.
This latest layout revision will fit with
either the standard 5ppm reference oscillator or the optional 2ppm
are suitable for both wideband and narrowband operation.
Normally, proprietary Motorola software is required to program the PROMs and create the file for an EPROM. Apparently there is also third party software to generate (E)PROM image files. Do NOT ask us for software as we cannot supply it. Where adaptors are ordered with EPROMs fitted, we can arrange programming to user requirements.
for further information and quantity supply.
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