Midland Syn-Tech 70-342XL Service Manual page 11

E/PROM PROGRAMMING
7 0 - 3 4 2 ~ ~ / 4 4 2 ~ ~
The 70-342XL and 70-442XL transceivers contain an Erasable/Program-
mable Read Only Memory (E/PROM) module. The module holds specific
customer frequencies, feature selections, and other parameters that
determine radio operation.
Before final alignment and check, the module must be reprogrammed with
customer specifics. If any option add-on kits are to be installed,
appropriate parameters may also need to be programmed a s instructed in
respective kit installation literature.
T o change ElPROM electronic information, the plug-in module must first
be erased by exposing it to ultraviolet light using the MIDLAND 70-
1100/1101 ElPROM Eraser. Then, reprogramming i s necessary using the
MIDLAND 70-1000 ElPROM Programmer. Operation parameter information i s
entered into the Programmer through its keypad, converted into binary
data useful to the transceiver, then written into the E/PROM.
The following are programmable operation parameters in the SYN-TECH
mobile transceivers. See the 70-1000 E/PROM Programmer Operator's
Manual (No. 70-999113) for details.
1.
All eighty transmit and eighty receive channel frequencies
2.
All standard CTCSS tones for each TX and RX channel (requires
installation of the CTCSS module within the transceiver)
3. Time-out-timer time (maximum continuous transmission
duration)
4.
Scan parameters a s follows:
a. Two scan groups, each containing up to sixty-four
channels
b.
A
variety of priority/scan channel revert arrangements
utilizing the two channel lists.
c. Either presence or absence of carrier or correct CTCSS
tone to indicate a busy channel
d. Channel sampling rate (time spent looking for carrier
presence on each channel)
e. CTCSS decode time (time allotted for decoding after
carrier i s detected)
f. Scan hold time (delay of scan resume after channel
clears)
g. Post-transmit scan hold time (delay of scan resume
after PTT release)
h. Retention of scan list channels deleted (skipped) by
operator activation of the DOWN selector while i n scan
mode. Normally, these selections are erased by release
of the SCAN and PRI push buttons and power-down. Pro-
gramming limits erasure to power-down only.
5. Busy channel lockout with or without alert tone to the
operator. Adding jumpers allows busy channel inhibit by
CTCSS tone status. See "BCLO JUMPERING".
6.
Transmit-to-receive changeover delay of up to 200ms for
special options.
7. Last selected channel recall on power-up may be disabled.