7-2 Adjustments 8525B/8528 Technical Service Manual
Issue 6 Publication No: 15-02036
7.2.1 Channel Addition, Programming P Channels (8528)
In 8528 series transceivers, ninety-nine ‘P’ channels can be programmed
from the front panel to suit the user’s requirements. However, to prevent
transmission on frequencies for which the operator is not authorised, option
TxD inhibits the entry of new transmit frequencies by the operator. This can
be overridden by an internal link in order to program new transmit
frequencies.
Enabling
Transmitter programming is enabled by shorting link 1 on the
Microprocessor Interface PCB (refer to Fig. 7.1). The status of the link is
noted by the microprocessor during the initialisation program; therefore it is
only necessary to short the link (e.g. with a pair of tweezers) at switch on.
Once the display panel is lit, the link may be removed but will remain
effective until power is switched off. It should be noted that normal
operation of the transceiver is inhibited in the programming mode. If it is
intended to change or delete existing P channels, refer also to Program
Inhibit Indication below.
Figure 7.1 Microprocessor Interface PCB
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