User's Manual

PAGE 12 DESCRIPTION
Noise and dust build up can be reduced by keeping cabling and other obstructions out of
the main airflows.
There are no dust filters fitted in this product. If it is to be used in very dirty environments,
then additional steps should be taken to prevent ingress of dust as this will affect thermal
performance. Filters should only be used in external cabinets if they can be regularly
maintained.
3.2 SRM9000 SUB-ASSEMBLY
The RF performance of this product is derived from a pair of SRM9000 RF PCBs mounted
on a Heatsink sub-assembly that is designed to permit continuous operation at full power.
The sub-assembly also provides RF screening, so it is important that it is accurately
assembled and reassembled.
The sub-assembly has a plate attached to the rear edge with two quarter-turn fasteners for
rapid removal.
The unit is retained in the Blade chassis by the front edge of the Heatsink that inserts
underneath the fan baffle, the rear of the subassembly is held in place by the quick
release fasteners.
These units are electrically identical to SRM9000 and are also fully interchangeable in the
25W power group (the Transmit module is different for the 100W systems). Control is
provided via the 26-way ribbon connector. Power is supplied via the DB-15 connector and
RF signals are coupled to the BNC sockets with double-screened cables.
3.3 SPECIFICATIONS
3.3.1 General
Channel
Bandwidth
12.5kHz (11K0F3EJN), 20kHz (14K0F3EJN) or 25kHz (16K0F3EJN)
selectable per channel
Modulation
Freq. F3E (voice) pre-emphasised/flat, or FFSK data (1200 or
2400bps)
Frequency
Bands
E0: 66-88MHz. AC: 136-174MHz. K1: 174-208MHz.
KM: 208-245MHz. R0: 310-350MHz. R1: 335-375MHz.
TK: 400-450MHz. TU: 400-480MHz UW: 440-500MHz.
WR: 470-530MHz.
Stability
± 2.0ppm
Temperature
-25C to +55C Operating (Full Spec.) -40C to +80C Storage
Antenna
Connect
2 x 50Ω female N-type
Environmental
IP20 ingress protection, Humidity <95% non-condensing