Helical Filter Adjustment - GE MDS 4710A Technical Manual

36
FCC Identifiers:
DATA CHARACTERISTICS
Signaling Type:
Data Interface Rates:
Data Latency:
PRIMARY POWER
Voltage:
TX Supply Current:
RX Supply Current:
Power Connector:
Fuse:
ENVIRONMENTAL
Humidity:
Temperature Range:
Weight:
Case:
DIAGNOSTICS INTERFACE
Signalling Standard:
Connector:
I/O Devices:

6.2 Helical Filter Adjustment

If the frequency of the radio is changed more than 5 MHz, adjust the
helical filters for maximum received signal strength (RSSI) as follows:
1. Remove the top cover from the transceiver by loosening the four
screws and lifting straight up.
2. Locate the helical filters on the PC board. See
3. Apply a steady signal to the radio at the programmed receive fre-
quency (–80 dBm level recommended; no stronger than –60 dBm).
This can be done with a signal generator or an over-the-air signal.
MDS 4710/9710 Technical Manual
E5MDS9710N (928–960 MHz)
E5MDS9710N-1 (806–940 MHz
E5MDS4710 (403–512 MHz)
EIA/RS-232; DB-25 Female connector
1200–19200 bps, asynchronous
10 ms maximum
13.8 Vdc Nominal (10.5 to 16 Vdc)
Negative-Ground Systems Only
2.5 A (Maximum) @ 5 W RF Output
Operational—125 mA, Nominal
Standby (sleep)—15 mA, Nominal
2-pin polarized & locking connector
4 A Thermal Fuse, Self-Resetting, Internal
(Remove primary power to reset)
95% at 40 degrees C (104°F), non-condensing
–30 to 60 degrees C (–22°F to +140°F)
1.0 kilograms
Die-cast Aluminum
RS-232
DIAG—RJ-11 (Dedicated)
DATA INTERFACE—DB-25
(Alternate, See "Performing Network-Wide Remote
Diagnostics" on Page 37)
GE MDS Hand-Held Terminal,
PC with GE MDS software,
or other Terminal Communications program.
Figure 12 on Page
MDS 05-3305A01, Rev. E
37.