Mds 4790-400 Mhz Notch-Type Duplexers; Mds 05-3438A01, Rev. F; Mds 4790/9790 Series I/O Guide; Mds 9790-Bandpass-Type Duplexers - GE MDS 4790 Series Installation & Operation Manual

CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
90
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MDS 4790—400 MHz Notch-Type Duplexers
You can change the radio's transmit frequency up to 100 kHz without
re-tuning the duplexer. The duplexers shown in
in the field by experienced technicians using high-quality test equip-
ment. For assistance, contact GE MDS Technical Support for additional
details about tuning.
Figure 42. 400 MHz Notch Duplexer
(No adjustment needed for transmit changes up to 100 kHz)
Duplexer alignment is a sophisticated procedure and a
duplexer can be easily damaged if not handled carefully. It is
highly-recommended that you return duplexers needing
re-alignment to GE MDS, or the original duplexer manufac-
turer, for alignment. In some cases, it may be more economical
to replace the unit than to have it re-aligned.
MDS 9790—Bandpass-Type Duplexers
These duplexers (Figure
change up to 500 kHz without undesired results. Since this type of
duplexer cannot be re-aligned in the field, we recommend contacting the
GE MDS Technical Support Department if you suspect a duplexer
problem or need one for a different frequency.
Figure 43. 900 MHz Bandpass Duplexer
(No adjustment needed for transmit changes up to 500 kHz)

MDS 4790/9790 Series I/O Guide

Figure 42
43) typically allow the transmitter frequency to

MDS 05-3438A01, Rev. F

can be aligned