User's Manual Part 6


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  
9#8
&
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This is the control of 2 radios operated together, crossband or repeater linked.
1 Check that LINE-OUT is linked to
LINE-IN internally (LINK9 fitted).
Fit LINK15 to link KEYING to
OPTO-IN. This provides control in
both directions. The unit generat-
ing the keying signal is already Tx
inhibited.
2 Wire LINE-OUT (S21-5) on one
T2000 to LINE-OUT (S21-5) on the
other T2000. Wire KEYING (S21-6)
on one T2000 to KEYING (S21-6)
on the other T2000.
T2000
No. 1
-
+
Power Suppply
13.8V
4Ω
Speaker
Pwr/Spr
T2000
No. 2
-
+
Power
Suppply
13.8V
4Ω
Speaker
Pwr/Spr
HD
D-Range
HD
D-Range
Line Out to Line Out
Keying I/O to Keying I/O
3 The time delay circuit may be required to eliminate squelch noise bursts for cross-
band operation with repeaters. LINK23 enables this circuit, which is adjustable
using RV3 (refer to Section 8.14.4, “T2000-80 Set-Up”).
 The 2 wire circuit assumes that the 2 radios are effectively earthed together at
either the power supply or the power connector.
 A high line level is desirable to avoid earth noise i.e. 0dBm (0.775Vrms).
!3()(
Crossbanded radios i.e. UHF/VHF, can be achieved by using space isolated antennas to
avoid de-sensing, as shown below.
Alternatively, in-band linked radios will require a duplexor to feed a common aerial.
T2000
No. 1
T2000
No. 2
-
+
-
+
Power Suppply
13.8V
Power Suppply
13.8V
4Ω
Speaker
4Ω
Speaker
Pwr/Spr Pwr/Spr
Duplexor
Common Antenna UHF AntennaVHF Antenna
RF
RF