LT23S Connectors and Controls
Front Panel Features
‘ON’ switch |
This controls the DC power
to the unit. The LED is lit for normal
operation. |
‘TX’ switch |
Allows manual switch-over
to transmit. The LED is lit on
transmit. |
‘F1 - F2’ switch |
Selects of one of two
crystal oscillators. The frequency 2
(F2) oscillator has a crystal fitted for the default IF range. The switch
allows the default IF range, as quoted
in the technical description, to be
overridden. |
‘Power Output’ |
Reads UHF power output
directly in |
Rear Panel Connectors
‘1296 MHz out’ |
Provides a maximum 10W UHF
output on transmit. |
‘144 MHz in/out’ |
Connection to 2m
transceiver. Do not exceed the maximum
drive power! Always keep to the minimum
2m drive necessary. |
‘+/- 14.5V’ |
A heavy-duty cable should
be used for connection to the power supply.
A supply voltage of 12V is not enough for the LT23S to produce an
output of 10 Watts; this voltage would
produce a maximum output power to
approx. 7.5 Watts. The supply voltage (14.5V)
should be measured directly at the connection to the LT23S when transmitting
with full power. |
‘P.T.T.’ |
‘Cinch’ socket for
connecting the P.T.T. line from the transceiver. Grounding this terminal switches
the LT23S to transmit. |
“+ Relais” (+ relay) |
On receive this terminal shows a voltage of approx.
14V (measured with respect to earth potential). This voltage is used to power
the antenna relay. In addition, it can be used to power an external GaAs
FET pre-amplifier. |
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© GJ Coyne & G Mussler Dec-2003