General
The Vega 223C Series tone-remote adapters pro-
vide a reliable means of remotely controlling two-way-
radio base stations. The adapters can be used in con-
junction with Vega Models C-510C/C-511/C-512 (two-
frequency), Model C-514B (four-frequency), Model C-
516
(six-line/two-frequency),
Model
C-1614
(six-
line/four-requency,
and Model C-5110/C-5111/C-5112
(ten-line/four-frequency) tone-remote control consoles,
or other manufacturers' (such as Motorola and GE) re-
mote consoles which use the industry-standard se-
quential tone keying format.
The basic PC board in each adapter is the Model
223C, which provides PTT and monitor functions only,
on one operating frequency. A Model 224B expansion
board is added for every two frequencies. The first
224B plugs into an edge of the 223C, the second 224B
into the first 224B, and so on, in a chain. The 223C Se-
ries PC boards and adapters are available in the fol-
lowing models:
MODEL
DESCRIPTION
223C/PCB
PC board (no case); PTT/monitor only;
two-wire half-duplex) or four-wire (half-
duplex or full-duplex)
224B/PCB
Two-frequency expansion PC board
RC-223C
Encased single-frequency/PTT/monitor
transmit/receive adapter; includes com-
pact case (1.75 in H, 9.25 in W, 7.25
in D) and Model 223C PTT/monitor PCB
RP-223C
Same as RC-223C, but in rack-mounting
case (1.718 in H, 19 in W, 6.5 in D)
RC-223C-2
Encased two-frequency/PTT/monitor
adapter; includes compact case, Model
223C PTT/monitor PCB, and Model 224B
two-frequency expansion PCB
RP-223C-2
Same as RC-223C-2, but in rack-
mounting case
RP-223C-4
Encased four-frequency/PTT/monitor
adapter; includes rack-mounting case,
Model 223C PTT/monitor PCB, and two
Model 224B two-frequency expansion
PCBs
RP-223C-6
Encased six-frequency/PTT/monitor
adapter; includes rack-mounting case,
Model 223C PTT/monitor PCB, and
three Model 224B two-frequency expan
sion PCBs
RP-223C-8
Encased eight-frequency/PTT/monitor
adapter; includes rack-mounting case,
Model 223C PTT/monitor PCB, and four
Model 224B two-frequency expansion
PCBs
Options
LPO-1
Lightning and transient protection on-line
interface
TO-23
Transformer isolation on transceiver
interface
Operation
The 223C Series adapters are interconnected to the
distant remote control console(s) by any voice-grade
transmission medium such as a microwave link, a
leased telephone line, or a twisted-pair 600-ohm line.
All 223C Series adapters are capable of decoding
the PTT (push-to-talk/transmitter-on) tone sequence
and the voice-plus-tone signals during transmission.
The tone portion of the voice-plus-tone signal is re-
moved from the transmitted voice. All models are pre-
pared for jumper-plug conversion from two-wire-line
operation to four-wire-line operation. In the four-wire
mode, the panels also may be jumper-plug converted
to full-duplex operation.
The “monitor” function provided in all 223C Series
adapters decodes the valid tone sequence and pro-
vides relay-contact output to turn off the subaudible-
tone-decoder circuit in the radio receiver, allowing the
console operator to monitor the channel for other users
before he transmits (required by FCC regulations on
stations equipped with continuous-tone-coded-squelch
signaling). On single-user stations not equipped with
subaudible signaling, or where the CTCSS decoders
are disabled, the monitor function relay output may be
used for any purpose such as interrogation of a
status-reporting system at the station site. The monitor
function may be programmed to operate in one of three
modes:
2
223C Series
Table of Contents
General............................................................................................................................................................................2
Operation......................................................................................................................................................................2-3
Installation .......................................................................................................................................................................3
Tuning..............................................................................................................................................................................3
Level Adjustments........................................................................................................................................................3-4
Theory of Operation .....................................................................................................................................................4-6
Warranty and Claims.......................................................................................................................................................6
Specifications ..................................................................................................................................................................6
Parts List ......................................................................................................................................................................6-8
