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If another unit were to arrive from a different scene and it is still the active priority, there will be two active
repeaters on the air when a condition to repeat exists. When one of the SVR-200s unkeys to check for handheld
activity, it will detect the presence of the other active SVR-200 and increment it's priority counter and cease
transmission. This is the self clearing mode to prevent radio collisions.
If the handheld operator is out of the vehicle and their partner still in the vehicle were to key the mobile
radio using the local mic, the SVR-200 will detect the local PTT and repeat the transmission to the other
handhelds so that both sides of the conversation will be heard by everyone on the link. The local mic repeat
function can be enabled/disabled via the PC software.
The SVR-200 also has a local receive audio speaker jack that enables the person in the vehicle to monitor
handheld to base transmissions that are being repeated through the mobile.
If the users wish to communicate handheld-handheld without accessing the mobile repeater, they may
transmit on the same frequency without CTCSS (or a different CTCSS); the SVR-200 only responds to carrier
and proper tone from the handhelds.
Trunking operation
When the SVR-200 is connected to a trunking mobile and the handheld operator wishes to access the system,
they key their handheld briefly then release. The SVR-200 will attempt to acquire a voice channel on the trunking
system by keying the mobile for 200mS and monitoring the on-air detect line from the mobile. If it does not
see the radio transmit at all (system is busy), it will send a low tone to the hand held operator to alert them that
the system is busy. The SVR-200 will automatically retry every 5 seconds and send busy tone to the handheld
with each unsuccessful attempt to indicate progress of the call attempt. If unsuccessful after 30 seconds, the
SVR-200 will transmit intercept tone to alert the handheld operator that the call attempt failed.
When the SVR-200 detects that the mobile is transmitting, it will continue to monitor the on-air line until
the transmitter remains keyed for at least 250mS to ensure that the radio is merely handshaking or retrying. After
successful acquisition of a voice channel, it will continue to hold the mobile PTT active for 2 seconds and
transmit a go-ahead blip to the handheld operator. The user then keys their handheld to speak on the voice
channel. If the user does not key up within the 2 second period, the SVR-200 will unkey the mobile and send
intercept tone as before.
If the user keys their handheld only once, or they key the first time for more than 1 second, the SVR-200
will cancel the call attempt and send intercept tone to the handheld operator. All of the queuing and error tones
will only be sent if the handheld is not transmitting to ensure that the user hears the proper tones.
LEDs
CPU:
Flashes at a 1 Hz rate to indicate proper operation of the microprocessor.
PRI:
When on, indicates that the unit is at priority count zero and will repeat all transmissions.
RCOR:
Repeater Carrier detect.
RTONE:
Repeater sub-audible decode; when on, indicates a condition to repeat handheld to base.
RTX:
Repeater transmit indicator.
MCOR:
Mobile unmute detector indicating a condtion to repeat base to handheld.
MTX:
Mobile transmit indicator.
OPT:
Should be on steady during programming operations only. If OPT LED flashes at 10Hz rate, it
is an indication that the PLL did not lock within the allotted 50mS and the unit should be serviced.
SVR-200 Service Manual
Page 5
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