Trunking Operation - Pyramid SVR-200 LA Service Manual

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
portable-to-base transmissions that are being repeated through the mobile.
If the users wish to communicate portable-to-portable 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 portable-to-base.
RTX: Repeater transmit indicator.
MCOR: Mobile unmute detector indicating a condition to repeat base-to-portable.
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
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