Motorola GR300 Regenerated TPL/DPL/CSQ, Carrier Repeat, Reserved Users, When a User Unkeys Radio

Models: GR300

1 42
Download 42 pages 48.6 Kb
Page 17
Image 17

Section 3

Operation

Regenerated TPL/DPL/CSQ

When you key the transmit radio, depending on the programming, the ZR310 will

Encode nothing for carrier squelch

Regenerate the received TPL ton or DPL code

Encode a different TPL tone or DPL code (cross-tone encoding)

Carrier Repeat

The ZR310 can also be configured as a "carrier repeater", or sometimes called an "open repeater". In this mode, any activity on the receive radio causes the transmit radio to key.

The ZR310 can also provide tone control (TPL/DPL) and open repeater operation simultaneously. In other words, users that have no encode (CSQ) repeat just like users that have TPL or DPL encode. This allows a mix of TPL/DPL users with one repeat capability and is ideal when upgrading TPL/DPL users to an existing open repeater channel.

To enable carrier repeat, a user number is identifies as the "carrier" repeater user. This allows all standard user programmable features for open repeat, including enable/disable for the carrier user, TPL or DPL encode encoding, courtesy tone, etc. If the user number is set to "0", no carrier repeater is available.

Reserved Users

If a user is "reserved", the repeat audio will be squelched an a beep tone sent on the transmit audio when the user tries to use it. A chirp tone is sent when the user unkeys to indicate reserve mode.

When a User Unkeys Radio

When a user radio unkeys, or the TPL/DPL is no longer detected, the ZR310 will take some actions. The following paragraphs describe possibilities of that action.

Morse Code Station Identification

When an enabled user unkeys, the ZR310 checks how long it has been since the last time the station ID has been sent. If the time has been longer than the Morse ID interval time (initially 15 minutes, user programmable 1-99 minutes), then the ZR310 sends the call sign. Each user group has its own call sign and individual ID interval timer. The Morse ID is sent at the selected ID speed of between 4 and 25 words per minute. The call is sent at 30% deviation (FCC part 90 rules) so that voice communication still occurs during the voice ID.

NOTE

If the Morse ID is not programmed, or the first

character is programmed as a "space", no ID is sent. You can program a single system ID for use in co-op and private carrier applications.

March, 1993

6880902Z68-O

Section 3-2

Page 17
Image 17
Motorola GR300 service manual Regenerated TPL/DPL/CSQ, Carrier Repeat, Reserved Users, When a User Unkeys Radio