OPERATION
3-7
Revised February 1997
Part No. 001-9750-005
If LTR or conventional systems are also
programmed, they are skipped in the scan sequence
because only Multi-Net systems are scanned. If an
attempt is made to enter scanning on with an LTR or
conventional system displayed, scanning can be
selected only if Multi-Net auto-registration is enabled.
Auto-registration then occurs and scanning begins on
that site. If auto-registration is not programmed, an
error tone sounds, “NOT MULTI” is displayed, and
the scan mode is not entered.
The single-site type of scanning is very efficient
because only the status repeater of the site is moni-
tored which means that no waiting is required to
change channels. The data from the status repeater is
checked against the home repeater/group ID codes of
all selectable systems programmed with that site
number. If there is a match, the transceiver switches to
the appropriate repeater and receives the call.
If no traffic is detected on the status channel for a
period of time, the transceiver begins scanning the
home repeaters of all systems programmed with the
site number being scanned. This ensures that scanning
occurs even if the status repeater is not on the air. The
status channel also continues to be scanned, and
normal scanning of the status channel resumes when
messages are again detected. When home repeaters are
scanned, data messages are decoded for only as long
as necessary to detect all calls on that repeater.
Multiple-Site Scan -
This type of scan is programmed
when more than one site is scanned or if LTR or
conventional systems are to be scanned. The status
channels of Multi-Net systems are scanned as are the
home repeater of LTR systems and the channels of
conventional systems. As with Single-Site Scan, if the
status channel of a particular Multi-Net site is not in
service, the home channels are scanned until messages
are again detected on that status channel. All system/
groups in the current bank (see Section 3.6.6) are
scanned unless they are deleted from the scan list.
3.4.3 SCAN RESUME DELAY
NOTE: The following timers are also used is some cir-
cumstances when not scanning, such as when priority
or block calls are received as described in Section
3.3.4.
Receive Delay
When a message is received while scanning, there
is a programmable delay of 0-7 seconds before scan-
ning resumes (if it has not been disabled, such as by
taking the microphone off-hook). This delay is called
Receive Delay Time and it prevents another message
from being received before a response can be made.
This delay is also in effect if a front panel control is
changed while scanning such as to select another
system/group. This timer is reset if another call is
received.
Transmit Delay
The Receive Delay Time controls the scan delay
until the transmitter is keyed and then the Call Delay
Time controls the delay. This time is also program-
mable for 0-7 seconds and it ensures that a response to
your message is heard instead of some other message
occurring on another system/group. The Call Delay
Timer remains active for the remainder of the conver-
sation and controls when normal scanning resumes
even if additional responses are received.
Scan Continue Timer
There is also a scan continue timer that can be
programmed. This timer controls the maximum time
that a call is received before scanning resumes. This
prevents scanning from being delayed for long periods
by lengthy calls. This time can be programmed for 0-
60 seconds in 1-second increments. If “0” is
programmed, there is no time limit and the entire
message is always received.
3.4.4 TRANSMITTING IN THE SCAN MODE
NOTE: If Auto-Registration is used, the revert system
may change automatically. Refer to Section 3.7.2 for
more information.
Programming of the “Scan Revert Mode” radio
parameter determines the system/group on which
transmissions occur in the scan mode. In addition, if
this programming causes the selected system/group to
change, it affects the system/group that is selected
when the scan mode is exited by pressing the Scan
switch. An exception when it does not control the
transmit system/group is if the bank is programmed
Summary of Contents for Summit DM 975x
Page 105: ...MULTI NET SYSTEM OVERVIEW 5 10 Revised February 1997 Part No 001 9750 005 ...
Page 108: ...CIRCUIT DESCRIPTION 6 3 August 1993 Part No 001 9750 001 Figure 6 1 Transceiver Block Diagram ...
Page 123: ...CIRCUIT DESCRIPTION 6 18 August 1993 Part No 001 9750 001 ...
Page 131: ...SERVICING 7 8 Revised January 1995 Part No 001 9750 003 ...
Page 156: ...9 19 Revised December 2000 Part No 001 9750 007 TRANSCEIVER EXPLODED VIEW PART 1 ...
Page 168: ...Revised January 1995 Part No 001 9750 003 10 11 INTERCONNECT SCHEMATIC ...
Page 169: ...Revised January 1995 Part No 001 9750 003 10 12 DISPLAY BOARD SCHEMATIC ...
Page 171: ...Revised January 1995 Part No 001 9750 003 10 14 RF BOARD SCHEMATIC REVISED 800 MHZ ...
Page 172: ...Revised January 1995 Part No 001 9750 003 10 15 RF BOARD BOARD LAYOUT ALL 800 900 MHZ ...
Page 173: ...Revised January 1995 Part No 001 9750 003 10 16 RF BOARD BOARD SCHEMATIC 900 MHZ ...
Page 174: ...Revised January 1995 Part No 001 9750 003 10 17 RF BOARD BOARD SCHEMATIC UNREVISED 800 MHZ ...
Page 178: ...Revised January 1995 Part No 001 9750 003 10 21 PA BOARD SCHEMATIC 900 MHZ 30W ...
Page 179: ...Revised January 1995 Part No 001 9750 003 10 22 PA BOARD SCHEMATIC 900 MHZ 15W ...
Page 181: ...Revised January 1995 Part No 001 9750 003 10 24 PA BOARD SCHEMATIC UNREVISED 800 MHZ 35W ...
Page 182: ...Revised January 1995 Part No 001 9750 003 10 25 PA BOARD SCHEMATIC UNREVISED 800 MHZ 15W ...
Page 183: ...Revised January 1995 Part No 001 9750 003 10 26 AUDIO LOGIC BOARD SCHEMATIC PART 1 OF 2 ...
Page 184: ...Revised January 1995 Part No 001 9750 003 10 27 AUDIO LOGIC BOARD SCHEMATIC PART 2 OF 2 ...
Page 185: ...Revised January 1995 Part No 001 9750 003 10 28 AUDIO LOGIC BOARD LAYOUT TOP VIEW ...
Page 186: ...Revised January 1995 Part No 001 9750 003 10 29 AUDIO LOGIC BOARD LAYOUT BOTTOM VIEW ...
Page 188: ...Revised January 1995 Part No 001 9750 003 10 31 REMOTE TRANSCEIVER INTERCONNECT SCHEMATIC ...
Page 189: ...Revised January 1995 Part No 001 9750 003 10 32 REMOTE CONTROL UNIT INTERFACE BOARD SCHEMATIC ...
Page 216: ...Part Number 001 9750 007 12 00 hph Printed in U S A ...
