E.F. Johnson Company 7780 Series, Preliminary Service Manual

Page: 34 / 116

TRANSCEIVER OPERATION
2-20
November 1999
Part No. 001-7780-500
currently registered on a site, “SITE x” is displayed,
where “x” is the site number. If the site is locked (see
following), “LOCK x” is displayed instead. The
display then indicates the RSSI (Receive Signal
Strength Indicator) value of the current site as “RSSI
x” and then returns to displaying the channel alias.
Searching For a New Site
To display the RSSI level of the current site, press
the Site Search option switch (if programmed). The
current site number is then displayed as “SITE x”
followed by the RSSI level as “RSSI x”. If the Site
Search option switch is not pressed again, this mode is
automatically exited and the normal channel informa-
tion again displayed.
To scroll through the other programmed sites,
repeatedly press the Site Search option switch while
“SITE x” or “RSSI x” is displayed. Each time it is
pressed, the information for the next site is displayed.
To select the displayed site, simply do not press the
switch again and that site is selected when the normal
channel display returns. If site lock is on when site
search is entered (see following), the radio will be
locked on the new site when this function is exited.
Locking/Unlocking a Site
It is sometimes desirable to stay on the current
site regardless of signal level. To lock the radio on the
current site so that it does not search for another, press
the Site Lock option switch (if programmed). The
display then momentarily indicates “LOCK x” to indi-
cate that the current site is locked (“x” is the current
site number). To unlock the site, press the Lock switch
again and “UNLOCK” is momentarily displayed.
When locked on a site, it is still possible to search
for a different site using the site search function
described in the preceding section. When a new site is
found, the radio is then locked on that site.
2.6 SUPERVISORY TONES
Single Beep (Alert Tone)
•
Power was turned on and a successful power-up
sequence occurred (Section 2.3.2).
•
The time-out timer is about to expire or the penalty
timer has expired (Sections 2.3.9 and 2.4.7).
•
The conversation timer is about to expire (Section
2.4.8).
•
The system received your page but the paged mobile
is not on the air (Section 2.5.7).
•
Telephone interconnect is not operational (Section
2.5.6).
Continuous Tone (Invalid or No Acknowledge
Condition)
•
A transmission is being attempted on an unpro-
grammed channel or a conventional channel
programmed as receive-only.
•
The transmitter is disabled by the busy channel
lockout feature (Section 2.4.5).
•
The transmitter has been disabled by the time-out
timer feature (Section 2.3.9).
•
The transmitter has been disabled by the conversa-
tion timer (Section 2.4.8).
•
An out-of-range condition exists (SMARTNET/
SmartZone only).
•
A transmission is being attempted before the penalty
timer has expired (Section 2.4.7).
•
Dynamic regrouping has been exited but the
dynamic regrouping channel is still selected
(Section 2.5.13).
•
The paged mobile did not acknowledge the page
(Section 2.5.7).
•
The message that was sent has not been acknowl-
edged (Section 2.5.8).
•
The status condition that was sent has not been
acknowledged (Section 2.5.9).
Single Short Medium-Pitch Tone
•
A valid key has been pressed.
Single Short Low-Pitch Tone
•
An invalid key has been pressed.
Six Beeps (Recurring)
•
The page was received (Section 2.5.7).
Three Beeps (Recurring)
•
A unit-to-unit call was received (Section 2.5.4).