ZETRON 37-MAX, Installation Manual

Page: 22 / 90

Section 3. Operation
3-6
Morse Code Transmission Speed = The 37-MAX defaults to transmitting its Morse
code characters at 22 words per minute, however, it can be set to transmit them at
only 11 words per minute.
In order to program the actual call sign into the 37-MAX, all of the characters are converted
into pairs of DTMF numbers using the table provided “Station ID Call Sign” in Section 4.
They can then be entered into the nonvolatile memory of the tone panel while in the
programming mode. The default condition for the call sign memory is blank, and returning it
to a blank condition will stop the panel from transmitting its ID, even if the rest of the ID
programming is left in an enabled state.
Reserved Mode Users
If the tone or code decoded by the 37-MAX during a transmission belongs to a user that has
been placed in the Reserved mode, then the panel mutes the repeat audio path and transmits a
covering beep tone to let anyone monitoring the channel know that a reserved user has been
brought up. When the transmitting radio user unkeys, the 37-MAX will send out a tone to let
that user know about the reserved status as well.
Courtesy Tone
Even when the users involved are experienced users (and especially if one or more are novice
users), there can be a good deal of airtime wasted with both parties to a conversation waiting
because they were all uncertain whether the speaker has actually unkeyed and is waiting for a
response. The Courtesy Beep feature was developed to help reduce this problem. If it is
enabled for the user group in question, then, when the 37-MAX senses that the transmitting
radio user has unkeyed, it will transmit a short beep tone right after it mutes the repeat audio
path to provide listeners with an audible indication that the user who was speaking has
unkeyed.
Because this feature tends to be one that users either really like a lot, or can't stand at all, it
defaults to being disabled, and it can be enabled on a per-user basis.
Under system programming, the technician can set the pitch of the beep tone used for the
Courtesy beep. The default is 1000 Hz, with alternate choices of 500 Hz or 1500 Hz. There is
only one pitch selection available, so all courtesy tone users will hear the same one.
SYSTEM OPERATION ISSUES
This subsection covers some features that affect the operation of the 37-MAX on a system-
wide basis.
Repeater Time-out Timer
Whenever the panel keys up its own transmitter, it starts a timer to keep track of how long the
transmitter has been keyed. If carrier with a valid tone or code has kept the repeater keyed
long enough for the Repeater Time-out Timer to reach its limit, then the 37-MAX will unkey
the transmitter and remain unkeyed until the receive signal stops. Once the offending carrier