Operation
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The other method is called Momentary Channel Select. Using this method, the selection of
one or more console channels may be performed prior to sending a call. After the call is sent,
the channels used for the send will remain selected for the voice message that may follow.
Using this method, the control relays momentarily pulse a selecting signal to the console just
prior to sampling the channel busy and closing the PTT. None of the control relays are closed
while the call is being sent.
With either method, there is a programmable key-up delay for the period between the closure
of PTT and the generation of tones.
Calling Sequence Summary
The rest of this subsection is a summary of the calling sequences. The calling sequences
generated by SEND keys are different from sequences generated by Instant Call keys. Note
the use of the words “display” and “print”. In these summaries “display” refers to displaying
on the encoder status display, “print” refers to outputting from the Computer Port to a printer
or CRT. Also capitalized words that follow an arrow, , refer to yet another operation that is
broken down further in the paragraphs that follow.
Send Generated
1. Display “Send”
Print the send number
Print the programmed control relays to be used
2. Momentary channel select mode?
:Yes --> MOMENTARY SELECT
:No --> DIRECT KEYING
3. Is channel busy used and has it been busy for over 30 seconds?
:Yes - Skip to step 7.
4. Print time (if time clock installed)
5. Is call stack empty?
:No - Get next call from call stack
Display call number
Print call number
Is call valid?
:No - Print “?”
Issue two beeps
Go back to step 5.
:Yes - Close audio relay
Wait 100 milliseconds
Generate encoding tones
Wait the programmed inter-page gap (stack delay)
Go back to step 5.
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