microHAM STATION MASTER Manual page 35

Sequencer:
Source PTT:
The first line, labeled Source PTT, shows the behavior of the PTT control signal. Source PTT
represents any PTT that can indicate to Station Master that the transceiver is being, or has been
switched into transmit and Station Master should take the appropriate action.
INHIBIT output:
The second line shows operation and timing of the INHIBIT (INH) output used to prevent the radio
from generating power. When the INH output is low, the radio is allowed to generate RF power. The
INH time should always be larger than the lead time setting of any sequencer output, the Antenna
Switch and BPF switching delay plus the break-before-make delay, and/or PA switching delay.
IMPORTANT: Setting the correct INH time is critical for proper, hot switch free control of all devices
connected to the Station Master.
Sequenced outputs:
All other lines describe the timing of the sequencer outputs. These are any of the outputs defined as
SEQ class outputs on Outputs tab. The lead time (operate delay), tail time (release delay) and
output polarity can be set independently for each output.
Sequencer output level and polarity
A LOW output indicates that the relay contact is OPEN.
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A HIGH output indicates that the relay contact is CLOSED.
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When the polarity of a sequencer output is normal (the INVERTED box is not checked), the output is
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LOW whenever it is disabled for particular band (on the Bands tab) or the transceiver is in receive mode.
When the radio is switched to transmit, the sequencer output goes HIGH after the selected LEAD delay
and remains HIGH until the transceiver returns to receive. When the transceiver returns to receive mode,
the sequencer output goes LOW after the tail delay.
When the polarity of a sequencer output is inverted (the INVERTED box is checked), the sequencer
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output is LOW whenever it is disabled for particular band. When the sequencer output is enabled and
the transceiver is in receive the output is HIGH. When the radio is switched to transmit, sequencer
output will go LOW following the LEAD delay and remains LOW until the radio returns to the receive
state. When the transceiver returns to receive, the output will go HIGH state following the tail delay.
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