micro
HAM ©
2016
All rights reserved
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
.
●
A
HIGH
output indicates that the relay contact is
CLOSED
.
●
When the polarity of a sequencer output is normal (the INVERTED box is not checked), the output is
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
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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