microHAM STATION MASTER Manual page 36

Important considerations:
Station Master is used with micro HAM Keyer:
micro KEYER, micro KEYER II, DigiKEYER, CW Keyer, MK2R, or MK2R+
With microHAM keyers, Station Master or the keyer monitors both PTT output of the radio and the PAPTT signal
from the keyer. However, with VOX operation or FSK operation using MOX the radio can switch to transmit and
generate power before Station Master is able to switch all of the connected devices.
be sure that Station Master is connected according to the installation instructions
●
set the INHIBIT (INH) time slightly longer than the Switch Delay, any T/R delay in your power amplifier,
●
and/or longest sequencer lead delay.
make the PTT lead time in the KEYER equal to the INH time in Station Master. If your transceiver does
●
not have an inhibit input, make the PTT lead time slightly longer than the longest Switch Delay, T/R delay
or sequencer lead time.
WARNING: If your transceiver does not have an INHIBIT input or INHIBIT is not connected, the sequencer can
not protect your devices and prevent hot switching. Using VOX or FSK with MOX can result in switching
antennas with power applied when using split antennas for TX and RX. We strongly recommend that
you NOT use sequencer outputs or split TX/RX antennas without an INHIBIT connection when using a
power amplifier!!!
Station Master is used without a micro HAM keyer:
Station Master monitors the PTT output of the transceiver. This means that the radio has already switched to
transmit and can be generating power before Station Master has switched receive to transmit.
be sure that the SM is connected according to the installation instructions.
●
use zero (0) lead time for all sequencer outputs
●
set the INHIBIT (INH) time slightly longer that Switch Delay or any T/R delay in your power amplifier.
●
WARNING: If your transceiver does not have an INHIBIT input or INHIBIT is not connected, the sequencer can
not protect your devices and prevent hot switching. Antennas can be switched with power applied when
using split TX and RX antennas. We strongly recommend that you NOT rely on Station Master to bypass
receive devices or use split TX/RX antennas without an INHIBIT connection when using a power
amplifier!!!
TIP: If your radio does not have an INHIBIT input you may be able to use Station Master to bypass
receive devices or for split TX/RX antennas. To do so, the transceiver PTT must be controlled entirely by
footswitch or computer generated PTT; VOX, MOX and QSK can not be used.
Connect the footswitch and computer PTT output to Station Master's PTT IN connection in parallel. Set the Lead
time of one sequencer output slightly longer than any other lead time, Switch Delay and/or the T/R delay in your
power amplifier and connect this sequencer output to the PTT input of your transceiver. The sequencer output
used should be configured for common ground (sink) or be one of the isolated relay outputs B7-B10.
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