microHAM STATION MASTER Manual page 54

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For each antenna assign a name, label and check which output or outputs are active when the antenna is
selected.
IMPORTANT: Antennas with multiple options must be defined separately for each option. The 80/75m dipole
and both four squares are "multiple option" antennas.
The 80/75m dipole has only one feedline connected to the switch but has a relay which must be turned OFF for
the CW part of 80 meters to bypass the matching circuit for SSB. The relay must then be turned on for the
antenna to be matched on 75m. For operator the same antenna is used in both parts of the band but for Station
Master the dipole looks like two different antennas because the outputs are different. The dipole is defined two
times - in both cases A2 is activated to select the proper feedline but A9 is only activated on 75m/SSB to select
the matching network.
The same logic is applied for the 80m four square. There is only one feedline but relays are activated in the
phasing network to switch the antenna pattern in four directions. Switching is provided by two 12V control lines
in BCD code (4 combinations). No matter which direction has been chosen, A3 is always activated to select the
proper feedline while B7 and B8 control the direction. The 4SQ is defined four times – once for each direction -
with different settings for B7 and B8.
Controls for the receive 4SQ are identical to the 80m 4SQ other that using outputs A8, B9 and B10 instead of
A3, B6 and B7. Because this antenna is receive only and it can not be used for transmitting, all four entries are
marked as RX ONLY and Station Master will not allow it to be used for transmitting. In addition, the receive
4SQ includes a preamplifier to compensate for its reduced signal output – the preamplifier must be turned off
when transmitting on nearby antennas or when it is not used (operation on other bands). The is accomplished
using A10 and will be described in the sequencer section.
Additional settings
The 3el 40m Yagi, 5el 12m Yagi and SteppIR Yagi are located on same tower and their azimuth is controlled by
a single rotator connected to Station Master's rotator controller. The ROTATOR check boxes must be checked
for all these three antennas. Because the 3el is turned 90deg counter clockwise and the 5el Yagi is turned
90deg clockwise compared to SteppIR, a -90deg azimuth offset must be set for the 3el Yagi and a +90deg offset
set for the 5el Yagi. The SteppIR has no offset. Setting the offsets corrects the azimuth reading on the LCD and
for computer control straight.
For advanced SteppIR support from Station Master, the SteppIR controller must be connected to the serial port,
the SteppIR box must be checked, the Serial port function must be set for the proper SteppIR model and the
correct baud rate must be set.
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