Here is what I did to bandswitch a model 253 (which has similar connector /
pin number / and voltage - current requirements);
1. Use a program similar to DXLab Commander which allows the use of
frequency dependent device tables. See
(http://www.dxlabsuite.com/dxlabwiki/FrequencyDependentDevices) and
(http://www.dxlabsuite.com/dxlabwiki/ControlAntennaSwitch).
2. I purchased a couple BCD-10 Band Decoders
(http://www.unifiedmicro.com/decoder.html) from Unified Microsystems (W9XT).
3. I purchased DIP relays and sockets (but any low current coil relay would
work)... you need one relay for each band output.
4. use a small box with two 25 pin RS-232 female connectors for input and
output.
5. map the computer parallel port output voltages to the appropriate decoder
input lines.
6. map the decoder outputs to each appropriate band relay and the relay
outputs to the appropriate pin on the RS-232 connector going to the Herc
band decoder input.
As your Omni-VII sends its frequency information via its serial port, the
computer will generate a BCD digit output on the parallel port, which is
decoded, causing a relay to apply voltage on a band line, which if you map
everything properly will put the Herc on the same band as the Omni-VII.
Good luck.
73 & DX,
Gary - AB9M
-----Original Message-----
From: Carl Gansen
Sent: Monday, July 21, 2014 9:33 PM
To: tentec@contesting.com
Subject: [TenTec] Interfacing O-VII with Herc II (Model 420)
I have been looking for a solution here as well. None has been found so...
I am tinkering with the idea of using a virtual port from N4PY linked to
a serial port on an Arduino or ChipKit Uno board and using the IO lines of
the
board to toggle lines. I have had some initial success but have not had much
time to support it. It is tentatively a winter project. I intend to use it
with my
Eagle and Hercules II.
I also have an Arduino board reading the band output of the Orion and
generating the
BCD code for an Elecraft KPA500.
If others have pursued similar ideas, it would be fun to compare notes.
--
Carl R. Gansen WB0CFF
9300 W225th Street
Belle Plaine, Mn 56011-4206
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