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The remote unit would typically be used when the radio you are using has no direct tuner
interface. The remote unit is also required when using the FT-100D One Touch Tune from W4RT
Electronics. See www.w4rt.com for more information.
Radio Interfaces:
LDG supplies optional custom interface cables to connect the tuner to Icom or
Alinco radios (RT-IC for Icom or RT-AL for Alinco). To install the cable, turn off the radio and
connect the DB9 connector to the matching port on the RT-11. Connect the Molex connector on
the other end to the radio’s tuner port. Connect a coax lead from the radio to the Transmitter input
port on the RT-11, and a coax cable from the Antenna port to your antenna. Turn the radio on; the
RT-11 will power up along with the radio -- no external power source is required. On Icom radios,
the Tuner LED will light to show that the tuner is connected.
To operate the tuner, simply press the tuner button on the radio. The radio will automatically
change to CW mode, set output power to 10 watts and command the RT-11 to begin a tuning
cycle. The RT-11 will automatically complete the tuning cycle, and send a command to the radio to
signify it is finished with tuning. The radio will then revert to its previous mode and power settings.
The LDG cables for Icom and Alinco radios are typically 15 feet long. For longer lengths, extend
them using standard DB-9 cables (again, be sure that all wires are straight through (pin 1 to pin 1,
pin 2 to pin 2, etc.), and not “null modem” or some other specialized configuration).
The LDG K-OTT interfaces directly to the Kenwood TS-50’s ACC port. Power for the RT-11 is
provided through the TS-50. The AT Tune button the front panel of the TS-50 is then used to
initiate a tune. Operation is similar to the Icom and Alinco interfaces.
User-provided control
: You can easily build a custom interface for your particular installation.
You can use all, or as little as two control wires to the tuner. For two-wire control, only DC power
and ground are required. The tuner will automatically execute a tuning cycle if RF is present at
power-up. You can simply insert a momentary open switch at the control location on the +12 DC
power line to control the tuner. Cycling power to the tuner with RF present will execute a tuning
cycle.
A word about tuning etiquette
: Be sure to pick a vacant frequency to tune. With today’s crowded
ham bands, this is often difficult. However, do your best to avoid interfering with other hams as you
tune. The RT-11’s very short tuning cycle, usually only a few seconds, minimizes the impact of your
tuning transmissions.
Summary of Contents for RT-11
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