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YT-100 OPERATIONS MANUAL
MANUAL REV D
LDG YT-100
Automatic Tuner for
Yaesu FT-100 and
FT-857/897 Transceivers
LDG Electronics
1445 Parran Road
St. Leonard MD 20685-2903 USA
Phone: 410-586-2177
Fax: 410-586-8475
ldg@ldgelectronics.com
www.ldgelectronics.com
PAGE 1
Table Of Contents
Introduction
Jumpstart, or “Real hams don’t read manuals!”
Specifications
An Important Word About Power Levels
Important Safety Warning
Getting to know your YT-100
Front Panel
Rear Panel
3
3
4
4
4
5
5
6
Installation
Compatible Transceivers
FT-100, FT-100D Installation:
FT-857 and FT-897 Installation
Finishing Up Installation
7
7
8
9
9
Operation
Power-up
Basic Tuning Operation
A Note About Tuning on the FT-100/FT-100D
Toggle Bypass Mode:
Initiate a Memory Tune Cycle:
Force a Full Tune Cycle:
Status LED
10
10
10
11
12
13
14
15
Application Information
Mobile Operation
Remote Operation
MARS/CAP Coverage
Operation with a PC / CAT
15
15
16
16
16
Theory of Operation
The LDG YT-100
A Word About Tuning Etiquette
Care and Maintenance
Technical Support
Two-Year Transferrable Warranty
Out Of Warranty Service
Returning Your Product For Service
Product Feedback
18
20
21
21
21
21
22
22
22
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INTRODUCTION
LDG pioneered the automatic, wide-range switched-L tuner in 1995. From its laboratories in St.
Leonard, Maryland, LDG continues to define the state of the art in this field with innovative automatic
tuners and related products for every amateur need.
Congratulations on selecting the YT-100 100-watt automatic tuner for the Yaesu FT-100, FT-857
and FT-897 transceivers. The YT-100 provides semi-automatic antenna tuning across the entire HF
spectrum plus 6 meters, at power levels up to 125 watts. It will tune dipoles, verticals, Yagis, or virtually
any coax-fed antenna. It will match an amazing range of antennas and impedances, far greater than some
other tuners you may have considered, including the built-in tuners on many radios.
The YT-100 is similar to previous LDG tuners, but is specially engineered to integrate with your
Yaesu FT-100/857/897 HF radio. The YT-100 connects to the CAT (Computer Automated Transceiver)
port on the back of the radio. The CAT interface allows an external device such as a PC or the YT-100
to control the FT-100/857/897 by sending it serial commands. The YT-100 takes advantage of this
interface to simplify the tuning process -- one button push is all that is needed in order to switch the
radio to AM mode, reduce output power, transmit a carrier, measure the transmit frequency, and then
restore the radio to its previous mode and power level!
The YT-100 is powered by the transceiver’s CAT interface itself, so there is no additional power
cable required to use the YT-100. Latching relays are used, so the YT-100 consumes no power when not
tuning.
JUMPSTART, OR “REAL HAMS DON’T READ MANUALS!”
Ok, but at least read this one section before operating the YT-100:
1. Turn off power to your FT-100/857/897 radio.
2. Connect the HF/50 MHz antenna jack on the transceiver to the “TX” jack on the YT-100, using the
supplied 50 ohm coax cable jumper.
3. Connect a 50 ohm coax antenna feedline to the “ANT” jack on the YT-100.
4. Connect one end of the supplied radio interface cable to the “CAT/Linear” port on the back of your
FT-100/857/897 radio.
5. Connect the other end of the supplied radio interface cable to the “Radio” jack on the back of the
YT-100.
6.
FT-100:
Turn on power to your transceiver. Once it powers up, hold in the F key for one second to
access the extended menus. Rotate the SEL knob until menu #61, “TUNER/ATAS” appears. Rotate
the dial knob until “off” is selected. Hold in the F key again for one second, to return to normal
operation.
7. FT-857/897:
Turn on power to your transceiver. Once it powers up, hold in the FUNC key for one
second to access the extended menus. Rotate the SEL knob until menu #019, “CAT RATE” appears.
Rotate the dial knob until “4800” appears. Rotate the SEL knob again until menu #020,
“CAT/LIN/TUN” appears. Rotate the dial knob until “CAT” appears. Hold the FUNC key for one
second again to return to normal operation.
PAGE 3
8. Select the desired operating frequency and mode.
9. Push and hold the
TUNE
button on the front of the YT-100 for one second (until the
Tuning
LED
comes on), then release. The transceiver automatically switches to AM mode, and keys up with a
minimal amount of power, and the YT-100 begins a tuning cycle. At the end of the tuning cycle, the
original mode and power level is restored.
10. Wait for the tuning cycle to end; you’re now ready to operate!
SPECIFICATIONS
• 0.1 to 125 watts SSB and CW peak power, 100W on digital modes and 6 meters.
• Latching relays for ultra low power operation.
• 2,000 memories for instantaneous frequency and band changing.
• Powered from the radio -- no extra power supply to hook up.
• Designed specifically for the Yaesu FT-100/FT-100D/FT-857/FT-857D/FT-897/FT-897D
transceivers.
HF
• Pass-thru CAT port allows YT-100 to control the FT-xxx over the CAT bus while still allowing a
host PC to also control the radio.
• Pass-thru CAT port waits for idle CAT activity before controlling the transceiver.
• 1.8 to 54.0 MHz coverage. Frequency for memory storage is read from the radio via CAT.
• Tunes 4 to 800 ohm loads (16 to 150 on 6M), 16 to 3200 ohms with optional 4:1 Balun.
• For Dipoles, Verticals, Vees, Beams or any Coax Fed Antenna.
• Optional external Balun allows tuning of random length, long wire or ladder line fed antennas.
• Dimensions: 8.0”L x 7.6”W x 1.8”H.
• Weight: 1.5 pounds
AN IMPORTANT WORD ABOUT POWER LEVELS
The YT-100 is rated at 125 watts maximum power input
at most.
Many ham transmitters and
transceivers, and virtually all amplifiers, output well over 125 watts. Power levels that significantly
exceed specifications will definitely damage or destroy your YT-100. If your tuner fails during overload,
it could also damage your transmitter or transceiver. Be sure to observe the specified power limitations.
IMPORTANT SAFETY WARNING
Never install antennas or transmission lines over or near power lines. You can be seriously
injured or killed if any part of the antenna, support or transmission line touches a power line.
Always follow this antenna safety rule: the distance to the nearest power line should be at least
twice the length of the longest antenna, transmission line or support dimension.
PAGE 4
GETTING TO KNOW YOUR YT-100
Your YT-100 is a quality, precision instrument that will give you many years of outstanding service;
take a few minutes to get to know it.
The YT-100 is designed specifically for use with the FT-100/857/897. Tuning is performed when the
Tune
button is pushed on the front of the YT-100 and held for one second. The tuner can be placed in
bypass mode by pressing the
Tune
button momentarily.
The YT-100 is powered directly from the CAT port on the radio; no separate power supply is
needed. The YT-100 automatically powers up at the start of a tuning cycle, and goes into an ultra low-
power sleep mode when tuning is complete. The latching relays hold the tuned configuration
indefinitely, even when DC power is completely removed. Tuning memories are stored in FLASH
memory.
The YT-100 has 2,000 frequency memories. When tuning on or near a previously tuned frequency,
the YT-100 uses “Memory Tune” to recall the previous tuning parameters in a fraction of a second. If no
memorized settings are available, the tuner runs a full tuning cycle, storing the parameters for memory
recall on subsequent tuning cycles on that frequency. In this manner, the YT-100 “learns” as it is used,
adapting to the bands and frequencies as it goes.
Front Panel
On the front panel there is one pushbutton and one LED indicator light.
•
Tune Button:
Initiates either a memory tune or a full tune, and also toggles the tuner between
“active” and “bypass” modes.
•
Status LED:
Lights to give feedback on button presses, lights during tuning; gives tune status at
the end of a tuning cycle.
PAGE 5

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