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Table of Contents
Related Manuals for LDG Z-817H
Summary of Contents for LDG Z-817H
- Page 1 Z-817H OPERATIONS MANUAL MANUAL REV A LDG Z-817H 75-Watt Automatic Tuner for Yaesu FT-817 and Other QRP Radios with Amplifiers 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...
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Page 2: Table Of Contents
Table Of Contents Introduction Jump start, or “Real hams don’t read manuals!” Specifications An Important Word About Pow er Levels Important Safety Warning Getting to know your Z-817H Front Panel Rear Panel Installation Battery In stallation Compatible Transceivers Interface Cable... -
Page 3: Introduction
CAT (Computer Automated Transceiver) port on the back of the radio. The CAT interface allows an external device such as a PC or the Z-817H to control the FT-817 by sending it serial commands. The Z-817H takes advantage of this interface to simplify the tuning... -
Page 4: Specifications
11. Push and hold the TUNE button on the front of the Z-817H for one second (until the Status LED comes on), then release. The transceiver automatically switches to PKT mode, and keys up with a minimal amount of power, and the Z-817H begins a tuning cycle. At the end of the tuning cycle, the original mode and power level is restored. -
Page 5: An Important Word About Power Levels
AN IMPORTANT WORD ABOUT POWER LEVELS The Z-817H is rated at 75 watts maximum power input at most, when connected to an FT- 817 via the supplied CAT radio interface cable, and 50 watts maximum if not using the supplied CAT cable. -
Page 6: Getting To Know Your Z-817H
The Z-817H is designed specifically for use with the Yaesu FT-817 radio. Tuning is performed when the Tune button is pushed on the front of the Z-817H and held for one second. The tuner can be placed in bypass mode by pressing the Tune button momentarily. The Z-817H may also be used with other radios;... -
Page 7: Rear Panel
RADIO port, and is switched under software control by the Z-817H’s microprocessor. The firmware of the Z-817H has been written such that this will seem transparent to the user -- if using CAT to control your FT-817, just plug the PC’s CAT cable into this port instead of the CAT jack on the back of the transceiver. -
Page 8: Installation
INSTALLATION The Z-817H tuner is designed for indoor operation only; it is not water resistant. If you use it outdoors (Field Day, for example), you must protect it from the rain. The Z-817H is designed for use with coax-fed antennas. If use with longwires or ladder-line-fed antennas is desired, an external balun is required. -
Page 9: Compatible Transceivers
Now, install 4 AA alkaline batteries, being careful to observe correct polarity. Reinstall the lid, and reinstall the four screws to secure the lid. Never operate the Z-817H with the lid off, as hazardous and potentially lethal RF energy is present while transmitting. -
Page 10: Ft-817 Installation, No Amplifier
If using the FT-817 radio “barefoot” (no external amplifier), connect the ANT output of the FT-817 radio to the TX input on the rear of the Z-817H. Then connect the antenna feedline to the ANT jack on the Z-817H. Finally, connect the supplied CAT radio interface cable from the 8-pin mini-DIN jack marked “Radio”... -
Page 11: Ft-817 Installation, With Amplifier
If your amplifier interfaces directly with the FT-817’s ACC port, you may plug the amplifier’s interface cable into the PC port on the rear of the Z-817H. Amplifiers such as the Tokyo Hi-Power HL-45B use the ACC port to determine the radio’s band and also to send back ALC data to the radio. -
Page 12: Finishing Up Ft-817 Installation
Hookup For Radios Other Than FT-817 If using the Z-817H tuner with a radio other than a Yaesu FT-817, the hookup is the same as for use with the FT-817 (with or without amplifier), but the CAT radio interface cable is not used. -
Page 13: Toggle Bypass Mode
The tuner may also be placed in “bypass” mode where it is electrically removed from the antenna system. Toggle Bypass Mode To toggle between bypassed and active mode, press the front panel Tune button on the Z- 817H momentarily. The Status LED will flash three times to indicate that the tuner is in bypass mode. -
Page 14: Initiate A Memory Tune Cycle
To initiate a memory tuning cycle, first, bypass the amplifier. Next, press and hold the Tune button on the front of the Z-817H until the Status LED lights up. A memory tuning cycle will begin. The Z-817H will force the transceiver into PKT mode, and key the radio. When tuning is complete, the transceiver will return to the operating mode and power level previously set. -
Page 15: Force A Full Tune Cycle
In this case, forcing a full tune will cause the Z-817H to seek a better match than the match already stored in memory for this frequency. -
Page 16: Using The Z-817H With Other Radios
Using The Z-817H With Other Radios Although the Z-817H is designed to integrate seamlessly with the Yaesu FT-817 radio, it can also be used to tune other QRP radios with external amplifiers, so long as the maximum power output is kept under 50 watts. -
Page 17: Application Information
The Z-817H monitors the Computer port for activity before beginning any tuning cycle. Only when the CAT line is idle for a period of time will the Z-817H take over control of the CAT line in order to perform a tuning cycle. When the tuning cycle is complete, control of the CAT interface is returned to the PC. - Page 18 RF circuits also resist the flow of electricity. However, the presence of capacitive and inductive elements causes the voltage to lead or lag the current, respectively. In RF circuits, this resistance to the flow of electricity is called “impedance”, and can include all three elements: resistive, capacitive, and inductive.
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Page 19: The Ldg Z-817H
THE LDG Z-817H In 1995, LDG Electronics pioneered a new type of automatic antenna tuner. The LDG design uses banks of fixed capacitors and inductors, switched in and out of the circuit by relays under microprocessor control. An additional relay switches between high and low impedance ranges. A built-in SWR sensor provides feedback;... - Page 20 This allows the Z-817H to handle loads that are either greater than or less than 50 ohms. All relays are sized to carry 75 watts.
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Page 21: A Word About Tuning Etiquette
LDG products our website also has complete product specifications and photographs you can use to help make your purchase decision. Don’t forget the links to all of the quality LDG Dealers also ready to help you make that purchase decision. -
Page 22: Out Of Warranty Service
Ask your shipper for a tracking number or a delivery verification receipt. This way you know the product arrived safely at LDG. Be sure to give us your email address so our shipper can alert you online when your product is en-route back to you. Please be assured that our staff makes every effort to complete repairs ahead of our published wait time.
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