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- Page 1 Z-817 OPERATIONS MANUAL MANUAL REV A LDG Z-817 20-Watt Automatic Tuner with FT-817 Integration 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 Jumpstart, or “Real hams don’t read manuals!” Specifications Getting to know your Z-817 Front Panel Rear Panel Installation FT-817 Installation Non-FT-817 Installation Grounding Operation Basic Tuning Operation Toggle Bypass Mode: Initiate a Memory Tune Cycle: Force a Full Tune Cycle:... -
Page 3: Introduction
1. Turn off power to your FT-817 radio. 2. Connect the rear antenna jack on the transceiver to the “TX” jack on the Z-817, using a 50 ohm coax cable jumper. 3. Connect a 50 ohm coax antenna feedline to the “ANT” jack on the Z-817. -
Page 4: Specifications
8. Push and hold the TUNE button on the front of the Z-817 for one second (until the Tuning LED comes on), then release. The transceiver automatically switches to PKT mode, and keys up with a minimal amount of power, and the Z-817 begins a tuning cycle. At the end of the tuning cycle, the original mode and power level is restored. -
Page 5: Getting To Know Your Z-817
The Z-817 is designed especially for use with the FT-817. Tuning is performed when the Tune button is pushed on the front of the Z-817 and held for one second. The tuner can be placed in bypass mode by pressing the Tune button momentarily. -
Page 6: Front Panel
Front Panel On the front panel there is one pushbutton and two LED indicator lights. • Tune: Initiates either a memory tune or a full tune, and also toggles the tuner between “active” and “bypass” modes. • SWR LED: Lights steady green at the end of a tuning cycle to indicate a good match has been found. -
Page 7: Rear Panel
Radio port, and is switched under software control by the Z-817’s microprocessor. The firmware of the Z-817 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 FT-817. -
Page 8: Installation
Connect the rear antenna jack on the FT-817 to the TX jack on the back of the Z-817, using a 50 ohm coax cable rated 20 watts or greater. -
Page 9: Grounding
In this manner, the Z-817 “learns”; the longer you use it, the more closely it adapts itself to the bands and frequencies used. Most users will probably use memory tuning most of the time; it takes advantage of any saved tuning settings, but automatically defaults to a full tuning cycle if no stored data is available. -
Page 10: Toggle Bypass Mode
Toggle Bypass Mode: To toggle between bypassed and active mode, press the front panel Tune button on the Z-817 momentarily. The SWR LED will flash three times to indicate that the tuner is in bypass mode. Press the front panel Tune button momentarily again to recall the previous tuner settings. The SWR LED will flash once to indicate that the tuner is no longer bypassed. -
Page 11: Initiate A Memory Tune Cycle
Initiate a Memory Tune Cycle: To initiate a memory tuning cycle, press and hold the Tuning button on the front of the Z-817 until the Tuning LED lights up. A memory tuning cycle will begin. The Z-817 will force the FT-817 into PKT mode, change the power level to one that is appropriate for tuning, and key the radio. -
Page 12: Force A Full Tune Cycle
In this case, forcing a full tune will cause the Z-817 to seek a better match than the match already stored in memory for this frequency. -
Page 13: Status Indicators
The only requirement is that the tuner remain dry. The supplied radio interface cable is 14 inches long. If it is desired that the Z-817 is positioned farther from the transceiver than this cable length allows, a custom cable will need to be constructed. -
Page 14: Mars/Cap Coverage
The Z-817 monitors the Computer port for activity before beginning any tuning activity. Only when the CAT line is idle for a period of time will the Z-817 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 15: Theory Of Operation
, but a little background will help in understanding what the Z-817 is doing, and how it does it. In simple DC circuits, the wire resists current flow, converting some of it into heat. The relationship between voltage, current, and resistance is described by the elegant and well-known “Ohm’s Law”, named for Georg Simon Ohm of Germany, who first discovered the principle in... - Page 16 SWR meter until a minimum SWR is reached. The LDG Electronics Z-817 automates this process. No tuner will fix a bad antenna. If the antenna is far from resonance, the...
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Page 17: The Ldg Z-817
This allows the Z-817 to handle loads that are either greater than or less than 50 ohms. All relays are sized to carry 20 watts continuously. -
Page 18: Care And Maintenance
The Z-817 is powered by four 1.5V AA alkaline batteries, which are located inside the tuner. If tuning operation becomes erratic, or the Z-817 fails to operate at all, it is likely due to low batteries. Battery life is expected to be approximately one year for alkaline cells under normal use. More frequent use, or use of batteries other than alkaline cells may yield somewhat shorter battery life. - Page 19 Now, turn the Z-817 over again and lift off the lid. Inside you will see a four-cell AA battery holder. Remove the four AA batteries, and replace them with fresh ones of the alkaline or lithium type. Be sure to observe the polarity markings on the battery holder.
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Page 20: Technical Support
This two-year warranty is also transferable. When you sell or give away your LDG product give the new owner a copy of the original sales receipt and the remainder of the two-year warranty goes with the new owner. -
Page 21: 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. Periodic updates on the status of the repair are not available. - Page 22 Built-in CAT port interface. CAT thru port for not be simpler; one button push on the tuner is all computer connection. that is needed and the Z-817 takes care of the rest. 2000 memories when used with FT-817 It will switch to PKT mode, transmit a carrier, tune...
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