LDG Z-817H, Operation Manual

Page 1: ...AGE 1 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 ldg...

Page 2: ...Installation 12 Hookup For Radios Other Than FT 817 12 Operation 12 Power up 12 Basic Tuning Operation Using With The FT 817 Radio 12 Toggle Bypass Mode 13 Initiate a Memory Tune Cycle 14 Force a Full...

Page 3: ...ing it serial commands The Z 817H 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 PKT mode transmit a carrier rea...

Page 4: ...nd changing Power 6V power supplied from long lasting internal AA alkaline batteries Designed specifically for the Yaesu FT 817 transceiver Will also work with non FT 817 radios but without automation...

Page 5: ...pecifications will definitely damage or destroy your Z 817H If your tuner fails during overload it could also damage your transmitter or transceiver Be sure to observe the specified power limitations...

Page 6: ...e tuned configuration indefinitely even when DC power is completely removed Tuning memories are stored in non volatile FLASH memory The Z 817H has 2 000 frequency memories When tuning on or near a pre...

Page 7: ...port is optional it is provided for those hams who would like to control their radio via computer This is a pass thru port to the RADIO port and is switched under software control by the Z 817H s mic...

Page 8: ...xternal balun is required The LDG RBA 4 1 or RBA 1 1 is ideal depending on the antenna and transmission line used Always turn your radio off before plugging or unplugging anything The radio may be dam...

Page 9: ...to be used ONLY with the following Yaesu transceivers FT 817 FT 817ND WARNING Do not attempt to use the Z 817H s radio interface cable with any other transceivers even if the CAT plug fits At best the...

Page 10: ...mmends that you connect your tuner to a suitable ground a common ground rod connected to buried radials is preferred but a single ground rod a cold water pipe or the screw that holds the cover on an A...

Page 11: ...rear of the Z 817H 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 Toky...

Page 12: ...s does not correct the situation try turning the radio off and back on again Basic Tuning Operation Using With The FT 817 Radio The Z 817H is operated from the front panel TUNE button on the Z 817H Tw...

Page 13: ...the Z 817H momentarily The Status 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...

Page 14: ...tuning is complete the transceiver will return to the operating mode and power level previously set Place the amplifier back in active mode and begin transmitting You will notice that the radio toggle...

Page 15: ...e the Z 817H to seek a better match than the match already stored in memory for this frequency To force a full tuning cycle first bypass the amplifier Then press and hold the Tune button on the front...

Page 16: ...t key the radio during tuning Tuning operation is the same as for tuning with an FT 817 except that you must key the radio manually during the entire tuning process CW or AM modes work best for tuning...

Page 17: ...ing cycle When the tuning cycle is complete control of the CAT interface is returned to the PC This procedure is completely automatic and is transparent to the user Simply hook up a PC and use the rig...

Page 18: ...d and maximum transfer of power from the transmitter to the antenna occurs While the transmitter output circuit and transmission line are of fixed carefully designed impedance the antenna presents 50...

Page 19: ...The LDG Electronics Z 817H automates this process No tuner will fix a bad antenna If the antenna is far from resonance the inefficiencies inherent in such operation are inescapable it s simple physic...

Page 20: ...e proportional to RF power These two voltages are read by the ADCs in the microprocessor and are used to compute SWR in real time The relays are a latching type and so they consume no current when not...

Page 21: ...ls just in case you lose this one When you are thinking about the purchase of other LDG products our website also has complete product specifications and photographs you can use to help make your purc...

Page 22: ...urate and complete 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 ca...