- DL manuals
- LDG
- Tuner
- Z-817H
- Operation Manual
LDG Z-817H Operation Manual
Summary of Z-817H
Page 1
Z-817h operations manual manual rev a page 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@ldgelectronics.Com www.Ldgelectronics.Com.
Page 2: Table Of Contents
Page 2 table of contents introduction 3 jump start, or “real hams don’t read manuals!” 3 specifications 4 an important word about pow er levels 5 important safety warning 5 getting to know your z-817h 6 front panel 6 rear panel 7 installation 8 battery in stallation 8 compatible transceivers 9 inter...
Page 3
Page 3 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 ...
Page 4
Page 4 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 ...
Page 5
Page 5 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. Many ham transmitters and transceivers, and virtually all amplif...
Page 6
Page 6 getting to know your z-817h your z-817h is a quality, precision instrument that will give you many years of outstanding service; take a few minutes to get to know it. The z-817h is designed specifically for use with the yaesu ft-817 radio. Tuning is performed when the tune button is pushed on...
Page 7
Page 7 rear panel the rear panel of the z-817h features five connectors. • ant connector: connect a 50-ohm coax antenna feedline to this standard so-239 connector. • gnd connector (wing nut): connect to antenna system ground. • tx connector: connect a 50-ohm coax jumper cable from this standard so-2...
Page 8
Page 8 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 desir...
Page 9
Page 9 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. Compatible transceivers ...
Page 10
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 inter...
Page 11
Page 11 ft-817 installation, with amplifier connect the antenna jack on the ft-817 to the tx or input jack on the back of the external amplifier, using a 50 ohm coax jumper cable. Connect the ant or output jack on the amplifier to the tx jack on the rear of the z- 817h with a coax jumper. Connect th...
Page 12
Page 12 finishing up ft-817 installation if it is desired to operate the ft-817 via computer control, connect a yaesu ct-62 cable (not supplied) to the jack on the z-817h marked “ pc ”. The z-817h will automatically feed through any cat commands coming in over this port to the transceiver and vice v...
Page 13
Page 13 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 tune...
Page 14
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 radi...
Page 15
Page 15 force a full tune cycle sometimes, if you are transmitting on a previously tuned frequency, but something has slightly changed in your antenna system (maybe the antenna was re-oriented, for example), performing a memory recall tune will find a stored match that is acceptable, but is not as o...
Page 16
Page 16 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. Additionally, because there is no frequen...
Page 17
Page 17 application information mobile operation the z-817h is perfectly suited to mobile operation. It can be installed under the dashboard along with the transceiver, or mounted remotely. The only requirement is that the tuner remains dry. Mars/cap coverage the z-817h provides continuous tuning co...
Page 18
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: resis...
Page 19
Page 19 where f = forward power (watts), r = reflected power (watts) swr is measured using a device called an “swr bridge”, inserted in the transmission line between the transmitter and the antenna. This circuit measures forward and reflected power from which swr may be calculated (some meters calcu...
Page 20
Page 20 banks, seeking the lowest possible swr. The tuner is a “switched l” network, consisting of series inductors and parallel capacitors. Ldg chose the l network for its minimum number of parts and its ability to tune unbalanced loads, such as coax-fed dipoles, verticals, yagis, and, in fact, vir...
Page 21
Page 21 a word about tuning etiquette be sure to use a vacant frequency when tuning. With today’s crowded ham bands, this is often difficult. However, causing interference to other hams should be avoided as much as possible. The z-817h’s very short tuning cycle minimizes the impact of tuning transmi...
Page 22
Page 22 out of warranty service if a product fails after the warranty period, ldg wants to help you get it fixed. Send the product to us for repair any time you like. We will determine what needs to be done and based on your instructions, either contact you with an estimate or fix it and contact you...