user manual.
Contents
1. real and imaginary parts It is beyond the scope of this manual to present a tutorial on this subject but a little background will help in understanding what the Z 100Plus 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 1826 In RF circuits an analogous but more complicated relationship exists 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 Capacitive Reactance Inductive Reactance Voltage Current Curren Voltage The output circuit of a transmitter consists of inductors and capacitors usually in a series parallel configuration called a pi network The transmission line can be thought of as a long string of capacitors and inductors in series parallel and the antenna is a kind of resonant 3 For a very complete treatment of this subject see any edition of the A RRL H andbook for Radio C ommunications previously the H andbook for Radio A mateurs PAGE 12 circuit At any given RF2. 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 TWO YEAR TRANSFERRABLE WARRANTY Your product is warranted against manufacturer defects in parts and labor for two full years from the date of purchase 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 two year watranty transfers to the new owner There is no need to complete a warranty card or to register an LDG product Your product purchase receipt establishes eligibility for warranty service so save the receipt Send a photocopy of the receipt with the product whenever you send your product to LDG for repair Products sent to LDG without a receipt are considered requests for out of warranty repair LDG does not warranty against product damage or abuse This means that a product failure as determined by LDG to be caused by the customer or by other natural calamity e g lightning is not covered under the two year warranty Damage can be caused by failure to heed the product s published limitations and specifications or by not following good Amateur practice PAGE 15 OUT OF WARRANTY SERVICE Any time a product fails after the warranty LDG wants to help you get it fixed Send the product to us for repair and we will determine what needs to
3. Tune button once the Tuning LED goes out A full tuning cycle will begin Tune SWA Tuning Press and held until Tuning LED lights SWR Tuning Cartinue holding Tune button until Taping LED extinguishes again mF Release Tune bution to begin Full Tune cycle PAGE 9 Status Indicators The SWR LED and Tuning LED are both used to indicate both operating modes tuning status and error codes The following table lists the LED status codes and their meaning LED Indication Meaning Tuning LED goes out Tuner has completed a tuning cycle SWR LED comes on solid a good SWR match was found Tuning LED goes out Tuning cycle is complete SWR LED blinks 5 times tuning match is between 1 5 and 3 0 SWR Tuning cycle is complete Hani LEG OES OU OO OR ED tuning match is greater than 3 0 1 SWR Tuning LED blinks 4 times Tuning cycle failed RF was lost in the middle of the tune Tuning LED blinks 5 times Tuning cycle failed no RF was detected APPLICATION INFORMATION Mobile Operation The Z 100Plus 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 The supplied radio interface cable is 14 inches long If it is desired that the Z 100Plus is positioned farther from the transceiver than this cable length allows a custom cable will need to be constructed This can be accompli
4. in SWR sensor provides feedback the microprocessor searches the capacitor and inductor 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 virtually any coax fed antenna The series inductors are switched in and out of the circuit and the parallel capacitors are switched to ground under microprocessor control The high low impedance relay switches the capacitor bank either to the transmitter side of the inductor bank or to the antenna side This allows the Z 100Plus to handle loads that are either greater than or less than 50 ohms All relays are sized to carry 125 watts continuously The SWR sensor is a variation of the Bruene circuit This SWR measuring technique is used in most dual meter and direct reading SWR meters Slight modifications were made to the circuit to provide voltages instead of currents for the analog to digital converters that provide signals proportional to the forward and reflected power levels The single lead primary through the center of the sensor transformer provides RF current sampling Diodes rectify the sample and provide a DC voltage 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 powe
5. 8 Sen KC EI SH An antenna tuner is a device used to ss el Gel el wel ees so TEG 1400 BI Aan Se 4 71 att cancel out the effects of antenna reactance mal meel 7 10 sel sool aas Tuners add capacitance to cancel out sf 2290 vaal 787 626 aal aas inductive reactance in the antenna and vice mal 1292 aas GER ven versa Simple tuners use variable capacitors szoa sl asaj al gei s22 and inductors the operator adjusts them by hand while observing reflected power on the SWR meter until a minimum SWR is reached The LDG Electronics Z 100Plus automates this PAGE 13 m 1182 BES 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 physics Much of the transmitted power may be dissipated in the tuner as heat never reaching the antenna at all A tuner simply fools the transmitter into behaving as though the antenna is resonant avoiding any damage that might otherwise be caused by high reflected power For best performance the antenna used should always be as close to resonance as is practical THE LDG Z 100PLUS 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
6. US Z 100PLUS OPERATIONS MANUAL MANUAL REV A LDG Z 100Plus 100 Watt Automatic Tuner ELECTRONICS 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 Table of Contents Introduction 3 Jumpstart or Real hams don t read manuals 3 Specifications 4 An Important Word About Power Levels 4 Important Safety Warning 4 Getting to know your Z 100Plus 5 Front Panel 5 Rear Panel 6 Installation 6 Operation 7 Basic Tuning Operation 7 Toggle Bypass Mode 8 Initiate a Memory Tune Cycle 9 Force a Full Tune Cycle 10 Status Indicators 11 Application Information 11 Mobile Operation 11 MARS CAP Coverage 12 Optional Internal Battery Installation 12 Icom Interfacing 12 Yaesu Interfacing 13 Theory of Operation 13 The LDG Z 100Plus 15 A Word About Tuning Etiquette 16 Care and Maintenance 16 Technical Support 16 Two Year Transferrable Warranty 16 Out Of Warranty Service 16 Product Feedback 17 PAGE 2 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 Z 100Plus 100 watt automatic tuner The Z 100Plus provides semi automatic antenna tuning across the entire HF spectrum plus 6
7. ace cable for powering the tuner connect the Z 100Plus to a source of DC power capable of providing 7 18 volts DC at 300 mA using the provided coaxial connector center positive You can use two standard 9 volt alkaline transistor radio batteries connected in series this is very handy for portable operation If your radio is powered by 12 VDC you most likely can use the same power supply for the Z 100Plus Grounding the Z 100Plus tuner will enhance its performance and safety LDG recommends 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 AC outlet can provide a serviceable ground LDG strongly recommends the use of a properly installed high quality lightning arrestor on all antenna cables PAGE 7 OPERATION Basic Tuning Operation The Z 100Plus is operated from the front panel TUNE button on the Z 100Plus itself Two types of tuning cycles are available a memory tuning cycle and a full tuning cycle The memory tuning cycle attempts to tune quickly based on having previously tuned on the present frequency selection If the tuner previously was successful in tuning on the currently selected frequency the settings for that match will be loaded into the tuner relays and checked to see that an acceptable SWR match is found A full tuning cycle starts from scratch and begins a fi
8. be avoided as much as possible The Z 100Plus s very short tuning cycle as little as a fraction of a second minimizes the impact of tuning transmissions CARE AND MAINTENANCE The Z 100Plus tuner is essentially maintenance free Power limits in this manual should be strictly adhered to The outer case may be cleaned as needed with a soft cloth slightly dampened with household cleaning solution As with any modern electronic device the Z 100Plus can be damaged by temperature extremes water impact or static discharge LDG strongly recommends the use of a good quality properly installed lightning arrestor in the antenna lead TECHNICAL SUPPORT The LDG Customer Support Center staff is ready to answer your product question by telephone and over the Internet We know that you will enjoy your product even more knowing LDG is ready to answer your questions as the need arises Visit the Support Center at http support ldgelectronics com Our website links you to the on line Customer Support Center where you can send us a question do your own research in the LDG Product Knowledge Books and read through lists of frequently asked product questions LDG regularly updates on line information so the best on line support information is available all day and every day The LDG website provides links to product manuals just in case you lose this one When you are thinking about the purchase of other LDG products our website also has complete product
9. be done Based on your prior instruction we will either contact you with an estimate or fix it and contact you with a request to pay any repair charges Please contact LDG if you have any questions before you send us an out of warranty product for repair RETURNING YOUR PRODUCT FOR SERVICE Returning a product to LDG is easy We do not require a return merchandise authorization Visit the Customer Support Center and download the LDG Product Repair Form On the Repair Form tell the LDG technicians exactly what happened or didn t happen and why you believe the product needs servicing The technician attempts to duplicate the problem s you had based on how well you describe it so take the time to be accurate 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 can alert you online when your product is en route back to you We regret that we are not able to provide periodic updates on the status of repairs Please be assured that our staff makes every effort to complete repairs ahead of our published wait time Your patience is appreciated Repairs can take six to eight weeks but are usually faster than this The most recent information on returning products for service is found at the LDG Customer Support Center Ship your carefully packaged repair with the Repair Form to LDG Electronics Inc Attn Repa
10. ergy is reflected the SWR increases to 2 3 or higher As a general rule modern solid state transmitters must operate with an SWR of 2 or less Tube exciters are somewhat more tolerant of high SWR If a 50 ohm antenna is resonant at the operating frequency it will show an SWR close to 1 However this is usually not the case operators often need to transmit at frequencies other than resonance sicher in a reactive antenna and a higher SWR FWD Power watts OE EIER IE es F Forward power ul sel wl el var vaal vaal 139 Wi l R Reflected power Am J ESI 1 83 1 58 153 1 50 AWR H d ol 342 62 aoe na vaal 1 75 trol ve UE aul Ia m E OV F SWR is measured using Zi SS e Ss GG a device called an SWR rel aa wel Tame an an set ales bridge inserted in the transmission line wl na sal Anal 325 2ar aal 2aal 230 220 between the transmitter and the antenna m sal aal as ais 283 202 2e aa i al This circuit measures forward and reflected aaz 2 06 2 00 262 24 ml 230 390 278 teg power from which SWR may be calculated 9p EE a i d es SEW 2 06 er some meters calculate SWR for you EI sei al am sal sm aoa More advanced units can measure forward 7 aal pel al aas aal 208 D i aal al al aas and reflected power simultaneously and uaj aus Ba anj ae asi 12 show these values and SWR at the same 1303 el a 470 mg Al 242 time iroa wel eel wel ol sel se 70
11. frequency each of these can exhibit resistance and impedance in the form of capacitive or inductive reactance Transmitters transmission lines antennas and impedance The output circuits of a transmitter the transmission line and the antenna all have a characteristic impedance For reasons beyond the scope of this document the standard impedance is nominally 50 ohms resistive with zero capacitive and zero inductive components When all three parts of the system have the same impedance the system is said to be matched 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 ohm non reactive load only at its natural resonant frequencies At other frequencies it will exhibit capacitive or inductive reactance causing it to have an impedance other than 50 ohms When the impedance of the antenna is different from that of the transmitter and transmission line a mismatch is said to exist In this case some of the RF energy from the transmitter is reflected from the antenna back down the transmission line and into the transmitter If this reflected energy is strong enough it can damage the transmitter s output circuits The ratio of transmitted to reflected energy is called the standing wave ratio or SWR An SWR of 1 sometimes written 1 1 indicates a perfect match As more en
12. from high SW R If it does not have a roll back droit limit power when tuning to 10 watts PAGE 3 SPECIFICATIONS 0 1 to 125 watts SSB CW and digital modes Latching relays for ultra low power operation 2 000 memories for instantaneous frequency and band changing 7 to 18 Volts DC 100 mA Virtually zero current when not tuning Optionally internal battery powered 7 18 VDC 1 8 to 54 0 MHz continuous frequency coverage Frequency for memory storage is determined by internal frequency counter Tunes 6 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 5 L x 5 W x 1 5 H Weight 1 0 pounds Includes 1 foot Icom and Yaesu 857 897 interface cable and foot coaxial cable jumper AN IMPORTANT WORD ABOUT POWER LEVELS The Z 100Plus 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 Z 100Plus 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 ser
13. he tuner is active This function may be useful if you wish to compare antenna performance with and without the benefit of the tuner s matching network SWR Tuning Momentary Press SWR Tuning 1 Blink Active SWR a Tuning 3 Blinks Bypass If a compatible Icom transceiver is connected via the interface cable the tuner may be operated from the tuner button on the Icom radio also PAGE 8 Initiate a Memory Tune Cycle To initiate a memory tuning cycle key the transmitter then press and hold the Tuning button on the front of the Z 100Plus until the Tuning LED lights up then release A memory tuning cycle will begin Tune SWR Tuning uh Press and hold until Tuning LED lighis SWR Tuning Release when Tuning LED lights to begin memory tune Force a Full Tune Cycle Sometimes if you are transmitting on a previously tuned frequency performing a memory recall tune will find a stored match that is acceptable but is not as optimal as could be This could be the case if you recently made modifications to your antenna for example In this case forcing a full tune will cause the Z 100Plus to seek a better match than the match already stored in memory for this frequency To force a full tuning cycle key the transmitter then press and hold the Tune button on the front panel of the Z 100Plus until the Tuning LED lights up and keep holding until the Tuning LED goes out again Release the
14. iousl injured or killed if any part of the antenna support or transmission line touches a powe line Always follow this antenna safety rule the distance to the nearest power line should b at least twice the length of the longest antenna transmission line or support dimension PAGE 4 GETTING TO KNOW YOUR Z 100PLUS Your Z 100Plus is a quality precision instrument that will give you many years of outstanding service take a few minutes to get to know it Tuning is performed when the Tune button is pushed on the front of the Z 100Plus and held for one second The tuner can be placed in bypass mode by pressing the Tune button momentarily Although a DC coax jack is supplied on the rear of the Z 100Plus the Z 100Plus may also be powered directly from internal AA or 9V batteries not supplied no separate power supply is needed The Z 100Plus 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 internal batteries should last for approximately one year under normal operating circumstances longer or shorter depending upon how frequently tuning is performed The Z 100Plus has 2 000 frequency memories When tuning on or near a previously tuned frequency the Z 100Plus uses Memory Tune to recall the previous t
15. ir Department 1445 Parran Rd St Leonard MD 20685 PRODUCT FEEDBACK We encourage product feedback Tell us what you really think of your LDG product In a card letter or email preferred tell us how you used the product and how well it worked in your application Send along a photo schematic or drawing to illustrate your narrative We like to share your comments with our staff our dealers and other customers at the LDG website http www ldgelectronics com PAGE 16 LE PAGE 17
16. 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 Z 100Plus may be optionally powered by internal batteries eliminating the need for an additional power cable to use the Z 100Plus Latching relays are used so the Z 100Plus consumes no power when not tuning so batteries only need to be replaced once per year or less JUMPSTART OR REAL HAMS DON T READ MANUALS Ok but at least read this one section before operating the Z 100Plus Turn off power to your radio Connect the antenna jack on the transceiver to the TX jack on the Z 100Plus using the supplied 50 ohm coax cable jumper Connect a 50 ohm coax antenna feedline to the ANT jack on the Z 100Plus Power up the transceiver and select the desired operating frequency Select AM FM CW or PKT mode and then key down to transmit a carrier Push and hold the TUNE button on the front of the Z 100Plus for one second until the Tuning LED comes on then release Wait for the tuning cycle to end red LED goes out 6 seconds and then un key Restore the transceiver to the desired operating mode You re ready to transmit Y ou can tune while transmitting up to 125 watts if your transceiver has a roll back drauit to protect it
17. om moving around inside the case For many installations simply fastening the battery pack to the top of the relays with double sided tape is sufficient Care should be taken not to splash solder onto the circuit board nor to leave any loose objects inside the case when re assembling the tuner PAGE 11 Icom Interfacing When interfacing the Z 100Plus with AH 3 and AH 4 compatible Icom radios IC 706 IC 7000 for example the Z 100Plus may be operated from the radio s TUNER CALL button Push the TUNER CALL button momentarily to toggle the bypass of the Z 100Plus Push and hold the TUNER CALL button for 2 seconds to initiate a memory tuning cycle Note that the TUNER button on the Icom IC 756 Pro series transceivers will not activate the Z 100Plus but pushing TUNE on the Z 100Plus will still automatically activate the carrier on the IC 756 Pro when using the Icom interface cable When using the IC 718 choose AH 4 from the tuner menu Yaesu Interfacing When interfacing the Z 100Plus with an FT 857 or FT 897 using the Y ACC cable the Tune button on the Z 100Plus is used to initiate a tune The Z 100Plus will automatically key the radio at the current power level during a tuning cycle and un key when the tuning cycle is complete THEORY OF OPERATION Some basic ideas about impedance The theory underlying antennas and transmission lines is fairly complex and in fact employs a mathematical notation called complex numbers that have
18. red by the 12VDC input provided by the DC coax jack or the optional internal batteries The relays are a latching type and so they consume no current when not actively switching Although the microprocessor s oscillator runs at 8 MHz which allows the main tuning routine to execute in only a few milliseconds the relays require several milliseconds of settling time for every combination of inductors and capacitors Thus it may take several seconds before all relay combinations are exhausted in the case of a difficult tune The tuning routine uses an algorithm to minimize the number of tuner adjustments The routine first de energizes the high low impedance relay if necessary and then individually steps through the inductors to find a coarse match With the best inductor selected the tuner then steps through the individual capacitors to find the best coarse match If no match is found the routine repeats the coarse tuning with the high low impedance relay energized The routine then fine tunes the inductors and capacitors The microprocessor runs a fine tune routine just after the tuner finds a match of 1 5 1 or less This fine tune routine now tries to adjust the SWR as low as possible not just to 1 5 it takes PAGE 14 about half a second to run 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
19. shed in two ways Cut the supplied cable and solder a jumper wire between all the connections or purchase new connectors and cable to construct a custom length interface cable from scratch The connectors are standard 1 8 stereo plugs available from most electronic supply catalogs such as Mouser Electronics The female jack is Mouser part Tip Sleeve Mouser PrN 17PP004 EX puser PrN 16PJ106 EX number 16PJ106 EX and the male plug is Mouser part number 17PPO04 EX PAGE 10 MARS CAP Coverage The Z 100Plus provides continuous tuning coverage over its specified range not just in the ham bands This makes it useful for MARS or CAP operation or any other legal HF operation Optional Internal Battery Installation The Z 100Plus is designed to allow the user to install his own internal battery pack The internal battery must be between 7 and 18V DC A single 9V battery or a 6 or 8 cell AA or AAA battery holder with batteries installed In order to install an internal battery supply the lid of the Z 100Plus must be removed by first removing the four screws on the side of the case Connection of the battery pack to the Z 100Plus is made via the two battery solder pads at J8 and J9 J8 is the negative terminal and J9 is the positive terminal Solder a pair of 20AWG or smaller wires to the solder pads at J8 and J9 being careful to observe the polarity of the connections The battery pack should be secured to prevent it fr
20. stant If you use it outdoors Field Day for example you must protect it from the rain The Z 100Plus is designed for use with coax fed antennas If use with longwires or ladder line fed antennas is desired an external 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 damaged if cables are connected or disconnected while the power is on Connect the HF antenna jack on the transceiver to the Transmitter jack on the back of the Z 100Plus using the supplied coax jumper cable or a similar 50 ohm coax cable rated 125 watts or greater The Z 100Plus can interface directly with several popular transceivers For Icom radios it will enable their Tune button to start a tuning cycle and provide power to the tuner For Icom radios that are AH 3 or AH 4 compatible connect the white Molex connector into the radio s tuner port The power and radio plugs then connect to the tuner The tuning process can start by either pressing the tune button on the tuner or the radio For Yaesu FT 897 and 857 use the Y ACC cable and plug the red end marked Radio into the radio s ACC port Connect the black end marked Tuner into the tuner s interface jack The radio does not supply power to the tuner The tune button on the tuner is used for starting the tuning process If you are not using an Icom interf
21. uning 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 Z 100Plus learns as it is used adapting to the bands and frequencies as it goes Front Panel 7 100Plus Automaa On the front panel there is one pushbutton and two LED indicator lights Tune Button 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 Tuning LED Lights during tuning operation will also blink error codes if a good tuning match is not found PAGE 5 Rear Panel Power Radio Interface The rear panel of the Z 100Plus features five connectors Antenna connector Connect the 50 ohm coax antenna feedline to this standard SO 239 connector GND connector wing nut Connect to antenna system ground Transmitter connector Connect the 50 ohm coax jumper cable from this standard SO 239 connector to the ANT jack on the back of the transceiver Power jack 2 5x5 5mm DC coaxial jack Connect to 7 to 18VDC center positive Radio Interface jack Connects via a control cable to a compatible transceiver PAGE 6 INSTALLATION The Z 100Plus tuner is designed for indoor operation only it is not water resi
22. xed tuning sequence where the Z 100Plus rapidly tries varying combinations of inductance and capacitance values and then zeroes in on the best match possible When the tuning cycle is complete if an acceptable match was found the inductance and capacitance settings are saved in a memory associated with the selected frequency so that they may be recalled quickly in the future via a memory tuning cycle In this manner the Z 100Plus 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 In both cases at the end of the tuning cycle the carrier is held for 1 5 seconds after tuning is complete so that the final SWR may be read on the transceiver s internal SWR meter or another inline SWR meter and the front panel LEDs will indicate the status of the tuning cycle 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 100Plus momentarily The SWR LED will flash three to indicate that the tuner is in bypass mode Press the front panel Tune button momentarily again to recall the previous tuner settings The Tuning LED will flash once to indicate that t
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