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Afternoon all, I bought a RT-600 about 10 years ago. I could not get it to work. Send it back to LDG, they tested it as good, I got tired of messing with it and forgot about until recently. I have taken it out of the case. Powered it up. Cant seem to tell if any relays operate or not. Tried it into a dummy load and of course its not going to react to it. Hooked it up to several antennas and nothing. Tried it on Vertical, End Fed, Delta Loop all with appropriate Baluns. Nada. Best as I can figure it is not working. What would be the best way to test it? Or any other suggestions. Thanks 73 Bill W4WCS

I’ve been having issues with my LDG AT-Pro II auto tuner where, on some frequencies, it will initiate a full tuning cycle even if I have just completed a full cycle. This mostly occurs on 10m but I have seen it on 12m and 15m also. I’ve been in contact with LDG and expect to have a phone call with a tech this week. Test Setup FTdx10 LDG AT-Pro II Auto Tuner, connected with the correct coupling cable, running the V1.1 software which is the most current version. RigExpert Stick 230 Antscope iPad software W5GI antenna with the center about 60’ up a tree in an inverted Vee configuration, ends are about 10’ off the ground. The non-tuned SWR ranges from 4.6 to 3.7 from 28.0 to 29.0 Testing Methodology The FTDX-10 was set to 5w and AM mode. The LDG was set to a 1.7 SWR threshold and was in automatic mode. I ran through all the frequencies from 28.0 MHz to 29.0 MHz in 100kHz increments. At each frequency did the following steps: Long press the Tune button on the LDG tuner to initiate a manual tuning cycle. For frequencies above 28.300 I keyed the microphone to see if could transmit. At 28.3 I used USB and spoke into the microphone. I disconnected the antenna from the FTdx10 and connected it to the RigExpert, running a sweep from 28 MHz to 29 MHz I recorded the lowest SWR and it’s frequency. I moved the frequency line in AntScope to the tuned frequency, read off the SWR at that point, and recorded SWR Results Note: yellow boxes are where the desired frequency is above the SWR 1.7 threshold. Tuned f in MHz SWR @ f Min SWR Min SWR f 28.0 1.64 1.42 28.11 28.1 1.82 1.02 28.25 28.2 1.24 1.02 28.25 28.3 1.23 1.21 28.28 28.4 1.93 1.21 28.55 28.5 1.34 1.21 28.55 28.6 1.02 1.02 28.6 28.7 1.81 1.2 28.84 28.8 1.29 1.2 28.84 28.9 1.36 1.28 28.96 29.0 1.40 1.18 29.08 Anomalies At 28.300 I could not transmit, the tuner would go into an auto tune cycle, achieving an SWR of around 1.2. If I then tried to transmit again the auto-tune cycle would restart. I could put the tuner into semi-automatic mode and I could transmit, showing an SWR of around 1.2 on the FTdx10’s SWR meter. I was able to transmit at 28.4 MHz even though the RigExpert was showing an SWR higher than 1.7. The FTdx10s SWR meter showed an SWR between 1.5 and 2.0, it was impossible to tell the SWR with any greater precision. Graphical Data The plotted data can be seen at https://imgur.com/a/7TaxJoR I didn’t include there here because groups.io doesn’t allow images. Anyway, the data is much easier to see in the tabular form shown above. Is there anything else I can test before working with LDG? 73 N1PCZ

Is there any way to calibrate the MC-990 so the it matches the TS-990 meter? My TS-990 reads 10 over S9 the the LDG meter says 20 over S9. -Kurt, KR2C

It was functioning fine for months, but yesterday when I switched antennas, it's almost as if it blocks received signals from each antenna unless I bypass. Is there a reset?

Have a Z11 Pro II with my IC-7300. Using a 17' whip with coil on 20m today. Tuned it before chasing POTA. Upon sending audio, had it several times completely stop audio into radio. You can see the unit trying to tune while speaking. After dropping PTT, band and display are dead. They immediately come back when I hit Tune button. Is not an issue if I just depress PTT with no audio; only an issue when speaking. Any idea what's going on?

I've had my AT-1000ProII for 2-1/2 years so it's out of warranty and I'd sure appreciate some guidance on how I might debug and repair it. I think I may have damaged it while operating CW at 750W. I always try to stay within the specification maximum power limits but I often run right up to the limits. I have the tuner connected to a 315' end fed wire, 50' high, with a DG0SA design 1:9 unun that I've been using for over a year. My IC-7300 internal tuner tunes all ham frequencies with this antenna, 54MHz and down, as has my AT-1000ProII until recently. Now, sometimes when I key the transmitter the first time after a tune, both the LDG and the IC-7300 SWR meters peg to full scale or nearly so. It's an intermittent problem. There is no sound of relays when it happens (I'm running the LDG tuner in "semi-auto" mode) when the problem occurs, it persists at least until I re-tune. It's an intermittent problem and it may or may not occur again for a time after re-tuning. If I switch the AT-1000ProII to bypass, the 7300's internal tuner always works fine. More information: My other antenna input on the AT-1000ProII is connected to a 40m dipole at NVIS height (~10'-12'). 40m does not require a tuner, of course, but it's amazing how the LDG AT-1000ProII can tune most bands above 80m on that dipole and it never seems to exhibit the above problem of losing tune. Maybe it's because the problematic L or C value or L/C combination has just never come up when tuning the dipole, which only needs to be done when operating off of 40m but the match is typically far worse, pre-tune, than the 315' EF wire. I usually use the dipole for NVIS, which is best on 30, 40, and 80. The only reason I need my AT-1000ProII is for operations with my MercuryIIIS PA. I was operating CW on 40m at 750W when I first lost tune. Fortunately the protection in my MercIIIS worked! Now it's an intermittent problem and, for obvious reasons, I will not be running the MercuryIIIS with the AT-1000ProII until I can debug and repair the tuner. I attempted to use the AT-1000ProII manual tune buttons and display feature to find a bad component. The LDG manual says, "Capacitance value is displayed on the PWR bargraph, and inductance on the SWR bargraph." The manual appears to have it backwards! I found that the inductance buttons change the value displayed on the top "PWR" bargraph and capacitance is displayed on the bottom "SWR" bargraph. Regardless, I thought I was hot on the trail of a recalcitrant component when the problem corrected itself and I could not induce the loss of tune behavior again. It seemed to have "fixed itself" sometime after I toggled the Hi/Lo relay, but then toggling it back did not induce the failure. It is an intermittent problem and, unfortunately, it means that I will have to limit my use of my MercuryIIIS usage until I can debug and fix it. I've often thought that the problem might lie elsewhere, but it never happens when I'm using the 7300's internal tuner at the same power settings with the 1000ProII in bypass. BTW, it occurs at relatively low power--25W and maybe lower. (I've not tried lower.). Power doesn't seem to influence the problem. Thanks for any advice on how to proceed. 73, Cal AD8Q

I got a question ... I've read the manual and it's not clear to me .... I own a AT1000ProII tuner, I previous owned a 600 too. Wonderfull equipment. I?m wondering .... if you perform a "Full Tune" ... which stores those L and C settings according to the frequency into the memory ... "right" Do those settings get overwritten when you perform an occasional quick tune ? Why this question I explain ... I'm using a 6-band Cobweb antenna which resonance points shift down in frequency when the antenna gets wet in rain ... A lot of "full tunes" are done with the antenna completely dry en offcourse stored in the memory of the AT. If I want to use my antenna when wet I have todo a tune .... and now I'm wondering ... if I do an occasional quick tune ... will it overwrite it's full tune memory's. No I don't have water problems with my system ... it's just something Cobweb antenna's seem to do. Because the 100, 200, 600 and the 1000 have all the same interface ... this question offcourse relates to all those models. Thx 73 de ON1JV Jan

I’m trying to debug a “can’t tune parts of 10m” issue and I want to collect some baseline data. Is there a way to factory reset the LDG AT-200PRO-II? The manual is silent on that issue. 73 Paul N1PCZ

Where should the lightening arrestor be placed? Can/should it be placed on the biased feedline where the cable enters the house? Should it be placed between the antenna and the RT100 to protect the tuner? I appreciate any help.

What model as they all differ? Joseph D. Yuna Joseph D. Yuna (LCDR USN/ret.) W4JDY / EM79xr / ITU 8 / CQ 5 United States of America W4JDY1953@...

Just got this ATU to pair with IC-7300, a random wire (currently 29') and the 1:1 unun. I'm struggling with the ATU a bit and was hoping someone with 7300 experience might be able to direct me. Per 7300 manual, the internal tuner should be off. I haven't been able to get the Z-11 to automatically tune for me (I've checked that it's in Automatic Tuning Mode), I press its Tune button, it then tunes and the TUNE light on my 7300 comes on. If I turn it off, I sometimes completely lose reception. If TUNE can be on, can I use the TUNER button and hold for one sec like I do when using the internal tuner? Any idea why it won't auto tune? I've used PTT, TRANSMIT button the 7300 front....nothing seems to work. Any direction would be great. Thanks

Hello and I am hoping someone here may know the answer. I am using a Z-100A with an FT-891 and the 108 cable. I currently set the radio to CW or AM, 5w, then press and hold the TUNE button on the Z-100A down for about 4 second (until the red light goes out) and the tuner runs the tuning cycle and does its job. My question is, do I need to manually change mode to a constant carrier mode (e.g. CW) and decrease the output power to 5w to tune, or can I just activate the tuning cycle and the tuner will automatically do the appropriate mode and power change for me? The documentation doesn't explain this, just cautions about not tuning above 10w. I am curious if anyone has benched/tested this and figured it out. It would be nice if an automatic tuner did all of this, you know, automatically. 73 -Matt K1SP

Proper voltage being applied from transmitter but won’t tune 20 M and up. I tried removing power and restarting transmitter.

Hello , i'm working in a z817 tuner, and apparently the pic's firmware has a problem. the tunner don't do nothing at all. Start up, turn on the leds and nothing more. When i try to tune the relays don't work. and can't have a decent swr in any band. I wrote to ldg by they page whit no response. Have anyone here the firmware of this tuner? thank you

It's been a strange issue that I've been having for quite some time. I did send the tuner to LDG years back, but they found no issues. At certain power levels, I can hear a low frequency clicking noise. It sounds very mechanical in nature. I put my finger on every relay to see if I could feel any vibrations of one operating, but could not detect any vibrations. At what power level it occurs depends on what band I'm on. At lower frequencies, it happens at a lower power level. At higher frequencies it happens at a higher power level. If I increase the power level enough it will go away. It appears to be coming somewhere by the inductors, either the inductors themselves or the relays. It even happens in bypass mode. When I disconnect the DC power cable, the frequency increases, it becomes almost like a buzz. I've checked and have found no visible signs of arcing. There are no SWR fluctuations when it occurs.