I can't seem to find much.. actually none... activity regarding the LDG-1000.? I bought it used about 8 yrs. ago and have never really used it since then.? Not knowing a whole lot about tuners, Ive never really pursued it since my antenna had an acceptable SWR, as is.? However, I now have an ALS-600 solid state amp and it is VERY picky about SWR levels.? I've tried to use the LDG-1000 to improve my SWR but the amplifier isn't buying it.? The SWR is between 1.2 and about 1.5.? Which makes me the LDG-1000 isn't doing much.? The amplifier manual says you have to keep the SWR at about 1.2 -1, which is very low.? Am I wasting my time beating a dead horse.? With that I mean, is this really a usable tuner for an application like this or am I wasting my time messing with it.? Just to make sure I'm doing this right... I have my components connected, like this:

Transceiver antenna OUT is wired to the Ameritron ALS-600 amplifier IN
Amplifier OUT to my SWR meter IN? (this meter is probably redundant since the amplifier has an SWR meter also)
SWR meter OUT to the LDG-1000 IN
LDG-1000 OUT to the Transmitter side (port A) of my MFJ antenna switch box, with the selector switch set to "A".
On the Antenna side of the switch box, the antenna is connected to the "#1" port and the selector switch is set to the"1" position.

When I transmit, the ALS-600 amplifier faults due to high SWR...
When should I activate the LDG-1000 to correct the antenna SWR?? Does the amplifier also have to be powered up, prior to activating the LDG-1000 to correct the SWR?

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Well, sorry your 1000 isn't working for you. I have both the 1000 and the 600. My 600 is used with my ALS-600 amp. It does a great job matching my inverted L antenna on most bands (40-10). Sometimes I need to touch up the tuning by experimenting with the "L" and "C". Sometimes just a couple of button pushes gets the SWR below 1.5. The tuners aren't perfect but, for the most part, both of mine handle the matches very well.

I have the same configuration as you:? transceiver -->Amplifier-->SWR Meter-->LDG600-->Antenna. I send 10 watts into the tuner and hit the "Tune" button (Long press). I hear the relays doing their thing and once it stops I look at the SWR. If it isn't satisfactory I give the "L" and "C" a few clicks UP or DOWN.

My tuners are both "PRO2" models (LDG-1000ProII & LDG-600ProII). No idea what the difference is, but obviously something was improved.

It's also possible that the ALS600's SWR sensing circuit is defective. This is the perfect place to have a dummy load. I have the MFJ dummy load () that is like a paint can full of oil with a big non-inductive resistor inside.

Is it possible that your SWR meter isn't correct? I have had quite a few auto-tuners in the past and they can be really flaky at times. It really does sound like something just isn't right with your ALS-600. I did have one instance of failure with my ALS-600. I was transmitting through the tuner, which showed an excellent match, and when I boosted power to get 500 watts out, the amp's finals self-destructed. It was repaired under warranty fortunately. My ALS-600 seems perfectly happy with 1.5 and even as much as 1.7.

I suggest giving Ameritron a call. It doesn't cost anything and the people who answer the phone are very knowledgeable and helpful.?

Another thought... Do you have a between the antenna and the tuner? Often, it can make a difference. Weird things happen on the feedline coax when it attempts to be part of the antenna.

Good luck with it & 73, Doug -- K0DXV