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An interesting document, Mr n0ywb. Do you have one where the Icom interface legends are readable ?. I can only see blobs and blurs. A higher resolution copy would be useful. 73 Mike G8NXD

Paul 1. on the ATU press one of the buttons which puts a fullstop at the end of the first line on the screen - Make sure there is no underscore which will put in the bypass mode 2. Turn the

underscore is bypass, so no caps or coils connected. dot is autotune, tunes if swr gets too large. 73 Ton PA0ARR

i am not quite getting this,So if after a good tuning cycle do i have to put it into the mode showing the underscore for it to keep using the combination of coils and caps used for a match,ie will it

Paul Please read thoroughly the pdf I sent you yesterday from page 6 onwards 73 Tony VK2IC

Well i found some more buttons and fitted with 100nf caps to ground,now i can get a period or underscore displayed,thing is what are those modes and how do i use them?,sorry for all the silly

Outputs RA6 and RA7 complement each other -when one is low the other is high. RA6 is asserted low to key the transceiver.? Input "B" (start button, or asserted low by the transceiver) starts the

Is there a period (dot) on the screen? Maybe you have gotten it into Auto mode... And you might try unsoldering those antennas on B1 and B2. What happens if you run, say, 10 watts into it? Good luck!

I have had none of these problems with any of the ATUs I’ve got 2x 100 and 1 100 modified for qrp, 2 ?ought in and one built from a kit. M0DZO

Paul There is no easy answer to your questions.?? Diagnosing problems remotely is difficult at best. vk3pe

Paul *A7* goes high when tuning.? Then falls back to logic '0' (gnd potential) *A6* is the inverse. vk3pe Paul A7 goes high when tuning.? Then falls back to logic '0' (gnd potential) vk3pe

is nobody going to give me an answer to this then??,73 m3vuv.

Sorry, who said anything about a cheap ATU?? And buying boards and various parts to follow the instructions that are available for an AMP Build isn't difficult.? I don't see any instructions or

Why would you risk a very expensive amp with a cheap ATU? I fail to see the logic. If you have the capability to make a 2.5kw amp, I would have thought you would have the capability to make an ATU.

You'll need to respin the PWB to increase separation between critical traces. Plan to use vacuum relays and capacitors with at least 7.5 kV ratings for safety margin. You're essentially looking at

Yes, but I am trying to build one that is 2500watts.. My new amp will be around 2.5kw... :-(

hi John, I found kits ATU1000 … great chinese distributor… look at google or amazon! 73 Immo

Hi, I am in the process of building a 2.5kw PEP amplifier (legal limit here in Canada).? I am desperately looking for a way to build an automatic antenna tunder into it and stumbled across N7DDC

The bypass caps need to be on the board. Otherwise, there is no point to adding them, as the switch wires are essentially antennas. Al

yes that should be ok - 73 Tony