Nothing wrong with the tuner I think, just not enough ground pole.?
Try to Google "artificial RF ground system".
Or, add that length of coaxial with the better results, can control it with VNA.
Couple meters off fider in additional can change everything dramatically.

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well that is not what i had thought.

thanks dave

Hi. Ic 705 tuner connection.?
One pin is the tuning request from TRX
Second pin is the CW request from tuner
According to well known icom tuner protocol.

I'm using a ATU200 ATU, that can operate up to 150 W and uses a weather proof case.

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(

?)

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I've mounted the unit with a coaxial connector output. Not as it is on the kit.

I've been trying to fix my unit for the last three weeks with no success.

I decide to rewind the tandem transformer and replace the diodes, as may people say to do ( changes to 1N5711). My antenna is on top of an apartment building, a random wire with the sequence of a 1:1 choke balun and a 9:1 unun.

I've tested the antenna with nanoVNA close to it. All Z values were ok for the ATU-100.

My problem is: if my ATU ( my version is weather proof and can be installed outside close to antenna), With the ATU on 14th floor and 38 m of RGC213 the tuning is almost perfect for all bands from 80 to 10 m, with an exception (1.8:1) on 20 m.

But, when it seats close to the balun/unun with a short (1.5 m of coaxial cable), the ATU is totally unreliable. It's useless! : ( Sometimes the unit enter on an infinite loop an never find the good combination.
The case where it is mounted is plastic made bud shielded on internal side with copper foil adhesive tape.

I'm giving up to use it close to the antenna!

I'm lost.

Anybody have an idea of what is going on??

as the heading says a bought an atu-10.? it has a connector on the back that is labeled "ext".? any idea what this is for?

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Unconnected antenna socket grounds sounds odd, Paul. Did it come in a metal case?

Attached is my firmware as brought from china,Let me explaine i built the tuner but it did not react to rf,on taking it apart i discovered that the antenna socket grounds were not connected to the pcb ground,Would that cause it not to respond to rf?,attached is the hex after a read,is it ok?,many thanks Paul m3vuv.

Great job! Finally got a PicKit3 to give this a try, it works a treat!

ATU-100??? EXT board?
by N7DDC??? FW ver 3.2?
?????? ???? ???????????
PWR=0.0W.L=0.45u??? SWR=0.00 C= 147p?
PWR=0.0W.L=0.45u??? SWR=0.00 C= 147p?

First test has been done with an USB/Serial TTL converter. I'll hook up a RS485 converter these days.

73 OE6HKE

Hi Rob,
Watch out for L1, as some boards have smaller diameter holes for L1, so you can only fit the 0.5mm wire.
I'd also look at using the -6 toroids as they are 55MHz rated (but you'll need to change the number of turns to get the same inductance).

Hi all, this is great. I also have no PIC experience but now I feel like I can get hacking on it when I have some time free. It seems like the ideal target would be a common (serial or i2c) protocol for requesting information (current relay status and match readings) and sending commands. If that is established and documented it would allow anyone to interface to the ATU and add whatever functionality they like.

Hi Tom,

Great work....
I've been messing with hardware and base code to add frequency and memories, which takes this towards a consumer tuner.
But there are a lot of "standard" boards out there that people won't want to (or can't) upgrade.

Looking at your WAG section, got me thinking about options for memories without using frequency.

I wondered about a way to "fingerprint" settings that have been found, maybe using the SWR for the first few steps of the tune.
Using 48-bits per entry (3x11-bit SWR, 2x7-bit relay + CSW) there is enough space for 32 entries in the EEPROM, or 1000s in the program space.
So after the first 3 steps of the tune, it could scan the No-So-WAG table for close matches to the 3x SWRs, then try a few inductor/capacitor relay settings from there.
These have previously been found to be good, so if the antenna hasn't significantly changed, and it's been tuned before, then this should find good settings in a few relay switches.

What do you think?

Hi Edson,

When establishing serial communication I'll not use LCD, but I find it useful to be able to connect the LCD while doing tests with arduino.

If you prefer to try it with your code, for my part it would be enough with 16x2 or 20x4 LCD support. (I hate OLED screens).

I thank you again your support, and while I wait for your news I'll be entertained with arduino code.

73 Germán.

Hello German,

??? Yes, I deleted some routines on the code, including the I2C/LCD sending functions.

??? That was because the original code isn't very well organized and while doing the modifications I was cleaning it from things that wasn't essential (to the remote operation) so that I could better understand the really important stuff.

??? I can try to insert the serial communication on WA1RCT code. I understand that having a code that can do everything the standard firmware does plus serial communication would be very nice.

??? I'll see what I can do this weekend.

??? 73

Rob, if it is 1mm you can leave it?

Thanks Edson for your comments and support.

Arduino seems easier for me because there is much more information and code with examples of what I intend to do.

I am testing your code with MPLAB, and I see that you have suppressed the support to the LCD screen and use the RB1 (Pin 22) and RB2 (Pin 23) that correspond to the Bypass and Auto buttons. Have you suppressed these buttons?

In the sources of David WA1RCT it has support for the LCD screen and uses the RA6 and RA7 ports for TX/RX, but it seems that it is not fully implemented because it gives me UART error in the compilation.

You could tell me how I can have LCD support and establish serial communication for pins 9 and 10 (RA7 - RA6).

73

Enamelled copper wire, so called because its early application was to wind electro-magnets.

Nuno, you can try this

Roger, I don't believe in that, because I faced in simple BPF when air core coils with simple 1mm magnet wire became very hot on 50 MHZ. Yaesu used silvered 2mm wire for that .?
But you can try the mix #6.