Hello! Happy New Year!

is my attempt to add the TQFP-44 sitting option around the original UQFN-40 pads.
Also - I cleared as much ground near the Tandem Match as possible. If you want the on-board BNCs - there it is with its' rear panel. I prefer the off-board BNCs sitting perpendicularly on the rear board itself - there is such a PCB variant as well.

Thanks Fred. 73

Norm,

My ATU-100 was bought as a kit.? The relays supplied are on eBay. The number on them is "HRS1H-S-DC12V" which gives plenty of hits.

vk3pe

Howdy
I think I am missing something..i have a Chinese unit and the 4 line oled.? I know about vcc and ground.? What are the two other lines and where do they go ?
And how do you program it or set flags in the OS?
The schmatic really doesn't show the oled board.
Thanks in advance
Ralph

Finally putting together another ATU-100 kit I got a while ago only to end up one relay short. Looked up the part number on both DigiKey and Mouser with no joy. Anyone have a part number for me? ?Thanks?
73

I am interested in the ATU-10, especially since David has added connections for manual tweak buttons.? But I would want an assembled board (not being up to SMD soldering) and am concerned about the past issues of build quality from vendors.? I want to install this unit at the antenna (in a waterproof housing), which means that it will be subject to varying temperatures.

I would be willing to pay a bit more to get a unit in which I can have confidence.? Has anyone contemplated a "group buy" where we would hire a suitable shop to do a careful job building some units?

thanks,

Steve

I have an ATU-100 board that I bought pre-assembled,? Worked fine, then suddenly in mid-operation the power supply fuse blew.? I now find that the 12 volt power line is shorted to ground.? I removed the regulator and 5 electrolytics; it's still shorted.? Any ideas?

thanks and happy new year!

Steve

Hi Dave

Perhaps it would be a good idea to let the tuner work in auto mode to start with and make a note of the L and C values determined by the ATU. Then switch to manual mode and use these values as a starting point.?

I find adjusting the values of L and C manually in Test mode slow and tedious (compared to a traditional ATU with a variable capacitor) I think lots of adjustment with values way off the mark while transmitting will stress the PA,(and possibly the ATU capacitors if using higher power), particularly if it is a simple radio with no protection such as the QCX or QDX.

Certainly an interesting exercise though Dave

73 Steve G4EDG

With the unit in simple "Test Mode", I am experimenting with manual operation - so, basically to perform the tuning the same as the Autotune function, but doing it manually.?

However, I'm not sure about the correct sequence of steps to do this - but here's the steps I am performing currently for use with my FT8 Software (WSJT-X):

1) Power up the tuner in Test Mode and set values of C and L to zero;?
2) Activate "Tune" function of the software to transmit RF input signal to the tuner;
3) Increase C value one step, note the effect (if any) on SWR;
4) If SWR decreases, continue to increase C value until SWR is minimum; if SWR does not decrease, then increase L value in similar way to get minimum SWR;
5) Repeat the steps 3 and 4 again to minimize SWR after each time C or L is adjusted - do a "fine tune" essentially;
6) Once minimum SWR is achieved, "long press" the "TUNE" button to change the filter configuration and repeat the above process - best SWR result will determine which configuration is preferable.
7) Deactivate the "Tune" Function.? The tuner is now set for the current operating frequency.

Does this sound correct ?? I am not trying to reverse engineer the operating program - only to understand it...? ? ? ?:-)

Any comments, suggestions or or improvements to my process listed above will be greatly appreciated - Thanks.

73,?

Dave KG7WOC

.....and I have Glenn's V1.3 boards (about 10) available in the USA for $5 postpaid in the USA.

73 Kees K5BCQ

开云体育

OK Luca

Good luck with the project.

Glenn

vk3pe

Hi Glenn,

thanks for your very detailed answer
!
I have purchased two evaluation boards at mouser. I have seen that only few are still available.
Have a nice 2022
Luca

Luca
I take it you are building one of N7DDC's original PCB's??? That part is in very short supply as you have found. I don't know where you might find them.

Mouser (Cat # 579-DM164142 ) have an evaluation board which contains the part if you cannot find one anywhere else. You would have to remove the chip from the Eval board and solder it to an original design ATU-10 PCB.
Farnell have the Eval PCB also cat # DM164142

The shortage of this part is the reason I re-designed N7DDC's PCB to use the easier to find larger footprint parts. ie PIC16F18877-I/PT or -E/PT? plus the smaller part PIC16F1454-I/SL or -E/SL.
I understand Kees still has some of the 'new' PCB's, designated Version 1.3x. It also uses 0805 parts instead of 0603.. See also
(V1.2 of my board uses the larger footprint devices as above but still uses 0603 parts of the caps and resistors, like N7DDC original.)

The larger footprint PIC's seem to be in reasonable supply.? eg Digikey PIC16F18877-E/PT-ND but they don't have the SOIC version of the PIC16F1454
Mouser have the PIC16F18877 Cat # 579-PIC16F18877-I/PT and the PIC16F1454 Cat # 579-PIC16F1454T-I/SL
I don't know distributors in other countries so you would have to check if you wish to go with a new pcb.

Farnell only have the PIC16F1454-I/SL in stock Cat #2305810

Please double check any numbers I have given above, if you purchase.

If you cannot get the part, and don't wish to buy my version of the PCB, I have one PIC16F1877-I/MV here which I may part with at cost plus postage.? I bought this part from Farnell some time ago, Cat # 3577783. Please treat this offer as a last resort as the rules have changed here for merchandise postage and it's onerous for me now to post anything overseas.

Glenn
vk3pe

Hi, i ask if someone knows where it is possible to purchase?PIC16F18877-E/MV for ATU-10.

That's great - thank you for this awesome tuner !

73,

Dave KG7WOC

Hi, Dave

Hi - I have a question about the displayed data -

With the unit in "Test Mode", the display shows "SWR" and a power value - is this value the power measured at the input to the tuner, or the output from the tuner to the antenna ?

Thanks -?
Dave KG7WOC