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I am just making absolutely sure from the Schematic.? Am I correct in saying that when the 2N7002 Mosfets are switched on that they supply the different relays with ground to actually switch the

To verify can you temporarily power the ATU100 via a battery and see it it still retunes? Mike N2MS

Good idea, but I should have said. The power is via a DC Tap over the coax. all well decoupled and as used on other ATU-100 installations without issues.

RF on the power supply line? I would wrap a couple of turns of the power lead through a 31 mix ferrite. Mike N2MS

I have an ATU-100 in auto mode, remotely mounted with a 4:1 balun for a Doublet. With 10 watts continuous carrier into the ATU it finds a 1.1:1 match and then about 5 seconds later retunes to the

Hello David,? yes fully understand now.? 73s? David? G4RVH

Hello Roger ,? well explained thankyou and never gave the capacitors a thought but yes fully agree now with the 1uF caps across all the relays. Thanks? 73s? David? G4RVH

In additional, diodes on the relays could rectify some powerful EMF cause opening relay.

Hi David, The ATU100 design uses a small capacitor across the relay coil to limit the back EMF. Many of these simple ATU schematics are very similar (The SGC/Icom/MFJ/LDG/mAT/ATU-100 are 90% the

Meant to send 2 photos73s david? G4RVHSent from Samsung Mobile on O2

Good Morning.? My name is David? G4RVH.I've been a radioham for over 40 years so have built my complete working radioham shack and all of the equipment homebrew ie transceivers and test gear.A

Thanks for the feedback ? 73 Em qua., 12 de jun. de 2024 11:36, Puneit Singh via groups.io <vu2tum= [email protected]> escreveu:

Thanks for letting us know Thanks Dave 2E0DMB [email protected]> wrote:

Dear All I changed the display and now the board is working fine. Since, I am missing the two buttons bypass and auto on the PCB, are these buttons needed - if yes, I can pull jumpers from under side

Hi there Puneit! Good news. Yes, as you have decided, the first thing to do is to change OLED Display. Since the relays are switching up and down it's a good indication that the firmware and

Dear Paulo While my board only has one button, I looked at the schematic and found the auto and bypass pins at 27, 26. I grounded these two pins and shorted the button using a jumper and then plugged

Try to set the unit to test mode ( press tune bypass an auto, all 3, simultaneously on power on), check the relay operation. That will let you confirm firmware an hardware functionality

Dear Dave, Yes, it is using the default display, i.e. 4E. The display driver I have is PCF8574T and as per the manual it's address is 4E, which is also default. Upon powering on, I do hear a click -

Hi have you programmed the pic to tell it what display it is using, as in the manual, Dave 2E0DMB [email protected]> wrote:

Hello All Last October, I purchased via Etsy ATU-100 mini from S51PV. It arrived and I turned it On, saw the unit was working and I put it in my drawer. It came in without a case and without antenna