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Hi David, With the ATU in bypass, does the meter show a PWR/SWR reading when you transmit? If not, then check that injecting a DC voltage on the Stockton bridge diode D2 (Cathode) shows a reading on

Hi David. So today finally got round to applying RF into the input and a 50 watts Dummy Load on the Ant Output. With 10 watts out of my known transceiver absolutely Zilch nothing and no relays

Good Morning David? ?G8PTN Thanks for you kind words. But it sounds like you and I are alike in this radioham hobby,? a labour of love.? Also have the MFJ258 for very quick checking. I have

Hi David, I am more than happy to help out where possible and hopefully the ATU-100 will work when you put RF through it. Yes, the enclosures can also take some time. I tend to use the old school

Hi David? G8PTN You have been very useful guiding me through my difficulties and most grateful of your valuable help. My ATU was not a kit as you know so had to source all of the parts.? The Chip

Hi David? G8PTN. Sim Smith is good to get the matching to be nearer enough. I put my NanoVna onto the ATU tonight actually just to make sure that I could actually see the L's & C's altering the

Hi Dave? G8PTN Attached video of both banks of Relays. Watch the Bottom Middle S8 led go out switching relay banks from L to C. 73s Dave? ?G4RVH

Hi David, Excellent news that all is now working okay. It’s probably easier just to go for an RF test with 5 ~ 10W. I would initially put the ATU in bypass with a 50? dummy load and check that the

I Dave? G8PTN Just had a thought.? I will test that the Inductance and Capacitance will tune the 50 ohms at a frequency with my NanoVNA on the Smiths Chart.? One stage closer. 73s Dave? ?G4RVH

Hi Dave? G8PTN. So this morning took the driver Mosfet off the board that drives S8 Relay. Replaced the Fet and in Test Mode all working as it should switching between the Capacitor bank and the

Hi Rob, The ATU-100 does work without modifications. The power rating is somewhat optimistic since the component types/ratings are not necessarily as specified by the original designer. It’s

Guys. Was looking at purchasing one of these units, but with all these mods everyone are doing, is it worth purchasing? Cheers ?Get BlueMail for Android ?

Hi David, If there is a short between the "Gate" and "Source" of the MOSFET, it may have damaged the PIC, since it would have been driving a logic ‘1’, which is now shorted to ground. It also

Hi Dave? G8PTN. YES the ATU is doing exactly the same as your photos so obviously performing correctly.? Hopefully this week after changing the S8 Relay FET all should be OK. Thinking ahead I might

Hi Dave? ?G8PTN? the reason I put your callsign is so readers can distinguish between you and I. Your so kind to take the time out to help me.? It's so much appreciated believe me. Anyhow it's

Hi Dave? G8PTN Just a few photos of the bottom of the ATU box to help me servicing in the future.? I will replace S8 FET this week and hope this cures the problem of S8 Relay being permently being

Hi David, Unfortunately, I can’t recheck the behaviour on my ATU-100 at the moment since I modified the firmware, but I am sure when I first built it, everything worked as expected. To summarise. -

Ditto Dave I meant to say to you that hope you are well also my friend. I suppose if all else fails and that transistor that feeds S8 refuses to switch off THEN I could fit a switch on the front panel

Good Morning Dave? G8PTN.? Thanks ever so much for trying to help me out.? Luckily I have two of these PCBs and they both have the same fault whereby you switch the unit on just the main switch.

Hi David, I hope you are well. This is the correct behaviour. On power up “S8” defaults to “ON”, which means the capacitor bank is connected to the RF output side. When you are in the manual