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Also got to file away a little more the the double sided PCB.? Nice easy job. 73s? G4RVH?

Hi David.? Yes very valid point so will see what happens to the display and any problems then I know it's the frequency getting dragged down.?

Cleaned the board and you can clearly see the 2? x? 64k resistors in parallel.? 73s? G4RVH?

Hi David,
Just for information, I think the I2C interface for the OLED operates at 100kHz.
I don’t know if the plan is to pass the display signals via the feedthrough filters.

If they have a high insertion loss at 100kHz, you may have issues with the display.
73, Dave

This PCB Box slides into an Aluminium extrusion box with plenty of room.

73s? G4RVH?

Hello David.? I've another back plate double sided copper to replace the one that's on for two x? BNC Sockets input and output.

Those Double Pi Network Feedthu's as you will know are of the highest quality and when they shut the transmitter down at Roseneath at Fastlane Richard G3NBB and I were allowed onto the site to literally take the feedthru's out the the transmitter cavities.? We both got about 100 each.? RS used to stock them years ago ?10 each.? The highest quality for choking off stray RF as we know.

73s G4RVH

Hello David. Thanks for the info as very useful. I've been busy rewinding the transformer this afternoon and also cut with a very useful cutting saw a hole in the PCB box I made a while ago so that I can get ar the underside of the board and now it's all secure.? I've tested the unit again and all relays coming on in Fast Test. So just working away slowly.

73s G4RVH?

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Hi David,

I hope your?testing goes well.

With a 50? source impedance and a load of 75?, I would expect the VSWR to be 1.5:1.

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Hello David and Immo

All clear and understood thanks.

I might get round to winding the transformer today.? Just nice to know that the PIC processor is all working and all of the Mosfets are switching properly.

Won't be long until I can feed 10 watts of RF in with a Narda 50 ohms 50 watts Dummy Load on the output.

Also have a 75 ohms load which should read 1.2 SWR.

73s? G4RVH

Hi David,

Your marked up picture is still not quite right.

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Where you have shown "CELL 10", it should read "CELL 0A" (refer to the table above).

"CELL 10" is the first address on the second row.

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73, Dave

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Hi David .

Many thanks for sending over the explanation and finally the Penny has dropped and fully understand now.? Thank God for that.? 73s G4RVH?

Hi David,

I have shown two tables below, one shows decimal numbering and the other hexadecimal.

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The address naming convention used in the manual for the ATU100 manual is "Cell" number. Perhaps if it had said "address" it would have made more sense.

Anyway the number for an Address/Cell is hexadecimal (the bottom table).

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I hope that helps.

73, Dave

look here...

Hi David.??

To be perfectly honest with you I am totally and utterly confused with the CELLS now from ZERO to 31.? Please show how you are counting the CELLS from ZERO to say 31 to clear up this problem.? Sorry for the trouble.? ?73s? G4RVH

Hi David,

Immo has covered your question with respect to Cell 31.

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I have also highlighted Cells 7 and 8 in yellow which are the vertical and horizontal adjustments for the display.

For my OLED, I had to set both values to 0, but this is display specific.

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As stated in the user manual, all addresses and cell values shown in the editor are in hexadecimal. However the data values are made user friendly for convenience.
See an extract from the manual below.

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73, Dave

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As 10 at cell 31 is default, you must change nothing...

73, Immo

Hi David,
That’s great news, well done.

The supply current seems higher than I would expect.
Components:
Specified nominal coil resistance = 720 ?
D3 diode forward voltage at 0.5 A = 0.9 V
Therefore:
Relay current = (Vsupply – D3 diode drop) /720 x 15 = 252 mA
Assuming 18mA for the PIC and OLED display, Total = 270 mA
I think your test LEDs may be the culprits. Looking at the photo, the LED has a 470? current limit resistor, which probably means the current is 20mA/LED, 300 mA total.
That would give a total of 270 + 300 = 570 mA, which looks close to what your meter is showing.
I would consider reducing the current for the LEDs. I would expect a few mA would be more than adequate, and it is only for testing.
73, Dave

Hi Immo.

Could you draw a coloured circle round CELL 31 for me.? As far as I know I have marked CELL 1 in Purple.

73s G4RVH

You will see in the photo all of the tiny red LED's are all lit up.

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73s? G4RVH?

Hello Immo

I've taken the Balun transformer off to rewind shortly.? Taken the old windings off because I used a tiny blob of super glue so had to cut the windings out altogether.??

So this project really coming together now I know all the Mosfets are switching all the relays on. Great news.? Yes there definitely was 11 turns on each side of the transformer.? WELL spotted Immo

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73s? G4RVH

Hello again to both David G8PTN and Immo.

I have very good news for both of you. Firstly the 68k resistors WERE 68K but 2 x parallel to give 34k on both 34k resistors so both reading exactly correct.? Anyhow I had soldered to B1 & B2 capacitors and NOT the little silver soldered pads so obviously no 5vdc BUT now soldered to the correct pads.? Switched the unit on with BYPASS TUNE AUTO connected to ground and all the relays switched on after 2 seconds and the Display showing TEST and the PSU showing about 500ma being drawn. So fabulous news and just the transformer to correct now.