Hi David? ?G8PTN? ?
UPDATE? on Progress.? 99% sure that the problem has now been sorted.
I had DEAD SHORT across the INPUT BNC Socket and that's obviously why I had to swop over the leads.? And that is why I was getting 10% REFLECTED Power reading.
What a Swine to get that Dead Short off because I've used SMA sockets on the PCB Board and SMA Plugs and Sockets on the back panel mounted on a Right Angled piece of PCB Double Sided Board so had to work away with the back panel off the box with a dremel tool to burr off the short.? I would never have believed my mistake.??
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So took off those Stockton Bridge Resistors and replaced them with 50 ohms ones which I checked before fitting them.? Measured in circuit on the board with the transformer they both measure 1.7 ohms. Anyhow then put 10 watts into what I thought was the Input of the ATU and a 50 watts 50 ohms Narda dummy load on the Output,? absolutely nothing.
BUT I changed the leads over and the results shown below so yet again totally confused except at Least the relays were chattering.? So what is going on God knows.
At the end of the day this was just a fun project.? It's obviously very close to working properly but something simple now but haven't a clue where to stab.? It's an interesting fault.? One would think that the Dummy Load wasn't connected to the ATU so will check everything out of course when time on my side.? I spend alot more time with my XYL now as she has MS.
73s? David? ?G4RVH
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