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SWR at Radio

 
Edited

David

I'm not sure what you mean by TRX ring?

But if you look at the SWR bridge you will see that at all points around it, measuring with an ohmmeter will say there's a short to ground.?? Via the various windings if you check against the Sch. http://www.qrz.lt/ly2bok/Konstrukcijos/ATU-100/Schematic_ATU-100-7x7.pdf

vk3pe

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If you connect a dummy load to output and swr meter to input and provide a test signal what does the swr meter show? This while the tuner is in bypass mode?

The swr should be close to perfect on all frequencies.

Second, measure with a multimeter or scope the voltage after the diodes while applying power and the unit in bypass mode.

And with the tuner disconnected from DC power, what resistance are you measuring at the point after the diodes? I suspect something wrong with the resistor values or connectivity.?

Best regards Onno

Op di 30 nov. 2021 05:34 schreef David-W6DMW <dwest24@...>:

[Edited Message Follows]

Question for all since I think I've found the problem... well the issue but not where the problem really is.

There should be no continuity between the ANT Center and the shield and vice verse right? I have continuity every way I test between the input and output connectors. I'm asking because I cannot think of a reason why this should be like this.

So... do I dig in and try and find the issue or should I send it back to the seller and say replace it or send me my money back?? Have any of you had? this quality control issue?

 

Thanks for the input, I've decided to send it back.? If I had built it then I would be game for all the testing and such but I bought it built.? I expected it to work.??


On Mon, Nov 29, 2021 at 9:23 PM Onno PA1AP <pa1ap68@...> wrote:
If you connect a dummy load to output and swr meter to input and provide a test signal what does the swr meter show? This while the tuner is in bypass mode?

The swr should be close to perfect on all frequencies.

Second, measure with a multimeter or scope the voltage after the diodes while applying power and the unit in bypass mode.

And with the tuner disconnected from DC power, what resistance are you measuring at the point after the diodes? I suspect something wrong with the resistor values or connectivity.?

Best regards Onno

Op di 30 nov. 2021 05:34 schreef David-W6DMW <dwest24@...>:

[Edited Message Follows]

Question for all since I think I've found the problem... well the issue but not where the problem really is.

There should be no continuity between the ANT Center and the shield and vice verse right? I have continuity every way I test between the input and output connectors. I'm asking because I cannot think of a reason why this should be like this.

So... do I dig in and try and find the issue or should I send it back to the seller and say replace it or send me my money back?? Have any of you had? this quality control issue?

 

¿ªÔÆÌåÓý

Look at the CIRCUIT DIAGRAM, there IS a DC short to earth on the RF input.
You are chasing phantoms, there is nothing wrong with your ATU100.
Try looking at the circuit diagram before you blame the seller for sending faulty unit

On 30 Nov 2021, at 03:30, David-W6DMW <dwest24@...> wrote:

[Edited Message Follows]

Question for all since I think I've found the problem... well the issue but not where the problem really is.

There should be no continuity between the ANT Center and the shield and vice verse right? I have continuity every way I test between the input and output connectors. I'm asking because I cannot think of a reason why this should be like this.

So... do I dig in and try and find the issue or should I send it back to the seller and say replace it or send me my money back?? Have any of you had? this quality control issue?

 

Well, I bought a fully assembled kit.? I wouldn't think that I would need to take the thing apart and redo their work to make it work.? If I had made the kit myself, I would blame myself.? In this case: the seller did indeed send a faulty unit.
 

¿ªÔÆÌåÓý

you say "There should be no continuity between the ANT Center and the shield and vice verse right? I have continuity every way I test between the input and output connectors. I'm asking because I cannot think of a reason why this should be like this.¡±
You obviously have not looked at the circuit diagram freely available on the internet.
The reason you are getting a short across the RF INPUT - IS BECAUSE THERE IS A DC PATH TO EARTH FROM THE CENTRE PIN OF THE RF IN SOCKET.
Note :- I said DC path. At RF frequencies it is not a short circuit.
Again, if you look at the circuit diagram you will see that there is a DC path to earth between the RF input and output sockets via L1,L2,L3,L4,L5 and T1.
They are not directly connected but BOTH have a DC path to earth.
You cannot think of a reason why this is so because you cannot read a?circuit diagram.



On 30 Nov 2021, at 21:27, David-W6DMW <dwest24@...> wrote:

Well, I bought a fully assembled kit.? I wouldn't think that I would need to take the thing apart and redo their work to make it work.? If I had made the kit myself, I would blame myself.? In this case: the seller did indeed send a faulty unit.

 

Hope the seller will support you well. To bad the unit isn't working. Best regards Onno

Op di 30 nov. 2021 22:27 schreef David-W6DMW <dwest24@...>:

Well, I bought a fully assembled kit.? I wouldn't think that I would need to take the thing apart and redo their work to make it work.? If I had made the kit myself, I would blame myself.? In this case: the seller did indeed send a faulty unit.

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