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Repair power supply
Topic Started: Friday, 25. March 2011, 14:10 (1,232 Views)
Chris9
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26 Charlie Tango 469

Anyone know much about power supplies?
I have here a 50amp continious linear type power supply.

Asked a local company to look at it for me, but they tested it to 48amps constant and found no issues.

However when I get my ranger 2970DX on it at about half power or more (10amps ish) the supply cuts out when I key up.

Have to then power cycle the supply to reset it.

It's as if it's susceptable to RFI or something.

Radio works fine on another supply, so no problems there.

Can post a pic if needed.

Thanks in advance.

Chris
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ChrisC
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26 Charlie Tango 437

It sounds like your psu is not liking the RF.

Got any big ferrite rings to chuck on the power cables?
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VoG
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chris9
Friday, 25. March 2011, 14:10
Radio works fine on another supply, so no problems there.
Would be curious to know if the Supply works fine on another radio??
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Mark in Essex
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26 Charlie Tango 037

Cherokee
Friday, 25. March 2011, 14:51
chris9
Friday, 25. March 2011, 14:10
Radio works fine on another supply, so no problems there.
Would be curious to know if the Supply works fine on another radio??
Was also thinking the same... Does it also cut out on full TX power from the Ranger?
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Chris9
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26 Charlie Tango 469

added a cb radio(4watts) plus a cte 747 amp and it does the same, this setup works fine also on another power supply.

Tried a clamp on ferrite and wrapped the power cable around it twice and through, but no difference.

Yes the ranger on full power TX it does the same.

Maybe the trip is over sensitive?

Chris
Edited by Chris9, Friday, 25. March 2011, 15:32.
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VoG
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Despite your saying "Asked a local company to look at it for me, but they tested it to 48amps constant and found no issues" it really does sound to me like that PSU just plain isn't pushing out enough power.

I really cannot see that it'd suddenly take a dislike to RFI to the extent that it'd roll-over for two separate radio set-ups. And it is highly unlikely that BOTH the Ranger and the CTE are both (all of a sudden) giving really bad spurious signals strong enough to "kill" a PSU.

I'd suggest that the Local Company either cocked-up the test, or the PSU has thrown a wobbly since the test was done.
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ChrisC
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26 Charlie Tango 437

Have you got any spare car headlamps.
Plug in a headlight to it and see if it does the same with 55w
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Chris9
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26 Charlie Tango 469

before I took it to the local company, I put a 300w inverter on it and put 3 x 100 watt light bulbs on it.

I could find no fault with it.

But inside it looks like a homemade/custom supply.

so maybe it wasn't setup to cope with RF.

Do you have to build something in to cope with RFI ?

Thanks
Chris
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Chris9
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26 Charlie Tango 469

I've uploaded some pictures here:
PSU pictures

maybe if anyone around who understands these things better than me could give me a few pointers on where to start.

Thanks guys

Chris
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VoG
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chris9
Friday, 25. March 2011, 18:27
Do you have to build something in to cope with RFI ?
Not that I am aware of. . . . . Sure, it's always a good idea to build-in some suppression (chokes/filters/ferrites) to reduce the risk of RF Noise, but I am not aware of anything that actually differs in a PSU for a Radio to any other 13.8v DC PSU.

Maybe MadMark can throw some light on the subject as I know he has built, restored, repaired a few Power supplies.
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MadMark1
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163 Charlie Tango 020
you say it looks home made/custom supply, does it have any over voltage built into it ? if it does it proberly uses a thyristor as a crowbar for shutting down the supply. if so these can be very prone to RF and as such they can fire on startup making it difficult to actually start up the psu, they can also fire on spikes such as when you keyup, this maybe your problem as i doubt if its due to the psu folding back on current, not at low current draw anyway. so it would seem like its a thyristor. but without more info or some internal photos of the psu its hard to say.

Mark

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Chris9
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26 Charlie Tango 469

thanks very much for that mark.

photos are ---> here <----

hope this gives you some useful additional info.

Also if it's of any interest, with a voltmeter on the outputs, you can see the voltage drop very quick when I keyup. It get down to about 10v ish (hard to tell exactly) and then trips off.

Chris
Edited by Chris9, Saturday, 26. March 2011, 14:01.
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MadMark1
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Thanks for the photos Chris, but it doesnt shed any light on it really, tested to 48 amps constant ?

i would as others have said and that is to load it with a decent car head lamp, i use two halogen ones for testing, the ones i have draw around 15 amps, with this you can see any voltage drops and test for any signs of a componant over heating , it may need to go to someone who knows how to test it and check it properly.

Mark
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Chris9
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26 Charlie Tango 469

thanks for that Mark.
The place I took it to fix power supplies all the time and said that they put a resistor on it which pulled 48 amp and it was holding steady.
Which is what I found when I put an inverter on it and 3x 100watt house bulbs.
They said they could go through it at a cost of around £200 or so, so I declined and fetched it back.

They told me it must be the radio, but the said radio works on other supplies fine and other radios cause this supply to reset as well.

Maybe I'll have to recover the transformer from it and capacitor and try my hand at building one for myself.

Can you recommend a schematic?

Chris
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MadMark1
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163 Charlie Tango 020
What i shall do Chris if you want to, is i can scan and send you via e-mail the full schematics for a power supply, its a easy build not to much to do really, but you can add to it when you want to.

Look me up on QRZ.com for my E-mail

Mark

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"It's not the class of license that the Amateur holds but the class of Amateur that holds the license"
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Chris9
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26 Charlie Tango 469

have sent you a pm.

Whilst your there the 2 transformers from this supply show rating of 13.33amps and 16.5v.

so times two, thats 26.66amps, but the supply says that it's a 50amp.

How does that work?

Thanks again.
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MadMark1
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163 Charlie Tango 020
Not sure who thats aimed at Chris ? But as you say the figures say its only around 26 amps.

But you do have two secondary winding on each transformer, so it is possible to connect the transformer secondary windings in parallel. this would give double the amperage. i think it was yellow that was the centre tap on the transformer, this would normally be at zero voltage if its used as a bi-phase ( center tapped ) arrangement.

so if you connect each transformer up by wiring each secondary winding in parallel, you would have about 26 amps, not taking into account losses an all. so times that by two transformers and you should be able to get 50 amps peak, But your going to want a BIG value UF capacitor for this as on the negative cycle the capacitor would be supplying the current ( so to speak )...

Look up centre tapped transformers or Bi-phase transformers ( same thing ) and have a read up on them.


Mark

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Chris9
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26 Charlie Tango 469

thanks a lot Mark very helpful indeed.

Chris
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