FULL CONSTRUCTIONAL DETAILS OF THE HIGH POWER DUMMY LOAD I MADE
Materials you will need:
1: Golden Syrup tin (Without the syrup in it “Eat it 1st Yum Yum”)
2: SO239 Socket
3: 20 3watt or higher (Not wire wound) 1000 Ohm resistors
4: Copper Clad board
5: Silicon Sealant
Left Click on the Images for larger View
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- AS THIS PROJECT CONTAINS TRANSFORMER OIL PLEASE READ BELOW!.. DISCLAIMER: I have made this project as shown for my own personal use, if you intend to copy it you do so entirely at your own risk, I will accept no liability whatsoever for any injuries sustained in its construction and or its use. As this project contains transformer oil please use on the lowest power settings when using the Dummy Load. If you do run High Power only use for the shortest possible time and always keep checking how HOT its getting, as if it gets very hot there is a chance that the pressure inside could blow the lid off and splatter hot oil everywhere. ALWAYS USE THE LOWEST POWER SETTING WHEN CHECKING YOUR TRANSMITTER!
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- Buy a tin of Golden Syrup from the local supermarket, make sure it’s in date as you can eat its contents lol. Then wash the tin out with soapy water and dry it.
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- The Lid and the SO239 ready for fixing.
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- Don’t forget to use silicon sealant when fitting the SO239 as you will be filling the tin with Transformer oil (We do not want any leaks).
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- Solder a piece of 18swg tinned copper wire to the SO239 make sure that the SO239 is filled with solder to stop oil leaking out of it.
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- Slide some thick sleeve over the 18swg wire just long enough to come out the end of the copper clad allowing for the spacing that you will giving them away from the lid.
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- Cut 2 circles of single sided copper clad that will fit neatly through the opening in the syrup tin and drill a 6mm hole in the centre. The 6mm hole is for clearance of the wire that you have soldered to the SO239.
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- Now mark 16 evenly spaced points on the outer edge about 6mm in from the outer edge of the copper and 4 evenly spaced holes in at about 16mm from the outer edge, then centre punch these marks.
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- Drill both pieces of copper clad the same, like these, use a drill just big enough to clear the wire on the resistors you are using.
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- Then start to solder in the resistors to one piece of the copper clad like shown, Until it looks like this one shown.
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- Now comes the difficult bit, you have to fit the other copper circle onto the resistors (And it can be a pain), but when you have done it solder these in place too. It should look something like mine.
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- This a side view of the project so far..
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- Now slide the Resistor assembly over the 18swg wire and solder to the copper clad.
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- Take you tin and print a label of your choice, then attach this to the tin and cover with clear tape to protect the printing. Fill the tin nearly to the top with Transformer oil and put your completed lid on, make sure you seal the lid with silicon sealant.
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- That’s it the completed High Power Dummy Load, Mine gave a reading of 50.05 Ohms. If possible use the highest tolerance resistors you can get your hands on. Mine was made from resistors that I had already hence they look a bit scruffy, but the no one will see them will they lol.
