| Author |
Message |
    
Boxcar
| | Posted on Friday, March 07, 2003 - 5:27 pm: | 
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Anyone got any good info on how to make a homemade dummy load? Or possible web sites? I've been wanting to do this for quite some time.
-BoXCaR- |
Buck
| | Posted on Friday, March 07, 2003 - 7:40 pm: |
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Boxcar....
I built one from two 100-Ohm, 5W resistors connected in parallel and submerged in a tin of oil.
Start by drilling a hole hole in the lid of a 250ml paint tin to suit the SO259 connector. Solder around it to prevent any leakage when the oil is added. Next, a leg of each resistor should be soldered to the metal lid and the opposite ends both/all soldered to a length of stout copper wire which is taken to the center connector of the socket.
With a multimeter, measure across the SO259. There should be a reading of 50-Ohm's and no open/short circuits.
If all is well, fill the tin to the brim with engine oil and attach the lid firmly in place.
At this point you'll probably notice that oil will splurge over the sides so don't do this on the kitchen table!
DO NOT USE WIRE WOUND RESISTORS....THEY WILL NOT WORK!!!
If you have any questions ask and I will try to help you |
radiodude
| | Posted on Friday, March 07, 2003 - 11:30 pm: |
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Sounds good !!! How about a diagram??? |
Boxcar
| | Posted on Saturday, March 08, 2003 - 2:03 am: |
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That's exactly what I was thinking radiodude!!! |
Buck
| | Posted on Saturday, March 08, 2003 - 8:37 am: |
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Well I have a picture of it....I will try to post it.
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Buck
| | Posted on Saturday, March 08, 2003 - 8:40 am: |
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That is a picture of just the lid....When finished it should give you a 10 watt 50ohm dummy load. Just make sure the resistors are not Ceramic wire wound! |
Boxcar
| | Posted on Saturday, March 08, 2003 - 9:55 am: |
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I will give 'er a try and see what happens. I really appreciate it buck! Thanks!!!!!!!!!
BoXCaR |
ryan
| | Posted on Saturday, March 08, 2003 - 12:15 pm: |
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good stuff. now how would i go about making a dummy load that can handle 100 watts? |
Buck
| | Posted on Saturday, March 08, 2003 - 7:38 pm: |
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Ryan....you will need to find 20-5 watt 1k ohm resistors...or 10-10watt 500 ohm resistors...or any other combo that will give you close to 50 ohms when finished.
Buck |
ryan
| | Posted on Saturday, March 08, 2003 - 10:55 pm: |
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makes sense. i could always rig up a circulating oil resivior (sp?) with a pump so i could TX continuous into it. now will this setup work for VHF too? i got a radio that i want to put on the MURS freqs |
Buck
| | Posted on Saturday, March 08, 2003 - 11:29 pm: |
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I dont see why it wouldnt work for vhf....Havent tried mine on vhf yet |
Simon
| | Posted on Sunday, March 09, 2003 - 10:47 am: |
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MECI have non-inductive power resistors available.Two 102 ohm 50wwill set you back around $8.00 |
