I think that depending on how many resistors (value and wattage for
each?) you employ, you'll have a somewhat high stray
inductance/capacitance, and this will degrade load performance.
Best regards
Guillermo - LU8EYW.
on4kj escribió:
Hello all,
I am in the need of a 1Kw, or a little higher , dummy load.
From my own early business I have still a few boxes ( 2000 each ) of metalfilm resistors on the shelf.
Thought it might be possible to use them in serial /parallel combination to set up a 1 Kw 50 Ohm dummyload. Since those resistors where delivered on rails of 2000, guess it would not be that difficult to replace the tape by a heavy wire or copperstrips.
Knowing that Zt = R + jX and we only need R, jX need to have a value very near to zero. ( not frequecy dependent
My question, since I dont dispose of the needed measuring instruments , is there some one out there who had this nasty idee before. What about the jX value of a metalfilm L and C. Did someone messured these values in a real application. I should want to know before going any further, if someone realised this approach, and what are the results?
Thanks for a shout.
Jos on4kj ( OR4G Operator )
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