[Elecraft] Metal Oxide Power Resistors Inductive?

[Don Brown]

Hi

MOS resistors are not inductive at HF frequencies and make great dummy loads. The Elecraft DL1 and the OHR 100 watt dummy load use several MOS resistors in parallel or series parallel. The oxide is deposited on a ceramic base in a single coating so there is not any coiling to create inductance. I use them to make dummy loads by soldering a 51 ohm 5 watt inside a PL259 connector. You can use a PL259 to BNC adaptor so it will fit the K2, K1 or KX1. These loads will take 15 watts for a short time. I also have one of these with a 100 ohm MOS resistor and another with a 25 ohm resistor (2 51 ohm in parallel) that I use to check or calibrate the SWR bridges in the antenna tuners or KPA100. You can get them from Mouser in 1 watt 3 watt and 5 watt sizes

Don Brown
KD5NDB


  ----- Original Message ----- 
  From: Trevor Jacobs<mailto:k6ese-list1 at earthlink.net> 
  To: elecraft at mailman.qth.net<mailto:elecraft at mailman.qth.net> 
  Sent: Tuesday, June 22, 2004 12:35 PM
  Subject: [Elecraft] Metal Oxide Power Resistors Inductive?


  Hey Gang,

  This brings up a question I've wondered about. Are Metal Oxide power
  resistors inductive? Such as these:
  http://www.xicon-passive.com/specs/mo.pdf<http://www.xicon-passive.com/specs/mo.pdf> ? I don't see a spec in the data
  sheet.

  73's Trev - K6ESE
  http://www.qsl.net/k6ese<http://www.qsl.net/k6ese>


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