[Elecraft] Re: QRP Dummy Load

[Don Brown]

Hi

OK How about this: A small PC board with a BNC connector and pads for =
two of the 35 watt TO-220 100 ohm resistors. The resistors would mount =
like the output transistors in the K2 between the PC board and the box =
using the same type of hardware. The PC should be laid out using =
stripline techniques so it maintains a 50 ohm impedance. The box would =
be a KRC2 size box. Also on the PC board would be an 20 db attenuator =
and RF probe with banana jacks to connect a DVM and a BNC to connect =
something like the WM-2. The box would be the heatsink and could handle =
about 30 to 50 watts for maybe 5 or 10 minutes or 15 watts continuously =
maybe even 100 watts for about a minute or two. It should be cheap to =
kit and would do all of the calibration required for the K2, K2/100 and =
the transverters. A stick on label could be provided for the box with =
the power out to DC voltage ratio on the internal RF probe. It should be =
designed with no calibration in mind so someone building a K2 with no =
test equipment could build it and not have to go out and find a =
calibrated meter to set it up by.=20

Don Brown
KD5NDB


SNIP



  Persinally, I'd prefer to have them keep it simple... maybe a tap and=20
  detector which could be used with a Hi-Z DMM/DVM and maybe a (printed) =

  look-up table to calculate power into the dummyload, but nothing more=20
  'involved' that that.

  73,

  Tom  N0SS


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