[Amps] Dummy Load

[David Kirkby]

Mark Marsden wrote:
> Hi Stefan & Will
> 
> That's very interesting to me. I'm looking at a possible 50R 40dB attenuator based on the new thick-film-on-steel planar resistors by TT-electronics/Welwyn. They aimed at the automotive dynamic braking & welding industry, with a very low £/kW ratio.
> 
> Farnell part numbers are 
> 465-9569  50R 2-8kW £13.93
> 465-9600  50R 5-16kW £23.52
> 
> It'll be interesting to see if the meander-line construction can be matched to give a good return loss across the HF spectrum.
> 
> Best 73 Mark G4AXX 
If you do build an attenuator, I would suggest using the minimum 
attenuaton you can get away with using the lower quality resistors, and 
making the last 6~10 dB or so from a decent quality attenuator. That way 
any test kit you connect will see 50 Ohms over a very wide range of 
frequencies. It means your attenator has an input and an output 
terminal, but that is common - just don't connect it back to front!!


-- 
David Kirkby,
G8WRB

Please check out http://www.g8wrb.org/
of if you live in Essex http://www.southminster-branch-line.org.uk/