>
>While making some measurements with an MFJ-259B impedance
>analyzer this evening, I noticed some strange behavior. The burnt
>plate choke I was sweeping looked like a Hi-Z (Z>650 ohms) over
>most of the HF spectrum except for the region c. 16 MHz, where
>the choked looked something like 200 + j 500. Thought that this
>might be a problem with the analyzer, so I removed the choke and
>replaced it with a 330 ohm carbon resistor. The 259B read c. 330 Ohms,
>R + j 100 over most of the HF spectrum. This seems a little strange
>as I would expect the reactive component to vary linearly with
>frequency. When I replaced the 330 ohms resistor with a 68 ohm
>resistor, the readings became more believable (e.g. ~68 + j 2). Any
>idea what could be causing this constant reactive offset at high
>R levels?
>
The MFJ-259 was not designed according to good engineering practice?
Owners who have the ''dipmeter'' attachment tell me it does not work
right.
>
later, Mike
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|