[Lowfer] Antenna Analyser Mod?

[N1BUG]

I haven't been following this thread, but information on the 
modifications I made to an MFJ-259B can be found here:

<http://blog.n1bug.com/2016/12/22/adding-630-and-2200-meters-to-the-mfj-259b/>

I didn't calculate the final inductance values but if you are handy 
with toroid calculations you can work them out from the core type 
and number of turns.

I have since discovered major issues with accuracy of the instrument 
at these frequencies when the load is reactive. Based on my 
experience I would not recommend a modified MFJ-259B for tuning 
transmitting antennas on LF or MF.

73,
Paul N1BUG


On 01/12/2018 01:46 PM, KD7JYK DM09 wrote:
> "Hi, I did exactly that on my '259. Added 940mH to the lowest range. Yes
> the oscillator now ranges from 250 to 550 kHz. But it is not stable at
> all, typically wobbling +/- 2 or 3 kHz. So not reliable enough to tune
> up an antenna at say 474kHz."
> 
> I'm not playing in the lower bands yet, so not TOO critical at the point
> in time, my "immediate" (relatively) demand is to make an antenna for my
> wife as close to centered on 660 KHz as possible.
> 
> For those that have done the mods to the 249, 259, et cetera, what kind
> of ranges did you get from what L values?
> 
> Kurt