An other useful function is to find out what capacitor is needed for resonance
with a coil (in hand). You set the 259 (or 269, what I have) in capacitor mode,
connect the coil to it and get a reading that tells the capacitance. If you
want to know the resonance at, say 7 MHz you set the frequency at 7 MHz,
connect the coil and read the needed capacitor. Simple and need no calculations.
Hans - N2JFS
-----Original Message-----
From: Dan Zimmerman N3OX <n3ox@n3ox.net>
To: towertalk <towertalk@contesting.com>
Sent: Mon, Mar 15, 2010 1:05 pm
Subject: Re: [TowerTalk] MF-259B
>
> I found that it compares favorably with a capacitance/inductance meter if
> the MFJ is use in that manor.
>
I don't have another meter, but I use my MFJ-259B to measure inductances
and capacitances and I find that it works well and compares favorably with
calculated values of inductance and labeled values of capacitance.
Inductance and capacitance measurement is probably the thing that I use mine
for most, when I'm building matching networks, etc.
It doesn't work well to measure large or tiny reactances. In fact, I think
I've heard you'll get the *best* results if the reactance is something in
the vicinity of 50 ohms.
What I usually do in practice is do a quick frequency sweep looking for any
weirdness. There's usually a band of frequencies where the meter will
report a value of inductance or capacitance that changes very little with
frequency, and that's what I look for.
I think that range happens when the reactance is not too big or small.
73
Dan
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