On 10-Sep-2007, K7ITM wrote:
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From: K7ITM
Newsgroups: rec.radio.amateur.antenna
Subject: Substitute wire in Trap?
Date: Mon, 10 Sep 2007 14:18:17 -0700
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On Sep 9, 10:52 pm, Clayton wrote:
Thanks for the replies everyone
Scott,
Could you please explain how I can use a grid dip meter to measure
the
resonant frequency and adjust the number of turns and/or wire spacing
to
get it where it needs to be?
I just picked up a grid dip meter but have never used one.
.....
Its most Appreciated
Regards
.....
You'd probably do well to practice with your dip meter with some
resonant circuits "on the bench." You want to couple the meter to the
coil of the resonant circuit to get a dip. To start, you can couple
it closely, but the dip will be hard to read well, since the resonant
circuit you're measuring and the one in the dip meter will interact
strongly, "pulling" the dip frequency. So when you get a strong dip
near a reasonable frequency, pull the dip meter further away, till you
get just a gentle dip. Then the frequency readout (assuming the
frequency scale on the meter is accurate) should be accurate. As with
most instruments, it's good to get some experience with a dip meter so
you have an idea when it's giving good readings and when it's in
error.
Cheers,
Tom
Cheers,
Tom
The dials on Dip Meters are usually not very precise and may be inaccurate while loaded by the
circuit under test. You can improve your frequency determination by listening to the dip meter
signal on an accurate receiver or with a frequency counter coupled to the coil.
Ken Fowler, KO6NO