You can use an MFJ269x analyzer or equivalent.
Put a 50 ohm non-reactive resistor in parallel with the trap and use the
frequency button to scan
it. Look for the zero reactance points. This will be fairly broad, but will
show you where the
If you have a higher end analyzer like the AIM 4170, which can measure higher
accurately, use a 450 ohm resistor, run a scan over the 20-10 bands and watch
crossovers, which should be at the peak R points.
----- Original Message -----
From: "Eric - VE3GSI" <firstname.lastname@example.org>
Sent: Thursday, October 11, 2007 11:39 AM
Subject: [Antennaware] Checking Hy-Gain TH7 Traps
| Is there a way to test the traps used on the Hy-Gain TH series antennas for
| resonance before assembly or even with the traps on the elements? I have
| tried my dipper but could not find a way to couple it to the traps.
| Yes I know the traps are simple to check with an ohmmeter and visual
| inspection, but curiosity got the best of me and I wanted to see if I could
| excite them somehow before putting the antenna up the tower.
| Eric - VE3GSI
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