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Motorola Spectrum VHF cut chart?

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Otis413

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I recently acquired a couple of new A90 VHF 5/8 wave Motorola Spectrum antennas with springs and one used coil without the spring. I was wondering if anyone had the Motorola cut chart? I think they were already cut, but not used.

As a side question, shouldn't one 5/8 wave base loaded antenna have the same cut length (aside from spring differences) as any other? the base coil is just an impedance match anyway, or am I wrong?

Thanks for any help!

KD8VBV
 

cmdrwill

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The 'base coil' is a matching transformer. The rod length should be close to the same. Without the spring the overall length may be slightly longer. Reason: the spring adds some mass.
 

SCPD

QRT
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65,126
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mine

I recently acquired a couple of new A90 VHF 5/8 wave Motorola Spectrum antennas with springs and one used coil without the spring. I was wondering if anyone had the Motorola cut chart? I think they were already cut, but not used.

As a side question, shouldn't one 5/8 wave base loaded antenna have the same cut length (aside from spring differences) as any other? the base coil is just an impedance match anyway, or am I wrong?

Thanks for any help!

KD8VBV
I have one trimmed to 2m with an mfj analyzer. Went and measured it. 43" without a spring.
 

Otis413

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Joined
May 10, 2013
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Location
Cass WVa
I have one trimmed to 2m with an mfj analyzer. Went and measured it. 43" without a spring.
Thanks, I mainly wanted to know if it was long enough before going to the trouble of installing it, I can trim but it's harder to add length...

Question; Just to be sure, did you mean it's 43" and has no spring, or that it's 43" not including the spring?? The whip length on mine is 43.25", if I was real careful I could prob get 43" to stick up above the spring.
 
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