[amsat-bb] Helical Antenna for 2-meters

[Robert Bruninga]

Yes, a 2m helical is huge.  We have one for 250 MHz almost half the
wavelength, as 2m and it is about as big as one wants to handle.  Bob,
WB4APR

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Dave Mann
Sent: Sunday, February 05, 2017 10:06 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Helical Antenna for 2-meters

I just did some calculations from the ARRL Antenna Handbook.  I came up
with a 6-turn helical with a diameter of 25.826" and a length of 121.65".
My first thought was "whoa, dude, like OMG!" (I'm a high school teacher,
ok?)   I rechecked my calculations and came up with same, plus an
impedance of 150 ohms.

Years ago I used a Fritzel Helical for 2m when I was DA1BB and VP2EHF
(during Hurricane Luis in 1994 it ended up someplace out in the Anagada
Straights between Anguilla and Sombrero Island).

What say, you all?   Advice, comments welcomed

73
Dave, N4CVX


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