Congrats on the Gulf-Alpha. I had one and loved it. Built battleship strong, computer
optimized, using a Tee-match. Nothing flimsy about it! The only thing I did stupid was
sell it when I had to move.
If anyone wants to part with one, let me know!
From: AMSAT-BB <amsat-bb-bounces(a)amsat.org> On Behalf Of Gregory Beat via AMSAT-BB
Sent: Saturday, February 29, 2020 9:47 AM
To: AMSAT-BB(a)amsat.org; nachif(a)terra.com.br
Subject: Re: [amsat-bb] Gulf Alpha Antenna Manual
In November 2015, Tim Chapman, KB7MDF owner of Arrow Antennas purchased the VHF, UHF and
Satellite product lines from Pete, owner of Gulf Alpha Antennas.
Arrow Antennas may have kept (or posted) documentation for those earlier Gulf Alpha
Assembly and Tuning Procedures for 2 meter – 70 Cm Dual band Circular Polarized Satellite
Yagi 1. Unpack and separate all parts, UHF, VHF element rods, retaining nuts for the
element rods, T matches etc.
2. Assemble the two boom sections, be certain to match up the V half’s which are on the
ends of each boom section. Usually this is the only way they can go together. Sections are
marked VHF, UHF.
3. Mount the T matches this way: on the 2-meter end the feed point connectors go towards
the front of the antenna. On the UHF part, the forward T match is mounted with the
feedpoint connectors towards the front of the antenna, the rear T match has its feed point
connector towards the rear of the antenna (see pics on our website)
4. Mount the element rods. The longest rod is the reflector, the Driven Element is the
¼" dia. The element rods mount in descending order of length with the reflector being
the longest, Install the nuts as you go. Just snug them, do not apply a lot of torque as
it is not necessary. Use wrenches if necessary but just snug them only.
5. Slide the shorting bars onto the T match rods and driven elements. Set the distances as
follows for lowest SWR:
2 Meter part: 3 ¼"
70CM part: All the way out (this is the setting for other brands of UHF antennas as
The above distances are measured from the inside face of the shorting bars to the end of
the T matchbox, not the end of the black bushing.
6. Install the boom to mast plate just behind the last 2-meter element and in front of the
second 2-meter T match. Can hold the antenna at a 15 degree angle (recommended if you do
not have and elevation rotor). The V clamps V parts butt against the mast.
7. Install the phasing cables. We recommend looking at the pictures on our website to see
how they install. Be certain to deep any cables away from element rods, as that will
detune the antennas. Never allow a cable to run parallel to an element rod.
Date: Fri, 28 Feb 20 21:32:01 +0000
From: Luciano Gasparini <nachif(a)terra.com.br>
To: AMSAT-NA BB <amsat-bb(a)amsat.org>
Subject: [amsat-bb] Gulf Alpha Antenna Manual
Some years ago I bought a Gulf Alpha 2m/70cm antenna from the factory.
I never had the proper location to assemble it until recently.
Unfortunately, I cannot find the manual for the above.
Could someone help me, please?
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