Alpha Antenna Base Loop User manual

Page 1
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Model – Base Loop Version 2.0, November 11, 2021
Overview
The Base Loop is designed to operate from 10-40 meters, and is rated at 100W PEP SSB, 50W CW, or 10W digital.
Assembled – Base Loop
Operation
Included is the Remote Control pictured before, which has a Lighted power button, Speed control knob, and Left/Right
tuning buttons. WARNING –
Tuning
The following technique has proven to be the easiest method for tuning the Base Loop in nearly all scenarios:
1) Turn the Speed Control knob on the Remote control to the far right, which is the fastest tuning position.
2) Then use an inline SWR Meter, your rigs internal SWR meter, or analyzer to tune for the minimum SWR by
pressing and holding the Red or Green button on the Remote Control, but never press both at the same time.
Note 1 – The tuning speed will increase when the Speed knob is turned Right and decreased when turned Left.
Note 2 – You may to listen for the noise floor to peak, as an indication that your are close to a minimum SWR.
Tip– It takes approximately 40 seconds to tune from 40 to 10 meters with the Speed control knob turned right.
3) After performing step ‘2’, you can further tune the Base Loop by slowing the tuning speed by turning the Speed
Control knob to the left, which is a slower tuning position. Then tap either the Red or Green button till the SWR
on your rig’s internal meter, antenna analyzer, or inline SWR meter is as low as possible.
Excess RF Exposure Warning
In the United States, the Federal Communications Commission has established guidelines for human exposure to Radio
Frequency (RF) electromagnetic fields. The commission’s requirements are detailed in parts 1 & 2 of the FCC’s rules and
regulations {47 CFR, 1.1307(b), 1.1310, 22.1091, 2.1093}. It is the responsibility of the owner/operator of this device to
follow all applicable warnings and precautions regarding human exposure to RF fields. Additional references:
http://www.arrl.org/rf-exposure
Support Contacts
If you have questions about your antenna, please feel free to email us at [email protected]m

Page 2
Step
Assembly
as pictured on Page 1 ‘Assembled
–
Base Loop’
1
I
nstall
the
following
hardware
towards the top of your
1.25” O.D.
mast
with
2 included
U
-
bolts
.
2
Use a rubber mallet or hammer to
tap the
2 black poles into the
hardware labeled
‘
Center
’
and the 2 pieces of
hardware labeled ‘Horizontal’.
Install this on the mast about 15 inches below the hardware in Step 1 with the U-bolts.
3
Install the following hardware about 19” below the items in Step 2 with the included U-bolts.
4
Insert
the
following
small inner loop
in
to the bottom
slot of the hardware in Step 1
. Then
attach your coax
from your equipment to the included t-connector on the small inner loop.
5
Insert the
longer
coax to form the
outer loop into the top slot of the hardware in Step 1.
Then screw the outer
loop’s 2 PL-259 connectors into the SO-239 connectors on hardware in Step 3.
6
Connect the
remote
-
control
cable
to the 2 power poles
on the hardware in Step 3.
7
Connect the remote
-
control cable
to the 2 power poles on the
following
Remote Control that will be placed
at
your radio. Then plug the power supply into the same Remote Control unit.