ATR-30 Instruction Manual
Ameritron Antenna Tuner
8
To avoid problems matching or feeding any dipole antenna with high impedance open wire lines, keep
the lines around the length below. The
worst possible
line lengths are shown in brackets:
160 meter dipole 40-70 or 150- 190 feet suggested
[Avoid lines around 120 or 240 ft]
80 meter dipole 25-40, 80-100 or 140-160 feet
[Avoid lines around 60, 120, or 180 ft]
40 meter dipole 40-50, 70-80, 100-110 or 130-140 feet [Avoid 30, 60, 90, 120 ft]
Some slight trimming or additional feedline may be necessary to accommodate the higher bands.
WARNING: To avoid problems, a dipole antenna should be a full half-
wave on the lowest band. On 160 meters, an 80 or 40 meter
dipole antenna fed like a normal dipole will be extremely
reactive with only a few ohms of feedpoint resistance.
Trying to load an 80 meter half-wave (or shorter) dipole
antenna on 160 meters can be a disaster for both your signal
and the tuner. The best way to operate 160 meters with an 80
or 40 meter dipole antenna is to load either or both (in
parallel) feedline wires as a longwire or ‘‘T’’ antenna. An
antenna connected like this and worked against a very good
RF ground will produce a very good 160 meter signal.
7.0 TECHNICAL
ASSISTANCE
If you have any problem with this unit first check the appropriate section of this manual. If the manual
does not reference your problem or your problem is not solved by reading the manual, you may call
Ameritron
at
601-323-8211
. You will be best helped if you have your unit, manual and all information
on your station handy so you can answer any questions the technicians may ask.
You can also send questions by mail to Ameritron, 116 Willow Road, Starkville, MS 39759; by
Facsimile (FAX) to 601-323-6551. Send a complete description of your problem, an explanation of
exactly how you are using your unit, and a complete description of your station.
Summary of Contents for ATR-30
Page 9: ......
