AMERITRON ATR-20 Gebrauchsanweisung - Seite 8

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ATR-20 Instruction Manual

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

80 meter dipole 25-40, 80-100 or 140-160 feet

40 meter dipole 40-50, 70-80, 100-110 or 130-140 feet

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.

dipole antenna fed like a normal dipole will be extremely

reactive with only

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.

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 662-323-8211. 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 662-323-6551. Send a complete description of your problem, an explanation of

exactly how you are using your unit, and a complete description of your station.

[Avoid lines around 120 or 240 ft]

[Avoid lines around 60, 120, or 180 ft]

[Avoid 30, 60, 90, 120 ft]

On 160 meters, an 80 or 40 meter

few

ohms of feedpoint

Ameritron Antenna Tuner

resistance.