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MFJ MFJ-931, Инструкция по эксплуатации, Страница: 5 / 5

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MFJ-931 Instruction Manual

Artificial RF Ground

Installing a ground in the wrong fashion, such as mistuning and bad connections, can also
generate additional RFI. Harmonics and loss of signal strength can be the result. Energy outside
the band may become great enough to radiate into the commercial radio and TV bands.
Installing a low pass filter, such as the MFJ-704, will provide additional suppression of the out-
of-band signal.

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 

MFJ Technical Service 

at 

662-323-0549 

or the 

MFJ Factory 

at 

662-323-5869.

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 MFJ Enterprises, Inc., 300 Industrial Park Road,
Starkville, MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to

[email protected]

. Send a complete description of your problem, an explanation of

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

Содержание MFJ-931

Страница 1: ...wire to the red binding post labeled To Counterpoise Wire or Ground Connection Wire on back of the MFJ 931 Be sure not to reverse these wires The random wire should be a quarter wave length or less at the operating frequency Be sure to throw the random wire along the floor and to tape up the open end of the wire to avoid RF burn To obtain maximum RF ground current for a low impedance RF ground alt...

Страница 2: ...ner side by side or one on top of the other to insure the ground of each are as close to each other as possible Connect your existing ground wire to the red binding post labeled To Counterpoise Wire or Ground Connection Wire on the back of the MFJ 931 Do not reverse these wires After making these connections follow the same procedure for maximizing RF ground current as described in the Creating Ar...

Страница 3: ...velength difference in frequency which should show some ground current In the case of a halfwave antenna the meter is not usable for measuring ground current so it is very difficult to tune the artificial ground You may use a field strength meter such as the MFJ 812B to tune the ground for maximum radiated signal This also means that the receiving station S units will go to maximum for this antenn...

Страница 4: ...ver of mirror placed on only one side of the candle would give an increase only in that direction A ground plane underneath a HT rubber ducky will tremendously increase radiated field strength from the radio Radio Frequency Interference In may cases providing an adequate ground to the antenna system will reduce or stop unwanted radiation outside the operating frequency Harmonics can be directed to...

Страница 5: ...k 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 MFJ Technical Service at 662 323 0549 or the MFJ Factory at 662 323 5869 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 questi...

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