MFJ VersaTuner III -962D Instruction Manual Download | Manualshive

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MFJ-962D Instruction Manual

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DISCLAIMER

Information in this manual is designed for

user purposes only

and is

not

intended to supersede

information contained in customer regulations, technical manuals/documents, positional handbooks, or

other official publications. The copy of this manual provided to the customer will

not

be updated to

reflect current data.

Customers using this manual should report errors or omissions, recommendations for improvements, or

other comments to MFJ Enterprises, 300 Industrial Park Road, Starkville, MS 39759. Phone: (662) 323-

5869; FAX: (662) 323-6551. Business hours: M-F 8-4:30 CST.

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Summary of Contents for VersaTuner III -962D

Page 1: ...Before Operating Equipment COPYRIGHT 2013 MFJ ENTERPRISES INC C Model MFJ 962D VERSION 5B MFJ ENTERPRISES INC 300 Industrial Park Road Starkville MS 39759 USA Tel 662 323 5869 Fax 662 323 6551 Requires 9VDC Battery or 12VDC Source for Meter Operation ...

Page 2: ...s documents positional handbooks or other official publications The copy of this manual provided to the customer will not be updated to reflect current data Customers using this manual should report errors or omissions recommendations for improvements or other comments to MFJ Enterprises 300 Industrial Park Road Starkville MS 39759 Phone 662 323 5869 FAX 662 323 6551 Business hours M F 8 4 30 CST ...

Page 3: ...peak power input and not the true RF power output For example the one thousand watt Johnson Matchbox was rated to handle a 1000 watt plate modulated AM transmitter four kilowatts PEP transmitter input and 3000 watts PEP RF output The Heathkit SB 220 was called a two kilowatt amplifier and the rated CW output was approximately 600 watts Matching tuners were called 2 kilowatt tuners and these tuners...

Page 4: ...it in or out of line The wattmeter can be used without the tuning network by setting the ANTENNA SELECTOR to either of the two COAX DIRECT positions of the antenna selector The wattmeter is active in all positions of the ANTENNA SELECTOR The meter s full scale forward and reflected power range is controlled by the left POWER switch that selects 2000W HI or 200W LO If your transmitter runs more tha...

Page 5: ...er should be subtracted from the forward power readings The SWR is read directly from eleven red SWR curves that range from 1 1 to infinity SWR is measured by observing the point where the forward and reflected power needles cross The SWR is indicated by the red curve closest to the needle crossing point No cumbersome or time consuming SWR sensitivity adjustments are required with this meter The w...

Page 6: ...elow Use a coaxial cable such as RG 8 U to connect the transmitter or amplifier to the connector marked TRANSMITTER on the rear of the tuner 3 Connect the antenna s to the tuner as follows A Coaxial feedlines connect to the coax connectors 1 and 2 coax line fed direct or through matching circuit as selected by the ANTENNA SELECTOR switch B Random wire or single wire line antennas should be connect...

Page 7: ... be accomplished by placing the ANTENNA SELECTOR switch in the fully clockwise BYPASS DUMMY LOAD position Adjust the transmitter according to the manufacturer s instructions into the 50 ohm dummy load before adjusting the tuner Most modern solid state transceivers do not require adjustments If the transceiver has a built in antenna tuner be sure it is turned off or disabled After properly preparin...

Page 8: ...lected power and maximum forward power lowest SWR 5 In this order adjust the ANTENNA control INDUCTOR and TRANSMITTER control for lowest reflected power and SWR Repeat this step a few times until the reflected power is zero 6 If the SWR did not reach 1 1 in step 5 turn the INDUCTOR control counter clockwise to a lower number again and repeat Step 5 For maximum power handling and efficiency always ...

Page 9: ...ons may have high voltage while being used 4 Disconnect all antennas from the tuner during lightning storms 5 Always tune with low power i e less than 100 watts Apply maximum power only after tuning up 6 Be sure to adjust the SWR before transmitting at high power above 100 watts Do Not transmit with a high SWR for extended periods of time In Case Of Difficulty If the tuner fails to tune please dou...

Page 10: ... best RF grounds are radial systems or multi wire counterpoises Radials and counterpoises provide large low resistance surfaces for RF energy RF and lightning travels on the surface of conductors Braided or woven conductors have high surface resistance to lightning and RF Ground leads for RF and lightning should have wide smooth surfaces Avoid the use of woven or braided conductors in RF and light...

Page 11: ...rcing and heating The following suggestions will reduce the difficulty in matching an antenna with a tuner 1 Never center feed a half wave multi band antenna with a high impedance feedline that is close to an odd multiple of a quarter wave long 2 Never center feed a full wave antenna with any feedline close to a multiple of a half wave long 3 If this tuner will not tune a multi band antenna add or...

Page 12: ...s button pushed out for the 300 Watt scale Transmit 100 Watts as indicated on the reference meter Adjust the LO FWD trim pot to set the forward power scale to 100 Watts 5 With the 3000 300 Watts button pushed in for the 3000 Watt scale Transmit 1000 Watts as indicated on the reference meter Adjust the HI FWD trim pot to set the forward power scale to 1000 Watts 6 To set the reflected power interch...

Page 13: ...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 techinfo mfjenterprises com Send a complete description of you...

Page 14: ... below to log values for your station You may want to copy this chart and post it by your tuner Frequency MHz Transmitter Inductor counter indicator Antenna 1 8 1 8 2 0 2 0 3 5 3 5 3 5 3 75 3 75 3 75 4 0 4 0 4 0 7 15 7 15 10 1 10 1 14 2 18 1 18 1 21 2 21 2 24 9 28 5 ...

Page 15: ...g 4 This warranty is NOT void for owners who attempt to repair defective units Technical consultation is available by calling 662 323 5869 5 This warranty does not apply to kits sold by or manufactured by MFJ Enterprises Inc 6 Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board product is returned Wired and tested PC boards installed in the o...

Page 16: ...MFJ 962D Manual Version 6 Printed In U S A 300 Industrial Park Road Starkville MS 39759 ...

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