MFJ MFJ-752D Instruction Manual Download Page 8

 

FULL 12-MONTH WARRANTY 

MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, 
Inc.  and  purchased  from  an  authorized  dealer  or  directly  from  MFJ  Enterprises,  Inc.  to  be  free  from 
defects  in  material  and  workmanship  for  a  period  of  12  months  from  date  of  purchase  provided  the 
following terms of this warranty are satisfied. 

 

1.

 

The  purchaser  must  retain  the  dated  proof-of-purchase  (bill  of  sale,  canceled  check, 

credit  card  or  money  order  receipt,  etc.)  describing  the  product  to  establish  the  validity  of  the 
warranty claim and submit the original or machine reproduction of such proof of purchase to MFJ 
Enterprises, Inc. at the time of warranty service.  MFJ Enterprises, Inc. shall have the discretion to 
deny  warranty  without  dated  proof-of-purchase.    Any  evidence  of  alteration,  erasure,  of  forgery 
shall be cause to void any and all warranty terms immediately. 

 

2.

 

MFJ  Enterprises,  Inc.  agrees  to  repair  or  replace  at  MFJ's  option  without  charge  to  the 

original  owner  any  defective  product  provided  the  product  is  returned  postage  prepaid  to  MFJ 
Enterprises,  Inc.  with  a  personal  check,  cashiers  check,  or  money  order  for 

$12.00 

covering 

postage and handling. 

 

3.

 

MFJ Enterprises, Inc. will supply replacement parts free of charge for any MFJ product 

under  warranty  upon  request.    A  dated  proof  of  purchase  and  a

  $8.00

  personal  check,  cashiers 

check, or money order must be provided to cover postage and handling. 

 

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 

owner's cabinet or connected to switches, jacks, or cables, etc. sent to MFJ Enterprises, Inc. will 
be returned at the owner's expense un-repaired.   

 

7.

  

Under  no  circumstances  is  MFJ  Enterprises,  Inc.  liable  for  consequential  damages  to 

person or property by the use of any MFJ products. 

 

8.

 

Out-of-Warranty  Service: 

MFJ  Enterprises,  Inc.  will  repair  any  out-of-warranty 

product  provided  the  unit  is  shipped  prepaid.    All  repaired  units  will  be  shipped  COD  to  the 
owner.  Repair charges will be added to the COD fee unless other arrangements are made. 

 

9.

 

This warranty is given in lieu of any other warranty expressed or implied. 

 

10.

 

MFJ  Enterprises,  Inc.  reserves  the  right to make changes or improvements in design or 

manufacture  without  incurring  any  obligation  to  install  such  changes  upon  any  of  the  products 
previously manufactured. 

 

11.

 

All  MFJ  products to be serviced in-warranty or out-of-warranty should be addressed to 

MFJ Enterprises, Inc., 300 Industrial Park Rd, Starkville, Mississippi 39759, USA 

and must 

be accompanied by a letter describing the problem in detail along with a copy of your dated proof-
of-purchase and a telephone number. 

 

12.

 

This warranty gives you specific rights, and you may also have other rights, which vary 

from state to state. 

 
 
 

Rev 04/08/2011 

Summary of Contents for MFJ-752D

Page 1: ...UAL CAUTION Read All Instruction Before Operating Equipment MFJ ENTERPRISES INC P O BOX 494 MISSISSIPPI STATE MS 39762 USA 925 0037D 752D REV 1 COPYRIGHT 2010 MFJ ENTERPRISES INC MFJ SIGNAL ENHANCER II Model MFJ 752D ...

Page 2: ...ceiver or receiver to the MFJ 752D Use an RCA phono plug to connect to the filter input There are two inputs on the MFJ 752D allowing connection to two receivers for greater convenience The input is selected by the push button switch on the back of the MFJ 752D 3 Connect a speaker to the filter using shielded wire with a RCA phono plug at the filter speaker output For best results use a 4 to 16 oh...

Page 3: ...he NOTCH filter is approximately 70 dB Notch frequency is adjustable from approximately 300 Hz to 3000 Hz The primary notch filter can be set to the NOTCH mode by setting the Function Selector to NOTCH Set SELECTIVITY control to the 9 o clock position Adjust FREQUENCY control to remove the CW signal or heterodyne Increase SELECTIVITY clockwise to narrow the bandwidth of the notch Readjust FREQUENC...

Page 4: ...eration It can be used to obtain very narrow bandwidths with good skirt selectivity and little ringing when the primary filter is in the peak mode or to limit the bandwidth when the primary filter is in the NOTCH LOW PASS or HIGH PASS mode NOTE When using both filters in the PEAK mode with narrow bandwidths the best skirt selectivity and least attenuation will be obtained by setting both the auxil...

Page 5: ... and turn the SELECTIVITY and FREQUENCY controls to minimum counter clockwise 2 With high selectivity the filter may have a tendency to ring in peak and lowpass modes If this occurs decrease the selectivity 3 Due to the very high internal filter gains in the LOW PASS mode with maximum selectivity and frequency the filter may OSCILLATE If this occurs reduce SELECTIVITY and FREQUENCY controls until ...

Page 6: ... 1V p p and adjust generator frequency control s for a null minimum amplitude Null should occur at about 3000 Hz 4 Switch Primary Function Selector to PEAK 5 Increase Primary SELECTIVITY control to maximum 6 Adjust R319 10K High Tracking trimmer for maximum amplitude 7 Set generator frequency to 500 Hz 8 Set primary SELECTIVITY control to 3 o clock 9 Set primary filter to NOTCH and adjust primary ...

Page 7: ...6 MFJ 752D Schematic Diagram ...

Page 8: ...is 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 owner s...

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