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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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asb0004.txt
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1997-02-01
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==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
Kenwood Service Centers
Kenwood Service Corporation Kenwood Service Center, East
2201 East Dominguez Street 829 Lynnhaven Parkway, Suite 130
Long Beach, California 90801 Virginia Beach, Virginia 23452
Telephone 1-310-639-5300 Telephone 1-804-340-1702
==============================================================================
BULLETIN # 4
MODEL: TS-520
SUBJECT: AM BROADCAST INTERFERENCE
WE HAVE FOUND A FEW INSTANCES OF CUSTOMERS WHO LIVE NEAR AN AM BRADCAST
STATION HEARING THAT STATION ON THE 3.5 MHZ BAND OF THEIR TS-520. SHOWN
BELOW IS A FILTER THAT MAY BE INSTALLED IF THIS OCCURS.
|------------------------------|
| RF UNIT |
| NAT |---
| GND |- |
| ---------------| |
| | |
|---------------| |
|
|
L1-C1 (ADD IN LINE)
|
|
TO <------------------|
S-9
A SUGGESTED LOCATION FOR THE FILTER IS ON A SMALL TERMINAL STRIP THAT IS
THEN MOUNTED ON A MOUNTING SCREW OF THE RF UNIT. THIS SCREW IS LOCATED
AT THE FRONT CORNER NEXT TO THE VFO. THE CABLE BETWEEN S-9 (WWV SWITCH)
AND TERMINAL -NAT- OF THE RF UNIT IS REMOVED FROM TERMINAL NAT AND CONNECTED
TO ONE SIDE OF THE FILTER. A SHORT PIECE OF RG-174U IS THEN CONNECTED FROM
THE OTHER SIDE OF THE FILTER TO THE TERMINAL -NAT-.THIS SHOULD PREVENT THE
AM BROADCAST INTERFERENCE.
COMPONENT VALUES ARE AS FOLLOWS:
FREQ. L1 C1
1300 KHZ 22 UH 680 PF
1000 KHZ 100 UH 220 PF
700 KHZ 100 UH 470 PF