43 lines
2.0 KiB
Plaintext
43 lines
2.0 KiB
Plaintext
SEARS ROADTALKER
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SSB BASE MOBILE
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There is lot of these out there. Poor Rejection but thet Talk Good
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Don't over-peak! They have a small Power Supply.
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CLARIFIER:
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1. Remove R303. This Dissables the Transmit Voltage.
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2. Follow Black wire from the Clarifier control and lift it at the
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point where it meets the Board and Ground it.
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3. Follow the GREEN wire from Clarifier Control to the point where
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it connects to (RD)
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4. Remove the GREEN wire at this point! and move it to the other side of the Board marked BB at the left Front of Board. This point is a Constant
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Source Voltage on Transmit & Recieve.
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5. Use a VHF Varactor found in TV Tuners or order a Super Diode
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which will give you good Clarifier Range! CHOKES are often to much for this Circuit and will not Allow Centering the Clarifier.
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FREQUENCY:
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1. Make or Buy The Diagrammed Switch and connect it to the SM5104
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aqs Diagrammed. Center Postion will be Normal, Up will give you 44-59, and
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Down will give you 60-99+.
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2. Raising pin 8 High will recover Channels 41-44.
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SWITCH: The Switch is DPDT Center off You can Get at Radio Shack! the Diode is
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a 1N4148 or Similar Diode.
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:------------> to Chip VCC+
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:-:-------:
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Neg side diode <-----o o-------> To pin 10
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: :
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: :
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: o o-----> + side of diode
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: :
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: :
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: o o-:-----> to pin 9
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-----------
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Negative side of diode goes to same pin as VCC+
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Positive side of diode goes to Center Pin Shown!
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CARL HENSON
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315 SUMMIT AVE.WEST
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SPRINGFIELD, IL. 62704
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(217) 523-0252ðýŪÿðÌyìe |