Direct FM

  
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For this project the 1 1/4 meter Midland 13-509 ischosen, mainly because it`s use in several (transparent) links, which support the SRG 147. 20 repeater. First strip out several items not needed or otherwise to improve reliability and performance. That would include the T-R relay, the receiver deck, most or all of the trimmer capacitors for the transmitter and
Direct FM - schematic

(now gone) receiver. These open slots can be used for transmitter control circuits, explained further on.



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