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UPD858 SSB XMIT RF Amplifier circuitry problems

Im having some issues troubleshooting the whole XMIT circuit of my ROBYN UPD858 board radio. Please refer to the attachment for the discussion and the possible solutions. The transmitter section as I understand it starts with a mixer (FET7) which output is the 27MHz sample to be amplified...
- WP4AFB
- Thread
- May 24, 2021
- Replies: 13
- Forum: CB Radio Modifications

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