5/26/2023 0 Comments Drake ps7 service manual![]() The existing +ve conductor thus being used to supply the PA only. At G4ALG the strap between the two +ve connectors in the CD plus of the PS7 was removed and a seperate -ve wire run to the PS7 for the low current 13.6v rail. This showed up as a fluctuation in panel light brightness and foldback on the receive audio line. When transmitting full power Single sideband (SSB) it was found that supply ripple was occurring on the 13.6vDC to the TR7 due to a voltage drop across the two core supply leads on speech peaks. 0.1uF 100v capacitor across headphone jack J11Ī 0.001uF 200v capacitor was wired across the key jack.Ī 0.1uF 100v capacitor was wired across the 'AUX DC' jack in the power supply, PS7.0.1uF 100v capacitor across external speaker jack J12.0.1uF 100v capacitor across speaker terminals.As a result, the following decoupling was provided: ![]() Under transmitter test into a dummy load a small amount of RF pickup was found on the receive audio output wiring.
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