Labels:book | bulletin board | reckoner | sky OCR: KENWOOD ASB 1024 Service Bulletin Amateur Radlo Divislon Subject: TS 950S/SD Transmit Spur Date: May 1993 Symptom: transmitter spur might be present ata dit ofXX X1 MHz This spur o +/1 kHzis quite small -55dB relative to fbut might become noticeable when the transceiver is used with a linear amplifier Cause: The transmitted signal enters pin 5 of IC11 which in the last PLL loop in the AF unit due to RF feedback This pin is the input for the 10 MHz Ref Osc signal from the CAR unit. 1011 is the source of the spurious signal since both the band and 10 MHz frequencies are by the 500 kHz comparison freguency supplied bvIC11 Corrective Action: To reduce this RF feedback increase the Ret Osc level from .2Vto .7V ms by adding the accompanying circuit to the input ofC11 Parts Required: Qty Descript ...
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