Ten-Tec_RX-320D_DRM_update.pdf
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Ten-Tec_RX-320D_DRM_update.pdf
Service Directive #320-01 Product: RX320D Subject: DRM reception Date: June 3, 2003 Issue 1: Some users have experienced overload of their sound cards when using the RX320D for DRM reception under strong-signal conditions. Evidently, some sound cards cannot handle more than 1.8 V peak-to-peak without introducing distortion that destroys the integrity of received signals. Solution: Divide the IF output using two 1.2-k resistors. A cable (Ten-Tec PN 86086-A) having the resistors installed is available for field retrofit. Issue 2: Very strong DRM signals may produce degraded recovered signal-to- noise ratios. We have traced this issue to the analog AGC system. Solution: Change C81 from a 4.7 uF to a 33 uF capacitor. The 33 uF capacitor (Ten-Tec PN 23308) and a component-location diagram are available for field retrofit.
