Thanks Gary!! Rick -
What you describe is NORMAL operation...... When the receiver switch is set to ON, the receiver is ON! Regardless of any other setting. Likewise, when the receiver is set to EXT MUTE, it is capable of being muted externally! Obviously if you want to use the Noise Blanker or the Calibrator, you want the receiver to be ON, so those choices also need the ON condition. This is why a shorted plug must be installed in the MUTE jack on the rear panel to use the receiver as a 'standalone' unit and continue to have access to the NB and CAL functions. Your #4 is confusing. You say you disconnected the _receiver_ end of the MUTE cable, and then describe cable resistance checks related to various _receiver_ switch positions. If you measure the receiver MUTE connector, it will be grounded in ON, and a negative voltage in EXT MUTE, NB or CAL. The transmitter MUTE connector should read shorted when the transmitter is in standby, and OPEN when in transmit. The MUTE function operates as follows: When the _transmitter_ is in RECEIVE mode, (the relay is open,) the MUTE line in the transmitter is grounded by a set of relay contacts. This ground is therefore applied to the MUTE connector of the receiver, via the MUTE cable. When the receiver MUTE jack is grounded by this connection, the receiver is in normal operation. IF the FUNCTION switch is set to ON, the receiver operates normally without regard to the MUTE jack being grounded or not. When the transmitter is in any TRANSMIT mode, the MUTE line is 'open' (NOT grounded) in the transmitter. This 'open' is carried to the receiver MUTE connector by the cable, and if the receiver FUNCTION switch is in EXT MUTE, NB or CAL, the receiver will be muted, and the AVC line will go to maximum to cut off the RF/IF stages. The S-Meter WILL to to full scale. You describe the transmitter as 'working', which is ONLY possible if the relay has pulled in. It's a small relay but should be quite audible. Sometimes it's masked by the click of the switch detent. So unless I'm misreading your question(s), it sounds like if you put the receiver in the EXT MUTE, NB or CAL positions that it IS being muted and the system is operating as expected. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs Gary Winblad wrote:
Rick, Garey's description is very good, except one "typo" > The transmitter MUTE connector should read OPEN when the transmitter is in standby, and >shorted when in transmit. Should be: The transmitter MUTE connector should read SHORTED when the transmitter is in standby, and OPEN when in transmit. It sounds to me that your transmitter is stuck in transmit. OR you DO have a relay/circuit problem in the transmitter. The receiver is working right. Gary WB6OGD
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