Gwyn, Are you really meaning a R4B? I am fairly sure that the B series RX has an LC circuit in the 60Khz range for its selectivity. I didn't think the RX had xtal filters till the C series. 73, Ron WD8SBB
--- On Sun, 7/18/10, Griffiths G. <[email protected]> wrote: From: Griffiths G. <[email protected]> Subject: [Drakelist] R4B xtal filter bandwidth problem To: "[email protected]" <[email protected]> Date: Sunday, July 18, 2010, 4:47 AM Folks Does anyone have experience of the R4B as-fitted xtal fliter showing a -3dB bandwidth of just 250Hz, from 5644.910 to 5644.660kHz This suggests to me that only one crystal is in circuit, but I do not have the circuit of what is in the can so I can be sure. Is there a circuit available? Before I dismantle, suggestions welcome as to any other diagnostics I can do. many thanks 73s, Gwyn Griffiths G3ZIL _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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