UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Improving Selectivity In Vintage Receivers

Bazz4CQJ · 4th Dec 2022, 2:03 am

I respect your knowledge/expertise much too much to argue with you; the crystals are not there but have been replaced by ceramic filters and anecdotal accounts (of the QST original configuration) say these give "useful" performance.

This is backed up by Peter's account (on this forum and in his BVWS article) of his trial of the ceramics in an HRO. On that basis, the question is whether my proposed circuit has any obvious flaws, other than "lacking the quartz"?

Now, if I change the IF to 8.1MHz, my junk box certainly has a number of FT243 quartz crystals

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B

4th Dec 2022, 2:03 am	#82
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,935	Re: Improving Selectivity In Vintage Receivers I respect your knowledge/expertise much too much to argue with you; the crystals are not there but have been replaced by ceramic filters and anecdotal accounts (of the QST original configuration) say these give "useful" performance. This is backed up by Peter's account (on this forum and in his BVWS article) of his trial of the ceramics in an HRO. On that basis, the question is whether my proposed circuit has any obvious flaws, other than "lacking the quartz"? Now, if I change the IF to 8.1MHz, my junk box certainly has a number of FT243 quartz crystals . B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch.