EMRFD Message Archive 12872
Message Date From Subject 12872 2016-05-22 04:42:44 Ravi Miranda Crystal Filters - IF module I was wondering if the filter modules are available in the UK at a reasonable price? Or am I looking at building my own sets of filters from discrete crystals? Discrete build would mean a considerable amount of testing and impedance matching I suppose, not much test gear with me at the moment.For the OSC section I intend to use a Si5351 and a PIC. the PIC would also control the display and the TV tuner i2C.This will follow the downconversion of a TV tuner, so that I can listen in to AM, CW, SSB etc.I am considering building this IF module here:Hello everyoneTrust you are having a great weekend.
http://www.ve7ca.net/Hbr200.htm#IFDetWhat do you think?Have a happy Sunday.Ravi/M0RVI
--I'm here to add more value to the world than I'm using up.
12875 2016-05-23 08:42:07 Graham / KE9H Re: Crystal Filters - IF module Ravi:I think the problem may be the "TV Tuner".TV tuners are designed to work with signals that are perhaps 6 MHz wide.As such they have stability and phase noise specifications that are suitable for wide signals, but provide disappointing performance when used with very narrow signals like SSB or CW.--- Graham / KE9H==