SDRplay Community Forum

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Hi Ian, I modestly and politely call your attention to the fact that, if three of your posts went wrong, perhaps some responsibilty should be placed at your door. In a Forum, in any Forum, which as you rightly say, is there to help, if somebody propagates fake information (the equivalent of nowadays...

3.5 WIDE BAND PRE-SELECTORS - LOW PASS FILTER TABULAR DATA Low pass filter tabulated data is available from many sources. Uploaded below the C 03 50 table, taken from Reference 1, the most complete I have seen, where the data used for the 3.65 bandpass filter has been taken from. Partial data can a...

Oh, Mike, forgot to mention I have been a member of IEEE for most of my professional life and presented my first paper on Vehicular Communications at the IRE (it was so called then) Convention of November 1966 in Montreal, Canada. Was aged 26 then, memories of long past glory....With sympathy, glovi...

Mike, with sympathy, this is and has has always been the problem of many guys involved in Electronics (and in other disciplines as well!): they tend not to think with their own head, but lend their brains to others, refusing even the minimum effort to understand, probably because they do not have th...

Hi guys, You can take a liter of water, beat it in a mortar for as long as you like, but in the end, what have you got ? Only water (in reality my professor of physics at the university was using another material for this example). This is the impression the article on "small antennas" Mike referenc...

3.4 WIDE BAND PRE-SELECTORS - FIXED BANDPASS FILTERS @ 3.8 MHz - DUAL PROTOTYPE PRACTICAL IMPLEMENTATION The Cauer low pass filter prototype comes in two versions: the shunt input version shown in Figure 4 and the series input version, where a shunt capacitor is replaced by a series inductor and th...

3.3 WIDE BAND PRE-SELECTORS - FIXED BANDPASS FILTERS @ 3.8 MHz - PRACTICAL IMPLEMENTATION Figure 5 below shows the detailed practical implementation of the 3.65 MHz pre-selector, with air core coil technology, compared to Powder Iron toroid technology. At this frequency, due to the higher Qu's, Pow...

3.2 WIDE BAND PRE-SELECTORS - FIXED BANDPASS FILTERS @ 3.8 MHz It should be evident that all data & calculations shown in the previous Figures 1 to 3 come from an Excel spreadsheet. Unfortunately I can only post pics of Excel, as the Forum software does not allow me to post the Excel file, otherwis...

3.1 WIDE BAND PRE-SELECTORS - FIXED BANDPASS FILTERS @ 3.8 MHz In this post we are going to look at another alternative: build a fixed pre-selector protecting the entire 80 band, 3500 to 3800 KHz. The design procedure is based on the transformation of a Cauer Low Pass prototype into its bandpass eq...