General Category > Amateur Radio

Project IC-R71A

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Josh:
And in other news,  Project IC-R71A is currently having a contest to see what detector circuit to best replace the time-tested single diode detector with, and you are NOT invited to participate. Many types are worthy of consideration, "high precision, infinite impedance, pll, synchrodyne (poor mans synchronous), synchronous, in analog or digital renditions! Beers will be consumed! Eskab and Edvis (who doesn't remember those guys?) used to make a PLAM (Phase Locked AM) board for the R70 and R71A, would be nice to find but doubt any loose on the market right now would fall under the current funding guidelines. A look at the am stereo chip used in the Sony  2010 might be a good idear. I know you only get circa 6kc of am audio bw, and it IS an Icom after all, but those 6kc can be glorious if you set your mind to it despite all efforts to make you see the light.

Recently the R71A was submitted to pll/vco alignment and it passed with a few caveats - all ranges were out a few tens of volts, one being an visually suspect heat damaged part, the expert inspection/evaluation will have to await the New Year due reasons of being sick of my projects.

Also looking for an FL-96 2.8kc wide 455kc IF xtal filter for excellent bespoke pass band tuning as well as outstanding matched filter performance when that filter set is selected.






Next time you quaff a Guinness think kindly of the R71A.

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