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Brian Whatcott
shared these priceless pearls of wisdom: -If we are going to brain-storm it, let's dump the relays in favor of -SSRs (that can be had in sizes less than a finger nail in real -estate.) Finding a SSR that will handle 10 watts is difficult. Finding a SSR that will be relatively loss-free at 137 MHz. is more difficult. Finding a SSR that will do both is difficult in the extreme. - -Let's by all means add fifty cents of security with back to back -diodes to limit receiver input excursions to 0.6 volts or less. At that sort of forward current, the excursions will be more like a volt. And, those diodes have a burnout mechanism also. - -Come to think of it, how hard could a functional isolator be? -They've been around for sixty years. But wait: its the bandwidth that -makes those tuned things less practical - great isolation midband, but -skanky at the band-edges. You are kidding, no? A ferromagnetic isolator at 127 MHz. would be about the size of a computer printer and weigh something on the order of a small child. Jim Jim Weir (A&P/IA, CFI, & other good alphabet soup) VP Eng RST Pres. Cyberchapter EAA Tech. Counselor http://www.rst-engr.com |
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