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Leave it up to the ARRL to have an article about a device that is no longer used because it is obsolete.
Update: May 2018: It is now 17 years since the original HeyPhone was produced; designed and constructed for the UK Cave Rescue Groups by John Hey, who died in 2016. The HeyPhone was a pioneering development in Cave Radio, but it can no longer be recommended..."
"In a 2018 update, the British Cave Research Association (BCRA) Cave Radio & Electronics Group (CREG) HeyPhone Cave Rescue Communication page called the HeyPhone “a pioneering development in cave radio” that “can no longer be recommended..."
I guess they worked OK, but, ................what would have been said if they failed and those scouts died?
Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
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