I've always kind of wondered about this ? I've been around the hobby/business for getting on 20 years now.Mr first tech was taught by another tech (whoever taught him ? I have no clue) as far as I knew at the time ,he did a good job but then again I only had very little understanding of how it all worked to begin with.(still don't)He had no special Awards or certificates or anything like that on his walls, he did have a scope and all the other special equipment that "techs" use ,but it looked like to me that he more so used a Bird and a Dosy for the quickie tuning of radios ? ....then there came my second "tech" he at first was a t.v. repair man who saw that he could make money with amps and radios ,again.he had all the right equipment but yet ,more so then not ,he to would only use a Bird/dosy meter for tuning radios for the most part.(I haven't a clue who taught or teached him this stuff either) Then there was another "tech" he had been taught by my first "tech" (had started his own business which pissed off the first "tech") again ,he had all the right tools but yet he too only used a Dosy for the most part when it came to tuning radios ? Hmmm ? Now in the last few years or so I've met a few more "techs" the first one was taught at the ripe age of 13 (he's now 30) by a now retired "tech" and folks just basically call him a quack, no certificates or awards on his walls either, this one does seem to use his scope more so then not but the Bird is always there and I honestly don't see a dosy anywhere in site (IM guessing this might be a good thing) then there were a few other "techs" I have met and they too were taught by others on down the line and also had no certificates on the walls and or special awards. Just truly makes me wonder what is the differents between a quote on quote certified radio "tech" and what one would call a "Hack" ? Maybe the truly certified ones are the ones that design the radios in the first place are the real "tech" and chances are your not going to find them down at your local Flying J's or working out of some mobile home or some store front hole in the wall ? So I ask you's that just may know the answer to my question ....What is the differance between the two ?