On Friday, February 17, 2012 07:07:39 PM Fons Adriaensen did opine:
> On Fri, Feb 17, 2012 at 12:32:01PM -0500, gene heskett wrote:
But at a 60 ohm impedance, that capacitance is considerable. I could put
20 volts P-P into a cable headed for our news dept, at say 15 kilohertz,
and 200' away, I could only see 6 or 7 volts.
> And yes you need hefty line
And often sensitive to both crossover distortions and slew rate limits, one
of the reasons I built a DA card years ago, 2 channel in 4 out each
channel, and used TLO84's for all of it. I was replacing a rig that had
heat sinked TO-5 bugs in it that had both crossover and slew rate limits
much worse than the near gain of 1 op amps had at half the output P-P.
Those were also a home brewed copy of something one of my employees made
before I came in the door in '84, and in my attempts to build a working
television station, that problem finally filtered itself to the top of the
must do list about a year later.
The biggest problem with the TLO84's was that those long cable runs made
excellent antennas for EMP's, which caused then to self destruct in bags
full every time the STL tower, a 255' pyrod self supported tower about 20
feet outside the back door, got tapped by a wandering lightning strike, so
I had to keep TLO84's around in 3 stick quantities, but TLO84's are dirt
cheap. The lightning strike was a many times annually event when you have
255' of steel sticking up.
Likewise Fons, have a good evening.
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