From: utzoo!decvax!harpo!ihps3!ihuxx!ignatz
Newsgroups: net.followup
Title: Re: RFI & Terminals
Article-I.D.: ihuxx.223
Posted: Mon Nov  1 14:28:57 1982
Received: Tue Nov  2 04:53:23 1982
References: eagle.573 watmath.3754

	Golly, mentioning the TI calculator interference brings back memories.
Surely I'm not the only one who remembers that the HP-35 would affect an AM
radio on a per-keystroke basis?  This little beast actually produced 'notes'
that were clean enough to play tunes.  My HP-45 did this as well, but the tones
were not discrete enough to play tunes. However, you could--and I did--use this
to tell when a program was done!  While running a program, you also had an
increase in generated noise; when the program was done, the output level went
down.  I could even tell when it was in loops...
	Incidentally, this was never resolved to my satisfaction, but I think
the EE's said they thought that the calculator was affecting the IF, not the
primary frequencies...
~a
~v
(sheesh.)
				Dave Ihnat
				ihuxx!ignatz