MOTM

hello troops
i think i might have something constructive to say (for a change:-)
following on from the VCA lin / log thing, i have a question:
on and off all evening i've been tarting around plumbing my motm (#100,
#120, #410 so far heh heh) into my Pulse Generator (military surplus jiggery
pokery) which works in some kind of bizarre decade scale - obviously. anyway
my question is this - using the random output of my motm#100 into the input
of any vco, even a Hz/V one (ish), I get a good old fashioned randomy sort
of sequence. plug this same random output intothe PG52B (pulse geny)  and i
get a strange and rather nice middle eastern tempered random output,
disimilar from a normal VCO. now then
1) am i mad
2) am i wrong in thinking that random x anything = still random (cos that's
what it seems)
3) did the RAF really design their V Bomber communications systems based on
some kind of gamelan scale (i'm in deep doo doo if this one's right)

cheers paulb (now i have to go build a pile of BNC to Jack cables...)

On Fri, 29 Oct 1999, Paul R Bower wrote:
> From: "Paul R Bower" <vulture.squadron@...>
> i think i might have something constructive to say (for a change:-)
> following on from the VCA lin / log thing, i have a question:
> on and off all evening i've been tarting around plumbing my motm (#100,
> #120, #410 so far heh heh) into my Pulse Generator (military surplus jiggery
> pokery) which works in some kind of bizarre decade scale - obviously. anyway
> my question is this - using the random output of my motm#100 into the input
> of any vco, even a Hz/V one (ish), I get a good old fashioned randomy sort
> of sequence. plug this same random output intothe PG52B (pulse geny)  and i
> get a strange and rather nice middle eastern tempered random output,
> disimilar from a normal VCO. now then
> 1) am i mad
> 2) am i wrong in thinking that random x anything = still random (cos that's
> what it seems)

Yes yer mistaken.. but it's an easy mistake to make. Since the random
output voltage swing probably isn't that high at max (uhm, 3v or so? I'm
just guessing) you might not really hear the difference between v/octave
response and v/hz response over such a small scale. The higher up on the
v/hz scale you get, the less linear it is, because it's an exponential
system. Dig? :) 

later
Andrew

-| Andrew Schrock | aschrock@... |-

In a message dated 10/29/99 4:08:49 PM, vulture.squadron@... writes:

>i have a question:
>on and off all evening i've been tarting around plumbing my motm (#100,
>#120, #410 so far heh heh) into my Pulse Generator (military surplus jiggery
>pokery) which works in some kind of bizarre decade scale - obviously. anyway
>my question is this - using the random output of my motm#100 into the input
>of any vco, even a Hz/V one (ish), I get a good old fashioned randomy sort
>of sequence. plug this same random output intothe PG52B (pulse geny)  and
>i
>get a strange and rather nice middle eastern tempered random output,
>disimilar from a normal VCO. now then

This sounds very interesting! I suggest you let Paul take a look at it so he 
can build a similar module -- advertise it as "sounds from Vulcan," everyone 
will think it means Star Trek.

>1) am i mad

Possibly!

>2) am i wrong in thinking that random x anything = still random (cos that's
>what it seems)

Well, zero times anything is zero, but zero volts in your CV input won't 
produce zero Hz at the output -- but your basically right.

>3) did the RAF really design their V Bomber communications systems based
>on
>some kind of gamelan scale (i'm in deep doo doo if this one's right)

There was a thread about 6 mos. ago about the military being interested in 
the MOTM 300 -- maybe the NATO has a wacky EM group similar to all those 
marching bands that all the services seem to have!

Where did you get a pulse generator from a Vulcan bomber -- you didn't buy 
form a guy named Blofeld at some tech swap meet did you?

JB
BTW: I recently saw the first Austin Powers movie and I believe that the 
voice of Dr. Evil is Mike Myers imitating an Englishman imitating an 
American.

>From: JWBarlow@...

>This sounds very interesting! I suggest you let Paul take a look at it so
he
>can build a similar module -- advertise it as "sounds from Vulcan,"
everyone
>will think it means Star Trek.

and funnily enough, when i fired the thing up this morning it sounded
totally different to what it did last night - for a while it was a-l-m-o-s-t
the Doctor Who Theme.

>Where did you get a pulse generator from a Vulcan bomber -- you didn't buy
>form a guy named Blofeld at some tech swap meet did you?

nope, it was an old guy (very old) and his cat who ran a small warehouse
down in the Don Valley (industrial wasteland cum shopping mall part of
Sheffield) - he must have been a radio ham who turned to the dark side (he
even had a radar tower on his roof), and started buying and selling stuff
from government auction. i don't think he ever sold a great deal - only
stuff to other radio hams. he retired about two or three years ago - and I
always wander what happened to his stock...
cheers
paul