Weird noises!

Tobor · Post by **Tobor** » Thu Nov 18, 2004 4:41 pm

I've discovered a funny High frequency interference..in the radio band, around 125.630 Mhz
If your voyager is turned on and you tweak pots you can hear a modulated interference.

You never end to discover the craziness and beauty of this machine.

Post Scriptum:
Frequency may (?) vary depending by AC Voltage used.

How to Noise · Post by **How to Noise** » Fri Nov 19, 2004 10:53 am

Noted!

Can you be a little more specific about how you found these sounds?
Also, I know the US and Europe utilize different power supply voltages...do you think this would have any effect on this? I'm a struggling noobie to analog electronics.

Tobor · Post by **Tobor** » Tue Nov 23, 2004 4:32 pm

I have a radio scanner.. it's a receiver wich I use often to record sound effects.
Basically I can listen any frequency between 150Khz up to 3Ghz (Giga ; )
Yes here in Europe AC V is around 220/230 Volts..I guess USA is 110V
Also here Frequency of AC is 50Hz while in the US is 60Hz
(and this is why here Video frames standard is 25fps and not 30 like in the US)

I guess interferences may be caused somehow by the bus wich controls the pots.
Well.. the Carrier wave could be many different things..oscillators, amplifiers..but I'm shure the Carrier is modulated by a source electronically related to the pots.

MC · Post by MC » Tue Nov 23, 2004 4:47 pm

Isn't that just heterodyning?

Tobor · Post by **Tobor** » Thu Nov 25, 2004 5:05 pm

no..
heterodyning is a different thing.
Since old analog stuff used tubes and a very poor EM shield, hand of player and tubes acts as a big capacitor.. making the Voltage changing.

Boeing 737-400 · Post by **Boeing 737-400** » Fri Nov 26, 2004 4:28 am

Do you mean hearing interference on radio receivers? Depending on position of my Voyager, I hear interference on the radio when the machine is on, and even more when a knob is turned.

Tobor · Post by **Tobor** » Mon Nov 29, 2004 9:54 am

yes. Correct.