1 May
2012
1 May
'12
5:58 a.m.
On 05/01/2012 07:52 AM, David Riley wrote:
Differential inputs are all well and
good, but I've found that even with my setup, some GSM cell
phones can introduce noise in the internals which gets
propagated quite audibly (that biiiiiiiiiiip bip bip bip sound
comes from the RF power amp switching on and off at the TDMA
frequency and couples into audio amps quite well, I've found).
Have you looked at the current waveform of a GSM modem while it's
transmitting? Oh MAN...it's a wonder that problem isn't worse than it is!
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA