Start Up Sounds

[Anonymous]

I was wondering if anyone could explain what the start up sounds in a SD relate to.That is the first,the gap to next and the final.
Regards Frank Wallis

 

[Anonymous]

I always thought they were the two channels starting up at different times. If you start up an SD with it on one channel, you only get one startup noise. Cheers, Chris Hake.

 

[Anonymous]

IMO,
It's due to the natural time it takes the dual sequence pulse/timing VCO(2100) or Xtal Ocillators(2000) to fire/settle and then provide managable sampling data to the 3 RX sampling ref inputs in the RX and G-balance cct, then naturaly settle in combination with functional RX data from the coil input.
(anyone who's pushed the envelope with coil design would hear the differance in the the SD series startup call when it's trying to sample and settle under "un-natural" conditions. heh.)
In the 2000/2100 series the startup sequence can also alternate from fast to slow depending on the oscillator firing time due to "alternative" coil parameters, but in the 2200 it's usually stable and shorter due to it's ability to process high powered RX saturation.
Incidently, the manufactured sound process of the 2200 incorporates an AGC to kill the excess audio anyway so startup is largely disguised, similar to how it hides the screaming that goes on in the background during the "Metal Discriminator" phase.
-gaz