Humminbird Side Imaging Forums

General => General Discussion => Topic started by: habit_mapping on February 07, 2012, 12:30:06 PM

Title: 1197 downbeam kHz and screen waterfall rate
Post by: habit_mapping on February 07, 2012, 12:30:06 PM

Folks,

Can some explain the exact mechanisms that causes the screen "waterfall" (or clear rate) to slow by approx. half when the downbeam kHz is switched from 200 kHz to 83 kHz on an 1197c unit?

Much obliged.   

Title: Re: 1197 downbeam kHz and screen waterfall rate
Post by: sonar2000 on February 07, 2012, 12:53:53 PM

HM, I am not sure what you mean by waterfall or clear rate. Can you describe this a little more...
I may be the 1% that is not up to date on terminology. ;D...... :P
Thanks..
Chuck

Title: Re: 1197 downbeam kHz and screen waterfall rate
Post by: Humminbird_Greg on February 07, 2012, 01:07:49 PM

If you are meaning the rate by which the display gets updated, than this is due to the unit having to transmit and receive on two frequencies at the same time.  Even though you may set the unit to display only the 83kHz sonar frequency; it is still transmitting and receiving at the 200kHz frequency in order to determine the water depth.

Title: Re: 1197 downbeam kHz and screen waterfall rate
Post by: habit_mapping on February 07, 2012, 01:42:06 PM

Thanks. That answers my question.

Cheers.