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170 kHz depth sensor on a NSS8

Old 09-08-2014, 12:31 PM
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Default 170 kHz depth sensor on a NSS8

Hello everyone,

First post on THT, but been lurking your marine electronic forum section for a year, mainly to comfort myself on my selection of autopilot (Simrad AC12N) and battery charger (ProNauticP).

It is my third season with a new to me sailboat, C&C38 mk3, built in 1988, with all the original electronics (and still working great). My depth instrument is a B&G Hecta with a 170 kHz through hull sensor, and I also have a B&G Hornet 4 for boat speed and wind speed/direction, with cockpit repeaters. I replaced the original VHF the first year with a Standard Horizon SH2150 with it's dedicated Garmin 17x GPS. I also trashed the Loran C the first year.

I started to upgrade my electronic last year by adding a B&G Zeus Touch 8 (Simrad NSS8 hardware with different branding and software). I did some test connecting the 170kHz depth sensor to my Zeus Touch echosounder input, selecting a Generic 200 kHz as sensor type, with good results at the dock (depth of 7 feet) and in less that 100 feet. With its original instrument (B&G Hecta), it can reach down to 660 feet (I lose bottom in the middle of Ontario Lake). What reach reduction I should expect with the NSS8 sensor selection (200kHz) as it is not using the sensor at its optimal frequency?

Also, Airmar has some 235kHz sensor, and they say that it prevent mutual interference with other echosounders on a vessel. This mean that the reception of the instruments are frequency selective. Just an idea that I have, but if I plug the B&G Hecta (operating at 170kHz) and the NSS8 (operating at 200kHz) to the same sensor, will they interfere each others? Do I risk overloading the sensor or the reception electronic of one instrument with the ping of the other?

From what I've read here, I think abbor will have an answer.
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Old 09-24-2014, 03:51 AM
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Up from page 6 with 69 views.

I sent the "Zeus Touch and Hecta on the same depth sensor" question to Navico. I will report their answer.

As for the reach reduction part, I will do more test next summer. Haulout next weekend.
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Old 09-24-2014, 09:31 AM
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it will not work effectively, a transducer relies on the harmonic vibrations at a certain frequency to send a pulse to the bottom and back. it counts how long it takes for the pulse to get to the bottom and back and displays it as a numerical value. the NSS8 will be trying to vibrate a 170 Khz element at 200kHZ, grossly affecting the range and timing of the signal.
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Old 09-24-2014, 05:29 PM
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Here is the answer from Navico on the 2 sounder on one sensor.

"I don't think it would hurt the transducer but it sure could hurt the two sounders and if nothing else they would sure interfere with each other."
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