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Reply With QuoteI believe US2 is 2d sonar only? and mot down view, unless you are mixing up the terminology.
You could put each unit on a separate frequency I would think
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Finally planning to use US2
Background
I've owned Terrovas for many years--all with US2. I also use a HB-1197 so the US2 has been useless because it has no side scan capability. Instead, I mounted a side scan transducer under the motor and snaked the cable through the slot in the Terrova's shaft. Unfortunately, this arrangement causes so much static that a good deal of the side scan detail is lost in the "snow". I'm correcting that problem by making two changes.
First, I moved the side scan transducer (and the GPS receiver) to a stern mount--greatly improving the side scan image, but sacrificing the down view up front. Most of the time, I'm floating 8 corks up front and I really miss the down images that show what's under my feet and the baits.
Second, in order to correct the down view problem, I plan to add a second finder and connect it to the US2. I'm aware of the potential for cross talk between the two finders, but most of the time I'm in fairly shallow water & so the geometry should work in my favor.
Questions
1. Is anyone using a 2-finder setup that makes use of the US2? What finders are you using and how do they work together?
2. Who' run into the crosstalk problem and how did you solve it?
3. Are there any US2-compatible finders that perform poorly and should be avoided?
Trophy King II
I believe US2 is 2d sonar only? and mot down view, unless you are mixing up the terminology.
You could put each unit on a separate frequency I would think
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On Lowrance 2d is 83/2000 kHz and down imaging is 455/800 kHz. I believe Hummingbird is similar and if that's the case you won't have interference problems. The bow unit on my Lowrance has 2d and downscan in one transducer.
I do have a neighbor that runs both 2d and downscan units on the bow.
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I run Lowrance on US2 with 2d and humminbird 998 on rear and have had no problems with cross talk.
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Trophy King II
As I thought the Minn Kota Universal Sonar transducer is a 200 KHz conventional sonar transducer. Down image will NOT work with it
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Very likely. It's been a long time since I studied finders and compared features.Originally Posted by MonteSS
With the 1197 mounted on the back (display unit up front), all I want up front is a simple plain vanilla unit. Originally, the plan was to cull through the lifetime junkpile of old finders & reuse one. For various reasons, none of them are suitable. Before buying one of the 8 expensive US2 adapter cables, I have to decide on the finder.
Sidescan doesn't fire in the direction of the US2, so that's not going to cause interference. Downscan and 2D are the potential problems. The US2 transducer is only capable of 200/83 kHz & they're also the frequencies used by the 1197.
Edit: Looking at the Terrova manual again, I see the 2D-only limitation.
Last edited by Corker; 10-31-2015 at 09:03 PM. Reason: Additional point
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The 200kHz 2d transmit cannot be shut off in any of the CORE series HB units (except by turning off ALL sonar on a specific unit) ...
So it doesn't matter if the 1197 is "viewing" SI/DI ... It's still transmitting 200kHz 2d for digital depth (as has been noted already) ...
There will be crosstalk interference with both HB units sonar on ...regardless if using the stock xducer or the US2 xducer ...
How bad the crosstalk is can only be determined by trying them ...
Rickie
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Trophy King II
Run a 2d head unit of your choice and the US2 TD at 200hz
Run the 1198 tTD at stern on 83hz (even if it is not being used)
Should be no cross talk
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Running a HB CORE unit on 83kHz still does not shut off the 200kHz transmit signal ... It merely only allows the 83kHz 2d view to be seen ...
HB Core units must transmit the 200kHz signal for digital depth ...even if it's in the background where it cannot be seen ...(or chosen to be seen on the display) ...
Lowrance has this option (of selecting 83kHz without transmitting the 200kHz)...
HB core units do not ...
Rickie
Last edited by rnvinc; 10-31-2015 at 09:26 PM.
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Very good to know. This puts Lowrance on my list. Originally, HB looked like an obvious choice to minimize the learning curve, but if there's an important performance difference, that changes everything. It would be useful to hear additional experiences with crosstalk. It only happened to me once and the only noticeable problem was that one of the units reported twice the actual depth. When this occurred, the boat was in 65 FOW and the two transducers were about 12' apart. In shallower water, the cones must not overlap.
