@ Greg, running Elite 7 and 998c side by side

Greg, and again, other experts,
How much interference would you expect to create if you mounted an Low Elite 7 HDI transducer, very near a 998c HD transducer.
My idea here is to (perhaps) bite the bullet and get the
Elite 7 beside the 998c in an effort to get a quality down image from the helm.
I'm very concerned that both units running the 455 or 800 mhz would ruin each other.
I'd want to leave the Elite 7 in down scan mode all the time.
As a bit of info, I have done this with the998c and the Low HDS7 touch lss 2 and the interference is strong with both units running the SI at the same time.
I've had to stop the sonar on one, to see the other well.
Also, comment on using the Elite 5 with the 998c
thanks,

Did you try setting one unit on one frequency and the other unit on a different frequency? Since these are separate units, RX/TX are not in sync. The crystals have a narrow passband and should only respond to the transmitted frequency selected.

Tom is correct in that running different frequencies is the most common way of avoiding crosstalk interference..(in an operational every day venue)...

The disadvantage (in a testing venue)...is that testing "A" unit against "B" at different frequencies is not comparing apple to apples..

It would be very convenient in testing 2 units against each other in a "side by side" testing venue...but unfortunately sound wave theory and how frequencies interact (or don't interact) under water wil not allow it...

For example ...setting unit "A" to 455kHz and unit "B" to 800kHz and running them side by side does not give an apples to apples comparison to definitively say..."Well unit "A" looks better right there side by side against the other ..so it must be better..."

Sensitivity, contrast, color palette, and such settings are understandably going to be needed to optimize each unit's data being plotted...

Frequency, boat track, same day water conditions, and such settings must be equal in order to get definitive results of how each unit responds ...

And the only way to get such criteria equal (without crosstalk interference) is to run the same boat test path over and over separately ... with each separate unit set at the exact same frequency for each test...

This is accomplished by shutting 1 unit off and test the other at 455kHz in "Unit A - 455kHz -boat path pass 1"..
Then shut that test unit off and test the other at 455kHz in "Unit B - 455kHz - boat path pass 2"..
Etc.etc.etc

Test results are always interesting....but said results must be garnered without variables in the separate test units...or the test results are not really valid...

Now if the goal here is to merely find a way to operate the 2 units side by side in an everyday venue...then everything I said above is moot ...

And just follow Tom's note of run them each at a different frequency..

Rickie

You must follow a certain pattern when comparing units. Remember, 2 apples of different sizes falling from a tree will reach the ground at the same time if they start at the same time and same height if there are no obstructions. Seems you have obstructions.

back to my original inquiry concerning elite 5 x along side 998 and operating concurrently,
The 998 on SI with the elite on down image would likely be a mess. correct?

perhaps mounting transducers as far apart as possible would solve this issue? I can separate them by 4 or 5 feet

Mount them temporary and try each at different frequency and see..

May be a mess...may be fine...

Rickie

Dear Humminbird,
Please take notice of the fact that many are going to spend the equivalent of another fish finder to achieve what you claim is on your best units.
Make it better, they will buy.