Topic: 999hdsi and lowrance hdi5

[bassmasterG13]

hello everyone I have a 999hd si mounted on the transom of my bass tracker. I recently added a lowrance hdi5 to my trolling motor for the bow. Every once in a while my hummingbird goes out of wack and reeds 400+ feet with stuff all over the screen. I don't know if I am cross talking sonar on the units or what. Did this happen to anyone and is there a way to set up both units so they don't cross talk, if that is infact what you think is happening?
Thanks Gio

[Humminbird_Greg]

Gio,
I am assuming that the other unit is using 200kHz as well?  You should be able to check this yourself.  If so, you are probably getting some sonar cross-talk (interference).  Try turning on and up the Noise Filter menu on your 999 unit and see if that helps.

[bassmasterG13]

I can set the other unit to anything but yes I think it is on 200khz. Should I change that frequency or just try to turn up the noise filter ?

[Humminbird_Greg]

I would change the frequency if you can.  Otherwise the Noise Filter may be filtering out some of the weaker sonar signals that you want to see on your 999 unit.

[bassmasterG13]

what do you recommend turning the frequency on the lowrance to ? Am I only getting cross talk because its not 2 humminbirds?

[Humminbird_Greg]

I have no idea what frequencies the Lowrance unit is capable of.
You are not getting cross-talk because of the brand(s) of sonar units you are using.  You are getting cross-talk because you have more than one sonar unit transmitting and receiving sonar at the same frequency as another sonar unit and the sonar beams are overlapping.

[bassmasterG13]

ok i have my hbird setup on beam select 200/83 kHz and my frequency on 455 kHz which is recommended for best readings correct? i will just setup the lowrance on something different and hopefully not get the cross talk

[Humminbird_Greg]

Depending on how you are using your 2D sonar I might set it to only use the 200kHz frequency.