Echo settings or installation?

[Yan]

Hi,
Fresh new installation and I'm having a lot of noise. With auto gain look as in the picture and with manual gain I still have some vertical lines. I'm wondering if it's about settings or bad installation?
Tzt3 16f with dff3d, multi beam sinar

 

[Sparky Wire]

What transducer are you running on the fish finder? It does appear that you have some cross talk happening. What setting do you have the interference rejection set to? Do you have photos of where the transducers are mounted on the boat in relation to each other?

 

[Yan]

I have only the multi beam. Furuno 165T/265LH-PM488 Combo XDR for DFF3D 165T/265LH-PM488-12P . The rejection I used a preset. Now I used settings mentioned in another post. Still I get this tiny vertical lines

 

[Sparky Wire]

Have you tried transmitting only the DFF3D with the other part of the combo in stby and vice versa? Are the lines then gone?

 

[Yan]

Have you tried transmitting only the DFF3D with the other part of the combo in stby and vice versa? Are the lines then gone?

If I stby the other part the vertical lines disappear. Due what? Can be fixed?

 

[Sparky Wire]

Sounds like cross talk when running both sounders. Most will increase the Interference Rejection to a higher amount and clear most of it and live with the rest. The alternatives would be to transmit each only by themselves, or add a key pulse cable between the two units (p/n 001-605-510-00). Adding a KP kit will stop any cross talk but will slow the sounders slightly as they coordinate with each other in the firing of the signals.

 

[Johnny Electron]

Being the DFF3D uses 165Khz and the B260 elements uses 50 and 200, I wonder if it isn't cross talk but the wiring getting EMI bleeding over between the two transducer cables, when both are in use. You might see if the cables were mounted along side each other for a long distance and if they are try to separate them. Being it clears up when only running one of them, I think you guys are on the right track.

 

[Yan]

Being the DFF3D uses 165Khz and the B260 elements uses 50 and 200, I wonder if it isn't cross talk but the wiring getting EMI bleeding over between the two transducer cables, when both are in use. You might see if the cables were mounted along side each other for a long distance and if they are try to separate them. Being it clears up when only running one of them, I think you guys are on the right track.

The distance from the transducer and the dff3d is about 2m. Is this a long distance?

 

[Yan]

Sounds like cross talk when running both sounders. Most will increase the Interference Rejection to a higher amount and clear most of it and live with the rest. The alternatives would be to transmit each only by themselves, or add a key pulse cable between the two units (p/n 001-605-510-00). Adding a KP kit will stop any cross talk but will slow the sounders slightly as they coordinate with each other in the firing of the signals.

I'll try to increase the rejection

 

[Yan]

I've increased the rejection and it fixed. Thanks

 

[Deep Blue]

Yan,

it's "Interference Rejection" for the win..!