Transponder wiring question

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M

mrbill

I'm installing a depthfinder, and was wondering if anyone has tried quick disconnect wiring? do all transponder cables use a coax type wiring? this is cheap humming bird (lcd),... could it be digital? thanx!
 
D

Don Flowers

Not sure, but here's my best shot.

I'm not sure if your unit uses a standard coax or is a double pair. Either way manufacturers don't like you cutting the wire due to the fact that resistance is very important in the signal being returned. I have cut them and soldered the wire and worked okay, but a disconect would definately change the resistance and thus the signal return. I know we have several elec. enginers out there and hope I am somewhere in the ballpark with my answer. Would also love to hear from an elec eng. Don Flowers Rockport, Texas
 
Dec 2, 2003
4,245
- - Seabeck WA
I had to cut my Interphase Probe to reeve the wire

I called the factory and they said "go ahead, no problem". The cable has a signal wire for each of nine arrays (transducers). Each is wrapped in shielding foil. I installed a junction block in my NavPod, stripped the wire and shielding, crimped on ring eye terminals and turned it on. Works great.
 
C

Chuck Wayne

cutting transponder wire

I asked raymarine this question and they said it's ok to cut the cable as long as the connection was really good-ie soldered. Isuppose marine grade quick connects or a terminal strip would work if it's really tight
 
Dec 2, 2003
4,245
- - Seabeck WA
I think transponders are for sending electrical

signals, like satellite TV. Transducers are for sound. (sonar) Right, engineers?
 
Dec 6, 2003
295
Macgregor 26D Pollock Pines, Ca.
You're right Fred...

while the two get used interchanably sometimes, they are in fact two different things. Mr. Bill, why are you installing a quick disconnect, to make running the cable easier or so you can remove the unit easily? The type of connectors one would choose are different depending on the application. The manufacturer should be contacted before cutting the cable for a couple of reasons, do they already have a kit to do what you want and will cutting the cable void the warranty? You will also get some signal degradation no matter what type of connectors you use, could be from minor (not noticeable) to major, depending on the type of connectors, installation quality, etc. Jeff
 
D

Derek Rowell

Transducers/transponders

In technical terms a transducer is a device that changes one form of energy to another, so that loudspeakers, microphones, piezo-electric ultrasonic elements, motors, generators are all transducers. Depthsounders therefore use "transducers" to generate the acoustic pulse and to detect the echo from the seabed. A transponder is a device that receives a signal (usually radio frequency) and transmits another signal in reply. For example, a radar transponder detects an incoming radar "ping" and transmits a strong signal back. Aircraft use transponders.
 
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