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I tried this on the boaters forum with no response

Old 04-14-2003, 06:00 PM
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Default I tried this on the boaters forum with no response

A little background. I have the Yamaha analog type tach. I installed a CD/FM player this past Christmas. I also installed a splitter for my FM – VHF. Here is the problem: every time I key my mike on the VHF with the engine running, my tach needle jumps to 9000 + rpm . Will this hurt the tach and would anyone know what might be causing it to happen?

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Old 04-14-2003, 07:14 PM
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Default I tried this on the boaters forum with no response

I don't know a whole lot about receivers and antenna's, but I was talking to a technician today in a radio store. I told him I wanted to install a splitter on my VHF antenna and run a wire to my AM/FM radio. He told me the first time I keyed my mike with the radio on I would fry my VFH receiver. I don't know if you have run both units together but maybe thats what's causing the interference with your tach.
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Old 04-15-2003, 04:51 AM
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Default I tried this on the boaters forum with no response

I'll just ask a couple of question. Where did you wire the VHF to? Where did you wire the CD/FM to? Was it to the power on the tach? Did you try to use the VHF alone without the splitter and the current setup?

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Old 04-15-2003, 05:37 AM
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Default I tried this on the boaters forum with no response

Mumblerone,

The VHF and CD/FM reciver are seperatly connected to the fuse block that came with the boat. There were 6 spare fuses so each was connected to it's own power source. I have had the boat for almost a year now and I don't recall if this was happining before I installed the FM/CD. I will try it without the splitter the next time I am on the water. If it stays like it is, do you think it will harm the tach?

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Old 04-15-2003, 08:44 AM
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Default I tried this on the boaters forum with no response

The problem has nothing to do with the splitter. You are talking about a VHF/FM splitter like the one shakesspear makes right? Not just a cable TV type splitter?

RamNW,
There is a splitter made for this purpose especialy. It works fine and will not fry anything. What the technician in the store yo uwere talking toi was referring to was just splitting the cable with a regular Y type splitter. Yes, that will fry your radio. But the below unit, works fine.

Anywho, Skeeter,
Your problem is caused by rf noise. Whta you need to do is find where the noise is coming from. Could be a bad vhf cable, could be your VHF radio, could be a bad conection of any of the above, and lastly, it could be a bad ground. And that's where I would start first. Is your VHF connected to a GOOD ground? Make sure it is, remove it, clean the connection, re-install. Check each connector for the VHF antenna, from the radio, to the splitter, and at the antenna. Then, chck to make sure your antenna cable is not nicked exposing the shielding, broken, kinked...

Also, try to route your VHF antenna wire as far away from your Tach and engine power wires as possible.

Good luck.

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