Icom 706 + turbo tuner issue.
Hello all.. I am a fairly new ham, so go easy on me
I just got my general license. And i got my mobile setup. I have an Icom 706 and a Tarheel 400a with a turbo tuner. Everything works fine. Until i ground the chassis of the radio. Once i ground the chassis of the radio and then key up the radio switches to CW mode and the tune / call light flashes and the radio beeps at me.. Now, if i leave the radio grounded, but let the tuner tune the antenna to the right setting, then unplug the tuner from the radio, when i key up there is no issue.. Has anyone ever seen or even heard of this kind of problem? Ive talked to a few people who havent heard of this kind of problem before, and a couple more who thought it may be some sort of RF problem...
Any help or info would be great!!
Ya, it's an RF issue. Welcome to HF BTW. It is a LOT of fun but can be very trying LOL.
How is the negative lead of your radio attached to the vehicle?
Are you using a remote head separation kit?
Generally, for these type problems, we add ferrite beads over various control cables which will keep the RF out.
"Life is just like ridin' broncs, its a battle". Chris ledoux
Long live Steamboat
I believe what we have here is a ground loop. Without knowing a lot more about the installation, any of us are guessing.
I suggest you visit my web site, and look at the Ground Loop article, the Antenna Controller article, and the Wiring article.
That may be part of the problem. You grounded the radio chassis to the negative lead of the battery - and not the frame of the vehicle. The battery is not a good place to ground your radio.
Whether you ground directly to the battery post, or the chassis next to the battery isn't what's causing the problem. It is the installation as a whole. As I said, unless we know more than we do, it is guess work!
Well, the install is like this. Radio mounted under the dash, No separation kit. Radio wired straight to the battery with heavy gauge wire, Turbo tuner mounted under the seat, cables ran straight to the radio on one side, coax ran to the tuner and antenna on the other side. Tarheel antenna mounted to the bed of the truck, right behind the cab, 1 inch ground strap ran from the mount of the antenna to the frame.. and thats pretty much it for the installation.
Is the bed bonded to the frame?
Is the bed bonded to the cab?
Trust me on this-it is indeed a ground loop!
Yep, its all bonded well.. cab to frame cab to bed, doors to cab, hood to cab, fenders to cab, bed to cab, bumpers to frame, And all are bonded to frame of the truck..
Now to eliminate the ground loop...