Keying Mic changes TV channel

#398309

Just what the subject says. I'm running a stock 980SSB with Terminator II antennas in a KW T680. Every time I key the Mic, my DirecTv changes channels. When its keyed for more than a couple seconds, the channels spin like they're on Wheel of Fortune. Everyone I've talked to over the radio says it sounds good and is crystal clear. Only issue is the channel changing of the tv. I've checked all pwr and coax connections, all are tight and corrosion-free.
What's my issue and how do I fix it? TIA

#398318

Well this is a new problem I've never ran across, I'm guessing the TV is fine, it is the Directv receiver that is the problem. To really get into this I'd need to know the receiver model and the satellite antenna brand and model, these are where the problem lies. My best guess is CMC, (Common Mode Current). First suggestion is to relocate the coaxes if are they are near each other. Grounding (bonding) always helps, add a ground wire from the case of the CB to a good metal surface close, short wires are important, I'd ground the satellite antenna's mount as well. I'll probably have more questions as we go along.

3's

Greg

#398325

Howdy Greg,
The receiver is a HR24/200. The Sat dome is an EpicVue. I'm a company driver, all the equipment came with the truck with exception of cb and antennas. Reckon I'll start with bonding the cb to the truck chassis as that's the easiest. They sorta frown upon work being done on the truck by non-company mechanics! Lol Thanks for the direction!!

#398331

If you suspect Common Mode Currents. Take your coax make 6 loops maybe 4inch diameter wrap some electrical tape to hold the form. You have just made a common mode current choke. See if that helps.

If not unhook the coax from the DTV box and see if keying the mic still wrecks havoc.
Also is your antenna inside or outside? Transmitting inside could wreck havoc on some RF recievers.
I've been told to keep my sdrs away from trasmitters.

nosaj

#398332

Nosaj, all antennas are mounted outside. Terminator II's on the mirror arms and EpicVue on the back top left of the sleeper.

#398335

TxCav wrote: ↑August 7th, 2019, 4:05 pm Howdy Greg,
The receiver is a HR24/200. The Sat dome is an EpicVue. I'm a company driver, all the equipment came with the truck with exception of cb and antennas. Reckon I'll start with bonding the cb to the truck chassis as that's the easiest. They sorta frown upon work being done on the truck by non-company mechanics! Lol Thanks for the direction!!

Try some bonding first, make it look professional and the company would never know. The Directv receiver is one I had for years and never interfered with it so it might be the EpicVue antenna, you could try several (six is enough for CB frequency) ferrite snap beads on the coax.

3's

Greg

#398339

How is the power run to the CB and the radio receiver?

#398373

Since we have never ran across this problem let us know how thinks went, all my suggestions would be experimental. Would like to keep this as a reference for future members.

3's

Greg

#398397

Just a quick update. There's not enough coax to facilitate choke loops, I was able to put one loop in each length of coax...no change. I haven't been able to get ferrite beads yet, as I've been on the road but will try to locate some today. Thanks for all the suggestions.

#398650

FIXED! The issue was grounding. The DirecTv is not grounded through the power cord. To fix, I grounded the DVR "case" to the truck chassis.

#398654

Great,, glad we could help. I would say 90% of all issues stems to grounding (bonding).

3's

Greg

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