Plasma TV QRM on HF radio

Panasonic Plasma TV QRM being received on my Yaesu 950.

The antenna for my shack is in the loft and runs directly over the living room and the TV. The TV itself is approximately 30ft from my radio.

Category:

Science & Technology

Tags:

• ham radio
• ham shack
• icom
• yaesu ft 950
• sstv
• 2m0jas
• mm3fgd
• handie talkie
• kenwood
• plasma tv
• QRM
• k7age

[2M0JAS]

Well I've not been able to resolve the issue, so I've now replaced the TV altogether...with a nice LG LCD.

Its really like have a whole new radio without the interference!!!!!

[jssawyer1993]

Hang on a second... did I hear that right... you have a full size G5RV in your loft? all I have to say is wow! i can hardly fit a half size G5RV in my garden!!!

Nice Video

73's

Jonathan

M3VJO

[2M0JAS]

Hi Jonathon,

No its only a half size one, would never be able to get a full sizer up there lol!

[jremba]

You maybe tried this before, but if not, you should check your grounding system, I have seen a lot of cases like this being solved by installing a proper grounding system to your radio and also your TV, the shielding should be grounded. Also the noise maybe transfered not by the air and into your antenna, but by the same electrical system, so the use of filters can make the difference, but I am almost sure that grounding is the answer. Good luck

[2M0JAS]

HI,

Grounding certainly is a big problem for me as I stay in a top floor flat so its difficult. I got myself an MFJ artifical ground to try but early days testing that.

I've tried running on Battery power with the 706 I've got here too,with very little difference but a mains filter is definately a move I'll be making.

Thanks for the advice, every little bit helps!.

[markbeermonster]

HI there James

You might have already tried it but have you try ferrite clamps on the scart leads as that cured my QRM from a tv in my shack

M6RKY

73

Mark

[2M0JAS]

Hi Mark,

Yeah got the big clamp on ones here I've popped 1 on each end nearest the scokeets but no difference, however I do know its part of the problem as I pull the scart out and the level dips a little.

Cheers

James

[bradmann85]

i have that same problem on a portable shortwave radio. something in my house is bothering the radio. specialy near a plug. but i go outside to listen to shortwave and ham bands without that annoying noise. i keep blaming the high voltage powerlines outside. but i go outside and a bit closer to the powerlines they dont bother the radio. when i actually listen to the annoying sound it attends to have change in tone as if it were video signals for a tv. 

[ilovenbcnews]

The noise reminds me of the old computers that did not have good RF shielding.

[GMSamuelRhine]

no wonder why i have such a hard time dxing.

[mesmerizeme]

perfect solution to annoy my neighbour with one of these huge aerials thanks i will buy 2

[petchharrison]

so what will ofcom do answer not a thing...jeff..ps ofcom stands for totaly naff quango...............73,s

[m3ypu]

I feel for you I have the Same problem from my naughbours tv it wipes out all of the bands at about 200 eg( 7.200,,,,14.200). I changed my antenna from a vertical to a wire, and there is a good improvement not wonderful but better,I have contacted ofcom many times ....... There not intrested

M3ypu

[5p1cc]

You will just need an Timewave anc-4 or similar phasing device to remove the hum from your receiver.

I have an homebuild phaser, that works wonders on 40 meters..

[OchrismongrelO]

The problem is that plasma tv SCREENS put out RF. Unfortunately, there's no way to filter that out that I know of, though some of the people on QRZ or EHAM may have some ideas.

[jremba]

YES a 4 foot rod and a 6 foot cooper wire will do.