|
New to Ham Radio?
My Profile
Community
Articles
Forums
News
Reviews
Friends Remembered
Speak Out
Strays
Survey Question
Operating
Contesting
DX Cluster Spots
Propagation
Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers
Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net
|
|
1-10 of 27 messages
|
Page 1 of 3
Next
|
|
Pioneer Plasma TV
|
Reply
|
|
by WA8EBM on November 25, 2006
|
Mail this to a friend!
|
Just bought a top of the line Pioneer Elite 42in Plasma TV. The most beautiful picture you can get.
If you are concerned with RFI on the ham bands
RUN from this baby! Doesn't really bother me cause it is just me and the wife now and most operating is done during the day when she is at work. RF hash all over the spectrum.
|
| |
|
RE: Pioneer Plasma TV
|
Reply
|
|
by K8AC on November 28, 2006
|
Mail this to a friend!
|
|
Have heard that before about Plasma TVs, but thought it was a common problem for the technology, not just that brand. Anyone know for sure?
|
| |
|
Pioneer Plasma TV
|
Reply
|
|
by K9EID on November 28, 2006
|
Mail this to a friend!
|
Sarah and I have two 50" Pioneer Elite Plasma sets.
One of them is not more than 30' from the ham station.
I have never had any hash or interference
that I know of. Not certain what the situation is
but the Pioneer Elite is clean.
K9EID
Bob Heil
|
| |
|
RE: Pioneer Plasma TV
|
Reply
|
|
by WA8EBM on November 29, 2006
|
Mail this to a friend!
|
I think you meant to say YOUR Pioneer Elites are clean. I have S3 to S9 raspy carriers worst on 20 meters and 75. My shack is in the basement under the family room where the tv is at about 20 to 25 feet away from the radios. Perhaps you have an interest in Pioneer and can send an engineer my way. I would not have posted this had the interference not been severe.
Mike WA8EBM
|
| |
|
RE: Pioneer Plasma TV
|
Reply
|
|
by AD5X on December 2, 2006
|
Mail this to a friend!
|
I have a 3-year old Pioneer PDP-5040HD plasma. Fabulous picture. I was concerned about RF hash based on reports of this with plasma TVs. But I've never experienced a problem with RF hash. The TV is about 15 feet from my ham station, 50 feet from my ground mounted Butternut vertical, and about 20 feet directly below my chimney-mounted MFJ-1775 40-2 meter rotatable dipole.
Phil - AD5X
|
| |
|
RE: Pioneer Plasma TV
|
Reply
|
|
by KI8DJ on December 16, 2006
|
Mail this to a friend!
|
|
I have a dell plasma tv. The interference to my hf rig is about the same as my crt sets, maybe a bit less. I think the whole plasma panic is a bit overblown.
|
| |
|
RE: Pioneer Plasma TV
|
Reply
|
|
by WA1RNE on December 20, 2006
|
Mail this to a friend!
|
Believe me, plasma TV emissions are a problem and seems to vary considerably depending upon the brand and model.
I'm going through an issue right now with a neighbor; the TV is about 150' from my 75 meter vertical and I have S9 +15dB of hash/buzz on 3.880 Khz and about 6 other frequencies across the band. I'm able to track it to their house using a portable shortwave receiver and an AM broadcast receiver.
I can see the TV screen when it's on at night. When it goes off later in the night, so doesn't the RFI - completely and consistently every night.
In my case, the big question is whether the RFI is caused by conducted or radiated emissions or both. It's more likely to be conducted noise coming from an internal switching supply that is either coupling to the AC mains and/or common mode noise coupling to their satellite dish coax and radiating.
This is an interesting possibility as the dish is on the roof of their garage and the coax is about 60-65' long - yes indeed, a nice 1/4 wave radiator for 75 meters!
I'm in the process of taking some field strength measurements and determining the FCC ID from the TV to see if it shows up in the FCC database as a "verified" device. Being a Part 15 Class B consumer device, it must have an FCC ID to be sold in the U.S.
Depending on how this goes, I may write something up on eHam and share any fixes for the problem, if it works out that way.....hopefully it will.
WA1RNE
|
| |
|
RE: Pioneer Plasma TV
|
Reply
|
|
by WA8EBM on December 20, 2006
|
Mail this to a friend!
|
The RFI from my Pioneer elite is definitely radiated. If there is no picture or raster/menu or whatever on the screen there is no interference. I can rotate my beam and raise and lower the interference level. If I hold a portable AM radio 5 feet from the screen it completely blocks out the signals. I think the people that do not have problems have antennas up on high towers away from the house or do not use open wire feeders or most likely are very likely they have a quiet plasma set. I think my only solution is to enclose the whole tv room in copper screen!! There is even interference to my mobile with screwdriver antenna in front of the house. Piles of chokes/toroids on all the leads have absolutely no effect. It is from the color burst raster.
I can work around it and almost think it is worth it cause of the fabulous picture from the Pioneer.
|
| |
|
RE: Pioneer Plasma TV
|
Reply
|
|
by WA1RNE on December 22, 2006
|
Mail this to a friend!
|
Unfortunately, it's a little more complicated than just the color burst signal radiating. Remember, the color burst signal is on the backporch of of every color CRT set, but most don't have the RFI problems like some of these plasma's - and are certainly not radiating S9+15 db of EMI at 150'.
The majority of Plasma's use a 400 volt pk-pk, 100Khz AC voltage source with a rectangular waveform to ignite the helium-xenon gas mixture, sustain the IR emission, then allow it to discharge when the voltage changes polarity. That's basically how Plasma pixels are fired.
The problem appears to be in the duration of the sustaining current waveform and duty cycle which appears to end up as EMI in most of the lower HF ham bands.
It does appear to be coming mostly from the screen area, probably from the large matrix used to address and fire all the display pixels.
WA1RNE
|
| |
|
Email Subscription
You are not subscribed to this topic.
Subscribe!
My Subscriptions
Subscriptions Help
Check our help page for help using
Forum, or send questions, comments, or suggestions to the
Forum Manager.
|
|
|
