| Author |
Message |
    
Limacharly6
New member
Username: Limacharly6
Post Number: 8
Registered: 1-2004
| | Posted on Saturday, November 05, 2005 - 6:13 am: | 
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Now im to understand alot of people are having tvi problems...hmm. now it might just be me. but doesent the interference start with parasidics from the radio? if so...then when you use an amplifier, it would only make it worse right? so why doesent anyone try the filter before the amp, to clean the signal before amplification? i run an rci-2950, and a grey linear. and have no problems running with the filter inbetween the radio and amp...however, if i remove the filter. all hell breaks loose. the same if i put it after the amp. its a tvi-2k by workman, with adjustable ground traps. what is your opinion? |
1861
Intermediate Member
Username: 1861
Post Number: 380
Registered: 2-2004
| | Posted on Saturday, November 05, 2005 - 8:03 am: |
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EVERYONE HAS THEIR OWN OPINION , ON BASE , I RUN A VECTRONICS AFTER RADIO AND A RF LIMITED FILTER AFTER AMP . BOTH MOUNTED STAIGHT TO UNITS AND GROUNDED |
Hotwire
Advanced Member
Username: Hotwire
Post Number: 686
Registered: 1-2005
| | Posted on Monday, November 07, 2005 - 12:06 pm: |
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Yes I agree the radio produces the harmonics you want filtered. I use my filter connected directly to the rear of radio with a right angle adapter and double male adapter. |
Road_warrior
Advanced Member
Username: Road_warrior
Post Number: 905
Registered: 7-2004
| | Posted on Tuesday, November 08, 2005 - 10:41 am: |
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I installed my LM-TVX2 the same way as
Hotwire has his. |
Bullfrog13x4
New member
Username: Bullfrog13x4
Post Number: 7
Registered: 3-2006
| | Posted on Monday, April 17, 2006 - 3:08 pm: |
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most of the time the asumtion is correct. the radio is normally the culprit of tvi and when you put an amp behind a radio the amp is only going to amplify what goes in to it, however i have seen a few amps that caused the tvi them selves. every time i have seen this it was caused by someone opening the covers and removing or modifying components asumably to get mo-power butt less knowledgable people dont seem to realize that the factory put most of those parts in there for a reason and that the meter might show mo-power butt it is reading the stray freqs as extra power that is bad tvi and not mo-power on the freq of operation. if you are concerned about tvi first check the radio if it is creating undersiable freqs than it must be resolved before you look at the amp.what goes in must come out. or get really hot, hence "smoke". |
Chad
Advanced Member
Username: Chad
Post Number: 785
Registered: 11-2004
| | Posted on Monday, April 17, 2006 - 9:54 pm: |
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What you said is very true but requires "Good radio practice" an overdrivwen amplifier can be a HUGE culprit of "TVI", distortion carries MANY even-order harmonics, no matter what part of the signal chain! I use one filter, right before the meter.
The ONLY reason I bought a TVI filter is because we still have many folks here getting Broadcast TV (very flat land) and are quite happy with it.
I am a firm believer that most of the people who complain are not receiving TVI but quite simply input overload on their consumer devices. Which in turn means that WE... Dont have our antenna's high enough, they are not implemented properly, or we are producing too much "even order harmonics" for the above noted reason.
Lets "say" I had a class C amplifier and it produced many problems within the home (computers, phone line, BUT NOT TV) And lets "say" I was not afraid to "wang it out" with a radio known to be a tad problimatic with that from the get go. But lets also "say" I switched to a cleaner radio, then biased the amp class AB, then did a little antenna work. Guess what happened?
MaMa don't complain  But, we NEVER had "TVI!"
Chad |
