| Author |
Message |
    
Tech808
Moderator
Username: Tech808
Post Number: 10093
Registered: 8-2002
| | Posted on Thursday, May 25, 2006 - 6:55 pm: | 
|
Moderator Note!
I am re-posting this for Road_warrior as he tried to post it to an Archived Topic.
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Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1517
Registered: 7-2004
Posted on Thursday, May 25, 2006 - 4:07 pm:
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I bought the LM-TVXZ TVI filter about 10
months or better ago. It shorted out today
and luckily i caught it before it blew my
finals out of my 2995dx.
Rivets were also coming loose and the thing
just sets there. Into the garbage this thing
goes!
_______________________________________________
Lon
Tech808
CEF808
N9CEF
CVC#2 |
Tech808
Moderator
Username: Tech808
Post Number: 10094
Registered: 8-2002
| | Posted on Thursday, May 25, 2006 - 7:09 pm: |
|
Road_warrior,
Do not throw it out.
In well over 30+ years I have never see or heardof an MTI Low Pass Filter short out unless it had over 1KW or 4 KW depending on the model thrown into it.
I would guess just one of the SO-239's went bad from connecting and un-connecting it.
Easy FIX just install a new SO-239 or replace both of them for under 8 buck's.
I cannot understand how the rivets would come lose if you never move it but even if they do come loose they will not cause a short as they have No contact with the coils mounted on the board inside.
Here are my MTI Filter's I use and the older one 4KW is from the late 60's and still working great as well as the other 6 MTI 1KW ~ LM-TVX2 Low Pass Filter's I have in line.
The MTI TVI Filter's are the best I have ever found or used. 
And if you really do not want to keep it SEND it my way as I will install 2 new SO-239's and continue using it.
Hope this help's,
Lon
Tech808
CEF808
N9CEF
CVC#2 |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1520
Registered: 7-2004
| | Posted on Thursday, May 25, 2006 - 8:50 pm: |
|
It quit working. When placed in-line or
like i had it, coming straight out of radio.
It acts like there is no antenna hooked up.
Dead! I tried another double male connector with no luck. Probably something came loose inside.
I will have my friend look at it. Because it's
no good to me this way. |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1521
Registered: 7-2004
| | Posted on Thursday, May 25, 2006 - 8:52 pm: |
|
Oh sorry about posting in the wrong place.
I didn't realize it because i got it
from doing a search on the TVI filter.
Sorry!
Moderator Note!
No Problem |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1522
Registered: 7-2004
| | Posted on Thursday, May 25, 2006 - 9:05 pm: |
|
The most that got put into the filter was 150 watts PEP. It never got disconnected a bunch of time either.
Been on radio since i bought TVI Filter.
Today i was during chores in the house and
noticed receive dropped way down on radio like antenna was unhooked. Like i mentioned above i tried a new double male connector to rule
out that possibility. I had it coming straight out of radio. I even tried a jumper on it to place in-line. Still Silence. Hooked a old TVI Filter i had straight out of radio and it worked fine.
I guess short circuited was probably the wrong
word to use. It died... |
Chad
Advanced Member
Username: Chad
Post Number: 858
Registered: 11-2004
| | Posted on Friday, May 26, 2006 - 10:22 am: |
|
There's just a few coils inside, pop it open and take a look-see, it could be a simple cold solder joint! I have the same filter and it has worked out for me. Aside from lightning or cold solder not much can go wrong with them 
Chad |
Dale
Intermediate Member
Username: Dale
Post Number: 424
Registered: 12-2002
| | Posted on Friday, May 26, 2006 - 12:05 pm: |
|
maybe im just i dont know any better but i thought filters were last piece of equiment iline
besides antenna
radio,diver'if needed',amp,meters,filters,antenna |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1532
Registered: 7-2004
| | Posted on Friday, May 26, 2006 - 12:26 pm: |
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The Filter is fixed, my friend just dropped it off on his way to work.
Bad solder joints within the unit was the cause. |
Tech808
Moderator
Username: Tech808
Post Number: 10106
Registered: 8-2002
| | Posted on Friday, May 26, 2006 - 12:56 pm: |
|
Dale,
A TVI Filter should ALWAYS be connected directly to the Radio via a double male connector.
(NO JUMPERS)
Hope this help's
Lon
Tech808
CEF808
N9CEF
CVC#2 |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1533
Registered: 7-2004
| | Posted on Friday, May 26, 2006 - 2:05 pm: |
|
I only run a 2995dx base with nothing else
in-line. TVI filter is hooked directly into
radio using a double male connector.Then
coax plugs into other end of filter.
My opinion is the less you have in-line, the
less trouble you will have.
But, i do have a question?: For Tech 808 or
whoever wants to answer.
Shouldn't the TVI filter be placed in-line after a Amp??? In my case it is. But, if someone
has a separate amp in-line using a jumper.
What then??? Does it still get placed directly into radio or placed after amp? |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1540
Registered: 7-2004
| | Posted on Sunday, May 28, 2006 - 12:53 am: |
|
Ok, this is out of the ARRL RFI Handbook (Pg 3.7)
If a amplifier is used, the filter should
be installed after the amplifier, between
the amplifier and antenna tuner.
If you install a filter it is imperative that
a low SWR (1.5 to 1 or so) exists on your feedline at the filter. With a high SWR the
filter effectiveness may be reduced. In addition to increased spurious output, high swr can cause filter failure from increased feedline voltage.
My problem was the solder joints. 1:1:1 measured with my filter on my rig. 1:2:1 using high power. |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1546
Registered: 7-2004
| | Posted on Sunday, May 28, 2006 - 9:50 pm: |
|
My friend touched up the joints in the
LM-TVXZ TVI filter and it has been working good
since i put it back on radio.
I wouldn't of threw it away Lon...LOL...
Just got upset because i really liked this filter
and figured nothing could be done to fix
it. |
Tech808
Moderator
Username: Tech808
Post Number: 10132
Registered: 8-2002
| | Posted on Sunday, May 28, 2006 - 10:00 pm: |
|
Road_warrior,
Glad to here it is repaired and working ok again.
Lon
Tech808
CEF808
N9CEF
CVC#2 |
