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Message |
    
Hoss
New member
Username: Hoss
Post Number: 8
Registered: 1-2006
| | Posted on Thursday, January 26, 2006 - 5:03 pm: | 
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Does anyone know if these low pass filters are any good? I need to try something my neighbor just told me that he has been getting TVI and phone problems just in the last 3 days. I have not changed anything on my end does anyone have a clue to what would make this happen all of a sudden. He said that he can hear every word that i say on the phone as well as the tv. I am talking on a Saturn that i run at 2 Watts and a 30 watt swing. I have no filter in line and i do not have tvi at my house or phone trouble. Any help or suggestions would help |
Wildrat
Advanced Member
Username: Wildrat
Post Number: 717
Registered: 12-2003
| | Posted on Thursday, January 26, 2006 - 5:30 pm: |
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Read a couple of the post just below this one addressing the same problem.
Mark |
Bruce
Senior Member
Username: Bruce
Post Number: 3465
Registered: 9-2003
| | Posted on Thursday, January 26, 2006 - 7:00 pm: |
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Hoss
1) a FILTER will not help phone problems unless its on the PHONE
2) a high pass might help on the tv |
Rldrake
Junior Member
Username: Rldrake
Post Number: 34
Registered: 1-2006
| | Posted on Thursday, January 26, 2006 - 10:50 pm: |
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Your mic gain is set too high...causing splatter! A 2 watt carrier, when fully modulated, should not be 30 watts PEP. PEP should be 8 watts maximum. You are overdriving it. |
Hoss
New member
Username: Hoss
Post Number: 9
Registered: 1-2006
| | Posted on Friday, January 27, 2006 - 12:17 am: |
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Why whould this just start. All of my settings are the same for the last 6 months. As for the Viking is this a GOOD FILTER OR IS THE PARA DYNAMICS JUST AS GOOD? I would rather spend 60.00 Than 20.00 For the filter if it is a good one!!!!!!
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Hoss
Junior Member
Username: Hoss
Post Number: 10
Registered: 1-2006
| | Posted on Friday, January 27, 2006 - 12:18 am: |
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My mic Gain is at 5 and the mike is half way |
Rldrake
Junior Member
Username: Rldrake
Post Number: 35
Registered: 1-2006
| | Posted on Friday, January 27, 2006 - 1:53 am: |
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Mic gain at "5". Well try "2". Bring the PEP down to where it belongs. Mike is "half way". Half way to where? Besides the splatter, check for damaged feedline or loose connector. Also, check for RF on the outside of the shield of the unbalanced feedline (coaxial)...a radiating feedline can produce unwanted harmonics. A good filter, such as DCI or Inrad, around $500 to $700. Your transceiver should have adequate suppression of spurious emissions without additional filtering in the feedline. You're running a simple two-way radio, not a repeater. |
Dx431
Senior Member
Username: Dx431
Post Number: 1137
Registered: 2-2002
| | Posted on Friday, January 27, 2006 - 2:41 am: |
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Is all your equipment grounded?
Ant, radio, etc. etc.......
That would be a good place to start.
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Hotwire
Advanced Member
Username: Hotwire
Post Number: 833
Registered: 1-2005
| | Posted on Friday, January 27, 2006 - 6:47 am: |
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Hoss,
I use a Nye Viking. They are pretty big compared to others and the most solid built I ever seen. If you can get your hands on one then get it! |
Hotwire
Advanced Member
Username: Hotwire
Post Number: 834
Registered: 1-2005
| | Posted on Friday, January 27, 2006 - 7:09 am: |
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Hey Hoss, Everyone needs a filter so go ahead with the Viking. Be sure its good for the 10-11 meter range. Also check your connections for looseness and cracks or cuts in your coax. Check grounds. Ask the neighbor to check his wires and connections also. Has anything such as a car been put near your antenna. This could disrupt the antennas radiation field possibly reflecting RF more toward the nieghbor. Just bringing this up because you say you never had trouble in the past, just recently. I have had simular issues with RFI TVI in the past. Hope I could help and maybe spark up some ideals in your head. I know how this can be frustating! Good Luck. CEF491 |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1202
Registered: 7-2004
| | Posted on Friday, January 27, 2006 - 8:23 am: |
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TVI filter will not help going over phones. |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1203
Registered: 7-2004
| | Posted on Friday, January 27, 2006 - 8:34 am: |
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Has your neighbor purchased a new phone
or answering machine lately? New TV? A new
VCR? Or done anything different in these
lines? Ask him and find out please if possible.
Make sure your coax connections are all tight
on your end. Grounds are still connected good.
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Hoss
Junior Member
Username: Hoss
Post Number: 11
Registered: 1-2006
| | Posted on Friday, January 27, 2006 - 10:37 am: |
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Thanks Hotwire & Road Warrior for the info and being nice about it! As for my mic being set at half way it is a D-104 set at half way up just a little common sense would tell you that rldrake its only a simple two way radio not a repeater |
Dale
Intermediate Member
Username: Dale
Post Number: 282
Registered: 12-2002
| | Posted on Friday, January 27, 2006 - 11:36 pm: |
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well thats a problem ive always found .i learned that if i keep my d104 turned all the way down and mic gain on radio all the way up it helps,thats with just the tvi.most cases tvi is caused by overmodulation id make sure your audio limiter is in radio best place 2 start imho
dale/cef426 |
Bruce
Senior Member
Username: Bruce
Post Number: 3472
Registered: 9-2003
| | Posted on Saturday, January 28, 2006 - 5:26 am: |
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TVI ? OR PHONE ?
If your comming through the PHONE is it hard wired or a cordless one? TVI is the TV on a cable or a ANTENNA?
Overmodulation will not HELP but it is not going to be the CAUSE ..... |
Dale
Intermediate Member
Username: Dale
Post Number: 284
Registered: 12-2002
| | Posted on Saturday, January 28, 2006 - 11:57 am: |
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i was meaning overmodulation=clipped limiter,snip job.this is 9times out the 10 the culprit.especially if the guy has cable/satilite
i never said overmodulation will help
dale/cef426 |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 1102
Registered: 9-2004
| | Posted on Saturday, January 28, 2006 - 4:56 pm: |
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how about trying some ferrite beads on the neighbors phone and TV?
matt |
Rldrake
Junior Member
Username: Rldrake
Post Number: 36
Registered: 1-2006
| | Posted on Sunday, January 29, 2006 - 12:20 am: |
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Nye Viking filter? If such filter is working, it would cut-out "11 meters" cb band altogether. D-104? A high impedance mic on a solid state "cb"??? Turned way up like that=SPLATTER ! "Check grounds"? What for? Poor "grounds" don't generate spurious emissions. Overdriving the audio chain will. |
Hotwire
Advanced Member
Username: Hotwire
Post Number: 837
Registered: 1-2005
| | Posted on Sunday, January 29, 2006 - 3:16 am: |
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Rldrake. No. The Nye Viking TVI filter I use has 80dB min attenuation above 50MHz. It is a LOW pass filter which means those freqs below 50MHz (11 meters) WILL pass through the filter. Its simple, anything above 50MHz (harmonics) coming from my CB will not pass through the filter. To learn more about low pass filters do a search here at Copper. 73 |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1212
Registered: 7-2004
| | Posted on Sunday, January 29, 2006 - 4:35 pm: |
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Check grounds? What for?
Having to long of a radio RF ground-wire could
cause wire to radiate and cause problems.
And there are alot more causes then just a over-driving mic.
But, i agree it doesn't help to drive mic to
the screaming point. |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 1115
Registered: 9-2004
| | Posted on Monday, January 30, 2006 - 12:24 am: |
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hotwire, you are too funny!
somehow i think RLDRAKE knows what a low pass filter is! LOL
check out a few of his past posts and you'll see what i mean.
this man knows some stuff.
sorry if this seems offensive guys; i dont mean it that way. it's just that when i read RLDRAKE's post and then yours under it; it made me laugh.
thanks guys,
matt |
Rldrake
Junior Member
Username: Rldrake
Post Number: 37
Registered: 1-2006
| | Posted on Monday, January 30, 2006 - 1:30 am: |
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Harmonics that would get into a telephone would be much, much lower in frequency than 27 mhz. So some filter that "filters" vhf and up would serve no purpose. A low end, feedline filter, would have passband of no greater than 2 mhz. I would have no reason to research "filters" at "Copper". A basic knowlege of such was required when I obtained my novice ticket in 1964...as was knowing what the maximum PEP of a fully modulated phone carrier would be. |
Hotwire
Advanced Member
Username: Hotwire
Post Number: 844
Registered: 1-2005
| | Posted on Monday, January 30, 2006 - 8:00 am: |
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KV, ....LOL, No offensive taken at all. I'm just tryin to stay on the topic of Hoss's post. He asked about the Viking TVI filter. Rldrake its great that you earned your license in 1964. I'm sure you have great knowledge about all this. Some of us are just regular cbers with just a little knowledge and are looking for help without someone trying to confuse us or act like we don't know what we are doing!
If I understand this correctly Hoss stated that he has not had the interference issue in the past. Just until recently did his trouble start up and all settings are the same as usual. Now for some reason the interference started and I bet it is something simple and not modulation because it was not the case before. I would start with good fresh coax.Maybe check cable tv lines next door. As far as the telephone bleedover I have no ideal. Never had to deal with it in 20 years experience I myself have under my belt.
Regardless I hope Hoss gets back in the saddle soon and gives Hotwire a shout on the good ol citizens band(27.115)! I'll be readin da mail! 73 CEF491 |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1214
Registered: 7-2004
| | Posted on Tuesday, January 31, 2006 - 12:22 am: |
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I've wrecked neighbors phones, computers, police scanners, TVs with my Mod limiter intact.
That was with a Imax 2000. Changed antennas
and all RFI/TVI stopped. I'm going to do alot
of experimenting here with a few different
antennas i've had trouble with in the past.
My neighbors will love me...LOL...
Hosses neighbors phone is improperly acting
as a reciever. Whether it be overload or a
faulty phone. I've heard the Viking is a good
filter. |
Hotwire
Advanced Member
Username: Hotwire
Post Number: 849
Registered: 1-2005
| | Posted on Tuesday, January 31, 2006 - 8:00 am: |
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Road Warrior, Ya know I have heard that before about the Imax 200o in the past. The Antron99 too from outside the forum.
I wonder why a fiberglass antenna would cause tvi more so than an aluminum antenna? Seems like it would be the same. |
Bruce
Senior Member
Username: Bruce
Post Number: 3481
Registered: 9-2003
| | Posted on Tuesday, January 31, 2006 - 9:10 am: |
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I wonder why a fiberglass antenna would cause tvi more so than an aluminum antenna?
I dont buy this It has to have something to do with poor design. I have used many VHF/UHF fiberglass antennas with great results. Right now I use a 6/2/440 one running 100-200 watts to it with NO TVI at all. |
Rldrake
Junior Member
Username: Rldrake
Post Number: 38
Registered: 1-2006
| | Posted on Tuesday, January 31, 2006 - 10:49 am: |
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Put the "Satern" on the FM or CW mode. See if the neighbor then has the interference when you are transmitting. If not, it clearly indicates splatter from overdriving the little rig while on standard "cb" modes (amplitude modulated). |
Road_warrior
Senior Member
Username: Road_warrior
Post Number: 1217
Registered: 7-2004
| | Posted on Tuesday, January 31, 2006 - 12:05 pm: |
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Yes, i think it maybe the design of a antenna.
The fiberglass is just a shell for the
copper wire antenna inside. And really can not
be blamed because it's made of fiberglass.
I'm going to experiment and try to figure
some of this stuff out. Why are fiberglass antennas noisy in one location, but, not in another? Just things that bug me...LOL
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