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Message |
    
Jameslarson
Junior Member
Username: Jameslarson
Post Number: 33
Registered: 4-2006
| | Posted on Saturday, April 15, 2006 - 12:15 am: | 
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Does copper sell this?
If not, does copper sell any type of "double shielded" coax |
Tech808
Moderator
Username: Tech808
Post Number: 9745
Registered: 8-2002
| | Posted on Saturday, April 15, 2006 - 12:34 am: |
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Jameslarson,
To view all of the COAX that Copper carries CLICK HERE!
Personally I have never found any reason to spend the extra money for 9913 when the RG-213 has worked for every installation I have ever had from Mobile use or Base use here.
If you want to use the 9913 just do a GOOGLE Search for 9913 Coax.
Hope this helps,
Lon
Tech808
CEF808
N9CEF
CVC#2 |
Jameslarson
Junior Member
Username: Jameslarson
Post Number: 34
Registered: 4-2006
| | Posted on Saturday, April 15, 2006 - 9:17 am: |
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Is coppers RG213U double shielded?
If not, does copper sell any double shielded coax?
Thanks. |
Tech808
Moderator
Username: Tech808
Post Number: 9748
Registered: 8-2002
| | Posted on Saturday, April 15, 2006 - 9:33 am: |
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Jameslarson,
Sorry but no.
Is there some special reason that you need to use double shielded coax?
Lon
Tech808
CEF808
N9CEF
CVC#2 |
Jameslarson
Junior Member
Username: Jameslarson
Post Number: 35
Registered: 4-2006
| | Posted on Saturday, April 15, 2006 - 9:56 am: |
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Yes. I am having bad noise through my mobile radio. I am looking for every way possible to eliminate it. Even if it means using thick stiff coax. |
Dx431
Senior Member
Username: Dx431
Post Number: 1167
Registered: 2-2002
| | Posted on Saturday, April 15, 2006 - 11:33 am: |
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You're going at at it the wrong way. First you have to determine where the noise is coming from. Through the ant, or through the electrical system. You have to go to the source of the noise. Changing coax or putting an inline filter on your radios power leads ain't gonna do it.
You need to filter the noise.
If it's alternator whine, then you need to filter the alternator, if it's the fuel pump, you need to filter the fuel pump. If it's ignition,then change the plug wires, etc....
I think you get the picture..... |
Jameslarson
Junior Member
Username: Jameslarson
Post Number: 38
Registered: 4-2006
| | Posted on Saturday, April 15, 2006 - 12:32 pm: |
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Hi. Well, it's hard to say. because let's say I am in my vehicle with MY engine off, as cars pass by me I can hear THEIR engine noise through my radio. So it seems as if through the antenna. My antenna is grounded as well as it can be and the COAX is mini 8 and is OK. No shorts in the system whatsoever. i was hoping to use double shielded coax to eliminate the above problem. I'm sure it could not hurt. What else can I do if the problem happens with MY car off and I pick up OTHER peoples engines, and the antenna system is good? |
Dx431
Senior Member
Username: Dx431
Post Number: 1168
Registered: 2-2002
| | Posted on Saturday, April 15, 2006 - 1:37 pm: |
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First off all what ant do you have where is it mounted and and how is it mounted? I may have missed this part, but as far as I know, there really isn't a solution for this, If it's coming from passing vehicles, then not alot you can do.
No different then driving through town and picking up static from lights and alarm systems. You'll have to deal with it.
Sorry I couldn't be of more help. |
Hotwire
Senior Member
Username: Hotwire
Post Number: 1168
Registered: 1-2005
| | Posted on Saturday, April 15, 2006 - 3:33 pm: |
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James, What antenna are you using? |
Jameslarson
Junior Member
Username: Jameslarson
Post Number: 42
Registered: 4-2006
| | Posted on Saturday, April 15, 2006 - 5:39 pm: |
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It is a van.
dead center mounted on roof.
Disco disc (2 round discs) with a standard stud mount and "pot belly" spring
Wilson 5' fiberglass antenna.
I get the same problem with other antennas as well.
real frustrating |
Hollowpoint445
Senior Member
Username: Hollowpoint445
Post Number: 1174
Registered: 6-2004
| | Posted on Saturday, April 15, 2006 - 9:50 pm: |
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Why would changing coax stop the antenna from receiving noise? It won't. It can't.
Either your radio has a malfunctioning noise blanker, or it's working fine and you are trying to fix a problem that can only be resolved by using DSP. |
Hotwire
Senior Member
Username: Hotwire
Post Number: 1177
Registered: 1-2005
| | Posted on Sunday, April 16, 2006 - 12:15 pm: |
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Hmmm, just a thought James. On your Wilson antenna does it have the plastic cap on top covering the stinger? Ever get rain in there? One more idea....Is there any corrosion on your battery terminals? Corrosion causes noise for some reason I know with car audio. |
Jameslarson
Junior Member
Username: Jameslarson
Post Number: 48
Registered: 4-2006
| | Posted on Sunday, April 16, 2006 - 7:51 pm: |
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I figured it can't hurt to have double shielded coax. Even if it only helps 5%. Plastic cap is on. No water. Some "dullness" on the battery terminals, but not corrosive. I plan on putting an optima red top in there anyway, and getting rid of the battery that is in there now. The ANl/NB works on AM (Not SSB), but I do not want to use ANl if I don't have to. I seem to lose the weak stations out there when I do. maybe the new coax and battery may help. Let's see. |
Tech237
Moderator
Username: Tech237
Post Number: 285
Registered: 4-2004
| | Posted on Monday, April 17, 2006 - 9:37 am: |
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James,
Do the following test.
Sit in you care with the coax connected to the radio but no antenna on. Do you hear the noise? If you can the the most likely cause is leaky coax and if not the antenna is most likely the problem. |
Hotwire
Senior Member
Username: Hotwire
Post Number: 1189
Registered: 1-2005
| | Posted on Monday, April 17, 2006 - 1:46 pm: |
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Mmmm, Oh well it was just a thought. Going Optima will improve on some noise. It has cleaner power. I noticed a slight improve with mine and the car audio buffs claim a major improvement. If you decide to go new coax try rg213 or if you prefer 9913. Important if you or someone else solders on your ends to be sure all the little holes that expose shield get filled in real good with solder. Also be sure to use good pl259 ends preferably the Amphenol brand. I feel your pain man. Nothing worse than annoying noise from your radio especially in the mobile! Like whats the use if you can get good transmit range when you can't even hear the station way out there? I really hope you fix it soon. Worse thing that can happen is you sale the Grant and get a new radio or keep the Grant and get a new radio. GOOD LUCK! 73 |
Funtimebob
Intermediate Member
Username: Funtimebob
Post Number: 191
Registered: 5-2002
| | Posted on Monday, April 17, 2006 - 2:51 pm: |
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why go with beleden soda straw coax? better off getting another manufacturers eqiivalent such as RF-9913. |
Tech237
Moderator
Username: Tech237
Post Number: 306
Registered: 4-2004
| | Posted on Thursday, April 27, 2006 - 3:12 pm: |
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Hollowpoint - coax with a poor sheild coverage (and some coax out thers has a very low level of shield coverage can cause the coax to pick up noise. It is always better to buy coax with the best possible shield you can get.
Over the years I have seen coaxs that range from an open weave shiled you could almost drive a car thru to ones so tight that you have to use a pointed tool to pick it apart to expose the inner conductor. I have always gone for the latter when it is available. |
Hollowpoint445
Senior Member
Username: Hollowpoint445
Post Number: 1199
Registered: 6-2004
| | Posted on Friday, April 28, 2006 - 10:37 am: |
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My point was that if it was receiving RF through the shield of the coax it would also receive it through the antenna, and even 100% shielded coax cannot prevent noise received by the antenna. Changing the coax won't resolve the noise issue while stopping the noise at it's source will.
Of course you should use the best quality you can afford, but I think that's beside the point here. |
Tech237
Moderator
Username: Tech237
Post Number: 312
Registered: 4-2004
| | Posted on Friday, April 28, 2006 - 3:31 pm: |
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Not really - as the noise is external to the car you cannot kill it at the source(s) and that is also why I suggested that he see if he can hear the noise with the antenna removed but the coax still connected.
Trust me I have know coax to pick up ignition noise from passing cars when no antenna has been connected. |
Jameslarson
Member
Username: Jameslarson
Post Number: 93
Registered: 4-2006
| | Posted on Friday, April 28, 2006 - 4:38 pm: |
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Well, minus going nuts with crazy spark plugs and going berzerk on the engine components, I am just going to have to simply live with it. It went down slightly with a 102" whip, hopefully the better coax helps a little. It gets 95% eliminated with the ANL on, but then I lose some distant stations. Oh well, could be worse. thanks. |
Hollowpoint445
Senior Member
Username: Hollowpoint445
Post Number: 1200
Registered: 6-2004
| | Posted on Friday, April 28, 2006 - 8:17 pm: |
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Obviously you can't stop the noise at the source if it's another vehicle. If there is enough RF noise to make it through the shield, there will certainly be enough to make it to the antenna. Shielding won't cure anything in this particular case, and it's a worthless exercise in my opinion.
I drove around with an RF silent car for several years. I used bypass capacitors to kill all of it's RF noise. The ONLY noise I heard was received through the 102" antenna in the middle of my roof. I could hear some cars coming from hundreds of yards away. Fortunately my radio had a good NB and it would eliminate the majority of the noise when I turned it on. Yes, it did kill some faint signals, but that's the price you have to pay. Either accept it or buy a DSP unit. |
Tech237
Moderator
Username: Tech237
Post Number: 314
Registered: 4-2004
| | Posted on Saturday, April 29, 2006 - 10:25 am: |
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Hotwire as much as I hate to say it but can be wrong on that. The antenna maybe 102" long, the coax is at least that long and probably longer and therefore a leaky shield can and will pickup as much or more noise than the actual antenna.
As an example one of the peole invovled with State Emergency Services (in Australia) had a generator on his farm and everytime he drove near all his radios were useless. He had CB, HF Commercial and VHF Commerical radios. We tried severla experiments including removing his antennas - all to no avail. I removed one of his PL-259 to make sure his plugs were properly done and found out he had used cheap coax with about 50% shield coverage.
Over the next week, I replaced all his cables with coax that had around 95% shield coverage and after that he could park alongside the generator and the worst we ever was was an S2 noise level on the HF Commercial (running on 2.767MHz).
If I was to go back over my 30 years in the trade I could certainly find other instances were replacing coax with better quality removed noise problems. The othe advantage of replacing open sheilded coax with a tighter sheilded one is, of course, you then have less chance of causing problems to other people too. |
Dmh
Junior Member
Username: Dmh
Post Number: 29
Registered: 5-2002
| | Posted on Monday, June 25, 2007 - 8:12 am: |
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I run my ANL "on" all the time . Maybe I 'm wrong here but, on a mobile I thought most everyone runs the CB with the ANL on . The ONLY time I turn my ANL off is if I'm parked with the motor off picking up distant stations. Too much static if you are in a rolling mobile . |
