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Old 05-06-2013, 11:47 AM
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Default Filter question..

Hey guys, hopefully this is in the right forum section.. I figure it fits best here, since I am trying to monitor only Civilian and Military aircraft.

I've been getting a lot of interference/bleed over of what sounds like local fire dispatch of some sort, maybe even a bus service or something.. its only for a couple hours of the day, 7-9am mainly, then randomly through the day I will hear voice, and sometimes what sounds like "motorboating", I call it TMR noise, on many of my MilAir frequencies, but mostly 311.00AM, which is the ME ANG ops freq..

So, my question, does anyone know of a decent filter I could purchase, that would block out everything between the Civilian and Military air bands?

Or one better, does anyone know of a filter that would block everything in between the Civilian and Military bands, as well as everything above 380Mhz??

Thanks in advance.
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Old 05-06-2013, 12:19 PM
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I would wonder about images.

What kind of radio you using?
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Old 05-06-2013, 12:22 PM
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Originally Posted by corbintechboy View Post
I would wonder about images.
What do you mean by that? Just a note of interest, there is a pager/cell tower about 4 KMs away, direct line of site from my antenna, it may even be traditional radio transmitted from there as well.

I am using a number of radios, but I mainly see the issue on my BCT-15x, and also get it on my 996XT.

Here is an audio clip of the noise : http://audioboo.fm/boos/1374435-stupid-noise

Last edited by NE1C4NSC4N; 05-06-2013 at 12:31 PM..
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Old 05-06-2013, 12:32 PM
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Images are when you feed a radio to much signal and the radio starts to show stations where stations are not located. Common problem.

Did you try looking somewhere like universal radio for some sort of filter?
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Old 05-06-2013, 12:40 PM
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Images are when you feed a radio to much signal and the radio starts to show stations where stations are not located. Common problem.
What would be the best way to get rid of it?

Quote:
Originally Posted by corbintechboy View Post
Did you try looking somewhere like universal radio for some sort of filter?
I was looking at Scannermaster, and they do have a filter for the Civilian airband only, and they used to carry a Milair one as well, but its no longer produced. Plus I would really like one that does both in one..
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Old 05-06-2013, 7:49 PM
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Pagers and such are notorious for being the cause of many overloading issues. Both PAR electronics and Scanner Master have filters that will knock this stuff out.

It's a little hard to generalize where this might be coming from - the regulations in NS aren't necessarily the same as the ones here in the States - but a good guess might be in the common carrier areas, around 152 and 157 Mhz VHF and around 452 Mhz UHF. You're going to need to do a little homework to find out who owns that tower (use TAFL?), but in either case, filters are available to KO this sort of junk.

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Old 05-07-2013, 2:10 PM
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To help you find the offending frequency, try enabling close-call. Also use the bandscope function. This might help you track it down faster so you can order a custom filter.

Since you are only interested in civil / milair with these radios, you *might* be able to get away with a simple quarter-wave stub, even though it has it's own insertion loss. But you'd want to know what frequency the offending signal is on before cutting one.
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Old 05-07-2013, 7:19 PM
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Thanks for the info/suggestions guys, I'm thinking its pagers, or some old VHF fire frequencies they have kept active in the out lying areas of the city/county.I'll have to do some investigating as you guys suggested.

I found the filters I think I need at PAR, so its great to know they have them available for both civ/milair, and the prices are decent.
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Old 05-07-2013, 7:30 PM
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This is one of a number of listings on the TAFL site, would I be right in assuming 148 is the frequency?

444354 0634804 15.3 0.0 0.0 148 93 0 4 B 634925263 6 080700800 CAPITAL DISTRICT H FB CV

Here's another:

444354 0634804 18.8 9.0 0.0 148 59 0 CGP346* 3 B 632217190 6 080006990 HALIFAX REGIONAL W FBFXCV XJN892 9595 7K60FXE 20110408 5.0 14.8 8400 1

Last edited by NE1C4NSC4N; 05-07-2013 at 7:34 PM..
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Old 05-09-2013, 10:11 AM
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I am not really undestanding what exactly this is from TAFL. You must be using some type of geographical search which makes sense based on your problem... but I dont think these are the frequencies I looked up plain 148 as in 148.00 then 148.93 and 143.59.... but there is nothing near on 148.93 and 148.59 isnt a valid Canadian frequency, and nothing is found for 148.00.... so all in all I haven't any idea what these are.


Later..... I looked up XJN892 and searched that way and it is Halifax Water Commission in Hammonds Plains . This is a MotoTrbo site

163.605000 168.585000 6 HAMMONDS PLAINS, NS, 18 YANKEETOWN HALIFAX REGIONAL WATER COMMISSION ATTN: PETER WHITE
164.595000 169.575000 6 HAMMONDS PLAINS, NS, 18 YANKEETOWN HALIFAX REGIONAL WATER COMMISSION ATTN: PETER WHITE


I have no idea how you came up with your listings but if you are close to that site maybe you are getting MotoTrbo noise.. it sounds something like that TMR control channel noise...
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Last edited by novascotian; 05-09-2013 at 10:16 AM.. Reason: more info...
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Old 05-09-2013, 5:16 PM
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Quote:
Originally Posted by novascotian View Post
Later..... I looked up XJN892 and searched that way and it is Halifax Water Commission in Hammonds Plains . This is a MotoTrbo site

163.605000 168.585000 6 HAMMONDS PLAINS, NS, 18 YANKEETOWN HALIFAX REGIONAL WATER COMMISSION ATTN: PETER WHITE
164.595000 169.575000 6 HAMMONDS PLAINS, NS, 18 YANKEETOWN HALIFAX REGIONAL WATER COMMISSION ATTN: PETER WHITE


I have no idea how you came up with your listings but if you are close to that site maybe you are getting MotoTrbo noise.. it sounds something like that TMR control channel noise...
Thanks for doing some digging Nova, what I posted was what I found, I'm not sure it was the right site, plus there was a bunch of different documents to download, that had information, and I wasnt sure what I was looking for except that tower I posted. I am closest to the "Hammonds Plains, Yankeetown Road" tower, that one you listed I believe is closer to Bedford.

As for the noise I'm getting, its kind of a mix, it can be moto noise like you say, and sometimes I will even hear them calling out a Tanker, like Tanker 12 and then it will cut off before they talk more, or it will be calling out an address like it was a bus route or something.. Im begining to think there is a VHF repeater of some sort on that tower, and its just magnifying everything VHF for me, since Im so close.

Do you have a link to the site you got that info from??

Last edited by NE1C4NSC4N; 05-09-2013 at 5:22 PM..
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Old 05-09-2013, 7:06 PM
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It is on the opening page of my site.... I searched TAFL by single frequency first, in case those were frequencies, then when I noticed that callsign I searched by call sign....

That site is I think the NS Govt IMRS site and likely a bunch of other things.... would be interesting to search by the coordinates of that site.... which of course is maybe what you already did...

Later edit.. .this is what I found... in the range 136 to 869 MHz


138.555000

142.500000

6

HAMMONDS PLAINS N.S.

Stock Transportation Ltd.

XLP561



139.920000

412.262500

6

HAMMONDS PLAINS, NS, YANKEETOWN RD

CAPITAL DISTRICT HEALTH AUTHORITY Attn: Natalie Klaus, IT Voice Svcs

CKO722



140.670000

417.262500

6

HAMMONDS PLAINS, NS, YANKEETOWN RD

CAPITAL DISTRICT HEALTH AUTHORITY Attn: Natalie Klaus, IT Voice Svcs

CKO722



143.565000

148.555000

6

HAMMONDS PLAINS NS

NS Dept. of Trans & Infrastr. Ren. Public Safety & Field Comm. Office

XML504



151.895000

154.160000

6

HAMMONDS PLAINS NS

NS Dept. of Trans & Infrastr. Ren. Public Safety & Field Comm. Office

XML504



152.060000


6

HAMMONDS PLAINS, (HRM), N.S.

HALIFAX REGIONAL MUNICIPALITY FIRE SERVICES- Attn:John Webber

XJG955



163.605000

168.585000

6

HAMMONDS PLAINS, NS, 18 YANKEETOWN

HALIFAX REGIONAL WATER COMMISSION ATTN: PETER WHITE

XJN892



164.595000

169.575000

6

HAMMONDS PLAINS, NS, 18 YANKEETOWN

HALIFAX REGIONAL WATER COMMISSION ATTN: PETER WHITE

XJN892
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Last edited by novascotian; 05-09-2013 at 7:15 PM..
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Old 05-09-2013, 7:41 PM
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Wow..lol, thanks for posting all that. That all looks similar to what I found, without the frequencies.. the site I used was for all of Canada I think.

The Stock transportation seems to fit the bill, since I'm hearing about pic ups and drop offs at random addresses.. And HRM Fire is there too, so that would explain most of what I'm hearing..

That's awesome! Thanks Nova(its Bill right?), I know for sure now what I should be looking for filter wise. Thanks everyone for the help!
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Old 05-10-2013, 9:34 PM
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Wirelessly posted (IUC(U;iOS 6.0;Zh-cn;320*480/UCWEB8.2.0.116/42/997)

I want a FM trap
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