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Question about scanning interference w/MT1000's

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joekansas

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Jul 12, 2007
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120
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Kansas
Our company is doing away with MT1000's (VHF) because they won't narrow band. I saved one from the dumpster and had the radio man program it to receive a list of about 10 frequencies. I had him enable scan. I use it as a heavy duty, loud police scanner.

I have a problem with interference it seems. If I have it setting anywhere near me, scanning, in front of this computer screen (flat panel monitor)- within a close to 10 foot radius, it will stop scanning and it breaks the squelch and won't quit. If I stand somewhere inbetween the two, it will quiet down. If I come set back down at the computer, it starts acting up again. If I put it behind the monitor in a certain position, it will go back to quiet and scan.

It does this with a laptop, also. If I grasp around the antenna and hold it just right, it will act normal.

Another thing~ if I take it in the car (2000 Chrysler 300m) it will sometimes do the same thing. I have to hold it up by the window or windshield to get it to stop, or grasp around the antenna.

I am quite clueless about what the exact cause of the problem, but I was wondering if it would stop if I was to have had the radio man program in the PL codes for the L.E.O. freq's I am scanning. I don't have the alarm enabled on my vehicle, and I thought maybe it was still emitting some sort of electrical "noise" and disturbing the walkie.

I have a narrowbanded HT1000 that I still use at work that he programmed the same receive only LEO freq's in to, and it will do the same thing- stop scanning and break the squelch until I get it away from in front of these monitors or grasp around the antenna.

What are these computer monitors and my car emitting that is causing these radios to act up like they are? Like I say, if I get about 10' away from the monitor, it quits. Get out of the car, and the problem quits. I don't seem to get any interference from the plain old Pro-2050 setting in the room.

Who knows.......? By the way, the freq's range from 154.600 to 155.680 if it makes any difference.
 
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SteveC0625

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Radios and computers don't get along. Computers put out rf on all kinds of frequencies, and if the right radio gets too close, squelch opens and you get the noise.

My new iPhone lives on my belt in a swivel holster. Right next to it is my Minitor V. If I rotate the iPhone to a vertical position, the Minitor goes nuts when in monitor mode, and I suspect it is equally messed up if I set it to alert mode. But if I rotate the iPhone to a horizontal position, the interference stops.

If I boot up the older desktop computer and turn on the CRT monitor, it drives the pager and my portables nuts if they are too close. So I keep them on the other side of the room.

Haven't had any problems in the car or truck with any of my gear yet. I suspect your car may have an onboard computer that is leaking out some electrical interference that your portable doesn't like. That or a lot of noise from the alternator is getting into the radio.

I've just learned to live with it.
 

GTR8000

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BEE00
Nothing unusual, electronics emit RFI constantly. Sometimes it doesn't bother certain receivers, other times it does. It also depends, obviously, on what frequencies the RFI is strongest on as compared with what frequencies you are monitoring.

Programming the PL/DPL will normally help, although the radio might still miss transmissions if the RFI is too strong for the desired signal to break squelch.

Make sure the radio is programmed in either Priority PL or Non Priority PL Channel Scan mode, otherwise it will ignore the PL/DPL while in scan mode and will instead revert to CSQ.
 

62Truck

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Aug 13, 2005
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1,448
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Uranus
and another thing, The MT1000's can only hold 8 channels in the scan list too, just wanted to make sure you're away if you feel that you might be missing some traffic on the other 2 channels.
 

joekansas

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Jul 12, 2007
Messages
120
Location
Kansas
Yeah, I printed off some info about the MT1000 awhile back and I recall reading that. I am not sure exactly what is and what isn't scanning at this time. It seems to get the important stuff.....
 
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