Intercity Fire Interference

scanningisfun · #1 (**permalink**) 01-02-2013, 4:46 PM

Some guy is on the intercity repeaters being stupid.

Jacob

bluefox2163 · #2 (**permalink**) 01-03-2013, 1:14 PM

yep i heard that to eary evening sounded like a cb'er

scanningisfun · #3 (**permalink**) 01-03-2013, 2:02 PM

Out of all the times he could have done this, it was during an actual incident while the repeaters were being legitimately used. Not very smart.

Jacob

kmacinct · #4 (**permalink**) 01-04-2013, 4:32 PM

I have made it a point in my scanner and my mobile radios, to include the repeater inputs in a special bank. Had an incident not so long ago with a repeater being jammed, where simple basic signal strength tracking got me to the area of origin, then it magically stopped... (Did they see me)?

Rt169Radio · #5 (**permalink**) 01-05-2013, 8:21 AM

Quote:

Originally Posted by kmacinct

I have made it a point in my scanner and my mobile radios, to include the repeater inputs in a special bank. Had an incident not so long ago with a repeater being jammed, where simple basic signal strength tracking got me to the area of origin, then it magically stopped... (Did they see me)?

How does that work? By signal noise?

scanningisfun · #6 (**permalink**) 01-05-2013, 11:08 AM

Quote:

Originally Posted by Rt169Radio

How does that work? By signal noise?

You can use a directional antenna on the input frequency to locate the interference. This is one of the things the FCC does. The person causing the interference has to be doing it often for you to track the signal effectively.

Jacob

izzyj4 · #7 (**permalink**) 01-05-2013, 1:24 PM

Which intercity repeater, the UHF ones?

scanningisfun · #8 (**permalink**) 01-05-2013, 1:31 PM

Quote:

Originally Posted by izzyj4

Which intercity repeater, the UHF ones?

They are linked. You could hear it on VHF, UHF 400, and UHF 800.

Jacob

scanningisfun · #9 (**permalink**) 01-05-2013, 5:11 PM

Now it's CSPERN lol. Except it's an officer with a naughty mouth.

cg · #10 (**permalink**) 01-05-2013, 9:22 PM

It was likely the VHF Intercity because after he played on that freq for a bit, he went to the DPH VHF channel and broadcast there for a few more minutes.

chris

scanningisfun · #11 (**permalink**) 01-05-2013, 9:48 PM

Quote:

Originally Posted by cg

It was likely the VHF Intercity because after he played on that freq for a bit, he went to the DPH VHF channel and broadcast there for a few more minutes.

chris

VHF radios are also generally cheaper.

Jacob

elwood_blues · #12 (**permalink**) 01-07-2013, 12:14 PM

I wonder if this was the same guy who's been jamming freq's in the Danbury area (especially this morning). Sounds like a foreign accent, plus an odd signaling tone. He's all over the spectrum - Hi/Low and UHF.

millrad · #13 (**permalink**) 01-08-2013, 7:44 AM

I learned from credible sources that the interference was caused when an 11 meter operator brought a very high powered transmitter to a popular high-elevation antenna tower site in Northwest CT.
His transmissions were on AM in the CB band, and bleed into all of the UHF/VHF repeaters at the site.
I have heard the audio - the guy sounded like one of the babbling rapper-type operators found on CB Channel 6.
Apparently he got shut down when the cops showed up to figure out what was going on with the radios.
Yes kids, shielded and grounded equipment will rectify a very strong nearby signal.

APX7500X2 · #14 (**permalink**) 01-08-2013, 2:54 PM

Quote:

Originally Posted by millrad

I learned from credible sources that the interference was caused when an 11 meter operator brought a very high powered transmitter to a popular high-elevation antenna tower site in Northwest CT.
His transmissions were on AM in the CB band, and bleed into all of the UHF/VHF repeaters at the site.
I have heard the audio - the guy sounded like one of the babbling rapper-type operators found on CB Channel 6.
Apparently he got shut down when the cops showed up to figure out what was going on with the radios.
Yes kids, shielded and grounded equipment will rectify a very strong nearby signal.

Mohawk Mtn is very popular for DXing. He just chose the wrong way to do it

KB1ULP · #15 (**permalink**) 01-08-2013, 5:57 PM

Someone is now doing it on Hartford EDACS TG 04-041. Time 1856hrs. They are just making noises and saying hello and what not. But its locked the system up.

cg · #16 (**permalink**) 01-08-2013, 8:07 PM

That sounds more like a lost or stolen radio.

chris

elwood_blues · #17 (**permalink**) 01-09-2013, 8:32 AM

Quote:

Originally Posted by millrad

I learned from credible sources that the interference was caused when an 11 meter operator brought a very high powered transmitter to a popular high-elevation antenna tower site in Northwest CT.
His transmissions were on AM in the CB band, and bleed into all of the UHF/VHF repeaters at the site.
I have heard the audio - the guy sounded like one of the babbling rapper-type operators found on CB Channel 6.
Apparently he got shut down when the cops showed up to figure out what was going on with the radios.
Yes kids, shielded and grounded equipment will rectify a very strong nearby signal.

Is that strong enough to overried PL/DCS tones (as ws the case here)? I didn't think that was possible.

scanningisfun · #18 (**permalink**) 01-09-2013, 9:42 AM

Quote:

Originally Posted by elwood_blues

Is that strong enough to overried PL/DCS tones (as ws the case here)? I didn't think that was possible.

Exactly what I thougt. I was also FM, not AM. The tone was present.

Jacob

cg · #19 (**permalink**) 01-09-2013, 9:42 AM

If it was at Mohawk, that is a long way from the Intercity North repeater for it to bleed into the repeater.

chris

Quote:

Originally Posted by millrad

I learned from credible sources that the interference was caused when an 11 meter operator brought a very high powered transmitter to a popular high-elevation antenna tower site in Northwest CT.
His transmissions were on AM in the CB band, and bleed into all of the UHF/VHF repeaters at the site.
I have heard the audio - the guy sounded like one of the babbling rapper-type operators found on CB Channel 6.
Apparently he got shut down when the cops showed up to figure out what was going on with the radios.
Yes kids, shielded and grounded equipment will rectify a very strong nearby signal.

PJH · #20 (**permalink**) 01-09-2013, 12:19 PM

AM 27Mhz equipment generally should not, and technically shouldn't have any effect on normal above band FM equipment. At one of our missle sites we had everything from HF to EHF, AM/SSB/FM at monster power outputs within a concentrated area and no issues.

Now with that being said, if your pumping 1kw of RF 30ft away from a site, anything could happen - but shouldn't if everything is installed correct and site visits are done on a regular schedule. This is why 100watt lowband radios on a tower doesn't come across the UHF freq's in an antenna next to it (we had several setup this way). You might get some desense, but no crosstalk.

VHF radios are not less expensive than UHF, 800 or any combination. Its whatever the used market demands.

This is also why we do not give out programming software. Just too many risks for idiots to jump on radios they are not suppose to be playing with in the first place. Of course we can't control those ham radios that can be modified out of band.

Very hi power CB amplifier - YouTube