458.8000 Nottingham Midlands ??

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458.8000 Nottingham Midlands ??

Postby bigpimp347 » Tue Jan 29, 2019 11:22 am

a mates been hearing it a while now on and off say it's someone just keying the mic up and not talking,
i heard it yesterday, traffic in the background, voices, not near me as such but everywhere i drove no good signal either,
but voices, traffic sounds in the background..

now 458.800 is UK general right ??
so 5w handy.

ok so today it comes on again 8.50am full signal.
no audio.
i'm thinking Hive, or digital electricity senders,
so i went out mobile (had to go out) on my own estate heard it with no antenna, no CTCSS no DCS hits either.
but i was hearing it over a couple of miles two on a handy..

only thing i noticed was in the air was the local radio traffic watch thing that does updates to the radio stations.

nothing on WTR Browser (i have the software)
it's a UK General channel so i assume could be anyone,
but the coverage was massive, strong and clear,
i'll listen again later nearer the going home traffic times and see if it is the new media helicopter thing..

other than that i don't have a clue..
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Re: 458.8000 Nottingham Midlands ??

Postby bigpimp347 » Tue Jan 29, 2019 11:25 am

just using the SDR found some more on 458.500... voices and similar noises..!!!
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Re: 458.8000 Nottingham Midlands ??

Postby bigpimp347 » Tue Jan 29, 2019 11:27 am

Also a carrier on 458.700 with a lot of crackles ???
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Re: 458.8000 Nottingham Midlands ??

Postby bigpimp347 » Tue Jan 29, 2019 11:29 am

and now 458.800 fired back up, banging and clunking noises,
and signal is a dirty as hell... 60+ on SDR and splattering like crap..
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Re: 458.8000 Nottingham Midlands ??

Postby bigpimp347 » Tue Jan 29, 2019 1:34 pm

OK 458.700 is still there no voices, just crackles like a bad connection.

500 and 800 have been on and off, voices, road noise all sorts of stuff..
the signal was end stop, Baofeng no antenna signal.
i was thinking helicopter new media road watch, but two of them ?
and nothing regarding take off or landing,
so now i'm thinking police mobile camera van ??
or something which has audio like a camera mic combo being moved from location to location..
at the moment there is nothing on 500 or 800,
one of them had a very common local sounding old guy chatting bollocks about his daughter lived around here and the clay in the ground and such, a younger the sounding guy to operative was on about looking around the power station,
i was thinking again helicopter ??

any way it's wrecking my head but they've gone now so i'll wait till later and get the DFing gear out and hopefully find what they are..
i might even try to find this 700 one first seeing as it's just on..
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Re: 458.8000 Nottingham Midlands ??

Postby Neil57uk » Wed Jan 30, 2019 6:51 pm

If you are using a dongle the correct freq could be anything. Dongles often do not ident the freq correctly which is evidenced by the numerous dodgy logs that now appear.
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Re: 458.8000 Nottingham Midlands ??

Postby Mark5R » Wed Jan 30, 2019 8:53 pm

bigpimp347 wrote:now 458.800 is UK general right ??
so 5w handy.

Yes 458.800 is a simple UK frequency which used to be called UK general. Its one of the newer frequencies added in May 2017

bigpimp347 wrote:so i went out mobile (had to go out) on my own estate heard it with no antenna, no CTCSS no DCS hits either.
but i was hearing it over a couple of miles two on a handy.

This sounds like a birdie (internally generated signal in scanners)? The only times I have noticed a scanner have a full signal on a frequency with no antenna and at various locations is when it has been a birdie. Check the manual for your handy scanner and it may even list it as a birdie frequency.

bigpimp347 wrote:just using the SDR found some more on 458.500... voices and similar noises..!!!

I agree with Neil57uk. SDR shows a lot of false positives, mirrors and other interference.
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Re: 458.8000 Nottingham Midlands ??

Postby bigpimp347 » Wed Feb 06, 2019 1:26 pm

ok first these are genuine used frequencies, have you tried listening for them ??
i've been around scanners and receivers for years i remember listening to the old bill on 131mhz due to the way the scanner mixers worked.

ok here's what it is,.
it is two different frequencies,
458.700 is not related and seems to be a data thing in constant use 24/7
458.500 and 800 off all week until yesterday when they both returned, a lot weaker though..
so i'm guessing these are related to each other ?
although yesterday 800 was stronger than 500 but both had the same road sounds and back ground noise's (i don't mean at the same times, similar back ground noises)

today 500 is a lot stronger than 800 and at this time they have both switched off again..
they come on and go off at different times too so not a harmonic being created from one frequency in to another as their patterns are different and backgrounds are different.

i'm thinking, police camera vans ??
some sort of civil engineers with an on board repeater like the police's old 147mhz system ?

apart from the data burst's on the frequencies i hear nothing else around that band,
and by the way 800 is back on now, 500 still nothing..

i'm stumped...
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Re: 458.8000 Nottingham Midlands ??

Postby bigpimp347 » Wed Feb 06, 2019 1:28 pm

As for my equipment.
most listening is using a Kenwood TM-G707.
using HDSDR for the spectrum display and band scan.
also monitoring on a realistic 2006.

and while mobile a Kenwood TM-V71 and a Sadelta V/UHF TV antenna tuner (receives FM audio and has very good attenuation)
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Re: 458.8000 Nottingham Midlands ??

Postby Steve » Wed Feb 06, 2019 2:59 pm

458.500 MHz - 458.950 MHz is allocated to Licence Exempt, Industrial/Commercial Telemetry and Tele-command and also Model Control.

So data type noise on 458.500 and 458.700 is exactly what to expect there.

458.800 is as mentioned, New Simple UKG so it could be anyone due to the thousands of UKG users both authorised and unauthorised out there.
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