452.9000 136.5 Birmingham Prison

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452.9000 136.5 Birmingham Prison

Postby ScanLeicester » Mon May 26, 2014 11:21 pm

Just heard this come into life, must be a small lift on. According to the proma data base list on here last confirmed 08
"452.9 466.8 136.5 HMP Birmingham, Birmingham West Midlands FM Aug-08"
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Re: 452.9000 136.5 Birmingham Prison

Postby iScottybotty » Mon Aug 11, 2014 12:09 am

What does the 136.5 mean? Is that a frequency also?

I can confirm that 452.900 is still active (10/08/2014) as the main channel (JG), apart from that I don't have anymore info.

If anyone has the frequency for HMP Oakwood or Hewell or any shop watch schemes in Edgbaston or Snethwick i'd be grateful.
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Re: 452.9000 136.5 Birmingham Prison

Postby Alfie » Tue Aug 12, 2014 2:15 pm

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Re: 452.9000 136.5 Birmingham Prison

Postby iScottybotty » Mon May 16, 2016 11:58 pm

How did you find out the CTCSS code for HMP Birmingham?

Also, what does this do? Is this just not for transmit? Will I actually hear any comms from 136.500?

Thanks!
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Re: 452.9000 136.5 Birmingham Prison

Postby thelad » Tue May 17, 2016 6:48 am

You dont need the tone to just RX. Dont think the tone will be any good now as i expect they are using DMR/Tetra now.
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Re: 452.9000 136.5 Birmingham Prison

Postby Chris P » Tue May 17, 2016 7:28 am

Its 136.5hz which is superimposed onto the carrier frequency( not Khz or Mhz ) the ctcss system is used to only open the squelch on those receivers that have the appropriate tone squelch turned on if you have ctcss turned off you will hear all transmisssions on the carrier frequency ( 452.9Mhz in this instance ) but if you set the ctcss to 94.8 hz for example you wont hear the audio from a transmission with 136.5 ctcss.as your receiver squelch wont open.

The system allows several receivers to listen to the same "channel" but only "hear" those that they are intended or required to. This permits those in control of the set up of the radios to pre determine who hears what to a certain extent . The control can hear all transmission on any one particular channel by turning their RX CTCSS tone off and by selecting a specific CTCSS tone on their transmitter control who hears their audio .

136.5 Mhz is RAF Lakenheath approach so if you tune in to that frequency in Birmingham you may hear aircraft in the lakenheath area ( doubt if you hear the ATC ground controller unless theres a lift on ) but nothing to do with the prison

136.5 KHz is in a shared band . the primary allocation in this area is for maritime use and is used for naval submarine communications so any signals you might hear will be un-decipherable and ( on a secondary basis ) the radio amateur LF band so you probably wont hear anything
Regards Chris aka G8FFF nipper or tazmin88
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Re: 452.9000 136.5 Birmingham Prison

Postby iScottybotty » Tue May 17, 2016 11:56 am

Thank you for the above, I think I understand.

So to use the original freq on a scanner would be OK, any transmission by the controller would be heard, one way. I believe the handheld units are 12.5mhz up when talk through isn't activated so I'd need to be pretty close to the establishment to hear both sides.

The tone however I now understand to be only required on the handheld unit.

So, the controller is on 452.900 for example. If I had a radio handheld capable of transmitting, I'd then need to type in this frequency again and in the menu choose 136.5hz to open the squelch? That would then open the floodgates so to speak?

Or would I need to programme, 452.900 as the receive, 465.400 to transmit and in a menu somewhere 136.5hz to open the squelch?

Just trying to make sensed it all.

Any further advice would be appreciated. Thank you.
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Re: 452.9000 136.5 Birmingham Prison

Postby moj » Tue May 17, 2016 12:15 pm

Your not allowed to transmit on a frequency especially a prison frequency so its crazy asking a question like that on here , trust me stick to the scanning side of things and stay that way ;)
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Re: 452.9000 136.5 Birmingham Prison

Postby Chris P » Tue May 17, 2016 4:54 pm

I think iScottybotty is trying to understand how CTCSS works on semiduplex systems rather than wanting to transmit , which as you say would be extremely unadvisable .especially on a home office system frequency .

for scanning purposes it is a good idea to set the CTCSS tone to none or off on you receiver , that way you don't miss any transmissions . the tone is irrelevant for reception purposes so I cant understand why people need to know it on analogue systems if they only intend to receive .

If you are on a Digital system the colour code is required in order to decode which is a totally different kettle of fish though
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Re: 452.9000 136.5 Birmingham Prison

Postby m0lsx » Tue May 17, 2016 5:34 pm

iScottybotty wrote: So, the controller is on 452.900 for example. If I had a radio handheld capable of transmitting, I'd then need to type in this frequency again and in the menu choose 136.5hz to open the squelch? That would then open the floodgates so to speak?

Or would I need to programme, 452.900 as the receive, 465.400 to transmit and in a menu somewhere 136.5hz to open the squelch?.



No, no tone is needed at all to hear either side.
My wife works at a location where they use a system available to anyone who applies to Ofcom & pays a few pounds for a 5 year licence. Sitting outside her place of work I can hear several other users on the same frequency. Each is using CTCSS.
CTCSS stops my wifes locations radios from opening the squelch when any other user transmits on the frequency they all share.
So I can hear my wifes location, plus all the other users with my CTCSS off. And unless I transmit on that frequency with the appropriate CTCSS tone for any individual user they will not hear me.
So my wife location for example has two departments within the same building using frequencies which are close to each other & others using exactly the same frequency further away & due to CTCSS, those who do not understand radio wonder why they get occasions when the radio signal is unreliable despite being within a small building. If they had a channel programmed with no CTCSS programmed, they would realise, the radio users the other side of the building interferes with them, as do other users on the same frequency.
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