Nottingham Trams

Scanning radio frequencies for the East Midlands
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radiosification
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Re: Nottingham Trams

Post by radiosification » 01 Jun 2015, 18:36

takara wrote:
radtech wrote:
Presumably power output was meant to be 10W not 100W as they've been licenced for! Also odd that they've been assigned 25khz channels.
And 13 dBi antenna gain. Don't know about Nottingham would think that signal could be heard in Devon.
The 13dBi gain is what causes the ERP to be so high. It's what causes a relatively low transmit power to be represented by a very high EPR. Because the gain is so high. {bnghd}
The actual power output from the radio will be much much less. 100W is the ERP coming out the antenna, factoring in gain of the antenna. It stands for effective radiated power in case you didn't know.
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Re: Nottingham Trams

Post by radtech » 01 Jun 2015, 22:49

True, should have been 10W ERP. They probably added 13 dbi to the ERP in error.
Rich

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kr0ne
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Re: Nottingham Trams

Post by kr0ne » 02 Jun 2015, 07:52


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Re: Nottingham Trams

Post by radiosification » 09 Jun 2015, 23:54

The more important point, however, was that the trams are active, on TETRA!
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Re: Nottingham Trams

Post by Gemini4 » 10 Jun 2015, 11:27

oh Tetra again :thumbdown:

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Re: Nottingham Trams

Post by radiosification » 10 Jun 2015, 11:32

Gemini4 wrote:oh Tetra again :thumbdown:
It's not a problem. The tetra is not encrypted.
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Re: Nottingham Trams

Post by Gemini4 » 10 Jun 2015, 11:41

oh good :thumbup:

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Re: Nottingham Trams

Post by radiosification » 10 Jun 2015, 11:42

Gemini4 wrote:oh good :thumbup:
If you look on my YouTube channel you will see a short clip...
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Re: Nottingham Trams

Post by neil57uk1 » 11 Jun 2015, 12:49

Impressive video. All we need now is for somebody to produce a hand held scanner/radio that will monitor tetra etc as using a computer/laptop is not very practical.

Assume none of the Chinese models are up to this yet.

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Re: Nottingham Trams

Post by Gemini4 » 12 Jun 2015, 19:03

So what sort of frequency are we looking at?

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Re: Nottingham Trams

Post by radiosification » 12 Jun 2015, 19:05

440-441MHz. Look on the WTR
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Re: Nottingham Trams

Post by radtech » 14 Jun 2015, 12:32

Rich

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Re: Nottingham Trams

Post by radiosification » 10 Jul 2015, 20:05

interesting link. I hadn't seen that before
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