Transmission1

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.
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.

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

The more important point, however, was that the trams are active, on TETRA!

oh Tetra again

Gemini4 wrote:oh Tetra again

It's not a problem. The tetra is not encrypted.

oh good

Gemini4 wrote:oh good

If you look on my YouTube channel you will see a short clip...

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.

So what sort of frequency are we looking at?

440-441MHz. Look on the WTR

interesting link. I hadn't seen that before