ofcom?

thetufparker · Post by **thetufparker** » Thu Nov 27, 2014 2:30 pm

hi -
got a land rover outside my house.. with a massive telescopic aerial - think its ofcom - radio propagation investigation?? - just wanted to let Brighton Pirates know.. in case - they come for c.s
i got a pic.. ill post it..

thetufparker · Post by **thetufparker** » Thu Nov 27, 2014 2:36 pm

pretty much this - but with different aerials on the mast .. - http://stakeholders.ofcom.org.uk/market ... on/above3/ looks like they got 2 aerials atop and some other units look like gunns/horns..

thetufparker · Post by **thetufparker** » Thu Nov 27, 2014 2:50 pm

teckniqs · Post by **teckniqs** » Thu Nov 27, 2014 6:42 pm

That, my friend, is a mobile UHF mid-point link for Juice FM 107.2, I know the person who drives it.

...Panic over!

(Log periodic RX antenna on the left and TX antenna on the right)

thestig · Post by **thestig** » Thu Nov 27, 2014 9:49 pm

teckniqs wrote:That, my friend, is a mobile UHF mid-point link for Juice FM 107.2, I know the person who drives it.

...Panic over!

(Log periodic RX antenna on the left and TX antenna on the right)

Do you know the mid-point frequency per chance?

thestig · Post by **thestig** » Thu Nov 27, 2014 9:52 pm

The last time I saw definite ofcom there was 2 guys in an Astra van. No antennas on top but some DF stuff inside and one guy had a handheld spectrum analyser. (they did not find the source of transmission)

teckniqs · Post by **teckniqs** » Thu Nov 27, 2014 10:42 pm

I haven't got a clue but I'd guess around about 470MHz, shouldn't be too hard to find on a scanner though if you're close enough by.

thewisepranker · Post by **thewisepranker** » Thu Nov 27, 2014 11:29 pm

That antenna looks like a 400 MHz to 4 GHz log periodic, after looking at it a few times. The coax is way too thick for anything above about 1.2 GHz so about 470 MHz is probably correct.

MiXiN · Post by **MiXiN** » Fri Nov 28, 2014 12:52 am

A cheap scanner with 'close call' would latch on to the Tx frequency in a second, so if anyone with a Uniden scanner sees it around please turn close call on and post the frequency.

One of those chinese frequency sniffers with a stubby stock antenna would also find it as soon as the keyed.

pjeva · Post by **pjeva** » Fri Nov 28, 2014 9:00 am

thewisepranker wrote:That antenna looks like a 400 MHz to 4 GHz log periodic, after looking at it a few times. The coax is way too thick for anything above about 1.2 GHz so about 470 MHz is probably correct.

LMR400 is very thick and works very well at even 5GHz. Also it could be 1/2 inch semi-rigid...

thewisepranker · Post by **thewisepranker** » Fri Nov 28, 2014 3:41 pm

You wouldn't use semi-rigid on an extendable mast.
The problem with thick coax at high frequency tends to be the connector you put on the end.

thetufparker · Post by **thetufparker** » Fri Nov 28, 2014 9:08 pm

mate spoke to geezer today - testing freeview reception today -says he can check many things - radio included - just changes the antenna - works freelance.. mate said he was a very nice dude.. mystery over.. sorted

teckniqs · Post by **teckniqs** » Fri Nov 28, 2014 11:31 pm

Yeah spoke to the dude I mentioned earlier and he said it wasn't him although his Land Rover with electric extendible mast is very similar.

sproggy · Post by **sproggy** » Sun Nov 30, 2014 2:51 am

thewisepranker wrote:semi-rigid on an extendable mast.

Stop it.

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