fm transmission

[Badger]

does anyone on here know if there are any fm transmission frequencies that we can can and cannot use in the midlands, for transmitting a music file through a fm transmitter via antenna (indoor) short range) is there any restrictions that i should know about. thanks, basically i am going to setup a fm transmitter to save having speakers outside then a notice will be lit up stating the transmitted freq that people in their cars, or on their fm mobiles can connect to/tune to to hear the music and see the lights flashing/programmed, any help much appreciated, :worship

 

[steptoe]

Im fairly sure if its for public consumption then you require a licence, and are limited to power output by DTI.

if its for 'private' use and other peeps just happen to tune in then AFAIAA its ok if below a certain power, mW stuff IIRC,

though Im going back quite a ways to when I done some stuff for a mate that used to have a jolly roger flying,

 

[Badger]

its for private use

 

[Riggerman]

Those were the days Steptoe..My take is 'it's only illegal if you get caught'..but you could start here Badger

http://stakeholders.ofcom.org.uk/enforcement/spectrum-enforcement/law...It's not gonna be 70's crap is it?

 

[kme]

I`ll dig out my frequencies book.....it`s a bit out of date, but most of the band designations won`t change much.

You`d be better Tx`ing on LW - less power needed. Much less.

 

[Badger]

no ray im only using a piece of music for the light show so i dont have to have speakers playing for a couple of hours, im sequencing a music file to micheal jackson thriller.

 

[M107]

Some reading for you Badge.

UK Radio Frequency Bands

RA365 - United Kingdom Table of Radio Frequency Allocations 9kHz - 105GHz

 

[Theorysparky]

Badger

was this you ???

https://www.youtube.com/embed/U_L6BsoZ1Y4?feature=oembedloads more on there

 

[Badger]

no theory it wasnt me but this one is

https://www.youtube.com/embed/mbEoauUIjTg?feature=oembed

 

[Theorysparky]

nice !!!

 

[newtonph]

Pretty interesting topic, thanks for the resource Badger.

 

[Evans Electric]

It can be done Badge, the Cosford Air Show broadcasts the commentary on medium wave to all the cars in the car park.

But I'd bet it needs a special licence , don't know who you apply to . Also you need to pay a fee to the PRS ( Performing Rights Society) who collect the broadcast fees for the artists. If you're broadcasting some Jackson stuff the Jacko family will be collecting a fee.

 

[kme]

Though Deke is, as always, correct - there is a loophole; which was the reason I made the point about LW earlier.

LW has much better propagation for a given transmitter wattage.

For example:

20 years ago, a "new" `local` radio staion was started - some of you might have listened to "Atlantic 252"?

The thing was...they were refused a broadcast licence in the UK; but were granted one in southern Ireland. Thing was; the allowance that was granted for transmission power would have given them a MW range of 25-30 miles. With LW, the same power carried them to most of the west side of England and Wales........ They`d already been granted the transmission licence, so by a slight "accident" of calculation, they "overspilled" their target area ( :slap ) by a few hundred miles.

If your 5-10mW was LW, you`d get an overspill effect - and the LW band is relatively quiet these days..........

(used to have a Philips RF signal generator, [PM5324 iirc], which could produce this effect. I could actually over-ride an FM frequency, for a radius of approx 10metres.

Handy when workmen in the house wanted radio 1, but it only played oldies ]

 

[steptoe]

Though Deke is, as always, correct - there is a loophole; which was the reason I made the point about LW earlier.LW has much better propagation for a given transmitter wattage.

For example:

20 years ago, a "new" `local` radio staion was started - some of you might have listened to "Atlantic 252"?

The thing was...they were refused a broadcast licence in the UK; but were granted one in southern Ireland. Thing was; the allowance that was granted for transmission power would have given them a MW range of 25-30 miles. With LW, the same power carried them to most of the west side of England and Wales........ They`d already been granted the transmission licence, so by a slight "accident" of calculation, they "overspilled" their target area ( :slap ) by a few hundred miles.

If your 5-10mW was LW, you`d get an overspill effect - and the LW band is relatively quiet these days..........

(used to have a Philips RF signal generator, [PM5324 iirc], which could produce this effect. I could actually over-ride an FM frequency, for a radius of approx 10metres.

Handy when workmen in the house wanted radio 1, but it only played oldies ]

WOW,

I worked on that a bit, even before they got a licence,

did you know loadsa irish, north and south, pirate then proper radio stations, started off on CB sidebands.?

never ever woulda thought you would ever have known about 252 or anything.!!!!!!

 

[kme]

I was sound engineering ( never pro; though I`d have liked to) ; radio & TV servicing mate.

Plus, 5 years doing comms for HM RN

I was among the last group of comms (RN radio comms personnel are "sparks" ) to be trained to read & send CW - it isn`t taught anymore; its all inmarsat !!!headbangheadbang

I can could send 35WPM, and could read it at 20 on a good day. Probably a damn sight less now....this is 20 yrs ago.

edit: remember when USB meant "upper sideband"? and had a corresponding LSB?

 

[steptoe]

oh yes, CW was why I never went HAM,

USB , LSB and KC shifts were all the rage,

them were the days, now where did I leave my rosey glasses,.?!

 

[kme]

.... . .-. -.-. ..- .-.. . ...

( but he probably stood on `em) :slap

Seriously. For short, urgent messages I don`t believe there is anything faster. By the time you`ve formatted the message, crypto`d it, and fed the relevant piece of punched paper tape into the transmitter, you could have sent & had reply.

As said, that made way for satcom - which was being introduced across the fleet when I got out. Thank god, cos it was carp.

The only advantage - the junior body on watch didn`t have so much shredding to do......

 

[steptoe]

I think I left them at the bottom of a bottle, I come across them every so often,

not hercs fault (I hope I got enough letters?!)

 

[kme]

]

 

[Sidewinder]

I remember USB & LSB as you are referring here & Atlantic 252!!!

Small world eh!