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LPFM Broadcast Laws in New Zealand
 New Zealand Low Power FM Radio Broadcasting Forums : LPFM Broadcast Laws in New Zealand
Subject Topic: Broadcasting on 88.8 FM (?) Post ReplyPost New Topic
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AZBoy28
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Posted: 08 November 2012 at 11:50pm | IP Logged Quote AZBoy28

Hi,

I'm new to all this FM broadcasting stuff.

I'm keen on buying one of those FM Transmitter kits from Jaycar, to start my own mini radio station.

My question is can I broadcast on 88.8FM without a license. I don't think this transmitters have a large range anyway. I have done some research, but I'm confused.

Please help!

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RadioTech
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Posted: 09 November 2012 at 3:16pm | IP Logged Quote RadioTech

Welcome to the forum.

I see your comment about starting a 'mini radio station'. The thing here is to define 'mini'.
The Jaycar kits are designed for experimental use or if you just want to be able to hear your mp3 player at the other end of the house.

You should not use them for broadcasting to your local neighbourhood. Simply because they don't meet specification. They are a VCO design which means the frequency is not tightly controlled and can drift.

Any transmitter used for low power FM broadcasting must be of PLL design.

As far as 88.8 MHz goes, it does not fall within the GURL as a useable frequency.
87.6 - 88.3 are allowed in the lower end of the band and 106.7 - 107.7 at the top end of the band.

If the Jaycar unit has an output of less than 10 microwatts then you can use 88.8 MHz as it then falls under the classification of a 'short range device' similar to the cheap wireless microphones that transmit in the FM band from 87.5 - 108 MHz.

If this is the case, and the output is 10 uW or lower, you wouldn't want to try to use it to 'broadcast' with - as your range would be about 20 metres and you'd probably be drowned out by other high power transmissions on commercial frequencies anyway.

I hope this helps :)


Edited by RadioTech on 09 November 2012 at 3:19pm
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AZBoy28
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Posted: 10 November 2012 at 11:50pm | IP Logged Quote AZBoy28

Thanks for your useful reply, I really appreciate it

Here's the kit- http://jaycar.co.nz/productView.asp?ID=kj8750&keywords=f m+transmitter&form=KEYWORD .My radio station is for experimental purposes only, I'm probably only going to spend 1 hour a day on air, at the most.

Can you please give my some feedback on this & what frequencies I can broadcast on with this?



Edited by AZBoy28 on 10 November 2012 at 11:51pm


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Posted: 12 November 2012 at 3:26pm | IP Logged Quote RadioTech

It would come under the category of SRD or 'Short range device' under the MED regulations, which means you can use any frequency from 87.5 - 108 MHz.

The short antenna means it won't transmit too far. The claimed range of up to 1 km is *possible* but unlikely in a real-world environment, given the amount of interference you'd be subjected to by other higher powered transmissions.

The design is a VFO (colpitts oscillator) meaning the frequency will drift somewhat - even moving your hand near the circuit board will cause some change in frequency. It's Ok for experimental purposes, or use as a wireless mic - but as for broadcasting I don't think you'll be too impressed with it.


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AZBoy28
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Posted: 13 November 2012 at 2:15am | IP Logged Quote AZBoy28

Okay, Thank you so much for your help :)

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