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311 posts

Ultimate Geek
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Topic # 146622 23-May-2014 20:58
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Hey guys.

 

I bought one of these 7w FM transmitters on Ebay yesterday.

 

Here's a link. http://www.ebay.com/itm/CZE-7C-7W-FM-Transmitter-Stereo-PLL-Broadcast-Radio-Station-Antenna-76-108MHz-/161089004690?pt=US_Ham_Radio_Transmitters&hash=item2581a72492

 

 

 

I want to know, are they legal in NZ? I know they are 7w, and the maximum legal power for unlicensed people is 1w, and thankfully they say the unit can be switched, to transmit at 1w only, even if I did transmit at maximum power, the signal won't go far, as it's a small antenna, and we live in a dip in the road, surrounded by trees.

 

 

 

Just out of interest, how power is 7w anyway, and how does it usually go, under best conditions, line of sight etc?

 

Are these devices legal to import into NZ, I looked on Customs, and related websites before I bought it, and the closest thing to being banned, are "Radio Jammers", and this is a transmitter.

 

 

 

Since customs said nothing about it being banned, I went ahead and bought it, but I just thought I'd check, in case, when it arrives, I start broadcasting, and then I get a knock on my door from the police.

 

Thanks

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  Reply # 1051939 23-May-2014 21:12
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You have already answered your own questions.

Having a device that can transmit at greater than 1W isn't illegal. Transmitting at greater than 1W e.i.r.p is. That device looks like it can only be switched between 7W and 1.5W, so it's potentially illegal to operate in NZ.

It won't be the Police knocking at your door, they couldn't care less. It'll be RSM who will visit and impound gear on the spot that breaches the radio regs and will issue fines. Ignorance of the law (which you clearly don't have anyway) isn't a defence.






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Ultimate Geek
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  Reply # 1051974 23-May-2014 22:16
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Thanks for the reply Steve.

Yes, if it is 1.5w, then it should be illegal, but thankfully I don't, nor intend on getting a powerful antenna, so it shouldn't go very far.

 

One of the reasons why I bought this type of transmitter, was because they could do 1w, so I won't be breaking the law.

 

Although the listing states 1.5w, other Ebay listings for identical models, and youtube videos I've watched, state that it's actually 1w.
Thanks to the ignorance of the Chinese people who list the listings on Ebay, I'm not sure what to believe.

 
 
 
 




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Ultimate Geek
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  Reply # 1051976 23-May-2014 22:19
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and my earlier post wasn't really about it being the right specifications, for being within the law, it was kinda, was, but like you said, I already pretty much know, but it was mainly because NZ may ban unbranded chinese transmitters, that aren't certified, and have the potential to cause interference with other broadcasts.

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  Reply # 1051992 23-May-2014 22:42
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I had to get the transmitter I built tested and then a certificate of compliance issued, the main issue is that lot of these devices have inadequate filtering and send of frequencies all over the band - you can bet if you interfere with any licenced service you can bet on a knock at the door (not the police but a MED inspector)

Remember to broadcast your contact details as per the requirements.

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  Reply # 1051998 23-May-2014 23:19
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You could put a bandpass filter tuned to your required output freq, this will reduce spurious outputs as well as dropping a bit off your transmit power.


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  Reply # 1052052 24-May-2014 08:52
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Those transmitters are of the cheap Chinese 'HLLY' type, going by appearances. I think you will find RSM knocking on your door pretty quick. There is more involved in being 'legal' other than just transmitter power being 1 Watt per below.




Check out my LPFM Radio Station at www.thecheese.co.nz cool

 

 

 

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  Reply # 1052055 24-May-2014 09:19
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I think you'll find it's not illegal to own it, only to use it. Customs won't be interested but RSM certainly will.
What you probably don't know is that given the right atmospheric conditions it has the possibility of being heard as far away as Australia or even further.
Under normal conditions I would expect a range of several Km or even more.
And being of Chinese origin and cheap it is likely to cause many problems in the FM and other bands due to lack of filtering etc. Even at 1w you could be in deep doo-doo.

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  Reply # 1052184 24-May-2014 12:55
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I have a similar 5w one. It's not 5 watts. More like 2. But the output is awful. Stereo barely works once you get the audio levels up to anywhere near enough and back in the days of analog tv it would screw up a couple of channels and even be able to have the audio tuned to on the old garage tv with twisty knob tuning. Hate to think what else it out out.

Also there was that article about some kid who had a similar looking transmitter seized not too long ago. Will try to find it later.




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  Reply # 1052195 24-May-2014 13:18
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B1GGLZ: I think you'll find it's not illegal to own it, only to use it. Customs won't be interested but RSM certainly will.
What you probably don't know is that given the right atmospheric conditions it has the possibility of being heard as far away as Australia or even further.
Under normal conditions I would expect a range of several Km or even more.
And being of Chinese origin and cheap it is likely to cause many problems in the FM and other bands due to lack of filtering etc. Even at 1w you could be in deep doo-doo.

I think you're exaggerating.  It's in VHF band and therefore inherently Line of Sight, although even with 5W that could be several km.  The only time I've heard of FM transmissions going further than LOS is with extreme surface ducting like you occasionally get in the Gulf (Arabian, not Hauraki).  Even then you're generally looking at a few hundred km maximum, not the nearly 2000 to get to Australia.
I have to agree though, running one of these in public broadcast frequencies in NZ is a bad idea

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  Reply # 1052210 24-May-2014 13:26
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richms: I have a similar 5w one. It's not 5 watts. More like 2. But the output is awful. Stereo barely works once you get the audio levels up to anywhere near enough and back in the days of analog tv it would screw up a couple of channels and even be able to have the audio tuned to on the old garage tv with twisty knob tuning. Hate to think what else it out out.

Also there was that article about some kid who had a similar looking transmitter seized not too long ago. Will try to find it later.


Article can be read here.. Might be one you are referring to?

https://www.pledgeme.co.nz/projects/2045
Note the transmitter in this article looks the same as the OP has purchased, just going by the case.




Check out my LPFM Radio Station at www.thecheese.co.nz cool

 

 

 

Use this link to sign up to Bigpipe broadband and you'll get $20 off your first bill: Referral Link


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  Reply # 1052227 24-May-2014 13:44
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shk292:
I think you're exaggerating.  It's in VHF band and therefore inherently Line of Sight, although even with 5W that could be several km.  The only time I've heard of FM transmissions going further than LOS is with extreme surface ducting like you occasionally get in the Gulf (Arabian, not Hauraki).  Even then you're generally looking at a few hundred km maximum, not the nearly 2000 to get to Australia.
I have to agree though, running one of these in public broadcast frequencies in NZ is a bad idea

Not correct. Being an active Radio Amateur I regularly work Australia, Japan and Pacific Islands on 50mhz during Summer. Australian FM radio stations are often heard in NZ during Summer. Trans Pacific propogation occurs occasionaly on 144mhz, 432mhz and even 1296mhz at times during Summer. 10w power is quite sufficient power when the bands are open and even 100mw can produce satisfying results.



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Ultimate Geek
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  Reply # 1052231 24-May-2014 13:49
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ZollyMonsta:
richms: I have a similar 5w one. It's not 5 watts. More like 2. But the output is awful. Stereo barely works once you get the audio levels up to anywhere near enough and back in the days of analog tv it would screw up a couple of channels and even be able to have the audio tuned to on the old garage tv with twisty knob tuning. Hate to think what else it out out.

Also there was that article about some kid who had a similar looking transmitter seized not too long ago. Will try to find it later.


Article can be read here.. Might be one you are referring to?

https://www.pledgeme.co.nz/projects/2045
Note the transmitter in this article looks the same as the OP has purchased, just going by the case.

 

 

 

Yes, that transmitter looks similar, however what's the bet that he's using an external FM antenna.

 

I wouldn't dare do that, and as long as the factory supplied antenna doesn't break, I intend to keep using that, so hopefully it won't go as far.

 

Also running your transmitter non stop for 8 months non stop, is asking for trouble. I don't intend on running it full time, just for a few hours per day maximum. Maybe the odd overnight broadcast, on an assigned LPfm frequency once in a blue moon, but I don't intend on running it non stop. I'm suprised it took 8 months, not a lot sooner.

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  Reply # 1052550 24-May-2014 22:02
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ZollyMonsta:

Article can be read here.. Might be one you are referring to?

https://www.pledgeme.co.nz/projects/2045
Note the transmitter in this article looks the same as the OP has purchased, just going by the case.


Yeah that's the one. The fact that he had 100 in his name and was reported as being on a non legal channel makes me wonder how the hell it was 8 months till it was pulled..




Richard rich.ms



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Ultimate Geek
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  Reply # 1053049 25-May-2014 19:50
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Wouldn't do this, but just for interest sake what would happen if somebody had to broadcast at the full power somewhere off the NZ mainland, ie Motutapu island, Great Barrier island etc? I doubt the RSM inspectors will have the equipment, ie boats to actually go to the destination, and seize the equipment, sure they could probably do it easily, but unless one's actually being a menace, and deliberately interfering with legitimate communications, they should leave you alone for longer.

 

On a side note, changing the subject here I know, somebody actually brought it up with me in the day, is why haven't people transmitted the usual 87.5FM - 108mhz band from space? providing the technology was properly researched, and proper measures were put in place. Losing signal, through bush and rough terrain will be a thing of the past. I know, of XM in the USA, but I'm talking analog, not digital.

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  Reply # 1053056 25-May-2014 19:57
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PaulZA: Wouldn't do this, but just for interest sake what would happen if somebody had to broadcast at the full power somewhere off the NZ mainland, ie Motutapu island, Great Barrier island etc? I doubt the RSM inspectors will have the equipment, ie boats to actually go to the destination, and seize the equipment, sure they could probably do it easily, but unless one's actually being a menace, and deliberately interfering with legitimate communications, they should leave you alone for longer. On a side note, changing the subject here I know, somebody actually brought it up with me in the day, is why haven't people transmitted the usual 87.5FM - 108mhz band from space? providing the technology was properly researched, and proper measures were put in place. Losing signal, through bush and rough terrain will be a thing of the past. I know, of XM in the USA, but I'm talking analog, not digital.


Simple answer to question 1? Yes RSM will come and get you. You're breaking the law which they're there to enforce. From your posts I'm beginning to think that you're not taking the RSM seriously. That's a very bad approach to be taking. If you do things illegally they will track you down, and they will fine you.

Simply answer to question 2? I'm not quite sure how to answer that in a PC way, safest is to simply say that quite frankly it won't work.





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