Low power 100mw FM Transmitter

Dell / Latitude d620...
September 10, 2014 at 13:32:20
Specs: Windows XP Pro, Intel Core2Duo
A few months ago I purchased this

http://www.ebay.com/itm/17086757429...

I haven't used it much just tested it out. I drove down the road and got the signal about a mile. I live in a rual area away from town and interference. I was just wondering if it is really legal? I can set it to any frequency. I think as long as I use common sense and don't ride over another station it's legal and would ebay allow it if it was illegal?

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#1
September 10, 2014 at 14:40:18
I doubt the common sense bit has anything to do with legalities, rather more to do with not getting caught (or causing a nuisance) if it is illegal. I doubt you can bank on eBay either - they probably don't vet everything.

Here in the UK it would definitely be illegal as it transmits on the commercial broadcast band. Assuming you are USA, the laws might be quite different and might vary from State to State. So while you are waiting for another input let us know what State you come from, just in case it matters.

Always pop back and let us know the outcome - thanks

message edited by Derek


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#2
September 10, 2014 at 15:05:17
I am in Georgia USA. I have heard of these low power transmitters being used for special events. I know of a Church that uses one at Christmas and they have a sign out saying tune your radio. Also one day I heard some broadcast real clear on 94.1 it faded out about a mile so I think someone else has one of these it was not a station because there is not a station on 94.1 for over 100 miles. I mainly bought it to see what it would do. I have only played some music I have not talked through a mic. I have always been interested in things like this.

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#3
September 10, 2014 at 15:21:32
According to Wikipedia, 100mv transmitters are the legal limit in the USA: http://en.wikipedia.org/wiki/Microb...

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#4
September 10, 2014 at 16:28:48
I know it's an aside but I once had a signal generator with valves (tubes) in it, which I used for radio and TV repairs. One day I shoved a bit of wire onto the RF output to act as an antenna then pumped music into the modulation sockets at a few watts using an amplifier. I then picked up the signal on a portable radio, tuned in to the FM radio band and quite deliberately played the most corny old 78 rpm record I could find. It wasn't until I'd found myself well able to listen to this after going out of my street and part way down the next, that I thought I'd better pack it in.

I later used the same rig to temporarily block out a neighbors noisy radio (just using the carrier wave).

Oh dear - must have had criminal instincts during my misspent youth.

Always pop back and let us know the outcome - thanks


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#5
September 10, 2014 at 17:21:22
I remember the CB day's two of my uncles had very powerful CB's. One had a Furniture store that delivered. He had a CB in ever truck and a Base at the store. One day my uncle told me he was visiting his brother (my uncle that had the store) he was around back of the store talking to the base telling him he was there. He told him to stay around back because a van was in the front with a radar thing spinning around I guess trying to find over powered CB's. I know this is off topic it's just interesting to me my uncle gave me his base before he died it had been modified had some bands above 11 meter and below. I never got it to work I guess he was just worn out maybe had to do with being modified. I wonder if the FCC still tracks like that. I think if I keep it at 100 MW I will be OK. The thing is anywhere around my house it drowns out the whole FM band and not so much the more you get away and I live off the road kinda in the woods so who would really report me?

Laptop Dell Latitude D620 Core2Duo
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Desktop HP Pavilion p6533w
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message edited by ChristopherTGarrett


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#6
September 10, 2014 at 17:29:03
Yeah, I reckon you'll be OK with that if you're a bit careful.

Always pop back and let us know the outcome - thanks


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#7
September 10, 2014 at 18:29:00
I wish I had some old albums. I know I can find music online. I could have a real station . Most stations are computer controlled these days I could get some music I guess. I went in a studio once but they had reel to reel setup.

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#8
September 11, 2014 at 03:39:03
Many domestic wireless mics had (have?) very low powered transmitters that operated in the domestic VHF (aka FM) band. TX range was/is very small and power o/p likely a max of 100mv. There were also allegedly AM version too but never actually used one. One simply tuned an FM radio receiver to a frequency that wasn't in use locally; then tweaked/tuned the wifi mic end to that frequency... Lo one had a (cordless) wireless mic, the o/p of which was available via the audio o/p on any FM radio... ; and which could be fed into a PA (and/or recorded to).

They were (still are) ideal for anyone requiring a wireless mic and not up to paying for more high end kit... Their limitations were apparent in that signal drop off/dead spots was an issue; as was polarity of signal radiated.

Blocking of a broadcast signal is of course "rather naughty" and can get one sent to bed with no hot choccy ' n cookies...; or even worse made to chop wood and fetch water... There are now freely available (in USA at least) mobile phone blockers - which whilst legal to own in the UK are not "exactly legal" to use there - without a special license... Some theaters etc. either have them installed (nder license) or are considering them, due the increasing number of nuisance mobile/cell phone ring-tione/"whispered" conversations that abound these days during performances. In the USA/CanadaI think they are "legal" for general/domestic use as well? The Israelis were likely first to market these gadgets...; and they can be found "out there (Skully)" on the www...

Some are tres petite/very small and local/limited range - ideal for those annoying loud moronic conversations that seem to abound on public transport... The sort of "I'm on the train; and how did the neutron bomb test go today - did you succeed in decimating another fruit fly colony?" and so on... Very tempted at times to get one and use as/when appropriate - as the limited range one is indeed rather small, and easy to conceal... All one has to do is to activate it at intervals all the pests will soon give up; thus restoring the peace and quiet to all ...


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#9
September 11, 2014 at 06:40:46
trvlr: In the USA/CanadaI think they are "legal" for general/domestic use as well?
If by "legal" you mean it's a felony offense to own or operate, then yes.
http://www.fcc.gov/encyclopedia/jam...
http://tbo.com/news/business/fcc-se...

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#10
September 11, 2014 at 06:59:51
ah... I was under the impression that one could use a phone blocker legally - as in not against the laws of the... Seems things have changed since first I researched them a few years back. At that time they were presented as "legal" - not infringing any Federal or other laws...

Thank you for the update to my understanding... Although how "they" would know you were operating one (intermittently) in a small enclosed environment (as in a train etc.)...?


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#11
September 11, 2014 at 07:13:25
I don't know, but the second link shows they managed it for someone in Florida. I assume that had more to do with the police equipment dying in proximity to the guy. With the current political climate in the 'States, I suspect any subway system would immediately be locked down "due to potential terrorist activity" as soon as someone's radio died.

But I'm jaded like that.

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