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elctrnx_lyf
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Re: ISM band
elctrnx_lyf   7/31/2014 5:24:13 AM
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This idea seems to be completely realistic and the unlicensed bands would be a great boon for applications like thesein the future. Sadly it is still only avialable for US.

Kinnar
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Re: ISM band
Kinnar   7/29/2014 10:26:24 AM
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Nice finding there are very few companies who are having good transceivers in the in this range, Semtech, Linx Technologies are a few in the list, but may be they would have developed their own SDR as well.

nsornin
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Re: ISM band
nsornin   7/29/2014 8:09:28 AM
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After a bit of searching, my best guess is: http://www.semtech.com/wireless-rf/rf-transceivers/sx1272/

I can't see any other IC that would implement what they are describing.

 

Kinnar
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Re: ISM band
Kinnar   7/29/2014 7:20:07 AM
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Just got more information about the Kickstarter Project, they mention "We currently use a spread spectrum radio technology on the physical layer. By using spread spectrum we minimize the interference that we cause to other unlicensed devices running on the 902-928MHz band. Additionally we are not as sensitive to narrowband interference that are caused by other devices such as garage door openers and toys that are also running on the band." 

So you are right that it is not 102 to 128 Mhz band, and it is technically not possible to have this band for this kind of use. 

But this is a very nice development, today is someone want to use similar kind of service one will have to pay minimum 13$ Monthly Fees, where as Kickstarter project is not claiming any kind of monthly charge. This will be really an affordable solution for parents and companies.

If this really works out things will never go missing! 

Kevin Neilson
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Re: ISM band
Kevin Neilson   7/28/2014 10:16:24 PM
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I found a comment somewhere saying it was spread spectrum.  I think it would have to be to get the coding gain required to have a range of miles, like they claim.

ARasmussen
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Re: ISM band
ARasmussen   7/28/2014 12:56:39 PM
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As you said, given the device's size the 902 to 928 MHz is a likely place to put out their signal.  

Check out the USA frequency allocation chart at http://www.ntia.doc.gov/files/ntia/publications/2003-allochrt.pdf to see that the 902 to 928 MHz segment is allocated to "RADIOLOCATION" as a primary use and "Amateur" as a secondary use (as of its printing in 2003).

It would be nice if the manufacturer or author clairify the frequency of their long range radio.  It is an interesting device and KickStarter project.

 

 

mhrackin
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Re: ISM band
mhrackin   7/28/2014 12:48:27 PM
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Also, assuming this is REALLY using the 902-928 ISM band, there are a HUGE number of other consumer and industial devices using that band.  To name a few: cordless telephones. alarm systems, remote controls, and most microwave ovens!  I had a major conflict with my old "over-the-range"  microwave oven (recently deceased after 15 years or so) messing up the "900 MHZ" cordless phone in the kitchen a few feet away.  Too early to tell how badly the replacement leaks!  In any case, the FCC rule for ANY device using shared unlicensed frequencies is you have to accept any interference.

MWagner_MA
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Re: ISM band
MWagner_MA   7/28/2014 12:30:43 PM
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my thoughts exactly.  As a Ham operator using 2M transceivers the smallest antenna I have (that works) is still  4-5 inches in length.  The freq must be much higher.

arclight_arclight
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Re: ISM band
arclight_arclight   7/28/2014 11:32:54 AM
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There is no allocation for ISM in the 102-128 MHz band.  This has to be a misprint.

nsornin
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ISM band
nsornin   7/28/2014 10:58:11 AM
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I had no idea that there was an ISM band from 102 to 128MHz in the US . And the design of the antenna for the 100Mhz band in such a little object is probably a nice challenge :-).

Most probably a typo , the author probably refered to the 902 to 928Mhz band .

Any idea what this long range radio technology is ?



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