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Author Topic: 900 Mhz Spread Spectrum "FRS Like" Radio  (Read 3740 times)
KB1OCC
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Posts: 172




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« on: September 11, 2007, 11:55:00 AM »

Does anyone have any experience/information concerning these new "Family Style" radios that use the 900 Mhz band (spread spectrum)?

http://www.trisquare.us/exrs.htm

I am just curious what they're all about, performance, etc.

73's
Brian
KB1OCC
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W3LK
Member

Posts: 5639




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« Reply #1 on: September 11, 2007, 01:45:28 PM »

Lots of marketing hype on the web site, it seems to me.

<< eXRS radios are free from any Federal Communications Commission (FCC) user licenses, can be used at any age and for any purpose (personal or business), unlike GMRS radios.>>

Sounds like a Part 15 device, to me.

73,

Lon - W3LK
Naugatuck, Connecticut
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AA4PB
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Posts: 13032




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« Reply #2 on: September 11, 2007, 05:02:01 PM »

I believe the radios are 1W output - not part 15 but authorized license free on the 900 MHz ISM band. Here's a link to Motorola's version: http://www.motorola.com/DTR/

Everybody uses the same frequencies. The channels are really digital codes.

My first info on similar devices in this band was about 2 years ago - a professional grade wireless microphone.

I question the FAQ that says as many as 10,000 radios can operate simultaneously within range of each other. Perhaps if the communicators are close enough to have strong signals.
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KB1OCC
Member

Posts: 172




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« Reply #3 on: September 12, 2007, 08:06:43 AM »

I was really curious about the "claimed" range.  I noticed that the vendor skirts the issue by saying the range is better than the UHF FRS/GMRS radios.  Of course, we all know that those radios could only achieve those ranges mountaintop to mountain top.
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AA4PB
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Posts: 13032




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« Reply #4 on: September 12, 2007, 06:09:28 PM »

Well, 1W is 1W and digital usually doesn't have as much range as analog (down into the noise). At ground level in a suburban environment I'd estimate you are looking at a bit less than a mile.

I've seen GMRS radios advertised as 17 mile range. I'm sure that is out in the Arizona desert or on the ocean.
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KE3WD
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Posts: 5689




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« Reply #5 on: September 12, 2007, 11:06:58 PM »

Wonder if one of these could be used for the engine to make yourself a spread spectrum amateur exciter/receiver on the cheap...


Bet it could.  


KE3WD
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N9HN
Member

Posts: 0




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« Reply #6 on: September 19, 2007, 07:45:48 AM »

Greetings,

Another ham friend and I each purchased four of these radios.  After several weeks of in depth tests, I returned mine because they did NOT perform nearly as well as our FRS/GMRS radios.  Often, they would loose sinc and not communicate at all until both were turned off and then back on.  We would have to call each other on our HH and request a resinc.  Our best "DX" was about half a mile in relatively open country with some trees.

Audio quality was fairly good but with digital artifacts.

When they worked, they worked fairly well and the communication was indeed secure.

73, Herb
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KE3WD
Member

Posts: 5689




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« Reply #7 on: September 20, 2007, 10:23:25 AM »

 I have found that to be the problem with all digital voice modes.  

It is either "there" or it is not.  


No weak signal down in the noise copy ability at all.  



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KD8DVR
Member

Posts: 30




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« Reply #8 on: September 22, 2007, 11:52:46 AM »

I have a set I reviewed.  My performance actually was comparable to an FRS/GMRS "bubblepack".  I got just over a mile.

The radios did lose synch when they got far apart.  If you gave them about 20 seconds or less when going back in range, they'd resynch.

I can see their uses where everyone else overcrowds the frs band.  The family and I could talk interference free.
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All items presented here are personal opinion only and may or may not deviate from actual fact.
PU2DTO
Member

Posts: 1




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« Reply #9 on: November 27, 2014, 04:31:20 AM »

Hi, folks.

Sorry for bringing back this topic.

I'm looking for belt clips for these Trisquare radios.

Please contact me if you have a broken radio and want to sel the belt clips.

Regards.

PU2DTO, from Brazil
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K9MHZ
Member

Posts: 448




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« Reply #10 on: November 27, 2014, 07:59:28 AM »

Hype and trash.  With all of the ISM on 33cm, anything introduced there with grand claims is pure snake oil and BS.  There's one born every minute.
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G3RZP
Member

Posts: 4962




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« Reply #11 on: November 28, 2014, 01:11:39 AM »

If they are truly 'spread spectrum' i.e. DSSS, the near-far problem with users of the spectrum will limit range.
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AA4HA
Member

Posts: 1640




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« Reply #12 on: November 28, 2014, 06:00:39 AM »

I deal with the 902-928 MHz (ISM Band) data radios all the time. If the SNR falls below 16-18 dB you will get a high error rate and the radios will constantly be trying to re-synch with each other. We use them in fixed, point to point and in master-mobile applications and we try to keep the signal levels better than -80 dBm and the SNR's better than 20 dB. When the signal level falls below -80 dBm (down to around -100 or so) or the SNR falls much below 19-20 dB you get connectivity issues. On a Spread Spectrum type radios the re-association time can take several seconds.

Yes, you can get that 15 mile range. With gain antennas, (they are limited to 36 dBm EIRP) (about 4.5 watts) at height (line-of-sight with no trees or buildings) you "can" get that distance. It is allot of work to make that happen and is definitely not a portable solution.

Fixed to mobile, 3-5 miles, mobile to mobile 1-3 miles, portable to portable no more than a mile or so.

You are going to be limited by the gain of the portable antenna. In a portable it is more like a negative gain. Your height above ground and line of sight obstructions.

What they are using is just a higher powered version of a cordless phone and making claims about it being FRS-like. Yea, ok, make that claim. I will stick with UHF GMRS or VHF MURS.

(GMRS license WQLJ327)
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Ms. Tisha Hayes, AA4HA
Lookout Mountain, Alabama
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