Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Jan 19, 2010, 07:02 PM
Carlyle Harper is offline
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Discussion

Practical difference between 1.2ghz and 2.4ghz LM 1 watt TX


What are the practical differences of the Lawmate tx/rx combos at 1 watt between the 1.2ghz and 2.4ghz band?

I only want to compare Lawmate to Lawmate and only same power to same power. Aside from the band they operate in, keep all other variables the same.
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Old Jan 20, 2010, 10:15 AM
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I would be curious too to know the answer!
Old Jan 20, 2010, 11:43 AM
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I own both. I get much greater range with the 2.4 system. My 1.2 tx also seems to get hotter. They look identical to one another so don't remove the sticker or you can get them mixed up.
Old Jan 21, 2010, 06:46 AM
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would be interesting to know why the 2.4 gets more range... i was thinking about the 1.2 (1.28) but this news makes me re-think about it!
Old Jan 21, 2010, 07:06 AM
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My only explanation is that frequency set isn't as clean in my area or the receiver isn't as sensitive.
Old Jan 21, 2010, 07:16 AM
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reading thru threads (i'm not expert) i agree with sensitivity of receiver, which in 2.4g has been better developed. but only my opinion from thread reading
Old Jan 21, 2010, 04:02 PM
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Just going to post the below quote, to point out obvious issues with 1.2GHz Txs.

Quote:
Warning!
Important note for US and Canada customers:

Please note, channels 1,2,3,4,5,6,7 of this transmitter are outside of the allowed frequency spectrum for US and Canada. These channels cannot be legally used even if you have a Radio Amaterur or HAM license. Please make sure that you obey your countries rules and regulations around use of these devices and use them only on channel 8. New Generation Hobbies cannot be held responsible for using these transmitters on channels which are outside of the legal allowed frequency ranges.

For all other countries please check the regulation around amateur use and frequency spectrums before ordering this product
Cheers,

Sander.
Old Jan 21, 2010, 04:43 PM
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i've neen told before and i must apologize again. i always refe t 1.28g (legal) writing simply 1.2
Old Jan 21, 2010, 10:50 PM
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Somehow long ago I had dismissed the 1.2ghz systems as poor performers compared to the 2.4ghz systems by the same manufacturer and so the reason for this post was to see if my myth on the performance was true or not. So far the myth I believed in is plausible, including more limited range and lower sensitivity.

I'm aware of the legal channel limitations of both transmitters. Maybe I should clarify that this thread is about practical performance differences. So let's leave the legal discussion alone.
Old Jan 21, 2010, 11:16 PM
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leaving the legal things out

certain frequencies are not used, and not legal for a reason
out of allowed use

that is why they are so clear

its that simple

Carlyle in your case 1.36 would work the best
with a great video tx and rx that are set to that frequecy
ie antenna length and specific tuneing

but with gps not so
Old Jan 22, 2010, 09:43 AM
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Quote:
Originally Posted by David22 View Post
leaving the legal things out

certain frequencies are not used, and not legal for a reason
out of allowed use

that is why they are so clear

its that simple

Carlyle in your case 1.36 would work the best
with a great video tx and rx that are set to that frequecy
ie antenna length and specific tuneing

but with gps not so
Are you saying the 1.2 tx/rx inherently performs better on some channels than others?
Old Jan 22, 2010, 09:50 AM
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yes some frequencies will work better than others

depending on the enviroment

including the area you fly and what is installed in your plane and ground station
Old Jan 22, 2010, 03:11 PM
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opps sorry. wrong thread
Old Jan 23, 2010, 12:03 AM
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In theory 1.2 GHZ should go further than 2.4 GHZ, but the theory does not take into account that the 2.4 GHZ video equipment is made better, and that the receivers are better.

So in reality, the 900 MHZ and 1.2 GHZ equipment has shorter range than 2.4 GHZ. Its not a matter or theory, or clean or dirty frequencies, it comes down ot the capability of the electronics. 2.4 GHZ video equipment has bee much better developed with better receivers and the range is much better.

Mike
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Old Jan 23, 2010, 02:29 AM
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The difference is

what is being used in your area

and what equipment you use for fpv

and which 1.2 or 2.4 sytem you use and antnnas etc.


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