SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
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Old Sep 11, 2008, 05:35 AM
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zaguruinzasky's Avatar
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After 3 emails with the Italian Ministry of Telecommunications I decided to call them to have a straight answer about what is legal and what is not in Italy. They confirmed me that the only legal freqeuncy for aeroplane models in Italy are 35mhz and 40 mhz at maximum of 100mw. No doubt about it.
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Old Sep 11, 2008, 05:41 AM
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I think you got that answer because they simply dont know :-)
if you ask about RC of model planes, they just look up and find the normal 40 and 35MHz bands.

Italy is EU too, so you must have tons of free ISM bands in the UHF range
where you can transmit with no licence.

ask them about telemetry ?
if you can use the 410MHz to 450MHz band for data telemetry ?
without a licence ? and what power you can use with no licence ?
ask if radio amaterurs with a licence can use that band for data telemetry ?
and if they in that case could controll an rc plane for example with that telemetry,
and ask how hard it is / what cost, to get such a licence

see our radioamateur frequency list.
http://www.webx.dk/oz2cpu/dk-hf.htm
here it cost like 100 us $ to take that test, and nothing else !
no fee to pay every year, the test is an easy multichoise, with like 20-30 questions, the better you are the higher class licence you get,
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Old Sep 11, 2008, 07:23 AM
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Impulze's Avatar
Sweden
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In sweden 438Mhz - 439Mhz is free for use with telemetry, radio control, Shortwave radio.

I also think that Italy have something similiar.

//Matte
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Old Sep 11, 2008, 07:28 AM
Smoke on , go !
zaguruinzasky's Avatar
Verona - Italy
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I talked with the Ministry... they make laws, they probably knows it. I explained in depth what I was looking for: a free of use frequency to pilot my rc model far away from me. Some of those frequencies are for the army too. Those 3 bands that I wrote are simply not available.
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Old Sep 11, 2008, 07:30 AM
Smoke on , go !
zaguruinzasky's Avatar
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maybe the sellers of these products should be the one to give a certification of free use or whatever in the country where they sell.
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Old Sep 11, 2008, 07:42 AM
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You need to specifically ask for 'free ISM bands in the UHF range where you can transmit with no license in the 410MHz to 450MHz band'

Don't talk about model airplanes and maybe also not about telemetry. They must be able to give you some frequencies.
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Old Sep 11, 2008, 08:03 AM
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http://en.wikipedia.org/wiki/ISM_band
see region 1, europe.

more here:
http://iaf-bs.de/projects/ism-433-868.en.html

more here:
http://www.iaru-r1.org/VHF_Handbook_V5_11.pdf
page 73 section i
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Old Sep 11, 2008, 09:03 AM
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Thomas,

I have been trying to investigage the possibilities in my country. I am not yet planning to buy your system, but it could help for fellow Dutchmen. I have found a few frequencies, but I am not sure yet about what to use.

My question is, does PMR 446 and DMO ring a bell to you?
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Old Sep 11, 2008, 09:20 AM
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pmr 446 is free in most of europe, 500mW narrow band FM
only allowed to be used as handie to handie, no external antenna allowed.
I can offcource use the same band, but not really smart,
if people use them near your plane :-)
but ISM 433 and 434MHz is actually free in europe to be used with no licence,
the normal usage is 10mW narrow band, but if you spread spectrum or channel hop,
500mW could also be legal, here in Denmark we have 10-15 channels allocated for RC and telemetry usage, EU and etsi rules also apply to most of europe, so I cant belive it is not written in your local rules.
but an easy way out of all this problems is to take a radioamateur licence and do it legally.
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Old Sep 11, 2008, 09:28 AM
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Attached is an extract from results in our National Frequency Register: http://www.agentschaptelecom.nl/nfr/main_nfr_uk.html (English)
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Old Sep 11, 2008, 11:27 PM
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Hi Thomas, I see you are a whiz at electronics, have you considered designing / building a HeadTracker for FPV purpose. I'm sure anything you came up with would be high quality, reliable and easy to use. The ones on the market at the moment all seem to have pros and cons but don't meet all of our requirements.

cheers Geoff
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Old Sep 12, 2008, 01:55 AM
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Thanks for the message Geoff about HT.
abit OT to this thread but I keep it short.
I can inform you I am one of those Intelligent Flight dudes, we are a team of several design engineers, some of the others work at this moment on a HT.
I can say about HT in general : it is an impossible task to make a HT that is good and stable and have no drift and hight resolution with smooth and fast reactions and at the same time low cost ! it is impossible to do all that at the same time, so to make a product that will be low enough priced so anyone can afford it, you always have to compromice something.
If you need to know more about IF and our products and participate with ideas and suggestions, please log into intelligent flight forum and post there so we kan keep all your good comments and ideeas.
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Old Sep 12, 2008, 02:17 AM
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oh I forgot to explain about the RC transmitter,
I think it is normally a matter of design and taste and feel and availablility in your area that helps people in the select.
if you allready own an RC transmitter you know and like to use, then just be happy and continue to use it,
most likely the PPM output will be compatible with my UHF system, but in the case you dont own a good computer RC transmitter
and want to purchase one, maybe even specially for the useage together with my UHF transmitter system.

in that case, I recommend Multiplex Royal Evo 9 due to several features I like:
1 metal holder where my UHF TX unit fits perfectly (see pictures on my web)
2 it uses a trainner plug with power
3 battery current is measured and useage time constantly monitored, both charge and discharge
4 battery management and alarm also work with my UHF tx unit connected
5 total freedom when assigning servo functions
6 mixing and fixing anything can be done on any function
7 easy to use and easy to program
8 can he held with one hand and plane thrown with other hand
if you only want to use it with my UHF system, try to purchase it without any RF modules and also with no scanner module (cheaper)
Evo 12 have more models memory, more mixers and such, and can output 12 servo signals (later I can support more channels, but not now)
Evo 9 have plenty of models memory and plenty of mixers for normal people, can output up to 9 servo signals
Evo 7 is a limited version with many things limited, cheap and useless, and no freedom when assigning functions.
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Old Sep 17, 2008, 02:31 AM
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found a place that sells alot of different antennas you can use for long range !
see here : http://www.dmtonline.dk/default.asp?lang=en
click products and wlan to see all the 2.4GHz stuff,
they have a few parabolic types also, and tons of patches and so on.

click antennas GSM/UMTS to see 900MHz antennas.

click antennas VHF/UHF to see some nice basestation antennas you can use with the UHF RC system TX side !
http://www.dmtonline.dk/shop/product...pload/X-50.pdf
see the E plane for 450MHz so you need to mount this antenna heigh to take advantage of its gain when your plane is far away and also hight up.

cheap 1/4:
http://www.centerfireantenna.com/uhf14.html
good for omni use

cheap 3 ellement yagi:
http://www.centerfireantenna.com/70yagi.html
looks good and cheap.
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Last edited by thomasscherrer; Sep 17, 2008 at 02:38 AM.
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Old Sep 17, 2008, 02:58 AM
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hey thomas for this anttanna that you suggested:

http://www.centerfireantenna.com/uhf14.html

Can i use it to extend the range of my RC transmitter to my plane?
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