friends i want to know the signal range of transmitters like turnigy9x,flysky 6ch,flysky9ch......................plz help me

sorry i have posted in wrong section,,,,,,,,,,,,,,,

Jeevan, Admin, or any Moderators may change your posting from here, to apropriate segment..

The effective control range of a hobby radio falls in many factors.. still most of the professional hobby radios are based about 800 mW to 1200 mW, or in to RF power about 16 to 22 dbm,is almost enough for a good control range.. the effctive transmission range of a radio, TX depends upon the position of hold, geaographical variations, buildings, metallic structures, and the type of the antenna used etc..if you use a stick type antenna, will give you all around performance.. but if you add a parabolic refletor to stick antenna, will increase about 25% effective range.. but the propagation will be directional.. in a MHz based set, you can use cage antennas, or can streach a loop antenna, in between posts or coconut tress, with a span of 5 to 6 meters for a long range..

proper positioning of the Rx antenna also plyas an important role of effective range.. a binded antenna dramaticcally reduces effective range, as the signal cancells each other in phase.. you can place antenna in 90 degree shift for a 2.4 Ghz set, while can be used a parabolic cage for MHz system..so, try with streached antenna once.. tell us with a trial and error method.. after that tell you how much distance that i got with these radios.. and you do not need to worry about brand name.. 80% of radios are coming out from same factory..

Quote from: roopeshkrishna on April 02, 2012, 12:12:52 AM
Jeevan, Admin, or any Moderators may change your posting from here, to apropriate segment..

The effective control range of a hobby radio falls in many factors.. still most of the professional hobby radios are based about 800 mW to 1200 mW, or in to RF power about 16 to 22 dbm,is almost enough for a good control range..

800mW to 1.2 Watts !! Are you serious ? Is that for Professional Radios ? Because all the Hobby Radios sold by OEMs have max 100-200mW output to meet the Regulatory norms in most of the countries (and even lesser power in most of EU). I am not counting some people using a 1-2Watt 'Wifi Boosters' after the Transmitter's Amp Stage to increase the range. Though theoretically fine and even successfully used by many FPV flyer, this is not a well accepted and proven/reliable technique.

Coming back to the actual question, if one has bought a proven OEM Radio like Futaba, Jr, Sanwa, Hitec, MPX and even Turnigy etc, and there is no known issue with the model, you can always fly a big plane of 30-50cc size till you can see it. Typically an off the shelf 2.4Ghz Radio gives you the range upto 1KM which is actually beyond the limit you see a Nitro/Gasser with naked eyes. So if you can still see 'It', you can control it.

The long range Radios to control model in BVR (Beyond Visual Range) scenarios of FPV and AP needs special 'Semi Pro' Radio module like 433 UHF module by Thomas Scherrer/ImmersionRc/Chain Link etc which claim to give ranges in excess to 50 KM with proper tuned Antenna and Tracker  system. But let me warn you, right from obtaining to proper usage of these system needs very proper understanding of too many things like Local Laws, Weather Pattern, Flying, Radio technology etc and should not be attempted by newcomers in the interest of the flying fraternity and own safety (public/LE).

Ujjwana, ( calling name, because no idea about your age..) the maximum feasible rate is about 800 to 1200 mW.. above that it is serious to handle.. most of the present radios are in to 16 to 24 dbm of max.. pumping out the maximum power as RF is not a great deal, but extra care should be taken.. 

I am much junior in this, if you don't consider my Balsa chuck Gliders in early 1990's. Anyway in my office space salutation is non existent. But I have a habit of doing the things either right or not at all.

I dont know if we are on the same page and talking about the 2.4Ghz Spectrum and not FM band, which might have different specs and restriction.

Though in US the max limit for 2.4Ghz in only 750mW, you can get a HAM license and go up till 1Watt.
But most OEMs limit themselves to much lower power of only around 200-300mW, which is totally adequate for 'Visual Range' flying.

Please read some other RC discussion forum and also official site of OEM like Futaba:

http://www.rcuniverse.com/forum/m_6188151/anchors_6934045/mpage_20/key_/anchor/tm.htm#
http://www.futaba-rc.com/faq/service-faq.html#q593
http://www.flygsw.org/yabb2/YaBB.pl?num=1206383582/32

Ujj..i started experimenting with radio from my boyhood.. and i am myself is a prey of RF radiation.. and i am a HAM holder , and most of my works were based on this project to make a good trans receivers.. and i am thanking to my ever respected Sir, who is a professor who guided us to a bright world of electronics.. can assemble any radio in to any frequency any watts.. but make sure all are protected..because RADIO is an immense power of mother nature.. and for a visual range of control, we need only a three volts 500 mAmps, if the set is calibrated properly..

thank you sir for your wonderful advice@roopeshkrishna ..................
and also thank you sir for your wonderful advice@ujjwaana .................

Jeevan, you can buy any of the mentioned radioset, by you, as those sets are far value for money, and works well.. because, if you examine once, deeply, you will find all circuits are same, and yes works well because all those radios are based on a well proved radio set from a very reputed company just before.. make sure your intended radio set is equipped with an easy servo reverse option on ground, without the help of a Personal Computer.. have some nice RCying....

The RF power output is really all over the map and rarely exceeds 300mW.
Here are some samples of R/C Tx RF power, as provided by the mfg's technical records:

Futaba T6YG: 157mw/72Mhz, 99mW/75Mhz.
Hitec Flash 5: 292mW/72Mhz.
JR EX400: 152mW/72Mhz.
Multiplex Cockpit: 100mW/72Mhz.
Multiplex Profi: 316mW/72Mhz.
Most 2.4 ghz tx--27dBm (~500mW) RF output

most of these Tx draw 130 to 180 ma from the battery.  

Range of your Tx will depend on how well this power is coupled to the antenna which transmits it.

I have a RF section on 35 mhz which gives a ground to ground range of 350 meters and draws 150 ma from 9.6 volt batt, when coupled to the antanna by a base loading coil.
Same Rf section  with a center coil loaded antenna gives 430 meter ground to ground range with only 90 ma current drawn.

All will give a beyond vision range which will be at least 2.5 times the ground to ground range

Jitender

sir,
     presently iam using flysky 6 ch. which doesnt have servo reversing option in it.sir actually i have built a quadcopter with hk control board and now iam trying to make my quad advanced by using ardupilot and also gps.i need some advice from you to choose a best fpv system for my quad..............................thanks in advance sir

by connecting the TX to PC, take a little time, to se up the controls.. mix it up.. look in to instructions once..
Jithendar..with a 3 volt 500 mA battery we can pump out RF to 400 meters with a counterpoise tuned antenna while droping a mere 250 mAmps.. anyhow great knowledge..thanks for sharing..

Here we go around the mulberry bush! And it's not early in the morning.

Ujwanna, I am with you. I feel this mumbo jumbo and virtual hogwash masquerading as technically qualified input has to stop in the wider interests of people who will take this as gospel because of the authoritative style.

But, from prior experience, the cat will not be "belled". And "life" will go on.

Oh boy!

If the answer is limited to the original question ("the power output of *widely used* RC radios like the models listed), Ujjwal is right. 

What is possible with self tinkering or building custom RF sections or theoretical/practical maximums may mislead the original poster (and others).  There is no harm in posting possibilities, but it should come after answering to the point on the question raised.

 

Quote from: roopeshkrishna on April 02, 2012, 08:01:20 PM
Ujj..i started experimenting with radio from my boyhood.. and i am myself is a prey of RF radiation.. and i am a HAM holder , and most of my works were based on this project to make a good trans receivers..

1. Did my first soldering in Class 2
2. Made my first Electronic project without any help in Class 3
3. In class 8th, made the complete Tx/RX section of 20Meter modified NR60 HAM transceiver, including all the RF Coils, Silk screen PCB, Ladder Filters, under the guidance of VU3NWZ and VU2OMM (silent Key)
4. Passed my ASOC Grade II/Morse with flying colors in class 9th (Minimum Age requirement)
5. WPC never sent me the License. Went to WPC while in College in Delhi (4 years later). They could not trace my score/DD. Was already much in love with Computer, much of instant Karma, so never pushed back...

Have done other thing in between, that I would NOT like to brag about, knowing there are much qualified engineers, of the correct department, on this forum.

I think the FCC/CE guys are enough qualified to correctly certify the power output from the final stage of a RF AMP and, and would grossly underrate the output 405 times.

Get a good Field Strength Meter, and I bet the power radiated from a Futaba 7C/8FG/10CAG/18MZ, Jr9x/11x/Sanwa 10G/RDS800, Hitec Aurora would not exceed the specified levels. I Can't say about cloned/phony branded Chinese Tx which put a fake CE/FCC certification.

Remember, pumping more power from the RF module is the easiest thing to increase reliability/range. It is much more difficult to achieve the same result with 1/5 of that power, and that what good OEM brands do.

Proof of the Pudding is in eating it. People seeking the correct rating should look at the CE/FCC certification mention ed with each Radio being sold in the white market. Scope and possibilities of a Home-brew radios is practically limitless.

(Remember, pumping more power from the RF module is the easiest thing to increase reliability/range. It is much more difficult to achieve the same result with 1/5 of that power, and that what good OEM brands do).

This is why I gave this personal experience /example.

(I have a RF section on 35 mhz which gives a ground to ground range of 350 meters and draws 150 ma from 9.6 volt batt, when coupled to the antanna by a base loading coil.
Same Rf section  with a center coil loaded antenna gives 430 meter ground to ground range with only 90 ma current drawn.)

The design of local brand and good reputed brands may be the same but the final refinements in the reputed brands gives them better range.

Here a posted test result of turnigy 9x.
http://www.rcgroups.com/forums/showthread.php?t=1403635
3KM tested best and the worst 780 mts with all sorts of infringements.

I just request you all dont bother this until and unless you are going to use Grateplanes.
And a 750 mts length of visualibility will make you confused about the direction of the plane.

And also to be noted that 300 feet height is the safe height for flying hobby model aircrafts and FUV inside private area.

So, need not worry about the range of professional proportional model control radios.

It also depends upon other factors like Humidity, Carbon particle dencity/Conductivity of air, presence of charged particles and it's turbulance (Clouds) + lots of items if you really want to know. But for HOBBY, WHO CARES, we are Well BELOW the safety limits and so don't even bother about that.

Quote from: ujjwaana on April 03, 2012, 01:16:37 AM
1. Did my first soldering in Class 2
2. Made my first Electronic project without any help in Class 3
3. In class 8th, made the complete Tx/RX section of 20Meter modified NR60 HAM transceiver, including all the RF Coils, Silk screen PCB, Ladder Filters, under the guidance of VU3NWZ and VU2OMM (silent Key)
4. Passed my ASOC Grade II/Morse with flying colors in class 9th (Minimum Age requirement)

Have done other thing in between, that I would NOT like to brag about, knowing there are much qualified engineers, of the correct department, on this forum.

Wowie! You are like Tony Stark! 

Quotei am myself is a prey of RF radiation.. and i am a HAM holder 

what is your call sign, mine is vu2sep active for the last 20 years, seems you are not much active on these days

Quote from: Swapnil on April 03, 2012, 08:04:47 AM


Wowie! You are like Tony Stark! 

Naahhhh all lost in slogging for an entrance examination which used to be so reverted once upon in India - JEE, specially for North India where there were hardly many Engg Colleges.

Glad that newer kids have lot many options today, and they can peruse their passion while not bothering that much for life beyond 10+2...

Hi Ujjwaana, now you are talking the ground realities, I would say.  Don't loose the enthusiasm and spirit. Now, it is all a matter of setting up colleges by the dozens, produce Engineers by thousands. It is a totally different matter that only 10% of them are 'employable' of which only 30% are suitable for the job they enter in (square pegs in a round hole) , and only 10% people come up to the expectations of the employer or 1% to the 'Scientific pool' of the nation  . (My figures are only indicative, not absolute or 100% authentic, I may add, but fairly good. Don' jump @ my throat  . Einstein, I think never had a formal degree).
essaargee.

roopesh ! i missed this thread

what is your callsign ? Since when are you a HAM operator ? you are multi talent and multi faceted personality. eager to know your callsign,

Did you know King Hussien, an avid HAM enthu

i googled your name Roopesh and came up with this callsign Vu2pti, is this your callsign ?