RC India

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.. :thumbsup:

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..  :salute:

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.... :hatsoff:

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.. :salute:

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! :o

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.

 :salute:

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.

 :o :o :o

Wowie! You are like Tony Stark!  :bow:

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

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) :giggle:, and only 10% people come up to the expectations of the employer or 1% to the 'Scientific pool' of the nation  :banghead: >:( . (My figures are only indicative, not absolute or 100% authentic, I may add, but fairly good. Don' jump @ my throat  ;D . 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 ?

VU2PTI is OM Pradeep


Sanjay

Sir, i came in to RADIOying, because of the compulsion of my Respected Teacher,  Chathunni Sir, when i was in my academic years of electronics.. then on that time my Colleagues were, Mr Hamsa, Mr Ali, Mr Pradeep, Menon Sir, and some.. after that i got an oppertunity to go for a research, in radio guiding and avionics, by Shreedhar sir, an aviation engineer.. then came neutral, as married, and forgot.. then 2005, i brushed it all agin, and was too tough to erect antennas as i was residing at a rented home.. so, then again, gone in dark.. after that, in 2007, i was back in research, in avionics again, to submit some projects from my side.. and continued.. and now, i am in a tie up with Academy to develop some RADIO gadgets for Academy.. and not active anymore, and restricted due to my research programmes.. and waiting to go for examinations for advanced radio lisense, from Trivandrum centre, but my health issue not allowing Sir.. so, waiting to request to Vinodettan to take me at Trivandrum, by car, as the office is situated near to his home.. and waiting to get some money for taking further lisense.. and hope will conduct exem, before my health stae strikes bad.. and at presnt i am working on some arrangements to study about extra terrestrial radio phenomena... but still idle.. no one to help me.. and will be back active as my contract ends this year..  :salute:

Roopesh
point taken! but you still haven't answered my question of your call-sign, i can help you find it if you have forgotten it or you have lost it, so will any help on WPC front (Pilots RT license too is issued by them), all the best

Sir, surely i need your help as i want to recover all, and yes need new radio lisense, and will mail you personally, as i need a permission from Academy, as i submitted my papers there.. and got an instruction to keep as silent.. and i am working on some radio devices for ship and aero model division.. i will mail you the sign personally, Sir, as i do not know is it feasible to publish sign as i am in a research programme..  :salute:

Roopesh !
Dont worry about your HAM C/S it is like your name, it is what people call you by, without the C/S how will anyone contact you, because you are on a common grid calling, it is as open as it can get,

So safely you can tell your Ham C/S, go ahead

Are you an Elmer ? with your experience you will be. no?

Sir, i am not much deeper in to HAM ing.. and most of my efforts is based on developing needed gadgets.. and as i am not much active, not in to a mentor side.. and here, i do not have anyone to guide me anymore.. but  i want to be active back Sir.. at Vatakara, i hope have an office related to this and have to try with them.. but i think, with that effort, and money, i can make many good models .. especially at this bad stage of health..  :salute:

Roopesh

I think it is time you came clean on your fraudulent claims. You have gone through this before, apologised, but are back to your old ways. You DO have talent. Nurture it. Give up on the - unnecessary, in my opinion - BS.

Please do not miscontrue this any kind of threat. But there is much too much evidence to shoot your claims to smithereens. Would you like it made public?

Its your call.

This post is repeated in another thread, which is of direct concern to my field.

Still no answer for what vmj asked , are u a ham. ? If so please reveal
Your call sign . 73' s de vu2 sep

Santa
the question is answered !

Roopesh
That was the aim, we are modellors by hobby not by line of work, HAM, flying, audio, electronics etc etc are some people's line of work, like sachin lets his bat do the talking, all of us should let our work do the talking, what say ? like i told you before, in our locality we may be kings (Above mediocrity) not in the cyber space, cyber space cuts across distance, cast , creed colour and region. SSWC will be seen through, we all need to be careful.

an elder brotherly advice, hope you remember it for life, for your good

no point in hounding the poor chap - he is
not harming any one .... let him be.

The gaffes were getting bolder when people kept quiet. Writing meandering ramblings when you don't have the answer didn't work in school exams, it doesn't work here either.

“When boasting ends, there dignity begins.”

Saikat da -

If you just look at the very first post in this thread, and Reply #2, you will see that the answer was not towards the question at all, and went way off on tangents.  It confuses people, especially beginners.  That is what prompted me to post Reply #14.

I have been notified in private by multiple members (especially senior members) about how we are going off on tangents on many questions, and about some questionable claims.  While we respect Roopesh for his skills and perseverance in many areas, we also need to watch out for the quality of content, especially technical content posted here. I wish I had 25% of his abilities in many areas ! 

It is in his best interests too, that he feels there is some scrutiny of his posted content here. I am sure he understands that we all are his well-wishers.

Oh God - not again........I just wasn't paying attention to this thread and hadn't noticed this fracas earlier. Pity. Not that I would know a diode from a resistor.

Btw Rcpilotacro - sswc - are we talking about Surface-Subsurface Warfare Coordinator here? Please explain...........

VC

it is Sub Surface alright and related to WC too, and i am saying this 'with confidence'....:giggle: jokes apart

Anwar Bhai

+1, fresh young children need to be guided, taught, correct things about RC and its associated electronics, take my case for example, though i have been into electronics from my childhood i dont think i am anything beyond Rookie as far as electronics is concerned (For that matter on anything), therfore participation on electronic discussion is minuscule and rest, weighed and crosschecked

Roopesh
you are one of the very good modellors, i have always been your fan and will be, have no doubts on that

Sir.. my all works are humble to me, and theres no any cliam, and still trying to make some thing within my circle.. and still i have lot more things to do, but i need time, as i am not a rich person to grab it all fast, and above all state of my health is not favourable to me.. and i told you i need all help from you to learn and achieve many things from you, but need time.. Sir,and always respects your advices and living with that grace.. with great respect.. :salute:

dont take it to heart, it was just a friendly advice/suggestion/correction, you are a Forum Hero

It couldnt have been put in better words. Resonates my thoughts 100%.

Sure Sir..  :salute:

VK2KCB licensed 1970s but not active for a few years. Power is a killer in many ways. Kills batteries, kills output devices and can kill people. Also known to kill friendships when an overpowered user happens to knock another user out of the skies. Believe me it can happen. I have a very nice gentleman who has a business which backs onto our flying field. He has managed to do something no government laws can, restrict our flying area. Should any flyer stray less than 400 meters from his establishment all contact with any aircraft using 2.4ghz is lost. You can imagine the problems that causes.

This gentleman decided he required better WiFi coverage than could be gained from a standard cheap modem. Did he purchase a better modem, move his modem and inbuilt antenna to a better position or purchase a better anttenna system, NO, he purchased the cheapest and nastiest WiFi range extender he could find. He leaves said equipment on permanently and even after being asked nicely if he'd switch it off on weekends when most people fly, he's refused. After being informed that he is breaking a number of laws, he simply laugh and tells us he has more rights to run his business than we have to fly.

Please remember this little fact. As soon as you fit one of these "gadgets" to your transmitter, you are breaking the laws of your own country, some may add here, you are also breaking common good manners and unwritten laws most RCers abide by. If I saw a Flyer standing anywhere on our flying field using any form of "range extender" or Amplifier, he wouldn't be using it for long, he would leave in one direction and his radio equipment in another. Most cheap amplifiers are not built to any code, it's pretty much guaranteed to do the job as cheaply as possible. I saw someone mention on this forum that his system was so powerful it knocked his Bluetooth off the air, yes and every user of 2.4ghz in the area.

Forget power, accept what you have, usually 100mw from a standard transmitter. Not enough you say? How much power would you think it would take to transmit a signal to say, the UK. Not on 2.4ghz but let's use 28mhz. OK it's a long way from 2.4ghz but bear with me. A friend of mine was into CB radio, he heard about "Skip". It could take a signal which couldn't get 10 km and make it travel many thousands of kilometers. So he invested in a linear amplifier ( a funny term because there was little linear about his signal) He tried for weeks to talk to Japanese, Americans or Mexicans. In the meantime he was wiping out half the town's TV reception and anyone else using any form of radio comms. A weeks later there was what's known as a QRP contest (a low power competition to see who spoke to whom in the Ham fraternity) I invited my friend along for a look see. Over 50 contacts were logged with 25 different countries. "Where's the amplifier"? my friend asked. "Outside" we all answered. I took him outside and pointed at the antenna, a 5 element yagi. No amplifier, just a darned good antenna. The transmitter was housed in a small biscuit tin, mainly because the builder couldn't find anything smaller.

The moral of the story? it's got nothing to do with the transmitter's power out, it's all to do with the antenna. The correct antenna on an RC radio can get places pure power can't. No interference, no one dies and no friends are lost. Since that day I've worked over 200 countries and made over 20 contacts in Canada using only 200mw. Many people have done even more with even less.

Personally I'm not into FPV except for close in work. I don't care about range, I prefer to see the plane I'm flying. Long range is only for record seekers and egos. Any records broken for long distance cost the record holder many thousands of dollars. I'd sooner watch a video of a good FPVer flying his aircraft with precision within 500 meters than someone out to break a record, I've watched them and they are boring.

By the way, my friend is now dedicated Amateur Radio Operator and he has some of the best antennas you'll find anywhere, not one amplifier to be seen. Lecture over   Stu