Wattflyer RC Network: RC Universe :: RCU Magazine :: RCU Forums :: RCU Classifieds :: RCU User Reviews :: RCU YouTube
Home Who's Online Calendar Today's Posts RealTime Post Spy Mark Forums Read
Go Back   WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > General Electric Discussions
Register Members List Wattflyer Extras Articles Search Today's Posts Mark Forums Read Social Groups

General Electric Discussions Talk about topics related to e-powered RC flying

Thank you for your support (hide ads)
Reply
 
Thread Tools Display Modes
Old 04-20-2014, 12:31 PM   #1
Brewerpaul
Member
 
Join Date: Feb 2014
Location: Upstate NY
Posts: 28
Thanked 0 Times in 0 Posts
iTrader: (0)
Friends: (0)
Default Solo range test?

I know that doing a range test before flying is a good idea, but I usually go to the field alone. How can I do this? One way I've thought of is to start the motor, leave the transmitter behind and walk away-- will the motor shut down when I get out of range? This is a stock Hawk Sky, btw. Downside is that I'd lose battery walking out and back.
Brewerpaul is offline  
  Reply With Quote
Old 04-20-2014, 02:38 PM   #2
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,854
View solentlife's Gallery47
Thanked 225 Times in 222 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

This has been a consideration for me and I came up with :

Pair of Walkie Talkies .. or Baby monitors.
Small Key cam or digital video.

Set up model on ground with one WT next to it ... and videocam looking at model.

Walk away from model while operating controls and counting of steps into other Walkie-Talkie as well as saying which control is being actioned.

The videocam will record what it sees on the model and also the sound of what you are doing.... along with how far from the model you are.

OR

You can reverse the WT part by locking the transmit button on the WT next to model ... walk away operating the Tx ... listening to the servos working .. when you hear chatter or the lack of servo movement - that is the loss of command. Video will confirm it.

Sounds a bit involved - but actually it's not. It's about the only way single-handed that I could think of doing it safely.

I wouldn't consider doing as you suggest ...

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is online now  
  Reply With Quote
Old 04-20-2014, 04:06 PM   #3
Turner
Super Contributor
 
Turner's Avatar
 
Join Date: Sep 2009
Location: Tallahassee, FL
Posts: 1,325
Thanked 124 Times in 122 Posts
iTrader: (1)
Friends: (3)
Default

Binoculars can be used as well. It can be helpful to put the plane on top of some non metal object to get it up a couple feet off the ground.
Turner is offline  
  Reply With Quote
Old 04-20-2014, 04:06 PM   #4
fhhuber
Super Contributor
 
fhhuber's Avatar
 
Join Date: Mar 2013
Posts: 2,027
Thanked 196 Times in 187 Posts
iTrader: (0)
Friends: (1)
Default

The range test can easily be done solo... tie the tail of the plane to something or use a tail trap. You can hear the motor respond.

you are testing at a reduced output power... so you aren't going t be walking a mile from the model.


A range test is checking radio communication. Any one control working correctly is proof of that. Checking for flaky connections between RX and servos you need to be at the model to carefully watch for jerky responses, but you don't have to check range at the same time.
fhhuber is online now  
  Reply With Quote
Old 04-20-2014, 04:31 PM   #5
pmullen503
Member
 
Join Date: Mar 2011
Posts: 790
Thanked 63 Times in 62 Posts
Awards Showcase

Scratchbuilders Award 
iTrader: (0)
Friends: (3)
Default

Most Txs have a reduced power range check mode. That will detect most serious communication problems at 30 to 50 paces. You'll typically get better range aloft than you will at ground level.

It's never too late to have a happy childhood.
pmullen503 is online now  
  Reply With Quote
Old 04-20-2014, 04:33 PM   #6
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,854
View solentlife's Gallery47
Thanked 225 Times in 222 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

Its' one of those areas that people come up with solutions that suit them.

And I will say this : I believe that many people do NOT properly range check anyway ... they give a cursory check of a few paces stick this ... stick that ... and go fly.

In the old days of FM - it was much easier ... antenna left down on Tx .. walk away etc. Today some radios say they have Range Check - but some are doubted to actually have it ...
The range that control is lost is for many radios except parkfly RTf - considerable. My FrSky equipped gear will easily outdistance my estate grounds .. such that to find that distance (curiosity as to what distance it would be made me do it !) - I had to use the WT's ... I just could not see the model ..it was just a dot on the ground.
I read various that range check distance can be anywhere from 30 to 100 paces - depending on RTF Parkfly or full range gear. 30 paces is OK - you can still see / hear the model .. but 100 is a different ballgame.

The WT + cam suggestion I made - to me is about the only way I think I can be absolutely certain ... but it's my way and others have theirs. I have the gear at hand to do it ...
Maybe when I get home - I will do a video and upload to Youtube so others can see my idea ...

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is online now  
  Reply With Quote
Old 04-20-2014, 04:36 PM   #7
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,854
View solentlife's Gallery47
Thanked 225 Times in 222 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

Originally Posted by pmullen503 View Post
Most Txs have a reduced power range check mode. That will detect most serious communication problems at 30 to 50 paces. You'll typically get better range aloft than you will at ground level.
I have read other manuals and on-lines that talk about up to and over 100 paces for RC ... most I read say 30 paces for Parkfly gear ...

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is online now  
  Reply With Quote
Old 04-20-2014, 06:15 PM   #8
fhhuber
Super Contributor
 
fhhuber's Avatar
 
Join Date: Mar 2013
Posts: 2,027
Thanked 196 Times in 187 Posts
iTrader: (0)
Friends: (1)
Default

Generally 300-350 ft for Spektrum range checks regardless of RX type.

The Spektrum "park flyer" RX isn't really range limited. its just got that single antenna that can easily be shadowed by the equipment installed in a model, especially if you use it in a larger model.
People have successfully used them in .60 class models and flown the plane to where its a speck in the sky. (I don't recommend that... because of the potential shadowing issue.)

I wouldn't be satisfied with a 30 ft range check on my Parkzone Vapor.

Other brands may give different results.
fhhuber is online now  
  Reply With Quote
Old 04-20-2014, 06:43 PM   #9
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,854
View solentlife's Gallery47
Thanked 225 Times in 222 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

Originally Posted by fhhuber View Post
Generally 300-350 ft for Spektrum range checks regardless of RX type.

The Spektrum "park flyer" RX isn't really range limited. its just got that single antenna that can easily be shadowed by the equipment installed in a model, especially if you use it in a larger model.
People have successfully used them in .60 class models and flown the plane to where its a speck in the sky. (I don't recommend that... because of the potential shadowing issue.)

I wouldn't be satisfied with a 30 ft range check on my Parkzone Vapor.

Other brands may give different results.
I use the 4ch FrSky Rx in a number of my models as it's factory Spec'd at 1km ... unlike most others that quote 300m etc.

Lets be honest the real decider is the Tx in range with sensitivity of Rx secondary factor. So given sufficient power of signal - even a so-called limited range Rx should work far enough for our purposes.

As you say - the single antenna is a factor in shadowing.

I would not use a single antenna Rx in a larger model though and particularly my Wet-Fuel models .. I use the 'Full range' Dual antenna Rx's. I just feel more secure knowing its in there.
I'm sure the 4ch FrSky would work just as well - but nagging voice again !

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is online now  
  Reply With Quote
Old 04-20-2014, 06:51 PM   #10
pizzano
Behold The Renaissance
 
pizzano's Avatar
 
Join Date: May 2012
Location: So. Calif
Posts: 1,023
Thanked 64 Times in 62 Posts
Club: AMA, Marks, Pomona Valley, Prado Dam
iTrader: (0)
Friends: (3)
Default

The Spektrum "parkflyer" AR 400 RX has two antenna's.

Straight out of the manual:

"Range test......You should have total control of the model at 30 paces (90'/28m)......Voltage range 3.5v to 9.6v........TX should be charged at a min. voltage of 4.8v"......most newer Spektrum DX transmitters have a default low voltage cut-off setting (stock) set at 4.1v....obviously, higher voltage rates for both TX and RX is preferred!

All the experienced guys I've flown with never ground range test at less than 300' or football field length.....so that's what how I check range as well.

AMA 928214
pizzano is offline  
  Reply With Quote
Old 04-20-2014, 06:59 PM   #11
JetPlaneFlyer
Super Contributor
 
JetPlaneFlyer's Avatar
 
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 4,253
Thanked 471 Times in 439 Posts
Awards Showcase

5kW  Outstanding Contributor Award  1kW 
iTrader: (0)
Friends: (8)
Default

Yep as per last reply, for Spektrum at least when using the reduced power range check mode you only need to go 30 paces away from the model, so you can easily see if the controls are responding correctly.

The guys who are walking hundreds of feet are probably old school pre-2.4GHz flyers. Back then Tx's didn't have low power range check mode so you had no option but to walk a long way.
JetPlaneFlyer is offline  
  Reply With Quote
Old 04-20-2014, 07:00 PM   #12
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,854
View solentlife's Gallery47
Thanked 225 Times in 222 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

Originally Posted by pizzano View Post
The Spektrum "parkflyer" AR 400 RX has two antenna's.

Straight out of the manual:

"Range test......You should have total control of the model at 30 paces (90'/28m)......Voltage range 3.5v to 9.6v........TX should be charged at a min. voltage of 4.8v"......most newer Spektrum DX transmitters have a default low voltage cut-off setting (stock) set at 4.1v....obviously, higher voltage rates for both TX and RX is preferred!

All the experienced guys I've flown with never ground range test at less than 300' or football field length.....so that's what how I check range as well.
OK - the 400m is dual antenna ... but no-one was detailing WHICH parkflyer Rx .. it was a general discussion ..

There you go - 30 paces ... yeh well - sorry I do not like 30 paces ... not enough in my book.

You also have to be careful because not all dual antenna's are true dual redundancy antenna's .. some are basically a single split to give dual ... Note I am NOT saying that Spektrum is guilty of that ...

As to who and when RC is done - I still maintain that most do not do it properly, in fact I reckon most don't even do it ... as I said - they walk a few paces ... stick this way, stick that way and fly. Like most things - there is correct and documented way to do things - and what actually happens.

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is online now  
  Reply With Quote
Old 04-20-2014, 08:40 PM   #13
hayofstacks
Super Contributor
 
hayofstacks's Avatar
 
Join Date: Jan 2012
Location: Utah
Posts: 1,546
Thanked 112 Times in 111 Posts
iTrader: (0)
Friends: (5)
Default

If spectrum is supposed to range check at 300-350ft then all of mine have been at least 200ft short....

slow stock prop reversal. it flies! easily! 543 watt dual motor bipe slow stick. push-me-pull-you. 242 watt 3 channel slow stick. 365 watt mini ultra stick. 415 watt mini contender. 810 watt ultra stick .25e. 220 watt alpha 450 sport (retired).
hayofstacks is offline  
  Reply With Quote
Old 04-20-2014, 08:57 PM   #14
pmullen503
Member
 
Join Date: Mar 2011
Posts: 790
Thanked 63 Times in 62 Posts
Awards Showcase

Scratchbuilders Award 
iTrader: (0)
Friends: (3)
Default

Originally Posted by hayofstacks View Post
If spectrum is supposed to range check at 300-350ft then all of mine have been at least 200ft short....

My old DX6i said 30 paces (approx.100 ft) in range check mode. Supposedly that was 1/30 of full range. That same radio (in normal mode) would give at least 2400 ft on the ground which was the longest LOS I could get. It's probably more than that in air but I doubt I ever flew much farther away than that.

So if airborne range was at least 3000 ft., the 1/30th claim was probably pretty close.

BTW, Flysky V2 range check mode does nothing. The signal strength does NOT drop. That's why I was doing full power range checks with my DX6i as the control.

It's never too late to have a happy childhood.
pmullen503 is online now  
  Reply With Quote
Old 04-20-2014, 09:43 PM   #15
Wildflyer
2014 President of PSSF
 
Wildflyer's Avatar
 
Join Date: Sep 2009
Location: Lacey WA, 1 mile E of Mushroom Corner
Posts: 1,091
Thanked 130 Times in 126 Posts
Club: Puget Sound Silent Flyers -PSSF & Thurston County Miniature Aircraft Association - TCMAA
iTrader: (3)
Friends: (7)
Default

We used to have a small flag on a stick or wire, that you could clip to a control surface, in such a way that you would see the flag waving back and forth, as you walked away doing a range check.

A bright little flag like they use to mark locations for sprinkler systems would work just fine, or something home made.

An 18" wire clipped to your elevator with a bright yellow or orange flag at the end, is easily seen from several 100 yards.

Dave R, Proud PGR rider.
When you have flying skills like mine,
You become a master at repair.
Wildflyer is offline  
  Reply With Quote
Old 04-20-2014, 11:41 PM   #16
JetPlaneFlyer
Super Contributor
 
JetPlaneFlyer's Avatar
 
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 4,253
Thanked 471 Times in 439 Posts
Awards Showcase

5kW  Outstanding Contributor Award  1kW 
iTrader: (0)
Friends: (8)
Default

Originally Posted by solentlife View Post
Lets be honest the real decider is the Tx in range with sensitivity of Rx secondary factor.
That's not the way I understand it. Transmitter power is limited by local regulations. So basically per region all 'full range' transmitters have the same maximum signal output strength. The effective range therefore is mainly governed by the sensitivity of the Rx.

FWIW European regulations limit power to 100mW which is half of what the US is allowed. France has additional restrictions. Some brands allow switching between these power levels. For instance Spektrum allows switching between power levels except that European Tx's dont have the option for the higher power (illegal in Europe) US setting, they only have the 'EU' and 'France' option.

Other brands for simplicity just produce one power output for all regions, which of course has to be the lowest power to be legal in all regions. I think that (for instance) Futaba and FrSky take this option (owners of these systems please correct me if I'm wrong)
JetPlaneFlyer is offline  
  Reply With Quote
Old 04-21-2014, 05:28 AM   #17
Panther
Member
 
Panther's Avatar
 
Join Date: Oct 2012
Location: Queensland, Australia
Posts: 230
Thanked 9 Times in 9 Posts
iTrader: (0)
Friends: (0)
Default

My FrSkys are 60 mW. I guess a techy guy could easily adjust it higher if need be. I haven't looked into it as the range is more than enough for my needs.
Panther is offline  
  Reply With Quote
Old 04-21-2014, 05:29 AM   #18
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,854
View solentlife's Gallery47
Thanked 225 Times in 222 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

JPF - I am aware of the max limits for different locations ... what I am referring to is the range is determined mainly by Tx capability ... without having to actually say the Parkfly RTF and the better Spekie / Futaba / 9x etc. etc that has full power related to location.

The matter of power is also subject to the format of the signal ... I cannot remember the exact description but I believe that Futaba chose the format that in fact is lower power than some others. It is not only Country related - but also how the signal format is that determines maximum legal power.

In the days before todays digitised computer based radios - it was common at Car racing to see an extra cell stuffed into a 2ch AM set of 27mHz ... whether it really did give an increase in power I'm not sure - but it was not an uncommon practice. A few race meetings I used to attend - I was an addicted electric race fanatic at one stage ! - the organisers banned that extra cell ...

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is online now  
  Reply With Quote
Old 04-21-2014, 05:37 AM   #19
kyleservicetech
Dennis V
 
kyleservicetech's Avatar
 
Join Date: Apr 2008
Location: Wisconsin, USA
Posts: 7,859
Thanked 669 Times in 652 Posts
Club: www.racinercclub.com (I'm the newsletter editor)
Awards Showcase

Outstanding Contributor Award  3kW  2kW  100mph Speed Demon 
iTrader: (1)
Friends: (20)
Default

Originally Posted by hayofstacks View Post
If spectrum is supposed to range check at 300-350ft then all of mine have been at least 200ft short....
My DX8 manual indicates the receiver should operate reliably at 30 paces or 90 feet with the range test enabled. If I point the DX8 antenna directly at the model, the range test for reliable model operation drops to about 60 feet.

DennyV
Retired and the days are just too short, busier than ever!
kyleservicetech is offline  
  Reply With Quote
Old 04-21-2014, 05:41 AM   #20
kyleservicetech
Dennis V
 
kyleservicetech's Avatar
 
Join Date: Apr 2008
Location: Wisconsin, USA
Posts: 7,859
Thanked 669 Times in 652 Posts
Club: www.racinercclub.com (I'm the newsletter editor)
Awards Showcase

Outstanding Contributor Award  3kW  2kW  100mph Speed Demon 
iTrader: (1)
Friends: (20)
Default

Originally Posted by solentlife View Post
There you go - 30 paces ... yeh well - sorry I do not like 30 paces ... not enough in my book.
l
For 2.4 Ghz, the actual distance your radio will work reliably during a "Range Test" of reduced transmitted power can easily be changed by altering the value of a resistor, or two. So, by a minor change in transmitter design of the range test circuitry, you could have a range test for 20 feet, 50 feet, or 500 feet, or what ever you want. For full power range, just about any decent 2.4 Ghz transmitter with a full range receiver will work reliably over a mile or three.

That's a lot different than the old 72 Mhz, (or 35 Mhz) radios. The range test on those transmitters simply involved collapsing the transmitter antenna. Since the antenna could only be made so small because of physical limits, the effective range was about 30 paces with the antenna down.

DennyV
Retired and the days are just too short, busier than ever!
kyleservicetech is offline  
  Reply With Quote
Old 04-21-2014, 05:49 AM   #21
kyleservicetech
Dennis V
 
kyleservicetech's Avatar
 
Join Date: Apr 2008
Location: Wisconsin, USA
Posts: 7,859
Thanked 669 Times in 652 Posts
Club: www.racinercclub.com (I'm the newsletter editor)
Awards Showcase

Outstanding Contributor Award  3kW  2kW  100mph Speed Demon 
iTrader: (1)
Friends: (20)
Default

Originally Posted by pmullen503 View Post

BTW, Flysky V2 range check mode does nothing. The signal strength does NOT drop. That's why I was doing full power range checks with my DX6i as the control.

Wow, that is interesting.

If true, this thing will quickly show exactly what is going on.

http://www.wattflyer.com/forums/showthread.php?t=72719

DennyV
Retired and the days are just too short, busier than ever!
kyleservicetech is offline  
  Reply With Quote
Old 04-21-2014, 06:08 AM   #22
JetPlaneFlyer
Super Contributor
 
JetPlaneFlyer's Avatar
 
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 4,253
Thanked 471 Times in 439 Posts
Awards Showcase

5kW  Outstanding Contributor Award  1kW 
iTrader: (0)
Friends: (8)
Default

Originally Posted by Panther View Post
My FrSkys are 60 mW. I guess a techy guy could easily adjust it higher if need be. I haven't looked into it as the range is more than enough for my needs.
Yeah, i did hear that FrSky used lower power. this might be so they can be legal in France without change?
JetPlaneFlyer is offline  
  Reply With Quote
Old 04-21-2014, 06:13 AM   #23
JetPlaneFlyer
Super Contributor
 
JetPlaneFlyer's Avatar
 
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 4,253
Thanked 471 Times in 439 Posts
Awards Showcase

5kW  Outstanding Contributor Award  1kW 
iTrader: (0)
Friends: (8)
Default

Originally Posted by solentlife View Post
The matter of power is also subject to the format of the signal ... I cannot remember the exact description but I believe that Futaba chose the format that in fact is lower power than some others. It is not only Country related - but also how the signal format is that determines maximum legal power.
100mW is the maximum total 2.4GHz transmitting power (in the EU), regardless of signal protocol used. It's simply a measure of the radiated power from the antenna, signal coding makes no difference. The USA has a 200mW limit but many manufacturers for consistency sake stick with a lower limit for all of their transmitters.
FWIW Spektrum claim quite clearly that their wide band DSM produces greater range (up to 3x greater) than their competitors narrow band FHSS systems. I tend to take these claims from any manufacturer with a pinch of salt to be honest, unless I see some evidence.

The big reason wideband is so robust is coding gain. Essentially what this means is that the unique coding in a DSM2 or DSMX wideband signal allows it to be heard well above the noise of surrounding 2.4GHz signals without requiring any more power. In fact, a Spektrum wideband signal can achieve as much as 3X the range of its narrow-band competition using the same amount of power.
Source: https://www.spektrumrc.com/Technology/DSMX.aspx
JetPlaneFlyer is offline  
  Reply With Quote
Old 04-21-2014, 06:42 AM   #24
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,854
View solentlife's Gallery47
Thanked 225 Times in 222 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

Originally Posted by JetPlaneFlyer View Post
100mW is the maximum total 2.4GHz transmitting power (in the EU), regardless of signal protocol used. It's simply a measure of the radiated power from the antenna, signal coding makes no difference. The USA has a 200mW limit but many manufacturers for consistency sake stick with a lower limit for all of their transmitters.
FWIW Spektrum claim quite clearly that their wide band DSM produces greater range (up to 3x greater) than their competitors narrow band FHSS systems. I tend to take these claims from any manufacturer with a pinch of salt to be honest, unless I see some evidence.



Source: https://www.spektrumrc.com/Technology/DSMX.aspx
There actually is a different power limit based on format ... not only the overall total max you quote. I am trying to find the online review that quotes it ... it's our old 'friend' RC Model Reviews has it as well.. darned if I can find it now ... but it's there.


Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is online now  
  Reply With Quote
Old 04-21-2014, 06:47 AM   #25
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 5,854
View solentlife's Gallery47
Thanked 225 Times in 222 Posts
Club: Founder Member Ventspils RC Club. Ex Waltham Chase and Meon Valley Soaring.
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Outstanding Contributor Award  125mph Speed Demon 
iTrader: (0)
Friends: (15)
Default

Originally Posted by kyleservicetech View Post
For 2.4 Ghz, the actual distance your radio will work reliably during a "Range Test" of reduced transmitted power can easily be changed by altering the value of a resistor, or two. So, by a minor change in transmitter design of the range test circuitry, you could have a range test for 20 feet, 50 feet, or 500 feet, or what ever you want. For full power range, just about any decent 2.4 Ghz transmitter with a full range receiver will work reliably over a mile or three.

That's a lot different than the old 72 Mhz, (or 35 Mhz) radios. The range test on those transmitters simply involved collapsing the transmitter antenna. Since the antenna could only be made so small because of physical limits, the effective range was about 30 paces with the antenna down.
Yes ... yes .. yes ...

Funny thing is that JR used to advise against collapsed antenna use of the Tx - as the RF section could fail.

As to FlySky Range Check - that has been a known issue for a long time that the Range Check function of the Bind button was never implemented. It is a hang over in the manuals and Module labels from the FM module days of the original 9x.

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
- Subscribe my Youtube: "solentlifeuk"
solentlife is online now  
  Reply With Quote
Reply

  WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > General Electric Discussions

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Spektrum AR6115e Receiver Range Test kyleservicetech RC Radios, Transmitters, Receivers, Servos, gyros 5 08-12-2013 01:10 AM
Super Cub Range Check Problem Platinum350 General Electric Discussions 45 04-15-2013 08:40 PM
DX5e range test mode- what's a good distance? CNY_Dave Beginners 12 10-28-2011 03:52 AM
Range test, every flight? WVrailfan RC Radios, Transmitters, Receivers, Servos, gyros 14 10-04-2011 08:15 AM
Flite Test Videos: Appreciation Thread FlyingMonkey Off Topic Chit Chat 66 04-04-2011 04:58 AM


All times are GMT +1. The time now is 02:38 AM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 WattfFlyer.com
RCU Eflight HQ

Charities we support Select: Yorkie Rescue  ::  Crohn's & Colitis Foundation



Page generated in 0.61907 seconds with 71 queries