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Radio - JR & Spektrum DSM > How Many Frequencies
 
 
Dennis G
Senior Heliman
Location: ST LOUIS, MO

Does any one now how many different frequencies the Spektrum Radios can use. Another words can there be 1000 or more of these radios be on and flying at the same time.
Thanks

Freya evo, V-Blades, Wildcat Fuel Distributor
02-03-2007 Over year old.
 
 
midwestpilot
Elite Veteran
Location: Crystal Lake, IL

i believe..

the number is 80.... 80 can be on all at once..

In life there is no spacebar!

Rich Erikson AMA 6175
02-03-2007 Over year old.
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Dennis G
Senior Heliman
Location: ST LOUIS, MO

What happens when you exceed that number,like at IRCHA for instance. Would all the helis crash at ones or just a few.

Freya evo, V-Blades, Wildcat Fuel Distributor
02-03-2007 Over year old.
 
 
Al Austria
Key Veteran
Location: Gainesville, FL

Considering the fact that there are only 50 channels on the 72mhz band, logic tells me you'll never see more than 30 or 40 people flying at a given point at IRCHA or any big heli event for that matter.

Century Field Rep
Always remember you're unique, just like everyone else.
02-03-2007 Over year old.
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Peter Wales
Key Veteran
Location: Orlando Fl

There are 80 available frequencies but the DX series uses 2 of them so only 40 tx's can work at the same time. If #41 switches on, his Tx wont find a clear channel and so wont bind to the Rx and wont transmit.

Peter Wales
02-03-2007 Over year old.
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Rick_H
Key Veteran
Location: Boulder City, Nevada

Peter Wales is right and that is why we have not seen the end to the radio impound. Pilots will start to complain when they wait for a flight station and when they are up to fly their TX won't transmit because of to many radios turned on in the pits. Of course this is only going to happen at large events.

Rick
02-03-2007 Over year old.
 
 
Dennis G
Senior Heliman
Location: ST LOUIS, MO

IRCHA may be the true test of the Spektrum, maybe not this year or the next but years to come. When most pilots are flying the spektrum radios they will have to regulate how many pilots are flying by tags of some sort. There was over 500 pilots at IRCHA last year and a mile long flight line this can be a problem.

Freya evo, V-Blades, Wildcat Fuel Distributor
02-03-2007 Over year old.
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Quote 
There was over 500 pilots at IRCHA last year and a mile long flight line this can be a problem.

While there may be close to 500 regiestered pilots, many of those will never put a heli in the air during the entire event......

The "mile long" flight line is a bit of an exaggeration, don't you think ?? I have not been to an IRCHA event recently but I have attended many of the IRCHA events when they were held in Ohio.....

Does anyone know how many actual flight lines are operating at the current IRCHA event ??
02-03-2007 Over year old.
 
 
lperagallo
Senior Heliman
Location: Westfield, Indiana, USA

There is NO radio impound required for 2.4GHZ radios. AMA has adopted a rule that says that SS radios are NOT required in impound. Therefore flyers with a SS radio can do what they want. Since the technology manages the frequencies, there is protection from people on the same channel. Visit the Specktrum site and watch the videos. All is explained
02-04-2007 Over year old.
 
 
Peter Wales
Key Veteran
Location: Orlando Fl

That may very well be the case but I can see the point Dennis makes. Suppose 100 out of the 500 pilots at IRCHA are on DSS and 30 of them decide to turn their radios on to do some setup, knowing they cant interfere with anyone else. That will mean only 10 of the other 70 can fly, cos they wont get a channel. They may have waited for hours to get a spot to fly and then find they are locked out.

What do they do now? Turn on and wait for their system to lock in when someone else turns off and simply block a flying spot?

I think DSS radios at such a big event will still need to be impounded to stop too many guys setting up without using their DSC cords.

Peter Wales
02-04-2007 Over year old.
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Micro-Maniac
Elite Veteran
Location: Pasco,Washington Formerly: Captain Chaos

Actually the Spektrum systems can't utilize a DSC for setup - I expressed my disappointment in that with the DX6 when trying to get through a setup before the stock 600mah battery went dead and requested it be made possible with future models but seems so far that hasn't happened - Bigger battery instead.
02-04-2007 Over year old.
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Quote 
That will mean only 10 of the other 70 can fly, cos they wont get a channel.

Pete,

We can all hypothesize all day long but when you talk about reality, how many actual flight lines are there at the current IRCHA event ?? I asked the question above but no one has stepped up to the plate.

I recall from my Ircha days in Ohio, that there were about 10 or so TOTAL flight lines......

If the setup is similar in Muncie, then I don't see where there would be an issue at all....
02-04-2007 Over year old.
 
 
JuanRodriguez
Elite Veteran
Location: Rochester, New York

Quote 
My personal opinion is that the IRCHA Jamboree with 15-20 models in the air at the same time will be a pretty good test of all of this technology and many of us will feel much better about it after we see the results of a "crowded sky."

Quote taken from another thread.......

Answers my question and drives home the point that there IS no issue....IMHO....
02-06-2007 Over year old.
 
 
Gary Hoorn
Key Veteran
Location: Annapolis Maryland USA

If it develops into a problem at IRCHA or other large events the organizers will have to call for an impound. In the meantime some of these posts sound like "Chicken Little crying the sky is falling."
Gary
DX7 and loving it
02-07-2007 Over year old.
 
 
Ace Dude
Elite Veteran
Location: USA

I don't know guys, there's always quite a few guys working on their helis in the pits. With essentially 40 channels and 500 pilots it may be unlikely, but possible to run out of channels if everyone assumes they can turn on and work on their heli whenever they want.



02-07-2007 Over year old.
 
 
Micro-Maniac
Elite Veteran
Location: Pasco,Washington Formerly: Captain Chaos

And the lack of DSC capability somewhat further increases that likelihood as people have no choice but to broadcast/occupy channels during setup - So it would equally suck to have this non-collision technology yet still not be able to get in setup time at large events where even 72mhz'ers could setup all they want with their modules removed via DSC if allowed.
02-07-2007 Over year old.
 
 
Ace Dude
Elite Veteran
Location: USA

Quote 
If it develops into a problem at IRCHA or other large events the organizers will have to call for an impound. In the meantime some of these posts sound like "Chicken Little crying the sky is falling."

People don't plan to fail, they fail to plan. Nothing wrong with trying to understand the implications.



02-07-2007 Over year old.
 
 
oldboldpilot
Key Veteran
Location: Southern California

How many radios at a time?

FWIW, the combination of 80 things taken 2 at a time is 3160..

That is, if a radio is designed to use a random combination of any two freqs from a total of 80 available freqs, there are 3160 such combos available.

Helis are Man's Defiance of the Laws of Nature - OCHC
02-07-2007 Over year old.
 
 
Micro-Maniac
Elite Veteran
Location: Pasco,Washington Formerly: Captain Chaos

But each radio that is already on and occupying 2 of those channels for itself greatly reduces the number of combinations left and 40 radios on at once leaves zero combinations left for a 41st radio - It's still 2 channels out of 80 per radio = 40 radios total no matter how you look at it.
02-07-2007 Over year old.
 
 
jkelly
Veteran
Location: Mobile, AL

Well if all the channels are full then do what they already do and yell over the loud speaker telling someone to shut it down. If that don't work then fire the EMP cannon.
02-07-2007 Over year old.
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Radio - JR & Spektrum DSM > How Many Frequencies
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