Is there rally an advantage in using 2048 over 1024 transmitters/receivers..........i read somewhere that it didnt make a difference because no servo exists that can actually utilize 2048 ........kinda similar to when local cell phone dealers would sell a4G phone, when in reality only 3g is available here locally

ummmmm for sports flyers.....no.....if you are buying 150$$ hitec 7955 maybe???? http://www3.towerhobbies.com/cgi-bin...?&I=LXTHR3&P=0 these things are awsome btw.....expensive but awsome

Actually, we dont even have 3G

I have several fellow fliers (including me) who are still using 72MHZ PCM and a couple that are even using the archaic AM TX with no problems. As always, if it ain't broken (or about to break), dont fix it.

Ameyam

Depends on what you're doing. 6v, high speed digitals, on a responsive helicopter or a 3D plane maybe a slight difference.

Most of the rest of the stuff, no.

If you do the math and work it out over the servo throw its a pretty small difference in practice.

To answer your question in the easiest way is that yes you can tell a difference between the two. In fact, on the Airtronics SD-10G radio if you are using the recievers that have 2048 resolution on them you have to use digital servos because older analog servos simply cannot keep up with the receiver, and you can actually see the servos "stutter" a bit depending on the movements that you are giving them.

So, does this matter to the end user? This is something that you have to evaluate for yourself. It boils down to does your type of flying benefit from the new precision you will get with the improved capabilities? And more important is it worth the extra money for the more expensive receivers (in the case of the Airtronics) and digital servos? Look at it this way, a Indy race team will spend hundreds of thousands of dollars to gain just a few fractions of a second in increased speed. This is worth it to them because it can make the difference between winning and losing. But for the average everyday driver going to work there is no way they would spend the money because they would never see the difference. Since we are in the context of the Beginner's forum I would safely bet that most people here would never see the improvements this would give them.

Hope this helps

Ken

Actually the resolution has nothing to do with the problems described when using analog servos. It is only a description of the size of step that the transmitter makes as it creates the pulse width that goes to each servo. The SD-10G pulses vary from 0.9 to 2.1 mS (there are 1000 mS to each second) which is pretty much in the range that all servos have used since Doug Spreng came up with the concept in the early '60's. Analog or digital, it doesn't matter to the servo how finely the width of the pulse is divided.

What is going on is the frame rate of some of the faster 2.4 radios is much faster than the frame rate that was used by traditional radios. Earlier radios would send new information to a servo about 40 times a second. This works out to be around 25 mS, so most analog servos are set up with a circuit that is timed to work with that repetition rate of pulses to the servo. If the pulse width information starts coming to the more frequently, then the pulse stretching circuit never completely discharges and you get the buzzing, humming, jumping problem. It was this pulse stretching circuit that allowed the servo to have any torque at all, and is the part of the servo that changed the most when going to a digital servo.

Some of the extremely fast systems now can update the information at 11 mS at the full 2048 resolution (this is only possible with the wide bandwidth available at 2.4G), but also offer the option of slowing the frame rate down to a slower speed so as to work with analog servos. I don't know if all manufacturers have this feature now, but it works quite well if your fleet of models have both types of servos.

Gee, I remember the "good old days" when everything was 512. Dennis

its still the "good old days" for my glow planes, im still using a couple of PCMZ(512) receivers....they dont know the difference.