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HomeAircraftHelicopterMain Discussion › Who still uses fm?
04-10-2010 01:09 AM  8 years agoPost 21
Yug

rrMaster

UK. Herts

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Everything is FM (frequency modulation) nowdays (apart from the world service) because it is more reliable to demodulate an FM signal than an AM signal, however this is splitting hairs given that nowdays, in an age where ignorance runs rife in favour of 'buzz words', most folk seem to associate FM to the older PCM/PPM systems and SS to our 2.4GHz systems. A few decades ago, some systems did use AM to encode PPM. The 2.4GHz systems use frequency hopping techniques utilising basic frequency modulation. ie, technologies developed primarily for WiFi and Mobile comms.

Vegetable rights and Peace

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04-10-2010 01:09 AM  8 years agoPost 22
DougsRC

rrProfessor

Mass.

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I used 72 mHZ for years with planks and then with heli's with no problems at all. Then was givin a 2.4 gHZ TX for my birthday and used it with no problems. Bought a RTF heli with a 72 mHZ stock TX radio and am currently using it with no problems with interference. So yes, I am using FM or 72mHZ or whatever the definition is and it seems to work pretty good, still Shocking, I know

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04-10-2010 01:24 AM  8 years agoPost 23
tadawson

rrElite Veteran

Lewisville, TX

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Everything is FM (frequency modulation) nowdays (apart from the world service)
Interestingly, the current standard for aircraft communications and navigation (VOR, etc) is still fully AM in the 120MHz range . . . the reason, I believe, is a combination of historical reasons, and the fact that AM tends to be usable at greater ranges than FM . . . but you will get more background noise.

- Tim

Friends don't let friends become electrotarded . . . .

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04-10-2010 02:19 AM  8 years agoPost 24
Bouchah

rrKey Veteran

Willow Spring, N. Carolina USA

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I thought about upgrading this season but chose to buy a new 50 size heli. A new radio will probably be my big investment into the hobby next season. Came close to 9503 but not sure of Spectrum technology, thought about the Futaba 8FG, just dont care for the way it looks, so I went with the Heli. Hirobo SDX

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04-10-2010 03:02 AM  8 years agoPost 25
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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I'm still not 100 percent comfortable wrapping a 921 in carbon kevlar and sending it to the edge of where I can see it.
Agreed. I also use 72 mHz on birds with 2.4 gHz FPV downlinks. Less image interference, and no chance of tx/rx interference from the downlink.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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04-10-2010 04:33 AM  8 years agoPost 26
Mighty Mouse

rrApprentice

Deep South

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I've found using a older FM radio with a after market module/receiver in the 2.4GHz band you have the best value for the buck. The Chinese have come a long way in making inexpensive decent combos with FHSS and fail safe. I used to us ASSAN module, but not am using a FLY DREAM module. $39 bucks for a module and receiver cant be beat. Receivers are only $20 or so.

Here I come to save the day !!!

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04-12-2010 01:36 PM  8 years agoPost 27
TachyonDriver

rrKey Veteran

Chipping, Lancs, UK

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I still use 35MHz (FM) PPM for my KDS450s and 35MHz PCM for my Raptor 30, both flown from my Futaba 9C (not both at the same time though! ). Only recently switched to a Futaba 9C from the trusty Field Force 7 which came with my secondhand Raptor. The KDS 450 came with its own Tx, but after I'd retired the FF7 to simulator duty, I use the FF7's 35MHz module in the back of the 9C and the PCM module for the Raptor.

Tach.

Little Spinning Bundle of Joy® DON'T DISS THE DINO!!

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04-12-2010 01:45 PM  8 years agoPost 28
Mutt

rrKey Veteran

M ca usa

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I still use my 72mhz radios and will always use them no need to replace items that work perfect.

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04-12-2010 02:00 PM  8 years agoPost 29
Mighty Mouse

rrApprentice

Deep South

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I still have Many FM receivers/transmitters and starting to phase them out. But they work really well. One of the biggest advantage I see is not having to be concerned about whos flying what channel. No more frequency boards....

Here I come to save the day !!!

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04-12-2010 09:27 PM  8 years agoPost 30
Gearhead

rrMaster

Vt

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PPM,,
I flew Helis on PPM for 7 years and I only had 3 glitching problems, and they were do to 2 loose Screws and 1 bad Plug,,,, ooops, that bad Plug was with PCM, so that brings it down to 2 glitching problems with PPM in 7 years, and they were not really problems, just a bitty glitch while hovering, just set her down and tighten the Screws and fly, I now fly my Helis on PCM just because over the last few years I bought a couple PCM Channel Select Receivers to go with my Channel Select Tx..

Jim
Buzz Buzz Buzz

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HomeAircraftHelicopterMain Discussion › Who still uses fm?
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