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HelicopterMain Discussion › PPM on my evo 90?
11-26-2007 09:48 PM  9 years agoPost 1
Cope

rrVeteran

South Lake Tahoe CA

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Is it ok to fly my evo 90 on ppm? I have heard that know one flys 90's on ppm is this true? Man I know these are $ pits but really, do I need spcm or 2.4 gig? This thing is eating me out of house and home
Thanks for the advice
Cope

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11-26-2007 09:59 PM  9 years agoPost 2
Pistol Pete

rrProfessor

Seffner, FL

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Given the initial investment of a .90...

how much more to go ppm or even 2.4g?

also known as...peace of mind.

~~Enjoying the hobby one flight at a time~~

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11-26-2007 10:12 PM  9 years agoPost 3
Cope

rrVeteran

South Lake Tahoe CA

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Hi
I'm flying PPM now, I was told that spcm or 2.4 is much better?
My TX is a xp6102 w/a R700 RX Is this no good?

I looked at the C.C. RX that you mentioned before and am still thinking about getting it, when $ becomes a little less of a concern. (Times is tight)
Thanks for the input
Cope

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11-26-2007 10:12 PM  9 years agoPost 4
payne1967

rrElite Veteran

uk

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if you use ppm just fit an after market fail safe
my bell 47 gasser was on ppm with an after market fail safe on the pitch and throttle and yes they did save the model when the rx failed
now its on pcm and that what i now fit to all my models

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11-26-2007 11:30 PM  9 years agoPost 5
Cope

rrVeteran

South Lake Tahoe CA

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So what I have is no good, just cuz theres no fail safe?

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11-27-2007 12:00 AM  9 years agoPost 6
allns47

rrKey Veteran

Richmond IN.

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You can fly it with what you got..PPM will be fine..

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11-27-2007 02:12 AM  9 years agoPost 7
mbfjr

rrApprentice

Lawrenceville, Georgia

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With all the folks jumping over to 2.4ghz now is a great time to get a used 770 SPCM receiver....watch the classifieds, you can get them dirt cheap....saw one go for $40....It would be well worth it.

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11-27-2007 02:31 AM  9 years agoPost 8
spog

rrVeteran

Ontario, Canada

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I don't think I'd trust a used Rx, those things suffer vibration and crash damage and it's not detectable by just looking at it or even a range check.

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11-27-2007 03:30 AM  9 years agoPost 9
Zaneman007

rrElite Veteran

Texas - USA

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I wouldn't fly ppm. It can pick up noise. It's called pulse position modulation. It is an analog signal. PCM is pulse code modulation. It uses ones and zeros. Helis can produce high frequency noise. This is more common on electric than nitro helis. I saw this on my 450, once. That is all it took, I switched to PCM, never looked back.

Old Guys Rule!

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11-27-2007 09:04 PM  9 years agoPost 10
Captain Crazy

rrApprentice

Wakefield, England

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I have just gone 2.4 from PPM due to glitches on my Trex600, i always had a small glitch occasionally with my raptor30 but noticed alot more in my rex so bit the 2.4 bullet.aids peace of mind for me.

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11-27-2007 09:18 PM  9 years agoPost 11
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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You have less of chance of interference with pcm. pcm looks like this -_-_-_-and ppm looks like this---___---___---____ the gaps are bigger on band with ppm plus you have fail safe on pcm this is how I understood the difference you might get a more technical reply but I got the point this way I fly 2.4 now

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11-28-2007 12:09 AM  9 years agoPost 12
dialarotor

rrElite Veteran

Traverse City, Michigan

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PPM is fine on the plastic fantastic models, shuttles, calibers, raptors, small evos. When you get to the birds with metal side frames, carbon booms and boom supports, like the big EVO, Stinger 90,JR Vibes, all the older type models Helistars, GMP's it gets dicey. The birds with lots of metal and carbon parts can have a loose bolt or screw setting up a vibration that turns into an interference problem for the PPM (FM) receivers. PCM was suppose to be the big salvation for this back in the early 90's, but the same interference when bad enough would send the PCM receivers into "lockout" or "failsafe". The JR Vigor and Vibe are famous for this type of annoying and hard to find interference. If you build it tight and have no vibration, PCM is fine, thankfully 2.4ghz rejects all this noise, chattering booms, boom supports, and even notchy engine and main shaft bearings. JMHO

RapRexSynLog Pilot

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