Hi Perry,
 Simon responded to you very well. there are some other things that can cause
problems with your receiver such as a bad crystal. This can happen from a hard landing.
 The plane may look OK and fly Ok but the crystal may stop ocillating and cause a crash
as these crystals are fragil. Also flying near high voltage power lines can cause noise
which will swamp your receiver with noise so your receiver can't hear the desired 
signal.
power poles in the area with transformers can be a source of noise if not properly 
grounded.
Drive around intersections with power lines over them while listening to your AM radio
and you will hear what I mean.
Thermals, Art

Perry Hudson wrote:

> Ok,
> Sitting here on the couch doing some testing my Jr PCM channel 32 will no hit
> my  Jr PPM channel 32 sitting right next to each other.
>
> My Futaba PPM will not hit my Jr PPM channel 20 sitting right next to each other
> . I guess it's the neg pos shift thing?
>
> My buddy has a Stylus I think  that will talk to either pos or neg ,ppm or pcm
> receivers  without re programming the radio.  If this is correct it injects
> a whole set of numbers into the shot down  analysis spread sheet to calculate
> the odds.
>
> 50 frequencies
> 8 I think on 6 meters
> PPM
> PCM
> Negative Shift
> Positive Shift
>
> So, in order to get shot down, some one would have to be on your channel, with
> your shift, in your mode PPM,PCM.  Or have a Stylus on your channel.  Is this
> right or am I in left field.
>
> Regards,Perry
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