[RCSE] JR TX and RX Crystals?

[Pat McCleave]

Hi Gang,

I have a question regarding JR TX  RX crystals.  It was pointed out to me
today after my  brother experienced some radio interferance which cost him
one plane (Sharon) and almost cost him his Stratos that JR crystals have a
series of dots on them that must be matched up in order to get maximum range
and selectivity from them.  What I was told is that if your TX crystal has
the left dot darkened then your RX crystal must also have the left dot
darkened.  This is the first time I have heard of this and have been flying
for quite some time now with unmatched dots.  I have not experienced any
kind of problems whatsoever with my current planes but after seeing the
Sharon go straight in today from 200 feet and shred through some trees it
has me very gun shy.  Could some of the JR experts on the list please shed
some light on this for me.  BTW, my brother had been flying his 8103 for
quite some time with the combination of crystals he has in it and had never
experienced a problem before.  I am finding it hard to believe that JR would
have such a system in place and not mention it in their manuals and also
wonder why just now things would show up a kill a plane.  My guess there was
more to his crash, ie switch failure, battery problem, bad module or
something of that sort than the dots not matching on the crystals.  Any help
in this matter would be greatly appreciated.

See ya,

Pat McCleave
Wichita, KS

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Re: [RCSE] JR TX and RX Crystals?

[YK Chan]

Did we made a ground range check?
Some Rx antenna input has DC path to chassis -ve, make a ohmic check
while wiggle the wire antenna.
Those do not possess DC path must open the back cover and direct
access the root tip at the chassis.
Use a tailor pin to poke through the PVC jacket for the copper strands
inside the wire antenna.
Did we check all connectors/wire junctions?
Unmatched dots is the last on the list to point my finger to.
Hope that helps.
YK Chan
Seattle

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