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I'm sure there will be those who will dispute this, but in my club there
is a very talented electronic guru who is a designer of sophisticated electronic
componentry, which is how he makes his living. One night, just to satisfy
his own curiousity, he took one of his trusty Futaba PPM receivers
and swapped between channel 11 and channel 59 which was stuff he was flying
at the time, and utilizing a spectrum analyzer was unable to produce any
variation in signal strength across the entire band. The conclusion he
drew was that the manufacturer just mass produces these receivers en-masse
and stuffs them with crystals according to the system being packaged.These
were probably 127- DF units and relative to the hi-end stuff we fly, there
may be a different approach to our equipment. Tony would probably be able
to elaborate further.This is just info he thought worthy of sharing.
<br>Georgie
<p>Harry Slone wrote:
<blockquote TYPE=CITE><style></style>
<font face="Arial"><font size=-1>Thanks,
all. This hobby dealer first puts the receiver down on the counter....and
then says "What crystal do you need?". I'd better talk to him.
Though, I've never had range problems.</font></font><font face="Arial"><font size=-1>Harry..</font></font>
<blockquote
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<div style="FONT: 10pt arial">----- Original Message -----</div>
<div
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><b>From:</b>
<a href="mailto:s.vannostrand@kodak.com" title="s.vannostrand@kodak.com">s.vannostrand@kodak.com</a></div>
<div style="FONT: 10pt arial"><b>To:</b> <a href="mailto:discussion@nsrca.org" title="discussion@nsrca.org">discussion@nsrca.org</a></div>
<div style="FONT: 10pt arial"><b>Sent:</b> Thursday, December 12, 2002
3:13 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re: Crystals</div>
<p><br><font face="sans-serif"><font size=-1>No problem. THe differences
are in the receivers, not the crystals. Just be sure you know if
your reeiver is low or high band, then just buy the crystal a channel that
the receiver will work with.</font></font>
<p><font face="sans-serif"><font size=-1>--Lance</font></font>
<br><font face="Times New Roman"><font size=+0> </font></font><font face="Comic Sans MS"><font size=-1>Forgive
my ignorance.... My local hobby store sells receivers, PPM, and separately
sells crystals for them. Might be channel 6..or 60. Could this
be a problem?</font></font>
<p><font face="Comic Sans MS"><font size=-1>Harry..</font></font>
<p><font face="Times New Roman"><font size=+0> ----- Original Message
-----</font></font>
<p><font face="Times New Roman"><font size=+0><b>From:</b> s.vannostrand@kodak.com</font></font>
<p><font face="Times New Roman"><font size=+0><b>To:</b> discussion@nsrca.org</font></font>
<p><font face="Times New Roman"><font size=+0><b>Sent:</b> Thursday, December
12, 2002 1:59 PM</font></font>
<p><font face="Times New Roman"><font size=+0><b>Subject:</b> Re: Crystals</font></font>
<br>
<br>
<p><font face="sans"><font size=-1>Tony S can give you the tech detail,
but receivers are tuned circuits. The crystal is key to creating
the reference frequency used to filter the signal picked up on the antenna.
The crystal sets up the basic reference frequency and the circuitry around
it can only be used for a narrow range, or band, of frequencies.
The futaba receivers come in two types that have components that tune each
to a different band. You can put a low freq crystal in a high band
receiver, but you'll have a detuned system, reduced range, and possible
signal lock loss. I wouldn't do it.</font></font>
<p><font face="sans"><font size=-1>--Lance</font></font></blockquote>
</blockquote>
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