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From: geoff@hls0.hls.oz (Geoff Bull)
Newsgroups: sci.electronics
Subject: Voltage Controlled Xtal Oscillator
Keywords: Oscillators VCO VCXO
Message-ID: <935@hls0.hls.oz>
Date: 24 Sep 90 21:07:20 GMT
Lines: 33


I want to build a 60 MHz VCXO.
Can I simply replace the capacitor on a MC1658 VCO with a capacitor
and crystal in series  (as shown below)?
                                              _
                                             | |
                             | |           | | | |
                         ----| |-----------| | | |---
			|    | |           | | | |   |
			|                    | |     |
			|                     -      |
			|                            |
			|                            |
			|                            |
			|                            |
               ------------------------------------------------
	       |        Cx                           Cx       |
	       |                                              |
	       |                                              |
	       |              Motorola MC1658                 |
	       |              Plessey SP1658                  |
	       |                                              |
	       |                                              |
	       |                                              |
               ------------------------------------------------

If this would work, why?                    Any better ideas?

-- 
Geoff Bull (Senior Engineer)	Phone  : (+61 48) 68 3490
Highland Logic Pty. Ltd.	Fax    : (+61 48) 68 3474
348-354 Argyle St		ACSnet : geoff@hls0.hls.oz.au
Moss Vale, 2577, AUSTRALIA