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#4
February 25th 06, 03:42 AM
posted to rec.radio.amateur.homebrew
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Crystals wanted
Gary Schafer wrote:
On Thu, 23 Feb 2006 21:51:09 -0500, Ken Scharf wrote: Gary Schafer wrote: I have a homebrew project that I need some crystals for. Need the following: 3.300 mhz 3.500 mhz 10.5 mhz 17.5 mhz 24.5 mhz Prefer HC6 holders if you have them. Any help out there? Thanks! Gary K4FMX Please reply to Building a 2B clone eh? Kind of. It is a converter for a BC453 (Q5er) that I built many years ago. It now uses only one 3.5 Mhz crystal, dual conversion, for all bands. Trying to clean up some of the image problems. 73 Gary K4FMX Since all the frequencies in question are harmonics of 3.5mhz (except 3.3mhz) you could use a PLL to generate them by phase locking a vco to the harmonics of a 3.5mhz oscillator. Use a divide by N circuit to divide down the vco output to 3.5mhz and have a phase detector compare the output of the divider with the 3.5mhz oscillator. Properly shielded, this pll would be as clean as the crystal oscillator. |
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