Crystals wanted
 

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

Crystals wanted
 

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?

Crystals wanted
 

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

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.

Crystals wanted
 

Ken Scharf wrote:

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.

Since they are low order odd harmonics, is a PLL even necessary, or
could a square wave sort of buffer, a filter at the desired frequency
and then an amplifier tuned there do the trick?

With a PLL, you will still need to switch components for each frequency
range - generally you get less than an octave (factor of two in
frequency) out of a single VCO, but changing the inductor and/or fixed
capacitors for each band shouldn't be too hard.