Behold, Leon Heller signalled from keyed 4-1000A filament:

"Gregg" wrote in message
news:yfGwc.23554$DV4.9103@clgrps13...
Behold, Leon Heller signalled from keyed 4-1000A filament:

"Gregg" wrote in message
news:COwwc.24725$jl6.6833@edtnps89...
I'm building a SWRX with PLL frequency generator and need a 1/2
dozen of these chips. They are unobtanium from my Vancouver
suppliers.

I need the speed of AS or S because the master osc. will be 60-90
MHz.

I'd use a CPLD - it'll be faster, cheaper and take up less board
space. You can use it for the rest of the logic as well, including
the phase detector.

73, Leon

Hi Leon,

Thanks. But as a tubehead myself, how on earth do I go about doing
this?

You've got a lot of learning to do. 8-)

Try this web page of mine:

http://www.geocities.com/leon_heller/pld_starter.html

Leon

Thanks Leon! :-)

I'm a fast learner, you rock!

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Behold, R J Carpenter signalled from keyed 4-1000A filament:



"Gregg" wrote in message
news:COwwc.24725$jl6.6833@edtnps89...
I'm building a SWRX with PLL frequency generator and need a 1/2 dozen
of these chips. They are unobtanium from my Vancouver suppliers.

I need the speed of AS or S because the master osc. will be 60-90
MHz.

Have you considered the 74AC series? The 74ac74 will go well above 100
MHz. Prescale by 4 with these and then use slower presettable counters.

Or the 74HC/HCT4059 is guaranteed to do over 20 MHz and typically 50 MHz
and is a 16-bit presetable counter. Probably very hard to find these
days.

Thanks RJ,

Those chips *are* on my suppliers list :-)

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Behold, R J Carpenter signalled from keyed 4-1000A filament:



"Gregg" wrote in message
news:COwwc.24725$jl6.6833@edtnps89...
I'm building a SWRX with PLL frequency generator and need a 1/2 dozen
of these chips. They are unobtanium from my Vancouver suppliers.

I need the speed of AS or S because the master osc. will be 60-90
MHz.

Have you considered the 74AC series? The 74ac74 will go well above 100
MHz. Prescale by 4 with these and then use slower presettable counters.

Or the 74HC/HCT4059 is guaranteed to do over 20 MHz and typically 50 MHz
and is a 16-bit presetable counter. Probably very hard to find these
days.

Thanks RJ,

Those chips *are* on my suppliers list :-)

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Wow! I did not anticipare such a wonder ful response. Thank you very much
all.

I will take *all* of your advice actually - I will use the 74AC192 for the
divide-by-N counters and try my hand at PLD's for the PLL and peripheral
circuitry.

I run Linux and can program Perl blindfolded, so writing a programmer will
be no problem :-)

Again, many, many thanks!

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Wow! I did not anticipare such a wonder ful response. Thank you very much
all.

I will take *all* of your advice actually - I will use the 74AC192 for the
divide-by-N counters and try my hand at PLD's for the PLL and peripheral
circuitry.

I run Linux and can program Perl blindfolded, so writing a programmer will
be no problem :-)

Again, many, many thanks!

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca