"Joe McElvenney" wrote in message
...
Hi,

Mouser have some NEC pre-scalers (3GHz max) for $2.92 a throw.


Any idea of the NEC part number ?

Thanks

Hi,

They are listed at -

http://www.mouser.com/catalog/615/217.pdf

and NEC have a data sheet on-line if you do a quick Google.

I should point out that they are really only simple dividers
with none of the front-end bits necessary to make a complete
prescaler. I was thinking of using one with an old Racal 1991 VHF
counter that has the built-in maths capability required to enable
a non-decade pre-division.


Cheers - Joe

Hi,

They are listed at -

http://www.mouser.com/catalog/615/217.pdf

and NEC have a data sheet on-line if you do a quick Google.

I should point out that they are really only simple dividers
with none of the front-end bits necessary to make a complete
prescaler. I was thinking of using one with an old Racal 1991 VHF
counter that has the built-in maths capability required to enable
a non-decade pre-division.


Cheers - Joe

I have thought about using one of the modern SM PLL chips such as the
National LMX2326 which can be progammed to give any division over a wide
range (you do need a controller though to drive it) - you can access the
main divider output directly and ignore the phase divider. These are widely
available and pretty cheap. I would think you could do one one these "dead
bug" with care, though they are SSOP. Of course if you are doing a PLL, why
not use the whole chip?

Richard

Harry (SM0VPO) wrote in message
...
Hi all,
I am having a spot of bother with prescaler chips. Basically I need to
find
one at the right price and availability. US$5 each is reasonable, but
where
from? Is there one available that is not obsolete?

I live in Sweden and my local component shop is ELFA (Swedens answer to
RS).
They don't sell ANY digital divider that operates above 50MHz, except for
the 74F163 and I cannot come up with a reliable interface circuit to
couple
an oscillator into it at over 100MHz.

I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a
reliable source. I bought a couple, but that source dried up. All I need
is
a divider chip that will accept a small signal up to 150MHz, is available,
cheap(ish) and will divide down to under 10MHz so that I can use CMOS to
process a synthesiser. A parallel-load synthesiser chip with in-built
150MHz
prescaler would do.

I have used "Teleport" to download over 50,000 pdf datasheets without any
luck. I have gone through most of them, but it takes a fair bit of time.
If
anyone has a helpful suggestion I would appreciate it.

BR from Harry - SM0VPO

http://w1.859.telia.com/~u85920178/
harryvpo (at) hotmail (dot) com

I have thought about using one of the modern SM PLL chips such as the
National LMX2326 which can be progammed to give any division over a wide
range (you do need a controller though to drive it) - you can access the
main divider output directly and ignore the phase divider. These are widely
available and pretty cheap. I would think you could do one one these "dead
bug" with care, though they are SSOP. Of course if you are doing a PLL, why
not use the whole chip?

Richard

Harry (SM0VPO) wrote in message
...
Hi all,
I am having a spot of bother with prescaler chips. Basically I need to
find
one at the right price and availability. US$5 each is reasonable, but
where
from? Is there one available that is not obsolete?

I live in Sweden and my local component shop is ELFA (Swedens answer to
RS).
They don't sell ANY digital divider that operates above 50MHz, except for
the 74F163 and I cannot come up with a reliable interface circuit to
couple
an oscillator into it at over 100MHz.

I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a
reliable source. I bought a couple, but that source dried up. All I need
is
a divider chip that will accept a small signal up to 150MHz, is available,
cheap(ish) and will divide down to under 10MHz so that I can use CMOS to
process a synthesiser. A parallel-load synthesiser chip with in-built
150MHz
prescaler would do.

I have used "Teleport" to download over 50,000 pdf datasheets without any
luck. I have gone through most of them, but it takes a fair bit of time.
If
anyone has a helpful suggestion I would appreciate it.

BR from Harry - SM0VPO

http://w1.859.telia.com/~u85920178/
harryvpo (at) hotmail (dot) com

Frank Gilliland wrote
Man, if THIS ain't a trip -- a well-known, over-rated internet homebrew
tech
asking for help for a simple prescaler.

And why not? I am the first to admit lack of experience any a field. You
should not be afraid to ask, either. You learn a lot more than you do when
you simply site there and ridicule people.

... over-rated ...

??? See what I mean ??? Superfluous words conveying no meaning, other than
displaying emotions that one would hide in public to avoid embarrasment.

Hey Harry, don't you know that the basic
freshman-lab-grade Class B or C amplifier is nothing more than a
divide-by-2
counter? If you have a bunch of 2N2222's, 2N2907's, or any transistor with
an Ft
above your high-freq limit, you have a divide-by-(n x 2) counter. Any
advanced
homebrewer should know that stuff cause it's basic theory.

Not available in Sweden, just the usual 300MHz unity-gain (BC547, 557, etc),
and the circuit stops operating at about 100MHz when the gain/pcb has become
useless. I need RF transistors that are not available. ELFA only have no RF
small signal devices.

And for you to post such a question in alt.radio.pirate.... that's pretty
pathetic, Harry.

I was a pirate myself, LONG before I became an amateur. I have a lot of
respect for the knowledge and experience of some of these so-called
"pirates". I wonder how just many "pirates" you have spoken to on the HF
bands? Certainly more than 0 and you were not even aware of it.

Very best regards from Harry
( Writing from home this time )
harryvpo (at) hotmail (dot) com

Frank Gilliland wrote
Man, if THIS ain't a trip -- a well-known, over-rated internet homebrew
tech
asking for help for a simple prescaler.

And why not? I am the first to admit lack of experience any a field. You
should not be afraid to ask, either. You learn a lot more than you do when
you simply site there and ridicule people.

... over-rated ...

??? See what I mean ??? Superfluous words conveying no meaning, other than
displaying emotions that one would hide in public to avoid embarrasment.

Hey Harry, don't you know that the basic
freshman-lab-grade Class B or C amplifier is nothing more than a
divide-by-2
counter? If you have a bunch of 2N2222's, 2N2907's, or any transistor with
an Ft
above your high-freq limit, you have a divide-by-(n x 2) counter. Any
advanced
homebrewer should know that stuff cause it's basic theory.

Not available in Sweden, just the usual 300MHz unity-gain (BC547, 557, etc),
and the circuit stops operating at about 100MHz when the gain/pcb has become
useless. I need RF transistors that are not available. ELFA only have no RF
small signal devices.

And for you to post such a question in alt.radio.pirate.... that's pretty
pathetic, Harry.

I was a pirate myself, LONG before I became an amateur. I have a lot of
respect for the knowledge and experience of some of these so-called
"pirates". I wonder how just many "pirates" you have spoken to on the HF
bands? Certainly more than 0 and you were not even aware of it.

Very best regards from Harry
( Writing from home this time )
harryvpo (at) hotmail (dot) com

what frequency steps are you looking for harry????
if its for the broadcast band then the philips range of tsa5511/12/14 are
cheap and have upper operating range of 1300mhz, only trouble with them is
50khz steps..pic codes available on the net...otherwise the mc 145170 is a
good choice, operates up to 170mhz..but is serial controlled as well....
g0zen simon
"Richard Hosking" wrote in message
. au...
I have thought about using one of the modern SM PLL chips such as the
National LMX2326 which can be progammed to give any division over a wide
range (you do need a controller though to drive it) - you can access the
main divider output directly and ignore the phase divider. These are
widely
available and pretty cheap. I would think you could do one one these "dead
bug" with care, though they are SSOP. Of course if you are doing a PLL,
why
not use the whole chip?

Richard

Harry (SM0VPO) wrote in message
...
Hi all,
I am having a spot of bother with prescaler chips. Basically I need to
find
one at the right price and availability. US$5 each is reasonable, but
where
from? Is there one available that is not obsolete?

I live in Sweden and my local component shop is ELFA (Swedens answer to
RS).
They don't sell ANY digital divider that operates above 50MHz, except
for
the 74F163 and I cannot come up with a reliable interface circuit to
couple
an oscillator into it at over 100MHz.

I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a
reliable source. I bought a couple, but that source dried up. All I need
is
a divider chip that will accept a small signal up to 150MHz, is
available,
cheap(ish) and will divide down to under 10MHz so that I can use CMOS to
process a synthesiser. A parallel-load synthesiser chip with in-built
150MHz
prescaler would do.

I have used "Teleport" to download over 50,000 pdf datasheets without
any
luck. I have gone through most of them, but it takes a fair bit of time.
If
anyone has a helpful suggestion I would appreciate it.

BR from Harry - SM0VPO

http://w1.859.telia.com/~u85920178/
harryvpo (at) hotmail (dot) com

what frequency steps are you looking for harry????
if its for the broadcast band then the philips range of tsa5511/12/14 are
cheap and have upper operating range of 1300mhz, only trouble with them is
50khz steps..pic codes available on the net...otherwise the mc 145170 is a
good choice, operates up to 170mhz..but is serial controlled as well....
g0zen simon
"Richard Hosking" wrote in message
. au...
I have thought about using one of the modern SM PLL chips such as the
National LMX2326 which can be progammed to give any division over a wide
range (you do need a controller though to drive it) - you can access the
main divider output directly and ignore the phase divider. These are
widely
available and pretty cheap. I would think you could do one one these "dead
bug" with care, though they are SSOP. Of course if you are doing a PLL,
why
not use the whole chip?

Richard

Harry (SM0VPO) wrote in message
...
Hi all,
I am having a spot of bother with prescaler chips. Basically I need to
find
one at the right price and availability. US$5 each is reasonable, but
where
from? Is there one available that is not obsolete?

I live in Sweden and my local component shop is ELFA (Swedens answer to
RS).
They don't sell ANY digital divider that operates above 50MHz, except
for
the 74F163 and I cannot come up with a reliable interface circuit to
couple
an oscillator into it at over 100MHz.

I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a
reliable source. I bought a couple, but that source dried up. All I need
is
a divider chip that will accept a small signal up to 150MHz, is
available,
cheap(ish) and will divide down to under 10MHz so that I can use CMOS to
process a synthesiser. A parallel-load synthesiser chip with in-built
150MHz
prescaler would do.

I have used "Teleport" to download over 50,000 pdf datasheets without
any
luck. I have gone through most of them, but it takes a fair bit of time.
If
anyone has a helpful suggestion I would appreciate it.

BR from Harry - SM0VPO

http://w1.859.telia.com/~u85920178/
harryvpo (at) hotmail (dot) com

"Joe McElvenney" wrote in message
...
Hi,
Mouser have some NEC pre-scalers (3GHz max) for $2.92 a throw.
Cheers - Joe

Hi Joe,
Many thanks for the information. You have been a great help; exactly what I
was alooking for. I keep having trouble buying this sort of specialised RF
component.

Mant thanks again for your help. BR Harry