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I found the MB501 (MC12022, SP8704) but it is obsolete and cannot find a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

Hi,

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


Cheers - Joe

"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

"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

"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

"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

Hi,

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


Cheers - Joe

In , "Harry \(SM0VPO\)"
wrote:

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


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

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




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