RF frequency divider

[[email protected]]

Hi,

I need to take a 66Mhz square wave off a 50 ohm feed and divide its
frequency down to somwhere below 20Mhz, so say by a factor of 4. Does
anyone have any idea where I might be able to purchase a frequency
divider (say one 4, or two 2's) that will operate in this setting.
Ideally it would be great to find a boxed up component that has SMA
connectors, given my time constraints. I can't use a mixer in my
setting given that I won't have a reference signal, so a divider is a
must. I've tried mini-circuits and googled to the max so any ideas
would be greatly appreciated. Thanks,

Kevin

 

[petrus bitbyter]

Hi,

I need to take a 66Mhz square wave off a 50 ohm feed and divide its
frequency down to somwhere below 20Mhz, so say by a factor of 4. Does
anyone have any idea where I might be able to purchase a frequency
divider (say one 4, or two 2's) that will operate in this setting.
Ideally it would be great to find a boxed up component that has SMA
connectors, given my time constraints. I can't use a mixer in my
setting given that I won't have a reference signal, so a divider is a
must. I've tried mini-circuits and googled to the max so any ideas
would be greatly appreciated. Thanks,

Kevin

Kevin,

A 74HC74 will do the trick. Two D-type flip-flops with a maximum clock
frequency of 76MHz. (According to Philips datasheet.)

petrus bitbyter

 

[[email protected]]

Hi,

I need to take a 66Mhz square wave off a 50 ohm feed and divide its
frequency down to somwhere below 20Mhz, so say by a factor of 4. Does
anyone have any idea where I might be able to purchase a frequency
divider (say one 4, or two 2's) that will operate in this setting.
Ideally it would be great to find a boxed up component that has SMA
connectors, given my time constraints. I can't use a mixer in my
setting given that I won't have a reference signal, so a divider is a
must. I've tried mini-circuits and googled to the max so any ideas
would be greatly appreciated. Thanks,

Kevin

What amplitude signals are you working with? Do you need 50 ohms out as
well?

 

[Ancient_Hacker]

A little spendy, but ready to go:

http://tinyurl.com/mqj5d


What voltage level is the signal? If it's less than a few volts p-p,
you'll need a little amplifier to get it up to logic levels, and that
can get tricky.

 

[Phil Allison]

<[email protected]

Hi,

I need to take a 66Mhz square wave off a 50 ohm feed and divide its
frequency down to somwhere below 20Mhz, so say by a factor of 4. Does
anyone have any idea where I might be able to purchase a frequency
divider (say one 4, or two 2's) that will operate in this setting.
Ideally it would be great to find a boxed up component that has SMA
connectors, given my time constraints. I can't use a mixer in my
setting given that I won't have a reference signal, so a divider is a
must. I've tried mini-circuits and googled to the max so any ideas
would be greatly appreciated. Thanks,

** You need an " ECL prescaler".

http://www.google.com.au/search?hl=en&q=ecl+prescaler+&btnG=Google+Search&meta=


Beware - these may or may not produce a square wave output.





........ Phil

 

[[email protected]]

A little spendy, but ready to go:

http://tinyurl.com/mqj5d


What voltage level is the signal? If it's less than a few volts p-p,
you'll need a little amplifier to get it up to logic levels, and that
can get tricky.

This would be perfect if it was more around the $100 range. So in
response to all the input again is 66Mhz 50 ohms, but for the output I
just need to meet TTL specs for the high and low voltages, so an SMA
box that has 50 ohm output like the above suggestion, but more
streamlined and cheaper would be the best. But this may be too
optimistic of a hope.......

 

[Phil Allison]

** BEWARE: Major Groper Alert !!!!!!!

Waaaaaaaaaaarrrrrrrrrhhhhhhhhheeeeeerrrrrrrhhhhhhhh .......

This would be perfect if it was more around the $100 range. So in
response to all the input again is 66Mhz 50 ohms,

** Hey, Big Kev the FUCKWIT !!!!!!!!!!!!

Do you EVEN have the slightest DAMN clue what VOLTAGE is ?????

but for the output I
just need to meet TTL specs for the high and low voltages,

** See my post re: "ECL prescaler" at all - Kev ????????

Or too damn busy WANKING yourself blind in public ????

so an SMA
box that has 50 ohm output like the above suggestion, but more
streamlined and cheaper would be the best. But this may be too
optimistic of a hope.......

** There is a very important distinction between "optimism" and a rabid
case of "narcissism".

Shame you have no clue about that either - Big Kev.



....... Phil

 

[[email protected]]

** BEWARE: Major Groper Alert !!!!!!!

Waaaaaaaaaaarrrrrrrrrhhhhhhhhheeeeeerrrrrrrhhhhhhhh .......





** Hey, Big Kev the FUCKWIT !!!!!!!!!!!!

Do you EVEN have the slightest DAMN clue what VOLTAGE is ?????





** See my post re: "ECL prescaler" at all - Kev ????????

Or too damn busy WANKING yourself blind in public ????






** There is a very important distinction between "optimism" and a rabid
case of "narcissism".

Shame you have no clue about that either - Big Kev.



....... Phil

My friend as I stated before I don't want a chip. I was hoping someone
might know of a vendor that sells sma boxed 50 ohm dividers that are in
the $100 range that meet my 66Mhz spec. I'm sorry you haven't been
layed of recent. Enjoy your time on the web today.

 

[Phil Allison]

** BEWARE: Major Groper Alert !!!!!!!

Waaaaaaaaaaarrrrrrrrrhhhhhhhhheeeeeerrrrrrrhhhhhhhh .......

My friend as I stated before I don't want a chip.

** Shame you are not up to eating fish either.

I was hoping someone
might know of a vendor that sells sma boxed 50 ohm dividers that are in
the $100 range that meet my 66Mhz spec.

** Shame you never supplied us any FUCKING spec - you posturing ****.


GO TO HELL !!!!




........... Phil

 

[petrus bitbyter]

This would be perfect if it was more around the $100 range. So in
response to all the input again is 66Mhz 50 ohms, but for the output I
just need to meet TTL specs for the high and low voltages, so an SMA
box that has 50 ohm output like the above suggestion, but more
streamlined and cheaper would be the best. But this may be too
optimistic of a hope.......

Especially if you have a 10mVpp level. Even the PRL-255CN requires 2V.
Apparently you're either a newbie or sleepy as you don't seem to realize
that 66MHz 50 Ohms says nothing about this signal level.

As an aside, this group is about *design*. So most members think in that
direction when you ask a question. Eventually it's the way you'll have to go
if you really need it and it's nowhere for sale.

petrus bitbyter

 

[[email protected]]

Especially if you have a 10mVpp level. Even the PRL-255CN requires 2V.
Apparently you're either a newbie or sleepy as you don't seem to realize
that 66MHz 50 Ohms says nothing about this signal level.

As an aside, this group is about *design*. So most members think in that
direction when you ask a question. Eventually it's the way you'll have to go
if you really need it and it's nowhere for sale.

petrus bitbyter

The 66Mhz 50Ohm signal is sufficiently large, ~5vpp (no dc bias), if i
need to I can add an amp no problem. With that said I appreciate any
ideas for where I might be able to find the frequency divider that I
spoke of earlier. thanks again.

 

[[email protected]]

Especially if you have a 10mVpp level. Even the PRL-255CN requires 2V.
Apparently you're either a newbie or sleepy as you don't seem to realize
that 66MHz 50 Ohms says nothing about this signal level.

As an aside, this group is about *design*. So most members think in that
direction when you ask a question. Eventually it's the way you'll have to go
if you really need it and it's nowhere for sale.

petrus bitbyter

The 66Mhz 50Ohm signal is sufficiently large, ~5vpp (no dc bias), if i
need to I can add an amp no problem. With that said I appreciate any
ideas for where I might be able to find the frequency divider that I
spoke of earlier. thanks again.

 

[bg]

[email protected] wrote in message

The 66Mhz 50Ohm signal is sufficiently large, ~5vpp (no dc bias), if i
need to I can add an amp no problem. With that said I appreciate any
ideas for where I might be able to find the frequency divider that I
spoke of earlier. thanks again.

Try searching for a frequency counter prescaler. These used to be fairly
common accessories for test equipment.
bg

 

[jasen]

My friend as I stated before I don't want a chip. I was hoping someone
might know of a vendor that sells sma boxed 50 ohm dividers that are in
the $100 range that meet my 66Mhz spec.

what power level can we expect on the line then?
Bye.
Jasen

 

[jasen]

The 66Mhz 50Ohm signal is sufficiently large, ~5vpp (no dc bias), if i
need to I can add an amp no problem. With that said I appreciate any
ideas for where I might be able to find the frequency divider that I
spoke of earlier. thanks again.

with a signal like that, there's a bunch of people here could build you one
for $100

it seems to me that all that's needed is to terminate the coax (unless this
is intended as a tap) scale the voltage to something compatible with your
favourite IC family and divide it by 4 with a <$1 chip.