Divide by ten front end for frequency counter
Gary Davis
divide by ten front end to increase the range to 300Mhz. Can anyone
refer me to a schematic that would serve this purpose? Any and all replies
will be most appreciated.
Regards,
Gary Davis
Peter Orban
Those circuits usually use a 11C90 which is an ECL circuit with TTL interface,
if I am correct.
Does anyone know who sells that chip in small quantities as well as the Harris
(Intersil) ICM7216 series chips?
Thanks, Peter
--
Peter Orban
National Research Council of Canada
Internet: peter...@nrc.ca
David Hutchinson
ARRL 1991 handbook has a nice counter front-end, with a MMIC amplifier before
the divider. I'm using this, except I use two MAV-3 amps, as they were to hand.
I get about 10-20 mV rms upto 550 MHz.
--David G8SQH
Roland B. Burgan
I have been informed by a number of sources that the 11C90 is no
longer available. I have not seen any divide by 10 (or 100)
IC's available for some time, now. Check with some surplus
equipment dealers for used counter converters, such as
Tucker Electronics (ask for the test equipment catalog)
(they also have a general electronics,communications catalog).
--
Don Montgomery
> My frequency counter tops out at 30Mhz. I would like to build a
Try the Motorola MC12080; a 1.1GHz prescaler that will divide by
10,20,40 or 80. Runs off 5 volts, consumes 3.7 mA, in a 8 pin
plastic DIP or SOIC. Operating window looks like it might make it
down to 2 meters.
Don Montgomery, K6LTS
do...@sr.hp.com
Jon Goguen
(Roland B. Burgan) wrote:
Motorola makes an ECL part called a universal hexadecimal counter
(MC10H136P, $12.54 in single quanity according to a recent Newark
catalog). As I understand it, this counter can be used as a programmable
divider with the divisor having any desired value between 1 and 256,
including 10. This is done by presetting the counter with a (binary
equivalent) value of 256-(desired divisor), and then counting the carry
output. Each time the counter rolls over, it resets to the preset value,
and counts from there to 256. It would be easy to make a switchable divide
by 10--divide by 100 counter by switching the preset between 246 and 156.
This counter works up to 550 MHz if I remember the spec. correctly.
Good luck!
Jon
--
Jon Goguen
"Nothing worth knowing can be understood by the human mind."
Eliot Fenton
MC12013. In addition, Newark, Hammond, etc. have enhanced 7216 series
counter chips that provide period measurement, etc. It should not be too
difficult to build a 3 GHz unit using a divide by four, xtal reference,
"mar" front end and a handful of support chips.
Jon Goguen
<72633...@compuserve.com> wrote:
How do you make the divide by four that operates to 3 GHz? I was under
the impression that some sort of frequency conversion scheme was used to
bring high frequencies down prior to the dividers and counters, but direct
division would certainly be a lot easier.
Cheers,
Leon Heller
a...@ultranet.com "Jon Goguen" writes:
> In article <415gsd$4...@bud.shadow.net>, Eliot Fenton
> <72633...@compuserve.com> wrote:
>
> > Motorola has a MECL divide by 10 with TTL outputs that's good to 550 MHz;
> > MC12013. In addition, Newark, Hammond, etc. have enhanced 7216 series
> > counter chips that provide period measurement, etc. It should not be too
> > difficult to build a 3 GHz unit using a divide by four, xtal reference,
> > "mar" front end and a handful of support chips.
>
> How do you make the divide by four that operates to 3 GHz? I was under
> the impression that some sort of frequency conversion scheme was used to
> bring high frequencies down prior to the dividers and counters, but direct
> division would certainly be a lot easier.
GEC-Plessey make 3 GHz dividers. I've got their catalogue somewhere if
you want more details.
Leon
--
Leon Heller, G1HSM | "Do not adjust your mind, there is
E-mail le...@lfheller.demon.co.uk | a fault in reality": on a wall
Phone: +44 (0)1734 266679 | many years ago in Oxford.
Jon Goguen
> GEC-Plessey make 3 GHz dividers. I've got their catalogue somewhere if
> you want more details.
>
Leon:
Do you know of any source for these dividers in small quantities?
Leon Heller
a...@ultranet.com "Jon Goguen" writes:
> In article <809205...@lfheller.demon.co.uk>, Le...@lfheller.demon.co.uk wrote:>
>
> > GEC-Plessey make 3 GHz dividers. I've got their catalogue somewhere if
> > you want more details.
> >
> Leon:
>
> Do you know of any source for these dividers in small quantities?
They are rather specialised, so you might have problems in the US. The
GEC Plessey N. American national sales office phone number is (408)
438-2900. They should be able to give you details of your nearest
distributor. Pioneer Standard and Insight stock GPS products, and seem
to have offices in most states.
A typical component is the SP8904B that goes up to 7000 MHz! They make
slower devices like the 3500 MHz SP8835B. 8-) These are both divide by
4s.
Fred McKenzie
(Jon Goguen) wrote:
> How do you make the divide by four that operates to 3 GHz? I was under
> the impression that some sort of frequency conversion scheme was used to
> bring high frequencies down prior to the dividers and counters, but direct
> division would certainly be a lot easier.
Jon-
Division is easier, but requires longer to measure to the same accuracy.
If you measure to one Hz with a one second time base and divide by 10,
your new measurement will only be to ten Hz.
Some counters, such as the Optoelectronics, use divide by 2 and divide by
4 prescalers for higher frequency measurements. Their circuitry
automatically lengthens the timebase to match, so you end up with the same
resolution at 2 or 4 times the original timebase, without having to do any
math yourself.
73, Fred, K4DII
Gerhard Hoffmann
Jon Goguen <a...@ultranet.com> wrote:
>
>How do you make the divide by four that operates to 3 GHz? I was under
>the impression that some sort of frequency conversion scheme was used to
>bring high frequencies down prior to the dividers and counters, but direct
>division would certainly be a lot easier.
>
and CXB1104 dual FF until 3.2 GHz.
The Motorola 10EL33 / 100EL33 is a %4 divider that works until 3800 MHz.
It is second sourced by Synergy Semiconductor.
Plessey has, among others the SP4908 2.5 GHz %8 prescaler.
Most satellite receivers have PLL chips with built-in prescalers
that go to 2.6 GHz.
Gerhard
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