What's the cleanest way to produce 1 and 5 MHz from 10 MHz?
A friend of mine has a GPS receiver with a Stanford PRS 10 rubidium as
a frequency standard he uses for his test equipment - mainly signal
generators, spectrum analysers etc. Most kit takes a 10 MHz sine wave.
Some of his kit needs 1 MHz and other bits 5 MHz. What is the cleanest
way to derive these frequencies from 10 MHz. I would suspect a number
like 10, which is not a power of 2, would present more of a problem.
I don't know what kit he has that needs 1 or 5 MHz,so I don't know how
fussy it is.
Dave
David Kirkby wrote:
A friend of mine has a GPS receiver with a Stanford PRS 10 rubidium as
a frequency standard he uses for his test equipment - mainly signal
generators, spectrum analysers etc. Most kit takes a 10 MHz sine wave.
Some of his kit needs 1 MHz and other bits 5 MHz. What is the cleanest
way to derive these frequencies from 10 MHz. I would suspect a number
like 10, which is not a power of 2, would present more of a problem.
I don't know what kit he has that needs 1 or 5 MHz,so I don't know how
fussy it is.
Dave
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David
High level injection locking of an oscillator with a suitable topology
has been made to work well.
The phase noise of the free running oscillator isn't too critical as the
high level injection locked oscillator acts as a complete very wideband
1st order PLL with the pahse offset from the reference determined by the
oscillator tank tuning.
Alternatively one can use the more general form of the regenerative
divider which has an output frequency other than the standard fin/2 or
3fin/2.
To produce an output of fin/10, the regeneration loop needs to ensure
that both 0.1fin and 0.9fin signals are fed back to the mixer.
Bruce
Hi people
I too needed a 1MHz reference to drive my HP5245L counter.
I simply fed the t.bolt's 10 MHz output into a single transistor amp to obtain
5V p.p and divided down using a TTL 7490 chip.
This I followed with a six stage Chebichev 1Mhz low pass filter to "knock-off" the rough "corner" spots and this fed into the counter.
It all seems to work with accurate readings from a known frequency source out of
the counter.
It's simple but perhaps not too elegant
Cheers
Arie
VK3DBF
--- On Tue, 28/7/09, David Kirkby david.kirkby@onetel.net wrote:
From: David Kirkby david.kirkby@onetel.net
Subject: [time-nuts] What's the cleanest way to produce 1 and 5 MHz from 10 MHz?
To: time-nuts@febo.com
Received: Tuesday, 28 July, 2009, 12:32 AM
A friend of mine has a GPS receiver with a Stanford PRS 10 rubidium as
a frequency standard he uses for his test equipment - mainly signal
generators, spectrum analysers etc. Most kit takes a 10 MHz sine wave.
Some of his kit needs 1 MHz and other bits 5 MHz. What is the cleanest
way to derive these frequencies from 10 MHz. I would suspect a number
like 10, which is not a power of 2, would present more of a problem.
I don't know what kit he has that needs 1 or 5 MHz,so I don't know how
fussy it is.
Dave
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and follow the instructions there.
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If you want a 'vintage' solution, the HP 5087A can be configured to take a
single 5 or 10 MHz and divide/multiply it to 10 MHz, 5 MHz, 1 MHz and even
0.1 MHz then feed that to various output amplifiers of 10, 5, 1 or 0.1 for
up to 12 total outputs of your configuration. However, you might be looking
for a long time to find all the right cards.
Joe
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of arie schellaars
Sent: Tuesday, July 28, 2009 3:40 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] What's the cleanest way to produce 1 and 5 MHz
from10 MHz?
Hi people
I too needed a 1MHz reference to drive my HP5245L counter.
I simply fed the t.bolt's 10 MHz output into a single transistor amp to
obtain
5V p.p and divided down using a TTL 7490 chip.
This I followed with a six stage Chebichev 1Mhz low pass filter to
"knock-off" the rough "corner" spots and this fed into the counter. It all
seems to work with accurate readings from a known frequency source out of
the counter.
It's simple but perhaps not too elegant
Cheers
Arie
VK3DBF
--- On Tue, 28/7/09, David Kirkby david.kirkby@onetel.net wrote:
From: David Kirkby david.kirkby@onetel.net
Subject: [time-nuts] What's the cleanest way to produce 1 and 5 MHz from 10
MHz?
To: time-nuts@febo.com
Received: Tuesday, 28 July, 2009, 12:32 AM
A friend of mine has a GPS receiver with a Stanford PRS 10 rubidium as a
frequency standard he uses for his test equipment - mainly signal
generators, spectrum analysers etc. Most kit takes a 10 MHz sine wave.
Some of his kit needs 1 MHz and other bits 5 MHz. What is the cleanest way
to derive these frequencies from 10 MHz. I would suspect a number like 10,
which is not a power of 2, would present more of a problem.
I don't know what kit he has that needs 1 or 5 MHz,so I don't know how fussy
it is.
Dave
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On 7/28/09 4:47 AM, "J. L. Trantham" jltran@worldnet.att.net wrote:
If you want a 'vintage' solution, the HP 5087A can be configured to take a
single 5 or 10 MHz and divide/multiply it to 10 MHz, 5 MHz, 1 MHz and even
0.1 MHz then feed that to various output amplifiers of 10, 5, 1 or 0.1 for
up to 12 total outputs of your configuration. However, you might be looking
for a long time to find all the right cards.
Joe
Symmetricom sells a box that does the same, oddly called the 5087B. Yes,
almost certainly a few kilobucks. And I don't think it will do any rate
changes.