Bizarre that no prescalers have been developed to work
on the 3-5 GHz band...
Well at www.hittite.com you will find many low priced
prescalers for 3-5 Ghz like HMC251 (3-6,5) and HMC432 (DC-8)
HMC363 (DC-12) and HMC365 (DC-13).
They all are in the $10$15 range
They also have 10GHz VCO so
Hittite has dividers (prescalers) that go to 18 GHz:
http://www.hittite.com/
I have a couple of samples of the :8 that goes to 12 GHz, precisely to
try and phase lock a Gunn, which I have not used yet (another long
winter project that won't happen as long as I am in Florida :-)
Didier
Normand
My original Question has sparked off quite an interesting discussion and
I learnt a lot
Since it seems that the Brooks Shera Project is not the optimum way of
GPS disciplining a Rubidium Oscillator can anyone here point me in the
direction of other DIY projects (or even ideas) that might yield a
Hi Brendan:
It's my take that there are two aspects of the Brooks (no relation)
design that need to be addressed for optimum operation:
1. the filter time constants of the stock design are not correct for a
Rb oscillator, and that can be fixed by getting a custom PIC from Brooks.
2. the TIC
On Tue, 2006-12-19 at 11:05 -0800, Brooke Clarke wrote:
Hi Brendan:
Keep in mind that this design does work and that the above items relate
to optimization not bug fixes.
I currently have the Brooks Shera design disciplining my LPRO-101
without any mods and using the ADC connected directly
Hi Brendan:
It's interesting that the PRS10 can time stamp the 1 PPS input with a
resolution of 10 ns. I wonder how they do that.
http://www.thinksrs.com/downloads/PDFs/Catalog/PRS10c.pdf
When I picked up my PRS10 at the factory during the tour I learned that
the 10 MHz oscillator in the
Magnus Danielson wrote:
From: Brooke Clarke [EMAIL PROTECTED]
Subject: Re: [time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit
Date: Tue, 19 Dec 2006 13:42:28 -0800
Message-ID: [EMAIL PROTECTED]
Hi Brendan:
It's interesting that the PRS10 can time stamp the 1 PPS input with a
From: Magnus Danielson [EMAIL PROTECTED]
Subject: Re: [time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit
Date: Tue, 19 Dec 2006 23:00:55 +0100 (CET)
Message-ID: [EMAIL PROTECTED]
From: Brooke Clarke [EMAIL PROTECTED]
Subject: Re: [time-nuts] LPRO-101 with Brooks Shera's GPS locking
From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit
Date: Wed, 20 Dec 2006 11:24:42 +1300
Message-ID: [EMAIL PROTECTED]
Magnus Danielson wrote:
From: Brooke Clarke [EMAIL PROTECTED]
Subject: Re: [time-nuts] LPRO-101 with Brooks
In message [EMAIL PROTECTED], Magnus Danielson wri
tes:
It actually uses the CPU builtin counter, which
will do for the purpose. They could have spent a little more and got better
single shot resolution out of it, but I suspect they didn't see the need.
They are limited by digital noise inside
From: Poul-Henning Kamp [EMAIL PROTECTED]
Subject: Re: [time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit
Date: Tue, 19 Dec 2006 23:17:03 +
Message-ID: [EMAIL PROTECTED]
In message [EMAIL PROTECTED], Magnus Danielson wri
tes:
It actually uses the CPU builtin counter, which
Noise like the oncore sawtooth isn't always a bad thing.
I was going to comment on that area... Thanks for the reminder.
The problem is that the sawtooth isn't noise in the normal Gaussian sense.
If you happen to hit a long/wide hanging bridge, the resulting offset may get
past your PLL
Hal Murray wrote:
Noise like the oncore sawtooth isn't always a bad thing.
I was going to comment on that area... Thanks for the reminder.
The problem is that the sawtooth isn't noise in the normal Gaussian sense.
If you happen to hit a long/wide hanging bridge, the resulting offset
I have a query. Does anyone have a favorite network time sync test software?
Here's my situation. Being at a radio and optical observatory, most
everything we do has varying degrees of time stamp criticality on the stored
data. While I could get obsessive compulsive and try to get everything
For the 2K/XP machines, ditch the built-in windows time sync and get NTP for
windows, also probably want to use their front-end app... It's free... I
think that will solve a majority of your problems. It allows for detailed
logging (at least the *nix version does).
I'll overlook the Windows bashing and try to answer your question.
The architecture of the PC and Windows prohibits anything (except an NMI) from
interrupting time keeping. Time is set in the Windows Kernel by the 2 user level
API's SetSystemTime and SetSystemTimeAdjustment. The later is use to
While talking about microwave prescalers, here's a 12
GHz prescaler project for the HP5328A frequency
counter by Bert VE2ZAZ. Thje prescaler is based on the
Hittite HMC363S8G div. by 8 12 GHz prescaler
http://www3.sympatico.ca/b.zauhar/hp5328a/hp5328a_prescaler.htm
The page not only shows the
[1]ftp://ftp.cnssys.com/pub/PTTI/PTTI_2006.pdfHal Murray said:
Noise like the oncore sawtooth isn't always a bad thing.
I was going to comment on that area... Thanks for the reminder.
The problem is that the sawtooth isn't noise in the normal Gaussian sense.
If you happen to hit a
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