At 05:53 PM 9/6/2005, ecellison wrote:
Jim
I knew i could bait you! (smile). I am sort of gobbled up by this
precision thing! I do have my GPS receiver and am ready for the 1 part to
the -13 (give or take a couple of exponents!). Can we take the 200 mhz
standard out of the SDR 1000 as is?
At 07:12 PM 9/6/2005, Tom Clark, W3IWI wrote:
Eric wrote:
Tom
et al
Youse guys are going to get Jim Lux into this again! (REALLY do love your
comments Jim). This is probably a do-able topic for early next year. Hey!
Why not long term aging, and Loran. Not kidding. Anything is possible in
Tim Ellison wrote:
Reflock II info:
http://gref.cfn.ist.utl.pt/cupido/reflock.html
Cost is going to be near $1000
http://www.tapr.org/products.php
You caught us... the Reflock II is going to fund the next TAPR board
retreat in the Bahamas. :-)
Actually, the prices are placeholders
PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John Ackermann
N8UR
Sent: Wednesday, September 07, 2005 9:08 AM
To: Jim Lux
Cc: FlexRadio@flex-radio.biz; [EMAIL PROTECTED]
Subject: Re: [Flexradio] Ext. Reference clock kit
All --
Just FYI, TAPR is working not only on the Reflock II, which can phase
What about the pll locking systems from velalq ?
Is this any use?
http://ve1alq.com/clpd_pll/clpd_pll.htm
W9RAY
Jim Lux escribió:
No.. you really don't want an oscillator that can be adjusted...
What you want is a very finely programmable divider that gets adjusted so
that it tracks the oscillator's frequency. For instance, if you have a DDS
that puts out 10 MHz from a 200 MHz output, the notional
Title: Ext. Reference clock kit
I was wondering if anyone is using a GPS to generate the 10 or 20 MHz frequency reference used with the external reference clock kit?
If so, how did you do it? I have a GPS receiver (hockey puck, NEMA output) that I'd like to use for this if it is possible.
richard allen wrote:
Message
(snip) It provides accuracy of better that 1
part in 10**(-10) or 1 Hz at 10 GHz. Its 10 MHz output will drive the
little conversion kit for the sdr1k available from FlexRadio.
One word of caution. When 10 MHz is fed into the same socket as the
present
, September 06, 2005
7:46 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Ext.
Reference clock kit
richard allen wrote:
(snip) It provides accuracy of better that
1 part in 10**(-10) or 1 Hz at 10 GHz. Its 10 MHz output will drive the
little conversion kit for the sdr1k available from
are NOT going for 10 mhz multiplied, but 1 cycle or so at 200 mhz!
Eric2 AA4SW
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]
On Behalf Of Tom Clark, W3IWI
Sent: Tuesday, September 06, 2005 7:46 PM
To: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Ext. Reference clock kit
richard allen wrote
PROTECTED];
FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Ext.
Reference clock kit
I would just echo Tom's comments... you're much better off using the
GPS to discipline a 200 MHz source.
An even easier way is to put your (quiet) 200 MHz oscillator in a separate box
(pref ovenized
Philosophically, if you can avoid needing to steer your oscillator,
that has two advantages:
1) The tuning pin doesn't provide an additional noise-frequency change path
2) The crystal can be higher Q, because it doesn't need to be adjustable.
Sounds like an application for the Huff'n'Puff
: [Flexradio] Ext. Reference clock kit
Philosophically, if you can avoid needing to steer your oscillator,
that has two advantages:
1) The tuning pin doesn't provide an additional noise-frequency change
path
2) The crystal can be higher Q, because it doesn't need to be
adjustable.
Sounds like
Been out of it for a while. Maybe I'm being duped, but what the heck I s a
Huff'n'Puff? !!!
It is a means of gently stabilizing an oscillator. It requires the
oscillator to be reasonably stable already. There are several examples
of this sort of circuit, pioneered by PA0KSB back in the early
Lyle
Tnanks ... Readin
Eric2
-Original Message-
From: Lyle Johnson [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 06, 2005 9:11 PM
To: ecellison
Cc: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] Ext. Reference clock kit
Been out of it for a while. Maybe I'm being duped
Eric wrote:
Message
Tom et al
Youse guys
are going to get Jim Lux into
this again! (REALLY do love your comments Jim). This is probably a
do-able
topic for early next year. Hey! Why not long term aging, and Loran. Not
kidding. Anything is possible in software with a
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