The True Position GPSDO is working, locked to 8 satellites. It's 10MHz output
is extremely close to the X72's output. Using an oscilloscope to compare the
signals with a lissajous pattern, there is only a very small, slow movement,
barely perceivable. I don't need to do any calibration to the
I figured it out. It was the ASCII settings, it's working now.
- ASCII Sending, "Echo typed characters locally"
- ASCII Receiving, "Append line feeds to incoming line ends"
Thanks,Steve
On Sunday, October 1, 2017 8:30 AM, Stephan Flor wrote:
I received my True Position
I received my True Position GPSDO. I'm testing it.I am connected to it via a
rs232 port, and using HyperTerminal on a XP laptop to communicate. I'm getting
the boot message "GETVER 12.0.1 BOOT".
This may be a stupid question, but how do I get the boot message to stop so I
can send the "$P
On Sun, 24 Sep 2017 01:06:36 -0400
ewkehren via time-nuts wrote:
> Starting with a 10 second clean up loop for a FEI 5680/GPSDO to now 600
> Seconds using Wenzel's j circuit for the Tbolt we have a variety of boards.
Which one is Wenzel's j circuit? Google does not seem to be able to find it.
A
Meaning home=home ? just kidding. ,long staying constant
73 de Ulrich
In a message dated 9/24/2017 8:45:35 A.M. Eastern Daylight Time,
mag...@rubidium.dyndns.org writes:
Hi,
On 09/24/2017 02:30 PM, Bob kb8tq wrote:
> Hi
>
>
>> On Sep 23, 2017, at 9:39 PM, Hal Murray wrote:
>>
>>
>
Hi,
On 09/24/2017 02:30 PM, Bob kb8tq wrote:
Hi
On Sep 23, 2017, at 9:39 PM, Hal Murray wrote:
kb...@n1k.org said:
If the main use is feeding test gear (and not direct synthesis) an Rb may do
pretty well. Most instruments assume a dirty reference signal and clean it
up internally.
What'
Hi
> On Sep 23, 2017, at 9:39 PM, Hal Murray wrote:
>
>
> kb...@n1k.org said:
>> If the main use is feeding test gear (and not direct synthesis) an Rb may do
>> pretty well. Most instruments assume a dirty reference signal and clean it
>> up internally.
>
> What's the bandwidth on the typic
ehren
Sent from my Galaxy Tab® A
Original message From: Hal Murray
Date: 9/23/17 9:39 PM (GMT-05:00) To: Discussion of precise time and
frequency measurement Cc: hmur...@megapathdsl.net Subject:
Re: [time-nuts] True Position GPSDP + Rb X72
kb...@n1k.org said:
> If the mai
kb...@n1k.org said:
> If the main use is feeding test gear (and not direct synthesis) an Rb may do
> pretty well. Most instruments assume a dirty reference signal and clean it
> up internally.
What's the bandwidth on the typical cleanup PLL? How well does that match
the noise from a Rb?
--
Hi
If the main use is feeding test gear (and not direct synthesis) an Rb may do
pretty well. Most
instruments assume a dirty reference signal and clean it up internally.
1 Hz at 20 GHz is 5x10^-11 most sources you measure up there will not be stable
to 1Hz
at a 1 second gate. The Rb will be i
The highest frequency I can generate is 2.5 GHz. My counter can measure 20 GHz,
to 1 HZ. At the moment I'm have a frequency locking problem with the extension
module in my HP 8660C, so I can't even get to 2.5 GHz, only 110 MHz at the
moment. I gust got some extender boards, so I hope to have it
Hi
Given the noise levels of typical Rb’s - use XOR gates as the mixers.
Do a either a simple LPF on the output or ignore the HF component
(each approach is a bit of a tradeoff).
Once you have the beat notes, feed them into timer inputs on your uC
chip of choice.
If you do the filters as R/
On Wed, 20 Sep 2017 10:21:51 -0400
Bob kb8tq wrote:
> An alternative is to add an offset oscillator to the mix and look at beat
> notes. It does not have to be ultra close. An 11 MHz offset signal would take
> the
> 12 ns down to an effective 1.2 ns. Odd frequency OCXO’s sell cheap on
I consi
X72 support in Lady Heather is a new feature not in the current v5.0 release.
If you are running under Linux or can build the v5.0 Windows code, I can send
you the latest version tp compile.
The X72 has a DDS synthesizer on it that lets you vary the output freq in steps
of 2.03E-12 parts. My
On Wed, September 20, 2017 3:44 pm, Stephan Flo via time-nuts wrote:
> I just wanted a 10 MHz sync for my test equipment that was calibrated.
> May be the GPSDO is all I need.
Even an undisciplined rubidium oscillator is going to be very close to
nominal 10MHz. You have never stated your desired
Thank you for the great feedback. You guys make me realize that I need to
learn more, I have some studying to do. I will study while I wait for the True
position to arrive. Then I have to get it working. I just wanted a 10 MHz sync
for my test equipment that was calibrated. May be the GPSDO i
Thank you Mark. I'm just starting to learn about Rb oscillators and GPSDO. I
started on this while repairing my old HP 8660c signal generator, and I wanted
to get all of my equipment on a common sync clock. I bought the X72, because it
was small, thinking I may be able to replace the ocxo in th
GPS disciplined rubidium oscillators are generally not a good idea. Rubidiums
tend to be quite a bit more noisy than OCXOs. Their advantage is their long
term frequency stability. The GPS system in a GPSDO compensates for the OCXO
drift, so the only advantage of a GPS disciplined Rb is if yo
Hi
> On Sep 20, 2017, at 8:39 AM, Attila Kinali wrote:
>
> On Tue, 19 Sep 2017 18:09:16 + (UTC)
> Stephan Flor via time-nuts wrote:
>
>> Hi everyone,I'm new to this list, and I wanted to get the opinion of some
>> mere experienced people on my project idea.I just got a Symmetricom X72 Rb
On Tue, 19 Sep 2017 18:09:16 + (UTC)
Stephan Flor via time-nuts wrote:
> Hi everyone,I'm new to this list, and I wanted to get the opinion of some
> mere experienced people on my project idea.I just got a Symmetricom X72 Rb
> oscillator, and I have a True position GPSDO on the way. I wan't
Hi everyone,I'm new to this list, and I wanted to get the opinion of some mere
experienced people on my project idea.I just got a Symmetricom X72 Rb
oscillator, and I have a True position GPSDO on the way. I wan't to have a
self calibrating 10 MHz signal to synchronize my hobby rf lab equipment
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