Thanks to you and the others for your replies. After some more HF reception
problems here, I have come to the same conclusion as you. I found an Oncore
M12+ timing GPS is available pretty cheap from Hong Kong, so that's my plan.
Years ago, I remember smiling when I figured out that I could
John,
Besides the M12 receiver you will need an interface board to provide a 3.3 volt
regulator for the M12, a 5 volt regulator and some 74c04's or some such to
provide the 1pps interface and drive levels to a MAX232 chip for a RS232
interface. Then you will need to build up the Brooke Shera
John,
One other thing I forgot to touch on. The 1pps signal out of the a GPS receiver
is very jittery. For your TCXO it will be good enough except for you having to
stare at the scope while comparing the GPS to your TCXO. Any oscillator of
higher quality will be a problem when just using the
On Wed, Feb 16, 2011 at 11:43 PM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
Would you count these as nearer a working system? Only needs USB power,
and includes the antenna and cable.
http://www.sureelectronics.net/goods.php?id=99
I'm still waiting for mine to arrive.
The
] On
Behalf Of John Beale
Sent: Thursday, February 17, 2011 1:10 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Freq cal to 1ppm without GPSDO
Hi Murray,
Thanks to you and the others for your replies. After some more HF reception
problems here, I have come to the same conclusion as you. I found
John,
I've had quite a bit of experience doing what you want to do, and have tried
several methods. TV used to be a good way, but now that everything's gone
digital that method is out.
Despite advice to the contrary, comparing with WWV or similar on HF is NOT
reliable to 1ppm. This is because
Hi Murray,
Thanks to you and the others for your replies. After some more HF reception
problems here, I have come to the same conclusion as you. I found an Oncore
M12+ timing GPS is available pretty cheap from Hong Kong, so that's my plan.
best regards,
John Beale
1. My best advice is to
On Wed, Feb 16, 2011 at 10:09 PM, John Beale be...@bealecorner.com wrote:
Hi Murray,
Thanks to you and the others for your replies. After some more HF reception
problems here, I have come to the same conclusion as you. I found an Oncore
M12+ timing GPS is available pretty cheap from Hong
Yes they sell for about $35 on EB. But you will need to build a
support/interface for it. Yo will need some voltage regulators, a
74*04 inverter (the RS232 standard has DCD non-inverted but inverts
data) TTL to RS232 level converters, 10-pin female headers and other
misc parts. And a GPS
