The Ublox GPS units (like the Neo-6 and NEO-7) are not great for this
application. Their master oscillators are an oddball frequency (as far as
freq standards go, IIRC 48MHz?). That doesn't divide evenly to 10MHz, so
there is some jitter component at 10MHz output. Not what you want for a
reference signal.
I've used a used commercial-grade GPSDO that I found used, and an HP3801A
from ebay, both less than $100.
I've also purchased rubidium-based units, Efratom LPRO-101 from ebay for
about $75 each.
There are several other GPS-based thingies that aren't "disciplined" for
pretty good prices. The older Trimble units are usually good. Hams Summers
of QRPLabs.com sells a QLG1 for about $23 that seems to be usable - I think.
I've got one for my QRP Labs beacon. You might want to look at the specs
for the SKM1 GPS module on his board.
There are many designs for GPS disciplined oscillators, and many inexpensive
GPS receivers out there. Make sure their 10MHz output is stable. However,
if you want "portability", or your shack can't easily see the sky, you might
want to check out the various rubidium oscillators instead. I'm sure you
can find a TON more info on the timenuts forum.
Also be careful with the 10MHz reference signal distribution, it can play
havoc with the 30 Meters band (and 10MHz WWV), especially it it's a ratty
square wave.
73, Terry, N4TLF
-----Original Message-----
From: Kevin Cozens
Sent: Wednesday, March 09, 2016 5:51 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] 10 MHz external reference
Am 09.03.2016 um 18:37 schrieb Gary Smith:
What external 10-MHz reference signal source might I find get that is
not terribly expensive that will do the proper job and allow me to
get this working?
You can look for a GPS disciplined oscillator (GPSDO), an FE-5680 Rubidium
based oscillator, or look for some of the lesser expensive GPS receiver
modules that have 10MHz outputs.
A GPSDO can be expensive but there are some more affordable ones if you look
around. FE-5680's used to be available around $100US (or less if you got
lucky). Lately the prices seem to have gone up for these devices, and they
tend to be power hungry. There are some GPS receiver modules that have GPS
receiver blocks on them made by companies such as Ublox. Take a look for GPS
receiver devices that are meant to be used as part of a flight control
system for radio controlled aircraft (or what some people call drones).
--
Cheers!
Kevin.
http://www.ve3syb.ca/ |"Nerds make the shiny things that distract
Owner of Elecraft K2 #2172 | the mouth-breathers, and that's why we're
| powerful!"
#include <disclaimer/favourite> | --Chris Hardwick
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to wb4...@knology.net
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
