I am not very much interested in how it is achieved, but wonder if a
10MHz oscillator locked to GPS is now available as plugplay rather
than needing a lot of time/effort/building.
I note the Thunderbolt units available from the Far East on ebay
for~£80gbp. Are these really PP - that is, just
Yes the Thunderbold truly is plug and play. In holdover of course the Rb
will be more stable ...
The RS-232 connection also lets you see if it has achieved GPS lock - you
can't tell without something that talks to the RS-232 interface.
Dave
-Original Message-
From:
The Z3816A and Z3801A are plug and play with 4 LED status lights on the
front panel including GPS Lock. I have the Thunderbolt and a Z3816A and
find being able to review the information on the computer is very helpful
including looking for satellite tracking loss, open or shorter antenna
Message: 3
Date: Tue, 30 Jun 2009 00:20:50 +0200
From: Alberto di Bene dib...@usa.net
Subject: Re: [time-nuts] GPSDO project (SDR)
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Message-ID: 4a493e42.4010...@usa.net
Content-Type: text/plain;
I'm sorting through the junk I have been bringing home
and have a Spectracom 1961 w/o its antenna, and it does
blows its fuse when plugged in.
-pete
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There is one thing that make most GPSDOs not quite plug and play... that is
their need to know their location rather precisely. They do this with a self
survey mechanism. The self survey can take several hours. Most units can
trigger this automatically if their location changes more than a
Many thanks Mark.
I was thinking of setting up in a fixed position and leaving on
permanently. But then if there's a power cut?
Do you know if the China supplier is OK? Or any source in the UK of
Thunderbolt?
David
Mark Sims hol...@hotmail.com 30/06/09 17:48
There is one thing that make
I have my equipment attached to a rather large (100+ pounds) UPS device in
case of a power outage. It'll run a Thunderbolt for a week I'd suspect.
I've purchased several items from fluke.l (that's an L not a one) on eBay
with good results every time. The only problem I ever had was just this
I am not very much interested in how it is achieved, but wonder if a
10MHz oscillator locked to GPS is now available as plugplay rather
than needing a lot of time/effort/building.
I note the Thunderbolt units available from the Far East on ebay
for~£80gbp. Are these really PP - that is,
I suggest you try The RF Connection for adapters:
NM/FF
N(M)/F(F)
3.00
http://therfc.com/
Lester B Veenstra MØYCM K1YCM
les...@veenstras.com
m0...@veenstras.com
k1...@veenstras.com
US Postal Address:
PSC 45 Box 781
APO AE 09468 USA
UK Postal Address:
Dawn Cottage
Norwood, Harrogate
For really good adapters, I've had good luck with S.M. Electronics
(http://www.smelectronicsllc.com). They are pricey -- like $24-$36 each
for 18 GHz stainless N-to-something adapters, but I think on the whole
cheaper than Pasternack, and they often stock several grades (with
specified
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of John Ackermann N8UR
Sent: Tuesday, June 30, 2009 11:40 AM
To: les...@veenstras.com; Discussion of precise time and
frequency measurement
Subject: Re: [time-nuts] Plug and play
eBay. 12 bucks for 4 including shipping :)
-Bob
On Tue, Jun 30, 2009 at 12:17 PM, Lester Veenstra m0...@veenstras.comwrote:
I suggest you try The RF Connection for adapters:
NM/FF
N(M)/F(F)
3.00
http://therfc.com/
Lester B Veenstra MØYCM K1YCM
les...@veenstras.com
Hi David,
I don't know the Chinese ones, but I was lucky enough to get one of the TAPR
offer TBolts - and it really was PP - yes, I attached a PC and used the TBolt
monitoring utility to confirm it was all working OK, but that was all. It now
sits in my shack outputing 10MHz very nicely.
73,
There is one thing that make most GPSDOs not quite plug and play... that
is their need to know their location rather precisely.
Yes, it's helpful on the way to perfection. Is it a requirement for the
OPs level of ambition? I think not.
I wonder if the long self-survey procedure is an
Yes, you can just leave the unit running without much problem, but what works
really well is to use an old laptop as a permanent monitoring device. You can
get them for around 20 bucks... Lady Heather was created for Thunderbolt just
such a situation. Much more entertaining and
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims
Sent: Tuesday, June 30, 2009 2:32 PM
To: time-nuts@febo.com
Subject: [time-nuts] Plug and play GPSDOs was:(no subject)
Yes, you can just leave the unit running
The main reason for manually doing the self-survey and saving the results is so
that the unit won't spend hours doing it every time it powers up. It's a one
time thing and well worth the trouble.
Every foot of position error can introduce a nanosecond of offset in the timing
results.
In a message dated 30/06/2009 22:38:35 GMT Daylight Time,
james.p@jpl.nasa.gov writes:
Even better would be some ambitious amateur programming one of the little
LCD+microcontroller widgets to make a display. Probably not worth it,
dollar wise, but might be nice, especially for a
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com
Sent: Tuesday, June 30, 2009 2:48 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Plug and play GPSDOs was:(no subject)
-
Something like this by any
Hello David,
I'm a complete beginner in this field, but after a lot of reading and
following these threads, I finally bought a Tbolt from China via
e-bay. Arrived in just under a week by post, plugged it in to power
and antenna and got 10 MHz output.
I eventually connected a lap-top PC via
The Google patent search is a very useful for studying GPS
technology, precision oscillators, etc. It has been extremely
reliable in the past, but today it started giving an error message
after downloading only 5 patents. The error message is:
Google Error
This seller in CA is selling for $120 or less.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=160331810845
John, K1AE 1.8 MHz - 10 GHz.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of dave powis
Sent: Tuesday, June 30, 2009 4:59 PM
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