is just as fast.
Wes N7WS.
On 3/1/2022 4:11 PM, Tom Holmes wrote:
John...
If you haven't already, look into the Leo Bodnar GPSDO. It is a couple hundred
bucks US, and the people I know who have them
are pretty happy with them. Not sure off the top of my head if they make a
PPS, however. And, he
of a foul up, my
security clearance wasn't received so instead of being in the indoor VIP viewing
area I was relegated to some outdoor bleachers in the hinderlands where the
countdown was from some distant speakers. By the time I heard it, the missile
was long gone.
Wes
https://v3.airspy.us/product/lb-gpsdo-mini/
I've been considering ordering a Bodnar just for frequency agility, but
have been
holding off out of concern for the complications of dealing with a foreign
supplier.
Dana
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The Chinese unit has an OCXO. I had it apart once and noted what parts were
used, but I've misplaced those notes. I have no good method(s), equipment wise,
to compare these.
Wes N7WS
On 7/20/2021 10:42 AM, John Ackermann wrote:
The Bodnar GPSDO is great for what it is, and has the great advantages
I wrote Tom, at the address he gave, on Saturday with a query. So far, no
reply.
Wes N7WS
On 7/19/2021 4:59 PM, John Miles wrote:
If you're looking for a low cost surplus GPSDO, the ones Tom mentioned in
his post on Saturday are the ones you want. Not a Thunderbolt-E, and not
something
No messages in weeks.
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radio (never
figured out why they didn't use one of their own) to come up with a fix that
entailed bonding a 1/8" thick aluminum stiffener to the circuit card. This
found it's way into production and a retrofit kit was offered for others.
Wes N7WS
On 4/1/2021 11:16 AM, Richard
On 3/30/2021 4:33 PM, Lux, Jim wrote:
On 3/30/21 2:56 PM, Wes wrote:
You would know better than I, but I was thinking of physical size; 100m v. 70m.
Obviously a BIG difference in TX power.
Wes
It's all about EIRP, baby.
I know they're talking about half a megawatt for GB, but I don't see
You would know better than I, but I was thinking of physical size; 100m v. 70m.
Obviously a BIG difference in TX power.
Wes
On 3/30/2021 2:00 PM, Lux, Jim wrote:
On 3/30/21 6:40 AM, Wes wrote:
Was a pity. China's FAST is receive only. I believe that leaves Green Bank
as the biggest
then a blower on a receive amplifier was unusual :-)
Wes Stewart N7WS
On 3/30/2021 4:06 AM, ew via time-nuts wrote:
GOOD Morning Tom
Thank you
of a Cadillac V8.
Wes N7WS
On 2/6/2021 1:23 PM, Tom Van Baak wrote:
> ptti/1981papers/Vol%2013_30.pdf
Note the dialog on the last page. Dave Wineland went on to win the 2012 Nobel
prize in Physics:
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Congratulations Tom! Happy, prosperous and healthy New Year to you and all of
the other nuts.
Wes Stewart, N7WS
On 12/31/2020 10:02 PM, Tom Van Baak wrote:
Hello time nuts,
Ah, it is 2021-01-01 (JD 2459215.5, MJD 59215) which is nice because that
means it's not 2020 anymore.
One reason
The paper "Choosing a Phase Noise Measurement Technique", available on John
Miles' site might be of interest.
BTW, I worked with one of the authors, Terry Decker, for some years at Hughes.
Sharp lady.
Wes
On 12/17/2020 4:02 AM, Attila Kinali wrote:
Good afternoon,
In t
+to+quartz+crystal+unit+design
Wes N7WS
On 10/23/2020 2:11 PM, Attila Kinali wrote:
Moin,
I'm again hunting for some old stuff. Quite a few older papers,
books and technotes (including an article by Bernd Neubig from 1978)
reference V.Bottom's "The Theory and Design of Quartz Crystal U
hurt that they are
based here in Tucson :-)
Wes N7WS
On 9/25/2020 11:25 AM, John Ackermann N8UR wrote:
I've had good luck with Iota brand chargers for 12 and 24 volt... I think they
are "DCL" series or something similar. They are available in various amperage
and include a smart-
Thanks again for your insight Rick. I'll be passing on acquiring one of these.
Wes N7WS
On 7/13/2020 9:02 AM, Richard (Rick) Karlquist wrote:
On 7/13/2020 6:26 AM, Wes wrote:
Hi Magnus,
I did have the manual when I posed the original question but I had not delved
into the cal procedure
Thank you Paul.
On 7/11/2020 6:59 PM, paul swed wrote:
Wes many of the HP sig gens and counters use that method I might guess
starting in the 70s. They all lock very well to the external reference and
are as good as the external reference is.
One gotcha. It seems some people pull
ff-the-air frequency measurements where the unknown is mixed down
to audio.
Wes N7WS
On 7/11/2020 6:46 PM, Richard (Rick) Karlquist wrote:
On 7/11/2020 3:51 PM, Wes wrote:
As I understand it this counter has an external reference input that isn't
used directly as the time base but injection locks th
As I understand it this counter has an external reference input that isn't used
directly as the time base but injection locks the internal time base. Does
anyone here know how well this works. Is using a GPSDO as a reference a
worthwhile accuracy improvement?
Wes Stewart N7WS
olished as part of a "modernization" of
downtown (it's still a vacant lot) and I wondered how surprised they were when
they went to remove the slab.
Wes N7WS
On 6/28/2020 8:05 AM, Dr. David Kirkby wrote:
Dr David Kirkby Ph.D C.Eng MIET
Email: drkir...@kirkbymicrowave.co.uk Web:
https://
in a rural area outside of
Tucson so hopefully Ligado won't be an issue. We'll have to see if their
technical expertise is as good as the PR and lobby lawyers are.
Wes
On 6/6/2020 8:49 AM, Dana Whitlow wrote:
Wes, it sounds like you're in pretty good shape with one thing that
concerns me.
Unless your
m guessing
it's for NF optimization. So is the spec the nominal output Z (s21) of the
internal amplifier or is it the load the amplifier needs to be presented with to
deliver advertised gain? Who knows? Either way, my 75 ohm coax is within limits.
Wes N7WS
On 6/5/2020 4:56 PM, DON MUR
A 1.5:1 SWR = ~14 dB return loss.
On 6/5/2020 6:42 PM, Tom Holmes wrote:
Dana...
I think that you are neglecting two important mitigating factors.
1. the cable loss at 1575MHz, even for a 25' run of RG-6, reduces those
reflections quite a lot from one end to the other. It amounts to 2 -
You talked me in to it.
Wes N7WS
On 5/23/2020 8:19 AM, Jeremy Nichols wrote:
Sufficiently interesting that I bought a paper copy through Abebooks. Looks
like a somewhat later version, author given as Douglas Mudgway, title
“ Uplink-Downlink:
A History of the Deep Space Network 1957-1997
I can remember "wiring" up some X-band test equipment with WR90 waveguide,
flanges and a brazing torch. We "miniaturized" the missile hardware by using 1/4
height W/G. Circa 1966.
Wes
On 5/13/2020 9:12 AM, ew via time-nuts wrote:
You give away your age, was there did
AC0XU (Jim)
I responded to your email address and it bounced. I would be happy to get a
board from you.
Let me know how to proceed.
Thanks, Wes
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by an order of magnitude since then it seems. (I can remember laying out
boards by hand, taping up the artwork 4:1, reducing it photographically,
exposing and etching boards. So today's technology is magical.)
Many of you are doing some awesome work. Well done.
Wes N7WS
Does anyone know of a ready made board that will allow me to mount and at the
least, minimally support the operation of an MV89A oscillator. I have one which
I've powered up deadbug style and would like to clean up the mess a little.
Thanks
Wes N7WS
last night. The receiver is amazing. I'm
receiving 10 birds with the puck antenna inside. The Motorola Oncore sees 5 or
6 as does a Garmin GPSMAP60.
Wes
On 5/3/2020 6:56 AM, Bill Notfaded wrote:
Wes-
A great resource for info is the BG7TBL master thread at eevblog. We track
everything we know about t
eeks. It's continued to drift for
over two hours and now has approached 10 MHz but is still wandering around 4-5
mHz with respect to the Bodnar. Which is correct is anyone's guess.
I guess the next project should be to get the external antenna mounted and
splitter installed so everything i
Good question and the answer is, I don't know. The photo shows June 2018, but
who know whether that's representative. Being antsy, I opted to buy from a
seller in the US with quick shipping, rather than waiting six weeks for one from
Asia.
On 5/1/2020 8:37 PM, Bill Notfaded wrote:
Did you
Hi Bob,
According to the USPS tracking number I'll have a BG7TBL GPSDO on Monday :-)
I really wanted to "Buy American" but a 10 dB price difference is worth taking
the risk.
Wes
On 5/1/2020 7:29 PM, Bob kb8tq wrote:
Hi
I would guess that the vast majority of folks on the list a
clearly didn't want to
sell me anything, as exemplified by a fee of $47 to use a credit card.
As much as I would like to be more nutty, I can't justify spending this kind of
money just to participate in ARRL FMTs where the only direction I have to go is
down.
Wes N7WS
On 4/24/2020 11:56 AM
Hi Bob,
Honestly, I don't have any particular holdover requirements in mind, just that
it has some :-) This is just one of those nutty things. You must understand.
Wes N7WS
On 4/24/2020 10:14 AM, Bob kb8tq wrote:
Hi
On Apr 24, 2020, at 12:56 PM, Wes wrote:
No, I'm not looking
Taking some of the advice offered, I've emailed them for P I'll let you know
if I hear back.
Wes
On 4/24/2020 10:45 AM, Kevin Rowett wrote:
On Apr 24, 2020, at 10:32 AM, Mark Spencer wrote:
Speaking both as an amateur radio operator and some one who modestly pursues
precision time
, with better performance (holdover).
The Jackson Lab FireFly-IIA and the lookalike Symmetricom GPS-2500 both look
interesting. But, price and availability are elusive. Any advice on these or
alternatives will be appreciated.
Wes N7WS
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to
tweak whatever it was. I was forever grateful that we never fired any of these
in anger.
Wes N7WS
On 1/5/2020 7:50 PM, Bob kb8tq wrote:
Hi
Well, back in the 1970’s the orders went out for most government labs that they
*must*
power gear down at night. They had to re-wire so that the
Thank you, Mark.
That worked beautifully. BTW, for my unit and taste, a value of 45 was the best
compromise between contrast and viewing angle. The latter changes with contrast.
Wes
On 10/3/2019 3:54 PM, Mark Sims wrote:
The command $Cxx* will set the contrast. xx can be 00 to 63
On 10/4/2019 12:17 PM, MLewis wrote:
With audio signals, a soldered crimp is one of the worst possible connections.
Please explain.
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done
any programming?
Wes N7WS
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and follow the instructions there.
An impedance sweep of the input might give a clue about the LPF. When I get
mine I'll measure it.
On 9/27/2019 11:43 AM, Mark Sims wrote:
A list member did some experimenting with the unit and came up with this very
useful information:
"press and hold RST button, then MODE toggles LPF (low
Thanks for the input. I just ordered one.
(My 78th birthday will be next month. I should be downsizing but here I am
buying more stuff.)
Wes N7WS
On 9/26/2019 6:25 PM, Mark Sims wrote:
Miy FA2 came in today. A very quick test shows that it works. It does not
appear to have the -0.0002
I saw that too a few days ago and was intrigued. It sort of looks like an FA1
with some smarts and a display. I'm also interested in others' experience.
Wes
On 9/4/2019 9:53 AM, Perry Sandeen via time-nuts wrote:
Yo Bubba Dudes!,
While looking on ebay at the BG7TBL FA1 analyzer I looked
no failures, but I did
repair another one many years ago. (See:
http://www.peakbagging.com/Electronic/HP8405A%20repair.pdf)
One can digitize the analog outputs which I did for some test or another about
40 years ago.
Wes N7WS
On 7/30/2019 5:30 AM, Bob kb8tq wrote:
Hi
The 8405 is a fine
Mine had the batteries out for about a year. Put some fresh ones in, turned it
on and set it outside for several minutes. It located position and is showing
today's date and time just fine. Software version on mine is 4.58.
Wes
It had to On 4/6/2019 12:10 AM, David J Taylor via time-nuts
I have a Fluke 87V that I bought from a fellow on one of these reflectors for
about a third the price of new. It does more than I need.
A lesser model would be fine for general purpose use. As we used to say in the
lab at work, "If it works, it's a Fluke."
Wes N7WS
On 3/23/20
It does have a couple of Timenuts stories: "The High-Speed Frequency
Counter---A new Solution to an Old Problem", which describes the HP 524 from
January 1951 and "A New Performance of the "Flying Clock" Experiment" from July
1964.
Wes N7WS
On 1/23/2019 6:41 PM
and
then closed the door. The isolation dropped over 20 dB.
Wes N7WS
On 12/12/2018 10:56 AM, jimlux wrote:
At JPL we regularly do measurements of signals at <-150 dBm into sensitive
deep space receivers, and we're obsessive about phase (since that's how we
measure the distance to spacecr
I'm not up to doing the whole project, but I would certain be interested in 2 or
3 boards for sure.
Wes Stewart N7WS
On 10/26/2018 5:51 AM, Bob Martin wrote:
Bert,
That looks like a useful board. Certainly some of the oscillators I'm giving
away would fit nicely on it. Since it looks
I'd look for the appropriate crystals. If it will help, I have a 250.00 kHz one
you can have.
Wes N7WS
On 9/14/2018 9:14 AM, lstosk...@cox.net wrote:
Off topic for this list, but you guys are experts in oscillator noise!
Playing with some mechanical filters. Need USB and LSB crystals
Before retiring I did some field work on the Tomahawk AGR
(https://www.raytheon.com/capabilities/products/gps_anti-jam)
Wes N7WS
On 8/30/2018 4:05 PM, Gregory Maxwell wrote:
However, the short wavelengths of GPS make beam forming a reasonable
countermeasure against jamming
here and the gate is
unlocked. If you were to come in you could look at the antennas, but please
stay in your car." So we did.
Wes
On 8/12/2018 4:05 PM, Bill Hawkins wrote:
Group,
This subject needs some additional detail. I found an article with comments at
https://swling.com/blog/20
which have immediate effect on lots of people.
What are the effects on the budget of running WWV/WWVB? The electric bill I
would guess. When John Q. Public's "atomic clock" stops working, they'll find a
way to pay the bill.
Wes
On 8/12/2018 11:58 AM, djl wrote:
Just a word: When budge
/AnalysIR/10mhz-ocxo-frequency-standard-module-or-kit/?pt=ac_prod_search
with a footprint that will accept the MV80.
Does anyone know of such a source?
Thanks, Wes
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