I feel guilty now:-)
Obviously MSF is strong up here but I was able to receive it from Rugby when I
first moved north using a directional LF antenna and was under the impression
coverage was still ok throughout the UK, although it seems I was wrong on that.
The French station is TDF transmitted
Good morning
I agree that 1deg is overkill but I was simply extrapolating one extra decade
from BOB kb8tq's "backing off a bit" comment where he got down to 10deg. :-)
10MHz is an obvious sample rate - sorry, that fell into a blind spot here!
I think I will get distracted over Christmas
In message
,
"John Moran, Scawby Design"
writes:
>I think I will get distracted over Christmas sketching out some designs ...
Grab som I+Q samples from a kiwisdr somewhere and start playing with
signals instead.
If you like it, start making hardware.
--
Poul-Henning Kamp |
For other reasons and other bands (650m), I am very interested in narrow band
SDR, but I have not found a platform to get started on.
-Original Message-
From: time-nuts On Behalf Of Poul-Henning
Kamp
Sent: Tuesday, December 4, 2018 1:31 PM
To: Discussion of precise time and frequency
In message <4a8ff8d6-70b2-782e-cb79-21c7e9a49...@earthlink.net>, jimlux writes:
>If I were decoding WWVB to start, I'd break my samples up into 0.1
>second or 0.5 second chunks and process them to see what the carrier
>phase is.
With stable signals like this, it is a bad idea to chop
On 12/5/18 5:39 AM, Poul-Henning Kamp wrote:
In message <4a8ff8d6-70b2-782e-cb79-21c7e9a49...@earthlink.net>, jimlux writes:
If I were decoding WWVB to start, I'd break my samples up into 0.1
second or 0.5 second chunks and process them to see what the carrier
phase is.
With stable
On Tue, 4 Dec 2018 21:42:41 +
Gregory Maxwell wrote:
> On Tue, Dec 4, 2018 at 9:22 PM Attila Kinali wrote:
> > known bits in the BPSK signal are the first 12 bits of each minute.
>
> This seems transparently incorrect to me. If your receiver has access
> to only a tiny chunk of signal and
Hey Poul-Henning!
On Tue, 04 Dec 2018 22:56:54 +
"Poul-Henning Kamp" wrote:
> And the BPSK does improve timing.
>
> If you have access to, and tracks the carrier, you can nail the
> timing all the way down to 1/your_sample_rate.
Yes, but the same is true for pure AM modulation. If you
Hi
> On Dec 5, 2018, at 8:45 AM, jimlux wrote:
>
> On 12/5/18 5:39 AM, Poul-Henning Kamp wrote:
>>
>> In message <4a8ff8d6-70b2-782e-cb79-21c7e9a49...@earthlink.net>, jimlux
>> writes:
>>> If I were decoding WWVB to start, I'd break my samples up into 0.1
>>> second or 0.5 second
Hi Bob,
On Tue, 4 Dec 2018 16:43:57 -0500
Bob kb8tq wrote:
> The one thing the Everest chips do indeed do is demonstrate that initial
> signal
> acquisition can be done under really awful conditions. Getting the same info
> off
> of WWVB with AM only …. not so much ….At least not so much
On Tue, 4 Dec 2018 14:44:38 -0800
jimlux wrote:
> 17 passive components and 4 active components. plus the loopstick and
> tuning cap. I think you'd need pretty substantial volumes to get the
> "assembled and delivered" price below $20.
Oh. Sorry, I misunderstood. My design was never intended
On Wed, 5 Dec 2018 06:29:01 -0800
"Richard (Rick) Karlquist" wrote:
> Interesting: isn't 162 kHz within the European
> Long Wave Broadcast Band? Wouldn't there be a
> problem with QRM from these megawatt stations?
> Excuse the naive questions; we don't have longwave
> in the states, so no
In message , jimlux writes:
>If anyone has a suggestion for an off the shelf active antenna that's
>orderable and receivable by Friday, I'd love to hear it. There's 3 or 4
>of them I've seen (Clifford labs, DX Engineering has one, I'm sure MFJ
>has one)
There is one experiment I
https://www.rtl-sdr.com/tag/vlf/
a fair number of examples -
As I speculated, the 8 bit RTL-SDR has a problem with strong broadcast
band AM, so you need some sort of LPF.
There are some examples of "amplified whip into sound card into Rpi"
implementations.
I didn't see anybody actually
On 12/4/2018 6:29 PM, Gilles Clement wrote:
Hi,
In France the carrier frequency is 162khz (Allouis)
Phase modulated over one minute.
Gilles.
Interesting: isn't 162 kHz within the European
Long Wave Broadcast Band? Wouldn't there be a
problem with QRM from these megawatt stations?
Excuse the
Hi,
On 12/5/18 3:47 PM, Attila Kinali wrote:
> On Wed, 5 Dec 2018 06:29:01 -0800
> "Richard (Rick) Karlquist" wrote:
>
>> Interesting: isn't 162 kHz within the European
>> Long Wave Broadcast Band? Wouldn't there be a
>> problem with QRM from these megawatt stations?
>> Excuse the naive
In message , Magnus D
anielson writes:
>Looking at it using a Kiwi receiver just north of Stockholm, it comes in
>nice and clean with 100 Hz sidebands from what looks like a PM whose 4th
>sideband is nearly suppressed, so is 8th, 12/13, 21... so slightly more
>that 4th and multiples.
It
Hi,
On 12/5/18 4:27 PM, Poul-Henning Kamp wrote:
>
> In message , Magnus
> D
> anielson writes:
>
>> Looking at it using a Kiwi receiver just north of Stockholm, it comes in
>> nice and clean with 100 Hz sidebands from what looks like a PM whose 4th
>> sideband is nearly suppressed, so
Hi
One of the most common things to do for an antenna is to come up with a
resonant
loop. That gives you *some* rejection of the massive 60 KHz switcher noise you
have
to deal with. By fiddling a bit with the turns and pickoff, you can come up
with a
high Z output (if you like JFET front
On Wed, Dec 5, 2018 at 8:52 AM jimlux wrote:
> On 12/5/18 6:32 AM, Bob kb8tq wrote:
> > Hi
> >
> >> On Dec 5, 2018, at 8:45 AM, jimlux wrote:
> >>
> >> On 12/5/18 5:39 AM, Poul-Henning Kamp wrote:
> >>>
> >>> In message <4a8ff8d6-70b2-782e-cb79-21c7e9a49...@earthlink.net>,
> jimlux
In message <3c33da4e-df22-1ae1-3d09-3667d6691...@febo.com>, John Ackermann N8UR
writes:
I built one of Chris Trask's designs some years ago, and it works fantastic
well.
He has many antenna designs, see the bottom of:
http://www.home.earthlink.net/~christrask/
I picked the one
I also ordered one of the EverSet Dev Boards.
Pricey for a one IC "glop-top" package, but I would like to see how it
performs.
But, I could not duplicate quantity one for the price, either.
I also note that they sold out about mid day yesterday, so Tom's
announcement cleaned them out.
As far as
Hi,
The Allouis phase modulation is as follows :
- sawtooth phase shift of the 162kHz carrier with 40rad/sec slope => +/- 1 rad
shift => +/- 6,36Hz carrier frequency shift
- sequence of full sawtooth periods of length 100msec => frequency 10Hz
- one full period sawtooth codes a « 0 » bit
- two
On Wed, Dec 05, 2018 at 08:23:59PM +, Poul-Henning Kamp wrote:
>
> In message ,
> Club-Intern
> et Clemgill writes:
>
> >- One bit only is coded per second in each minute => 59 bits available
> >because...
> >- 59th second is silent (no phase modulation)
>
> I belive this is
I generated a spiral plot of phase and amplitude covering about 3 minutes of
WWVB last fall. It's a good-size file, around 2MB as I recall.
Should I send it?
Dana
On Wed, Dec 5, 2018 at 8:56 AM jimlux wrote:
> https://www.rtl-sdr.com/tag/vlf/
>
> a fair number of examples -
>
> As I
On 12/5/18 4:36 PM, Poul-Henning Kamp wrote:
Johns sample-rate appears to be almost 1000PPM fast and
drifting, it it is trivial to adjust the "do" to keep either
the ali or alq haunting zero.
Yes, I should have mentioned that the Red Pitaya does not have a
reasonable way to run with external
Be careful, shielding can lower the Q impressively due to parasitic capacitance.
Winding more than about a third of the length results in flux lines not
coupling to the outboard turns.
Ferrite antennas are fascinating.
Hi,
Thanks for all the replies. Looked into the Heol replacement gps
module, bit bullet and ordered one. Arrived today and on re
power up, the system was tracking 8 satellites 3D in 3 or 4
minutes. Quite impressive really and a great improvement on the
original module, even without the
if anyone uses a coiled antenna .. best keep it in sight and have a fire
extinguisher handy.
Ian, G4ICV, AB2GR
--
On 12/5/18 5:51 PM, Ian Stirling wrote:
I do not know what the fire risk is, covering it with foil or not.
I have a radio amateur friend who tried to use a coiled antenna
and
In message , Club-Intern
et Clemgill writes:
>- One bit only is coded per second in each minute => 59 bits available
>because...
>- 59th second is silent (no phase modulation)
I belive this is wrong.
The timecode (substantially the same as DCF77) occupies only one
bit (the first) in
On Wed, Dec 5, 2018 at 11:12 PM detlef.amb...@gmx.de
wrote:
> if you need the frequency, amplitude and phase of a sampled sine wave
> there is a solution without correlation, nonlinear fit or interpolation
> in the frequency domain. It works with damped sine waves as well.
>
> You just have to
Hi
The “good sound card” in this case is indeed not quite as easy to find
as one might think. Most people playing with audio rarely are concerned
once you get past 20KHz or so. Finding a card that stays quiet past
40 KHz can be tough. Even on a 192 KHz card, one can find anti-alias
filters
Hi all,
This is my first post to time-nuts, though I've been following the list for
a few years now. I've been reading the WWVB discussion over the past couple
days and keeping up as best as I can, and wanted to mention that I
presented at ION PTTI 2018 about microsecond level WWVB. I also
In message <2ce7bd8e-ab0c-0f0f-568a-dac7088fa...@febo.com>, John Ackermann N8UR
writes:
>While everyone's been talking :-) , I recorded some WWVB IQ data for
>folks to play with. You can download it from
>http://febo.com/pages/wwvb/
>
>The receiver ran at 48 ksps and was centered on
I do not know what the fire risk is, covering it with foil or not.
I have a radio amateur friend who tried to use a coiled antenna
and it sparked in various places. He gave up using it.
Ian, G4ICV, AB2GR
--
___
time-nuts mailing list --
In message , jimlux
writes:
> If anyone has a suggestion for an off the shelf active antenna that's
> orderable and receivable by Friday, I'd love to hear it. There's 3 or 4
> of them I've seen (Clifford labs, DX Engineering has one, I'm sure MFJ
> has one)
I have a couple of the Clifton Labs
On 12/5/18 7:30 AM, Poul-Henning Kamp wrote:
In message , jimlux writes:
If anyone has a suggestion for an off the shelf active antenna that's
orderable and receivable by Friday, I'd love to hear it. There's 3 or 4
of them I've seen (Clifford labs, DX Engineering has one, I'm sure
While everyone's been talking :-) , I recorded some WWVB IQ data for
folks to play with. You can download it from
http://febo.com/pages/wwvb/
The receiver ran at 48 ksps and was centered on 80 kHz (to allow a 20
kHz IF to move away from 0 Hz crud). The data was taken in early
afternoon in
In message , jimlux writes:
>On 12/5/18 5:39 AM, Poul-Henning Kamp wrote:
>All manner of PLLs don't work as well when the input signal is of
>varying amplitude. Maybe it works well enough here.
The PLL needs a phase offset input, if you do the circular buffer you
can stick three
There is a problem with most pre-amplifiers and also particularly with
anything up font of the sampling; to get good data the amplitude of the
sampled signal has to have relative high levels, comparable to
microphone output level -- up to 50mV -- if one wanted to use the sound
cart input.
Hi,
On 12/5/18 5:41 PM, Poul-Henning Kamp wrote:
>
> In message <4cf174e2-47fa-1013-b617-c66fc188f...@rubidium.dyndns.org>, Magnus
> D
> anielson writes:
>
The Loran-C/Chayka plug-in does not calculate position, so already there
would be some fun little mini-project to
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