Hello Time Nuts,
I'm going to try a two antenna approach - parts are on order.
Buying a 2nd board vs. trying to implement a low-noise amplifier is a wash
for the cost
for the 2nd audio board.
It will require a few board mods - but they are simple.
When I have some interesting results, I will
That doesn't appear to give you 1/4 the base sampling rate as you suggest
with "... to sample at 4 times the desired rate..."
I do something similar on a 1kHz tone, generating I/Q at 1kHz sampling rate
on a bandwidth up to 500Hz, ie 750 - 1250Hz
Samples at 4kHz are S1, S2, S3, S4
Then I = S1 + S2
Thanks everyone for the responses. Enough for now. Time to make anything
happen.
Will let you know and perhaps start a new thread around this.
Regards
Paul
WB8TSL
On Sat, Oct 24, 2020 at 10:17 PM Graham / KE9H
wrote:
> Paul:
>
> The easiest way to convert a single sample into an I-Q
Paul:
The easiest way to convert a single sample into an I-Q representation is to
have a two phase local oscillator.
You multiply the incoming signal against the primary phase output of the
oscillator for the I channel,
and multiply the same sample against the 90 degree offset output for the Q
On 10/24/20 3:53 PM, paul swed wrote:
Antenna and filtering are not a problem for me. I use the 10' X 10' square
loop and about 800' of wire with a cap to resonate at 60 KHz and then a
preamp really to drive 140' of coax. Currently using a modified KD2BD
receiver frontend but using a 350 Hz xtal
Antenna and filtering are not a problem for me. I use the 10' X 10' square
loop and about 800' of wire with a cap to resonate at 60 KHz and then a
preamp really to drive 140' of coax. Currently using a modified KD2BD
receiver frontend but using a 350 Hz xtal filter. Yes indeed that hamfest
find
Hello Time Nuts and Paul,
Glad to hear you're making progress - of course, as Chris Howard mentioned
earlier - it's all based on this as a starting point:
https://github.com/DD4WH/Teensy-DCF77
and Chris' work is here:
https://github.com/chris-elfpen/Teensy4WWVBsdr
Those sites are good to look
Hello Time Nuts and Paul Again,
Paul - Have you thought about adding a 2nd audio board for the orthogonal
antenna?:
https://www.pjrc.com/store/teensy3_audio.html
I think adding a 2nd audio board could work for this possibly - of course
with the correct antenna set up.
Note the setup they have
John I was looking for a lot of things around BPSK and SDR and more.
Had not hit this repository yet. But it has the piles of functions that
would be useful. I noted it had a I & Q oscillator. So maybe the way this
all works is you grab these functions and line them up. In looking at the
wwvb SDR
Hello Time Nuts,
The code that has been previously discussed in this thread is posted here,
in case some of you didn't know and could be wondering about it:
https://github.com/chipaudette/OpenAudio_ArduinoLibrary
It's for the Teensy boards and WWV(B/H) SDR.
73's,
John
AJ6BC
On Sun, Oct 18,
Hello Time Nuts,
FYI: Teensy NTP server found here:
https://github.com/ddrown/teensy-ntp
73's,
John
AJ6BC
On Sat, Oct 17, 2020 at 1:16 PM paul swed wrote:
> The teensy arrived and was easily installed in the arduino IDE. Worked
> right off the bat.
> The wiring of the A/D and the TFT
The teensy arrived and was easily installed in the arduino IDE. Worked
right off the bat.
The wiring of the A/D and the TFT display is a bit less clear. I have all
of the details but need to go over them carefully. The teensy 4.0 is
slightly different in the pins used as compared to the various
Hello Time Nuts,
Maybe this should be added to this thread - this page is actually pretty
good:
https://en.wikipedia.org/wiki/WWVB
73's,
John
AJ6BC
On Tue, Oct 13, 2020 at 12:50 PM John C. Westmoreland, P.E. <
j...@westmorelandengineering.com> wrote:
> Hello Time Nuts,
>
> Paul, I haven't
Hello Time Nuts,
Paul, I haven't gone over in fine detail of how the multipsk software is
working - so I'd like to answer with that caveat if that's OK.
I thought it was more interesting that I got anything working as far as
60kHz with my existing OpenHPSDR rig AND my default antenna.
The system
John I looked at what you sent. I assume its decoding the am time signal is
that correct?
On Tue, Oct 13, 2020 at 1:19 PM Chris Howard wrote:
>
> That's a fair assessment. I'm really not very far into SDR programming,
> would like to learn more.
>
> I was working with someone who gave me a way
John
I would simply use any number of receivers and grab 60 KHz out of one or
could use the IF at 10 KHz or 1 KHz. But more fun to use 60 KHz. The cost
on the teensy components is very reasonable.
Regards
Paul
On Mon, Oct 12, 2020 at 7:44 PM John C. Westmoreland, P.E. <
Hello Time Nuts,
Chris - maybe you can share that if that's something you can share right
now.
Jim and Paul,
Like Chris pointed out - on that audio board in the design he's worked on -
the Line In has L and R channels - the input resistance is higher than for
the mic input -
but I suppose it's
I received a good pointer about doing the BPSK implementation
but have just not gotten it done.
Chris Howard
On 10/12/20 11:02 AM, jimlux wrote:
On 10/12/20 7:40 AM, paul swed wrote:
John really appreciate the pointer. Though it doesn't help wwvb BPSK
its a
really good intro to SDR and DSP
On 10/12/20 7:40 AM, paul swed wrote:
John really appreciate the pointer. Though it doesn't help wwvb BPSK its a
really good intro to SDR and DSP super simple. A good way to get your feet
wet. Hmmm is there a parts order soon? :-)
Regards
Paul
WB8TSL
And the teensy has plenty of space and
John really appreciate the pointer. Though it doesn't help wwvb BPSK its a
really good intro to SDR and DSP super simple. A good way to get your feet
wet. Hmmm is there a parts order soon? :-)
Regards
Paul
WB8TSL
On Mon, Oct 12, 2020 at 10:33 AM Bob kb8tq wrote:
> Hi
>
> The “ideal” antenna
John had not seen this before. It is a AM decoder. But its an interesting
start if you are less than 1000 miles from wwvb.
Regards
Paul
On Mon, Oct 12, 2020 at 6:52 AM John C. Westmoreland, P.E. <
j...@westmorelandengineering.com> wrote:
> Paul,
>
> Doesn't the post by Chris Howard above appear
Hi
The “ideal” antenna solenoid would be a bit longer ( say 2 X to 5X ).
The turns should be spaced apart by a few percent of the length.
( so turns over 30 or so … not so much …).
How much better is “ideal” compared to “just get it done?”. At least
from the stories that are told, it is
Paul,
Doesn't the post by Chris Howard above appear to be a good/great starting
point?
Seems like that approach could be extended.
https://github.com/chris-elfpen/Teensy4WWVBsdr
73's,
John
AJ6BC
On Sun, Oct 11, 2020 at 9:23 AM paul swed wrote:
> Good morning to the group. Both Rodger and I
Good morning to the group. Both Rodger and I can answer the last question
on the questionable bits very well.
I have 7 antique devices spectracoms truetime fluke tracor Dymec etc.
They handle it very well each has at least a 2 second integration time. The
dpskr has always taken advantage of this
Hi
The “simple” approach is to generate the full modulation pattern
for the signal based on a “known good” time source. There are a
couple of ambiguous bits so it will only be close. Feed that into
your inverter and the result will be (near) clean WWVB. Since you
never demodulate the WWVB,
The additional article John sent us is a pretty good read. Having soldered
all the little wires together with heat shrink, I can see the advantage of
the epoxy approach.
A consideration for the discussion. So far its been about the various tried
and true methods for a RF frontend. But the real
e to noise and propagation. So if charting suddenly
>> you
>>>> get a
>>>>>> 180 degree flip. Thats messy.
>>>>>> The doubling solution can work. Search for carter and there are
>>> several
>>>>>> others.
>>&
A general comment on the use of Schmitt-trigger and counters on a
conditioned analog signal:
You will likely run into issues with missing counts or additional counts
when the receiver experiences fadings or glitches (lightning, etc.)
If this happens, the 60 kHz signal will jump in phase.
Ole
rod antenna for the receiver. No outside
antenna.
Ray
Original Message ----
Subject: Re: [time-nuts] WWVB Dephaser Question
From: Bob kb8tq
Date: Thu, October 08, 2020 12:40 pm
To: Discussion of precise time and frequency measurement
Hi
A lot depends on your antenna setup. You ca
Paul, by going to high power mode I meant at the 200, 500, or 800 msec
point of each second.
Ray
Original Message
Subject: Re: [time-nuts] WWVB Dephaser Question
From: Bob kb8tq
Date: Fri, October 09, 2020 4:12 pm
To: Discussion of precise time and frequency measurement
Hi
t; > several
> > > >> others.
> > > >> But having tested and used all of the alternates and lots more on
> the
> > > east
> > > >> coast decided they were too much trouble. You should see the box of
> > > boards
> > > >&
of some sort. I have a couple of STM32
> development boards I can use when I get to that point.
>
> Ray
>
>
> Original Message
> Subject: Re: [time-nuts] WWVB Dephaser Question
> From: Bob kb8tq
> Date: Fri, October 09, 2020 12:23 pm
> To: Discussion of
PU yet. I will just use whatever it takes for
> the job, probably a STM32 part of some sort. I have a couple of STM32
> development boards I can use when I get to that point.
>
> Ray
>
>
> Original Message
> Subject: Re: [time-nuts] WWVB Dephaser Question
&g
o that option is out. I haven't
> made a decision on the CPU yet. I will just use whatever it takes for
> the job, probably a STM32 part of some sort. I have a couple of STM32
> development boards I can use when I get to that point.
>
> Ray
>
>
> Original Message --
r. Though in being above board I
>>>> designed version 1 and Rodger and I did version 2. Its solid and no
>> mods to
>>>> any receiver. Everything has always been released to the time-nuts
>> group.
>>>> As they say have fun.
>>>> Rega
ubling solution can work. Search for carter and there are
> several
> >>>> others.
> >>>> But having tested and used all of the alternates and lots more on the
> >> east
> >>>> coast decided they were too much trouble. You should see the box of
use whatever it takes for
the job, probably a STM32 part of some sort. I have a couple of STM32
development boards I can use when I get to that point.
Ray
Original Message
Subject: Re: [time-nuts] WWVB Dephaser Question
From: Bob kb8tq
Date: Fri, October 09, 2020 12:23 pm
> boards
> > >> I have chuckle.
> > >> For me I am very happy with the d-psk-r. Though in being above board I
> > >> designed version 1 and Rodger and I did version 2. Its solid and no
> > mods to
> > >> any receiver. Everything has always been
ots more on the
>> east
>>>> coast decided they were too much trouble. You should see the box of
>> boards
>>>> I have chuckle.
>>>> For me I am very happy with the d-psk-r. Though in being above board I
>>>> designed version 1 and Rodger a
d-psk-r. Though in being above board I
> >> designed version 1 and Rodger and I did version 2. Its solid and no
> mods to
> >> any receiver. Everything has always been released to the time-nuts
> group.
> >> As they say have fun.
> >> Regards
> >>
ata
> for my CPU to process and send to a display.
>
> I already have a GPS based clock that I built so I thought the WWVB
> phase clock would be an interesting project.
>
> Ray
>
> ---- Original Message
> Subject: Re: [time-nuts] WWVB Dephaser Qu
d be an interesting project.
>
> Ray
>
> ---- Original Message ----
> Subject: Re: [time-nuts] WWVB Dephaser Question
> From: Bob kb8tq
> Date: Fri, October 09, 2020 7:35 am
> To: Discussion of precise time and frequency measurement
>
>
> Hi
>
> At lea
t;> any receiver. Everything has always been released to the time-nuts
> group.
> >> As they say have fun.
> >> Regards
> >> Paul.
> >> WB8TSL
> >>
> >> On Thu, Oct 8, 2020 at 5:39 PM wrote:
> >>
> >>> Bob,
> >>>
> &g
Original Message
Subject: Re: [time-nuts] WWVB Dephaser Question
From: Bob kb8tq
Date: Fri, October 09, 2020 7:35 am
To: Discussion of precise time and frequency measurement
Hi
At least to me, anything dimensioned in the 100’s of feet is
“massive” compared to
the rod antennas
time-nuts group.
>> As they say have fun.
>> Regards
>> Paul.
>> WB8TSL
>>
>> On Thu, Oct 8, 2020 at 5:39 PM wrote:
>>
>>> Bob,
>>>
>>> I am using a ferrite rod antenna for the receiver. No outside antenna.
>>>
show the signal as being 1mV during the
> day. I know my wrist watch will synchronize during the day when I
> replace the batteries.
>
> Ray
>
> Original Message
> Subject: Re: [time-nuts] WWVB Dephaser Question
> From: paul swed
> Date: Thu,
show the signal as being 1mV during the
day. I know my wrist watch will synchronize during the day when I
replace the batteries.
Ray
Original Message
Subject: Re: [time-nuts] WWVB Dephaser Question
From: paul swed
Date: Thu, October 08, 2020 3:43 pm
To: Discussion of precise
> any receiver. Everything has always been released to the time-nuts group.
> As they say have fun.
> Regards
> Paul.
> WB8TSL
>
> On Thu, Oct 8, 2020 at 5:39 PM wrote:
>
> > Bob,
> >
> > I am using a ferrite rod antenna for the receiver. No outside ante
e antenna.
>
> Ray
>
> Original Message ----
> Subject: Re: [time-nuts] WWVB Dephaser Question
> From: Bob kb8tq
> Date: Thu, October 08, 2020 12:40 pm
> To: Discussion of precise time and frequency measurement
>
>
> Hi
>
> A lot depends on your an
> On Oct 8, 2020, at 4:50 PM, rcb...@atcelectronics.com wrote:
>
> Bob,
>
> I am using a ferrite rod antenna for the receiver. No outside antenna.
>
> Ray
>
> Original Message ----
> Subject: Re: [time-nuts] WWVB Dephaser Question
> From: Bob kb8tq
&g
Bob,
I am using a ferrite rod antenna for the receiver. No outside antenna.
Ray
Original Message
Subject: Re: [time-nuts] WWVB Dephaser Question
From: Bob kb8tq
Date: Thu, October 08, 2020 12:40 pm
To: Discussion of precise time and frequency measurement
Hi
A lot depends
Hi
A lot depends on your antenna setup. You can also swamp out the incoming
WWVB signal…….
Bob
> On Oct 8, 2020, at 2:07 PM,
> wrote:
>
> I have read several different articles where the WWVB phase shift is
> eliminated by doubling the signal to 120 kHz. Several members of the
> list have
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