Ray,
https://github.com/chris-elfpen/Teensy4WWVBsdr
73's,
John
AJ6BC
On Sat, Oct 31, 2020, 18:31 wrote:
> Bob,
>
> "Things already accomplished by Chris in the wwvb AM receiver"
>
> Is there a link to the AM receiver? Curious as to what that looks like.
>
> Ray,
> AB7HE
>
> Original
On 10/31/20 7:26 PM, Bob kb8tq wrote:
Hi
On Oct 31, 2020, at 9:45 PM, jimlux wrote:
On 10/31/20 4:46 PM, Bob kb8tq wrote:
Hi
Looking at the data sheet for the MCU, they really do want 24 MHz and that’s
about it. I suspect you would
do better to take your 10 MHz OCXO and run it into one
Hi
> On Oct 31, 2020, at 9:45 PM, jimlux wrote:
>
> On 10/31/20 4:46 PM, Bob kb8tq wrote:
>> Hi
>> Looking at the data sheet for the MCU, they really do want 24 MHz and that’s
>> about it. I suspect you would
>> do better to take your 10 MHz OCXO and run it into one of the frequency
>>
Hi
The gizmo you want is a hot air rework tool. They are not all that expensive
( < $200 for a fancy one, quite a bit less for a simple one). They normally
come with a bunch of tips. That lets you “focus” the heat on the part you want
to pull.
One of an infinite number, randomly chosen:
On 10/31/20 4:46 PM, Bob kb8tq wrote:
Hi
Looking at the data sheet for the MCU, they really do want 24 MHz and that’s
about it. I suspect you would
do better to take your 10 MHz OCXO and run it into one of the frequency
converter chips to get the 24.
Then feed that into the board. One more
Sorry Bob. I meant to address this question to Paul.
"Things already accomplished by Chris in the wwvb AM receiver"
Is there a link to the AM receiver? Curious as to what that looks like.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB teensy BPSK early experiments
Bob,
"Things already accomplished by Chris in the wwvb AM receiver"
Is there a link to the AM receiver? Curious as to what that looks like.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB teensy BPSK early experiments
From: Bob kb8tq
Date: Sat, October 31, 2020
Jim
Thanks for the details. I took a serious look at popping the xtal out and
am afraid its a bit beyond me since there are 4 pads that need to be
heated. I have worked on very small stuff under the microscope. But this
seems problematic. I sort of thought all the bits would get upset. No free
Hi
Looking at the data sheet for the MCU, they really do want 24 MHz and that’s
about it. I suspect you would
do better to take your 10 MHz OCXO and run it into one of the frequency
converter chips to get the 24.
Then feed that into the board. One more chip, but you now don’t have a bunch of
Thanks, it is used by Middle and high schools across the country, tech schools
and many other businesses. The goal is to get kids excited about technology
but we find a lot of people just want to know more about a technology that
touches their everyday life. Glad you enjoyed it.
db
> On Oct
On 10/31/20 11:42 AM, Bob kb8tq wrote:
Hi
…..errr…..
Can you pull the clock oscillator off the Teensy board? (Yes, the soldering
iron would be involved).
Will the clock input to the MCU accept something like 10 MHz? If so solder
on a cable ….
At that point whatever the Teeny does is locked
Good suggestions. The Teensy runs at some 580 MHz. I thought on the crystal
I had seen something like 166. These things are seriously small. But the
schematic shows its 24 MHz.
Inside the teensy is a PLL that creates the high speed system clock. So
thats potentially a good answer. Use something
Great tutorial read on fiber in your website.
-=Bryan=-
From: time-nuts on behalf of The Fiber Guru
Sent: October 31, 2020 9:29 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Changes in commercial GPS clocks over the
Just a thought, Paul --
If the teensy can generate an output that is accurate but jittery, you
could use a simple PLL to lock a crystal to that with a time constant
that smooths out the jitter.
John
On 10/31/20 1:47 PM, paul swed wrote:
Hello to the group. Wanted to update the everyone
Hi
…..errr…..
Can you pull the clock oscillator off the Teensy board? (Yes, the soldering
iron would be involved).
Will the clock input to the MCU accept something like 10 MHz? If so solder
on a cable ….
At that point whatever the Teeny does is locked to the 10 MHz. If that comes
from one of
Hello to the group. Wanted to update the everyone thats interested in
what I have learned so far on the Teensy and audio codec. No complete
solution yet. Much of my experimentation and knowledge has come from Frank
and Chris, who built the complete wwvb AM time receiver. In addition
and important
Yes, prior to use of GPS to discipline the Local oscillator, telecom timing was
a “trickle down” topology where a cesium source in Kansas City was distributed
across the continent.
The cesium was the gold standard and as the timing signals cascaded to distant
geographical regions, it was
Also an interesting material when high thermal conductivity is considered
is boron nitride. It is around five times better than copper, comparable
to diamond and can be sintered to a ceramic material.
Of course the Wiedemann-Franz-Lorenz law doesn't apply here as it is a very
good electrical
Interesting list
https://thermtest.com/thermal-resources/top-10-thermally-conductive-materials
Enviado do meu iPhone
> Em 30 de out. de 2020, à(s) 23:57, Bruce Griffiths
> escreveu:
>
> Not true
> The Wiedemann-Franz gives the ratio of the thermal conductivity to electrical
> conductivity
Hi,
On 2020-10-30 21:37, The Fiber Guru wrote:
> During my telco career I was responsible for Network Synchronization and
> witnessed several generations of clock designs. Post-telco I now
> manufacture and sell Network synchronization systems. Here are a few
> observations from legacy and
And for the serious low-noise enthusiast, a side benefit of cooling to
cryogenic
temperatures like 15K or so is that the thermal conductivity of copper is
something
like 25X what it is at room temperature.
Dana
On Fri, Oct 30, 2020 at 9:11 PM Mark Sims wrote:
>
> And (if I remember the
21 matches
Mail list logo
