Which makes it a whole lot more fun then the lazy person's GPSDO. It is
interesting to watch and listen. You do see things that are odd and
explained. But sometimes it makes no sense at all.
Omega was mentioned earlier. I barely started to tinker with it and they
killed it off. We had a large
Hi
You *are* talking about a 60 KHz sine wave when playing with WWVB. The
typical receiver had a fairly narrow passband. This generally was accomplished
with both high Q tuned circuits and a crystal filter. The typical antenna loop
antenna
also had a fairly high Q tune on it. Even if the signal
Burt
I like it the "thumpers". The really annoying chart recorders I tend to
disconnect. Imagine 2-3! I use a software recorder these days. Quite and
consumes 10 X the power but no actual paper. Can't find that anymore at a
price you might care to pay for.
My other favorite box is the Gertch RLF.
jimlux wrote :
> And, just as with Omega (10-15 kHz) the height of the ionosphere
> changes the effective height of the "waveguide" through which
> the surface wave propagates.
Exactly! Folks, this isn't simple "reflections" between the earth and
the ionosphere.
At VLF frequencies the
The 45 degree phase shift was a form of identification for WWVB and
also served as a marker for chart recorders. The shift occurred from
10-minutes past the hour until 15 minutes past the hour.
Before GPS came along, WWVB was my main frequency
standard/reference. I had two Gertsch RLF
Hal and Magnus its pretty interesting. WWVB is indeed a skywave behavior
further out and at night. It exactly behaves like LORAN C and DCF and
others. But during the day I think it generally behaves like ground wave
from what I have experienced. What seems to be interesting is that the day
to day
Hi
The height of the ionosphere changes night to day. That changes the effective
propagation distance. As the day/night (or night/day) transition point crosses
the
path between you and WWVB the two “modes” compete with each other. They
can do fun stuff like cancel out the signal entirely.
If
On 10/5/20 3:59 AM, Magnus Danielson wrote:
Hi,
On 2020-10-05 11:20, Hal Murray wrote:
On a WWVB setup you get 10’s of us ( yes microseconds) of movement at
sunrise and sunset. You get as much as 10us between day and night.
Somehow, I was thinking that WWVB was ground wave and wouldn't be
Hi,
On 2020-10-05 11:20, Hal Murray wrote:
>> On a WWVB setup you get 10’s of us ( yes microseconds) of movement at
>> sunrise and sunset. You get as much as 10us between day and night.
> Somehow, I was thinking that WWVB was ground wave and wouldn't be effected by
> changes in the height of
> On a WWVB setup you get 10âs of us ( yes microseconds) of movement at
> sunrise and sunset. You get as much as 10us between day and night.
Somehow, I was thinking that WWVB was ground wave and wouldn't be effected by
changes in the height of the ionosphere. Am I totally out of it, or is
That's a very old WWVB receiver!
* As you can see from that photo, that model was introduced before NIST was
created from NBS in 1988 (see the "NBS OUTPUT" BNC).
* The "WWVB Continuous Monitored" label appears to be a Tektronix internal
calibration sticker. You can see the Tek "bug" logo
Bill
Thats exactly why they showed up. Though I still tend to see silly prices.
Heck serious humor you still see the GOES satellite Truetime DC468s for
sale again at silly costs and thats been dead since 2001 or so. (Unless you
have a GOES simulator)
So you are right GPSDOs have taken their place
Hi
You *can* do all the work to get a WWVB based device running, it’s not
impossible.
Compared to a GNSS based device, the WWVB has a number of issues. The biggest
is the twice a day ionosphere based disruption. There is no practical way to
get around
that. The net result of the this and the
Is this why so many really high end devices are basically dumped on eBay
now? I wondered why SRS device was so cheap now considering price of the
SR620. It's too bad they don't work anymore. I'm sure when this happened
it was a HUGE let down to many here that were using them? What's the best
Agree with Bobs comment. The 180 degree phase flip killed all of the gear
unless significant mods are done or the d-psk-r is used. Great old boxes
though.
Regards
Paul
WB8TSL
On Sun, Oct 4, 2020 at 3:15 PM Bob kb8tq wrote:
> Hi
>
> This is another of the many devices out there that pre-date the
Hi
This is another of the many devices out there that pre-date the
“modern” 180 degree phase modulation approach on WWVB. Getting
one of these to run properly with the new modulation approach would take
some major mods …..
Bob
> On Oct 4, 2020, at 10:23 AM, Magnus Danielson wrote:
>
> Hi,
>
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