Attila Kinali writes:
> Not only did the US switch to
> digital cellphone systems about half a decade after Europe,
Dont just blame the telco's, both FCC, DOJ (on behalf of FBI) and
in particular NSA, exhibited olympic-class foot-dragging to keep the
air analog.
--
Poul-Henning Kamp
Was it related to the cause of the hump in the PN plot vs offset frequency that
the E1938A exhibits?
Bruce
> On 26/12/2021 17:56 Richard (Rick) Karlquist wrote:
>
>
> I'm sure I said that ... a long time ago. I can't remember now what the
> fix was, but I am fairly sure it would only apply
I'm sure I said that ... a long time ago. I can't remember now what the
fix was, but I am fairly sure it would only apply to phase noise at
more than 1 kHz offset. If anyone can jog my memory about it I might
be able to remember the details.
Rick N6RK
On 12/25/2021 2:09 PM, Stewart Cobb
On Sat, 25 Dec 2021 17:38:54 -0800
Steve Allen wrote:
> Did everyone involved in designing the hardware and software
> intend that phone to have precise time?
>
> https://www.jwz.org/blog/2010/07/what-at-t-doesnt-run-ntpd/
JWZ was/is US based. Cellphones developed in the US quite
differently
On Sun 2021-12-26T02:06:07+0100 Attila Kinali hath writ:
> Cellphone network time distribution is something rather new
> and didn't exist until EDGE (or was it HSDPA?) came along.
> But once it was available, it was "good enough", i.e. the
> time offset was low enough to be not perceivable
On Sat, 25 Dec 2021 15:27:51 -0800
Hal Murray wrote:
> How good are cell phones? I remember comments about them being way off. But
> that was a long time ago.
Cellphone network time distribution is something rather new
and didn't exist until EDGE (or was it HSDPA?) came along.
But once it
> The ES-192U/194U uses the AC line-frequency as a time reference
If you have one of those and you just plugged it in or want to check it, where
do you get the time?
How good are cell phones? I remember comments about them being way off. But
that was a long time ago.
If I was doing it now,
That was Quick.
Item was SOLD, less than 10 minutes after I posted.
greg
> From: Gregory Beat
> Date: December 25, 2021 at 4:22:37 PM CST
> To: time-nuts@lists.febo.com
> Subject: ESE ES-192UEP appeared on eBay
>
> eBay auction: 334262158114
> Auction item located in Sunnyvale, CA
> Decent
eBay auction: 334262158114
Auction item located in Sunnyvale, CA
Decent price for used. As usual, batteries in Rack Case should be changed
Contact ESE for full manual, with schematic and parts list (details on options).
Phone +1 310-322-2136
e-Mail: e...@ese-web.com
==
ESE celebrated their 50th
Rick Karlquist mentioned some time ago that the phase noise of the E1938A
could have been improved by a simple change, but the production managers
were unwilling to apply that change because there was no customer demand
for it.
What was that change, and is it feasible for a skilled hobbyist to
And given the age of many OCXOs it was sort of the tool of the time. There
really were not better devices in the 60s and early 70s.
Regards
Paul
WB8TSL
On Sat, Dec 25, 2021 at 11:43 AM Andy Talbot wrote:
> In the (very) few OCXO circuits I've seen, voltage at both ends of the
> tuning varactor
In the (very) few OCXO circuits I've seen, voltage at both ends of the
tuning varactor are derived from the same internal voltage reference. So
any drift in this will, partially at least, cancel out.I too was
surprised to see nothing more than a Zener being used in one case, but
bearing in
Being also a bit of a volt-nut, I played a bit with the Vref output
from some of my OCXO's and must sadly report that they were not
spectacular, seen from a volt-nut perspective.
In at least once case, an admittedly pretty old OCXO design, the
voltage reference was not located in the most
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