There is a schematic here on the Extron uploaded by a TN member. The schematic
for the Extron looks looks dead simple that one could really just make a simple
3 channel with the included mods in the writeup, only problem is I don't see a
source for a CLC409 any longer, and I don't have the exper
Here are (some) answers to your questions. Using NTP to synchronize
time across all machines is the one which makes the most sense IMHO.
In the past I setup the NTP server architecture for a "megacorp" I was
working for, and I have replicated the same setup (at a much smaller
case) in my house. M
Hi David, I don't particularly trust NTP servers from pool.ntp.org (I
assume that is what you mean by "pool"), and I use public stratum-1
servers chosen from a public list. Of course I make sure that my usage
complies with the policies and terms of use for each server (some
allow regional use only,
Am 19.10.19 um 10:30 schrieb Bryan _:
There is a schematic here on the Extron uploaded by a TN member. The schematic
for the Extron looks looks dead simple that one could really just make a simple
3 channel with the included mods in the writeup, only problem is I don't see a
source for a CLC4
Hi David, I don't particularly trust NTP servers from pool.ntp.org (I
assume that is what you mean by "pool"), and I use public stratum-1
servers chosen from a public list. Of course I make sure that my usage
complies with the policies and terms of use for each server (some
allow regional use only
> With this setup you have no single point of failure, and even if the
> connection to internet fails, they can still provide time as they are peering
> and synchronizing with each other.
No, it doesn't work that way. You need connectivity to at least one stratum 1
server.
There is an option
extrons are dead simple. But to modify the unit say a 6 output amp RBG+S
then you have some 20-30 BNC nuts to take off. Fun.
So while you are hacking it you can also add more outputs. Most have the
holes. Add BNC and a chip R. Most of the Rs are on the back and no need to
take off the nuts. Just de
Take a look at vClock
https://voceware.co.uk/products-vclock.aspx
You could run on a surplus PC with a reliable NTP client. I like Tardis as
I can set the servers that it queries and set limits to the amount of
correction it applies so that it can compensate for PC RTC drift without the
risk tha
I think there may be some confusion due to similarity of names.
Extron apparently makes or made video gear.
Efratom made Rb sources and precision frequency distribution stuff.
I'd like to find info on the Efratom distribution system, and
specifically the "MBF" modules.
Ed
__
Hi
There is the “good old way” to keep the station clocks running right in a
non-profit radio station:
At some odd hour of the day, one day a week, the tech geek fires up
WWVB and pipes it into an audio trunk. He / she then wanders around with
a set of headphones. Each clock in the station gets
Hi,
A premise must be made to define the performance of these DAs as EXTRON can
be compared to those built for the distribution of reference frequencies.
The Extron is a very nice solution, certainly of modest price, but we must
consider that its performances are limited. This especia
On Sat, Oct 19, 2019 at 4:17 AM Hal Murray wrote:
>
> The crystal is a thermometer. On modern systems, the temperature depends
> on
> the workload as well as the air conditioning.
>
>
Off-the-wall thought : could you discipline a well-insulated raspberry pi
to NTP using heaters or workload to
Hi Perrier,
I would like to see that circuit -- divide by 1.5 -- also, thank you in
advance
Alex
73
KJ6UHN
On 9/19/2019 5:03 AM, B Riches via time-nuts wrote:
Hi Perrier,
I would appreciate the circuit. Thank you.
73,
Bill, WA2DVUCape May
On Wednesday, September 18, 2019, 10:11:02
"Of course this is why I am a time-nut :-)"
I might say you graduated from the Advanced class with honors :)
Didier KO4BB
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I have not been carefully following this thread, but it brings to mind
experiences with broadcast time systems 40 or 50 years ago.
Accurate time is critical for operating networks of stations as one second can
correspond to a loss of about three words. Digital displays were (are) OK for
engi
I've done some quick test.
Specimen is one of my Extron MDV3.Instruments used were
TruePosition based GPSDO producing 10MHz at 11.9dBmHP8644A producing 15MHz at
10dBmHP8591EM spectrum analyzer
HP437B power meter + 482A sensor
I connected 10MHz to OUTPUT port of Extron MDV3. Nothing was detecte
Thanks to Didier and his endless pations I have FA2 working on my $ 25 7 inch
RCA tablet . If unlike me you know what you are doing it takes less than a
minute
Bert Kehren
http://www.ko4bb.com/Android/USBLogger_v002.apk
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Hi
What is the objective?
If this is a setup to feed a bunch of RF test gear on a lab bench, that’s a
petty typical
thing for roughly 99% of the “need” out there. The gear sits there forever and
ever
connected to the end of the same piece of cable. It has a PLL of some sort
inside
the box to
Adrian Godwin writes:
> Off-the-wall thought : could you discipline a well-insulated raspberry pi
> to NTP using heaters or workload to modify its temperature ?
Yes you can, been doing that with four rasPi and two TinkerBoards for
quite a while now to run the XTAL at its turnover temperature (wh
On 10/18/19 12:20 PM, Eric Scace wrote:
I fear that I am developing a reputation for bringing to the list rather
oddball questions. In my rôle as agent provocateur, therefore, here is another
such problem.
Questions for you are at the end. Thanks for your thoughts,.
— Eric
I think
Hello David,
>>> I'm surprised you don't trust "pool" servers. My experience is that using
>>> the pool directive, and allowing NTP to expand its server list automatically
>>> to the maximum number of servers, gives good results usually with one of two
>>> servers at least being stratum-1 GPS-loc
Well, Lady Heather will do all that (plus handle time zones, DST, and
leapseconds). A Ras PI (even a Pi Zero) works very well. I have just added a
"radio station studio clock" display mode. This clock display is driven by the
system clock which is hopefully steered by NTP. Default update r
I'd definitely think so, good idea :-) . I've also seen some open
source projects which calibrate the PPM drift based on the measured
temperature either using the CPU's temperature measurement or a cheap
USB temperature ambient sensor, thus implementing some sort of
"software ovenization". Unfortun
The two real sources are ke5fx.com and EEVBLOG
ke5fx.com has the "official" fully blessed release. It is currently at v5.0
This package has the nifty installer program.
The EEVBLOG site
(https://www.eevblog.com/forum/metrology/lady-heather-v6-beta-for-windows-exe/msg1434005/#msg1434005)
h
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