Cables dor 10 mHz
I am driving a Flexradio 1500, Racal-Dana 1992 counter,
Advantest U3641 spectrum analyzer, and my new
HP 3586B+ selective level meter with the 10 mHz from
my Thunderbolt. I had been using some old Ethernet cables
to drive this lot until last weekend.
I noticed that WWV on 10 mHz was being swamped by
leakage from these old cheap cables. This weekend I
replaced the lot with fat instrumentation grade cables.
This appears to have prevented the Thunderbolt's 10 mHz
from messing with Boulder's signal.
--
Chuck Forsberg WA7KGX N2469R caf@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
10 mHz
Please use MHz ...
10 mHz is 10 milli-hertz, ie 1 cycle every 10 second.
An yes, ethernet not being coax cables, I'd expect them to act as
antennas quite a bit ...
Cheers,
Sylvain
I didn't know WWV transmits sub-audio.
-John
==============
I am driving a Flexradio 1500, Racal-Dana 1992 counter,
Advantest U3641 spectrum analyzer, and my new
HP 3586B+ selective level meter with the 10 mHz from
my Thunderbolt. I had been using some old Ethernet cables
to drive this lot until last weekend.
I noticed that WWV on 10 mHz was being swamped by
leakage from these old cheap cables. This weekend I
replaced the lot with fat instrumentation grade cables.
This appears to have prevented the Thunderbolt's 10 mHz
from messing with Boulder's signal.
--
Chuck Forsberg WA7KGX N2469R caf@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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Old ThinNet was coax, as was ThickNet before it. Only in the Modern Age
have they been using twisted pair. :)
On Mon, Jul 30, 2012 at 3:41 PM, Sylvain Munaut 246tnt@gmail.com wrote:
10 mHz
Please use MHz ...
10 mHz is 10 milli-hertz, ie 1 cycle every 10 second.
An yes, ethernet not being coax cables, I'd expect them to act as
antennas quite a bit ...
Cheers,
Sylvain
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On Mon, Jul 30, 2012 at 12:41 PM, Sylvain Munaut 246tnt@gmail.com wrote:
10 mHz
Please use MHz ...
10 mHz is 10 milli-hertz, ie 1 cycle every 10 second.
An yes, ethernet not being coax cables, I'd expect them to act as
antennas quite a bit ...
He said "old" Ethernet cables so I assume he meant 10Base2 cable which
is RG58 with BNC connections.
Or the even older 10Base5 cable. But the old 10Base5 would never
leak. It was made from RG8 but with an additional shield braid cover
and they never cut it, signals were taken with "vampire taps". Or at
the feed end where they used type N connections. I wonder how many
people here remember the old 10base5 stuff. We used to call it
"Frozen yellow garden hose". It was a perfect description. I think
it was about 1980. And I still remember being astounded when I saw
that a "vampire tap" could work.
In case anyone ever has a desire to run 10 Mhz sine waves over twisted pair Ethernet cables, I've had reasonably good success doing this using the Balun's sold for running composite video over twisted pair Ethernet cables.
My very anecdotal testing leads me to believe this works better than using junk grade no name RG58 coax.
--- On Mon, 7/30/12, Sylvain Munaut 246tnt@gmail.com wrote:
From: Sylvain Munaut 246tnt@gmail.com
Subject: Re: [time-nuts] Cables dor 10 mHz
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Received: Monday, July 30, 2012, 3:41 PM
10 mHz
Please use MHz ...
10 mHz is 10 milli-hertz, ie 1 cycle every 10 second.
An yes, ethernet not being coax cables, I'd expect them to
act as
antennas quite a bit ...
Cheers,
Sylvain
time-nuts mailing list -- time-nuts@febo.com
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and follow the instructions there.
Not only do i remember the frozen yellow hose, I still have my vampire tap drill/tool...now finding it may be another matter...:)
On Jul 30, 2012, at 18:53, Chris Albertson albertson.chris@gmail.com wrote:
On Mon, Jul 30, 2012 at 12:41 PM, Sylvain Munaut 246tnt@gmail.com wrote:
10 mHz
Please use MHz ...
10 mHz is 10 milli-hertz, ie 1 cycle every 10 second.
An yes, ethernet not being coax cables, I'd expect them to act as
antennas quite a bit ...
He said "old" Ethernet cables so I assume he meant 10Base2 cable which
is RG58 with BNC connections.
Or the even older 10Base5 cable. But the old 10Base5 would never
leak. It was made from RG8 but with an additional shield braid cover
and they never cut it, signals were taken with "vampire taps". Or at
the feed end where they used type N connections. I wonder how many
people here remember the old 10base5 stuff. We used to call it
"Frozen yellow garden hose". It was a perfect description. I think
it was about 1980. And I still remember being astounded when I saw
that a "vampire tap" could work.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Chris Albertson wrote:
... I wonder how many
people here remember the old 10base5 stuff. We used to call it
"Frozen yellow garden hose". It was a perfect description. I think
it was about 1980. And I still remember being astounded when I saw
that a "vampire tap" could work.
Or maybe more to the point, I wonder how many of us have installed
10base5 cable, and done vampire taps? I think I still have one of
the tools around here somewhere... probably with my G-D wirewrap
gun.
-Chuck Harris
Weird timing, I was digging through the attic and two weeks ago found
a box with AMP stinger repair kits, a couple unopened MAUs,
and at least one said tool or two in the bottom of the box. There use
to be a few N connectors but I still use them so they ended up in the
RF connector box.
I use to have a few spools of the cable but one ham radio swap meet
and they went fast.
One of MAUs is bigger then one of my Linux based single board
computers with a network jack ! And I bet cost more to buy.
-pete
On Mon, Jul 30, 2012 at 4:50 PM, Chuck Harris cfharris@erols.com wrote:
Chris Albertson wrote:
... I wonder how many
people here remember the old 10base5 stuff. We used to call it
"Frozen yellow garden hose". It was a perfect description. I think
it was about 1980. And I still remember being astounded when I saw
that a "vampire tap" could work.
Or maybe more to the point, I wonder how many of us have installed
10base5 cable, and done vampire taps? I think I still have one of
the tools around here somewhere... probably with my G-D wirewrap
gun.
-Chuck Harris
time-nuts mailing list -- time-nuts@febo.com
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Many years back I bought a long coil of the orange cable with N
connectors on it at a flea market. Only when I got home did I notice
that vampires had been gnawing on it in many places :-(
I should have known better and spotted the holes.
I'm pretty sure I know which box holds my vampire tool and a MAU or two,
but I worked for 3Com starting in 86.
On 7/30/2012 5:02 PM, Pete Lancashire wrote:
Weird timing, I was digging through the attic and two weeks ago found
a box with AMP stinger repair kits, a couple unopened MAUs,
and at least one said tool or two in the bottom of the box. There use
to be a few N connectors but I still use them so they ended up in the
RF connector box.
I use to have a few spools of the cable but one ham radio swap meet
and they went fast.
One of MAUs is bigger then one of my Linux based single board
computers with a network jack ! And I bet cost more to buy.
-pete
On Mon, Jul 30, 2012 at 4:50 PM, Chuck Harriscfharris@erols.com wrote:
Chris Albertson wrote:
... I wonder how many
people here remember the old 10base5 stuff. We used to call it
"Frozen yellow garden hose". It was a perfect description. I think
it was about 1980. And I still remember being astounded when I saw
that a "vampire tap" could work.
Or maybe more to the point, I wonder how many of us have installed
10base5 cable, and done vampire taps? I think I still have one of
the tools around here somewhere... probably with my G-D wirewrap
gun.
-Chuck Harris