23 Jan
2018
23 Jan
'18
3:39 p.m.
From: Paul Koning
The nominal OD of RG-8/U is .. within spec for
Ethernet cable.
Oh, OK. I was just used to the 10Mb cable we used being slightly larger than
the 3Mb cable we used.
Also, Ethernet requires a solid inner conductor (for
the tap) while
RG-8/U may come stranded. (Maybe only in some variants, I'm not sure.)
As can be seen in the photos, the 3Mb stuff (at least, the stuff we used) was
also solid. The diameter of the center was a little smaller on the 3Mb than on
the 10Mb; .16mm versus .23mm; not sure if that was just happenstance, or what.
Noel
23 Jan
23 Jan
3:48 p.m.
On 01/23/2018 01:39 PM, Noel Chiappa via cctalk wrote:
As can be seen in the photos, the 3Mb stuff (at least,
the stuff we used)
was also solid. The diameter of the center was a little smaller on the
3Mb than on the 10Mb; .16mm versus .23mm; not sure if that was just
happenstance, or what.
That (and the OD) sounds like standard manufacturer to manufacturer
variation in different RG-8 grade cables that meet / fall within the
electrical / transmission / physical specifications of RG-8 cable.
I expect that the "yellow hosepipe" as I've heard the 10 Mbps coax
referred to as being a subset, possibly more stringent, of Radio Grade 8
coax cable.
--
Grant. . . .
unix || die
3:51 p.m.
A side story. I was the only 'customer' of a long run of that yellow cable,
when we moved the 260 + 3/50's to a different location, I asked
if they were going to reuse the cable. "Nope, cost to much to get it out of
the roof trusses." I forget but it was a LONG run. Tektronix
back in those days was still an engineering oriented company and all I had
to do was mention it one day in the main cafeteria. Next
thing I know I was followed back to the building with at least 10 engineers
following me. I called and asked one one the facility department
guys that knew about the cable no longer being used, and his reply was
something like if it not there Monday I know nothing about it.
The bottom of the trusses were a good 15 if not more feet up. Five of us
got it down and I came home with the cable on Sunday.
My helpers would not take anything in $'s, the challenge was good enough.
Make a great cable for my ham radio hobby.
Today one would never get away with such ....
-pete
On Tue, Jan 23, 2018 at 12:39 PM, Noel Chiappa via cctalk <
cctalk at classiccmp.org> wrote:
From: Paul
Koning
The nominal OD of RG-8/U is .. within spec for
Ethernet cable.
Oh, OK. I was just used to the 10Mb cable we used being slightly larger
than
the 3Mb cable we used.
Also, Ethernet requires a solid inner conductor
(for the tap) while
RG-8/U may come stranded. (Maybe only in some variants, I'm not
sure.)
As can be seen in the photos, the 3Mb stuff (at least, the stuff we used)
was
also solid. The diameter of the center was a little smaller on the 3Mb
than on
the 10Mb; .16mm versus .23mm; not sure if that was just happenstance, or
what.
Noel
4:06 p.m.
Nice story.
On 01/23/2018 01:51 PM, Pete Lancashire via cctalk wrote:
Today one would never get away with such ....
I don't know. I've had to mine out quite a bit of old cable that was
abandoned in place to make room for new installations. Frequently the
building owners were more than happy to see it disappear in a fashion
that meant that I didn't have to bill them for my time to pull it out.
Day 1: Man, we have to move get this crap out of the way so that we can
do our install.
Day 2: Meetings. (While interested parties pull out the cable and
leave a surprise.)
Day 3: Hay, I thought you said that we needed to mine something. I it
looks like clear haul. ...and someone left a pull string that we can
use. Suckers. ;-)
--
Grant. . . .
unix || die
4:23 p.m.
I hope they all weren't on that yellow cable. @60 devices on a single
collision domain would likely not have worked very well.
I also can't believe you used Ethernet RG8 for ham radio. I read the
spec and even tried some (I had reels of that stuff at one time) and
found it way too lossy even at HF frequencies. It was very low quality
RG8.
bill
KB3YV
________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Pete Lancashire via
cctalk <cctalk at classiccmp.org>
Sent: Tuesday, January 23, 2018 3:51 PM
To: Noel Chiappa; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Ethernet cable (Was: Sun3 valuations?)
A side story. I was the only 'customer' of a long run of that yellow cable,
when we moved the 260 + 3/50's to a different location, I asked
if they were going to reuse the cable. "Nope, cost to much to get it out of
the roof trusses." I forget but it was a LONG run. Tektronix
back in those days was still an engineering oriented company and all I had
to do was mention it one day in the main cafeteria. Next
thing I know I was followed back to the building with at least 10 engineers
following me. I called and asked one one the facility department
guys that knew about the cable no longer being used, and his reply was
something like if it not there Monday I know nothing about it.
The bottom of the trusses were a good 15 if not more feet up. Five of us
got it down and I came home with the cable on Sunday.
My helpers would not take anything in $'s, the challenge was good enough.
Make a great cable for my ham radio hobby.
Today one would never get away with such ....
-pete
On Tue, Jan 23, 2018 at 12:39 PM, Noel Chiappa via cctalk <
cctalk at classiccmp.org> wrote:
From: Paul
Koning
The nominal OD of RG-8/U is .. within spec for
Ethernet cable.
Oh, OK. I was just used to the 10Mb cable we used being slightly larger
than
the 3Mb cable we used.
Also, Ethernet requires a solid inner conductor
(for the tap) while
RG-8/U may come stranded. (Maybe only in some variants, I'm not
sure.)
As can be seen in the photos, the 3Mb stuff (at least, the stuff we used)
was
also solid. The diameter of the center was a little smaller on the 3Mb
than on
the 10Mb; .16mm versus .23mm; not sure if that was just happenstance, or
what.
Noel
4:42 p.m.
It was back in the days when $'s were very very tight, and I did 90% 80 and
40. Loss was greater but the cost was the major point.
On Tue, Jan 23, 2018 at 1:23 PM, Bill Gunshannon via cctalk <
cctalk at classiccmp.org> wrote:
I hope they all weren't on that yellow cable. @60
devices on a single
collision domain would likely not have worked very well.
I also can't believe you used Ethernet RG8 for ham radio. I read the
spec and even tried some (I had reels of that stuff at one time) and
found it way too lossy even at HF frequencies. It was very low quality
RG8.
bill
KB3YV
________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Pete Lancashire
via cctalk <cctalk at classiccmp.org>
Sent: Tuesday, January 23, 2018 3:51 PM
To: Noel Chiappa; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Ethernet cable (Was: Sun3 valuations?)
A side story. I was the only 'customer' of a long run of that yellow cable,
when we moved the 260 + 3/50's to a different location, I asked
if they were going to reuse the cable. "Nope, cost to much to get it out of
the roof trusses." I forget but it was a LONG run. Tektronix
back in those days was still an engineering oriented company and all I had
to do was mention it one day in the main cafeteria. Next
thing I know I was followed back to the building with at least 10 engineers
following me. I called and asked one one the facility department
guys that knew about the cable no longer being used, and his reply was
something like if it not there Monday I know nothing about it.
The bottom of the trusses were a good 15 if not more feet up. Five of us
got it down and I came home with the cable on Sunday.
My helpers would not take anything in $'s, the challenge was good enough.
Make a great cable for my ham radio hobby.
Today one would never get away with such ....
-pete
On Tue, Jan 23, 2018 at 12:39 PM, Noel Chiappa via cctalk <
cctalk at classiccmp.org> wrote:
From:
Paul Koning
The nominal OD of RG-8/U is .. within spec for
Ethernet cable.
Oh, OK. I was just used to the 10Mb cable we used being slightly larger
than
the 3Mb cable we used.
Also, Ethernet requires a solid inner conductor
(for the tap) while
RG-8/U may come stranded. (Maybe only in some variants, I'm not
sure.)
As can be seen in the photos, the 3Mb stuff (at least, the stuff we used)
was
also solid. The diameter of the center was a little smaller on the 3Mb
than on
the 10Mb; .16mm versus .23mm; not sure if that was just happenstance, or
what.
Noel
2406
days inactive
2406
days old
5 comments
4 participants
participants (4)
-
bill.gunshannon＠hotmail.com -
cctalk＠gtaylor.tnetconsulting.net -
jnc＠mercury.lcs.mit.edu -
pete＠petelancashire.com