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question of use
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JW
electronics forum Guru Wannabe


Joined: 05 May 2005
Posts: 119

PostPosted: Fri Jul 21, 2006 9:56 am    Post subject: Re: question of use Reply with quote

On Thu, 20 Jul 2006 15:46:03 +0100 Mark Fortune <mark@fortrex.co.uk> wrote
in Message id: <44bf9716$0$9204$db0fefd9@news.zen.co.uk>:

[...]

Quote:
These were commonly used on Co-ax networks. You hardly see them used
since the introduction of Ethernet. If memory serves placing the cap on
the bnc connector on the computer directly is a way to tell the computer
that its not physically attatched to the network.. which would speed up
operation of the computer as it wont constantly be trying to see whats
out there on the network.

Actually, it's a terminator for the computer that sits at the end of the
Arcnet network cable.
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Robert Baer
electronics forum Guru


Joined: 25 Mar 2005
Posts: 1159

PostPosted: Fri Jul 21, 2006 5:43 am    Post subject: Re: question of use Reply with quote

clfe wrote:
Quote:
"Robert Baer" <robertbaer@earthlink.net> wrote in message
news:lzFvg.2243$157.269@newsread3.news.pas.earthlink.net...

clfe wrote:

I am curious, those 50 ohm terminators that Radio Shack sells/sold - for
terminating a computer under installation or repair - are they "really"
of any value? Does "anyone" use them?

I have probably close to half a dozen or more of them - new and I have no
use for them. Although, I've not looked at them up close as yet and am
wondering - if they "might" be usable at least for a low power dummy load
for a Ham Radio H.T. IF so, I "might" keep one or two....... So I guess
I'm asking too, what if any uses other than the intended use - has anyone
ever used these?

Thanks



50 ohm terminators for ??computers?? No way, unless there is a coax
ethernet adaptor card.


I'll look again, but I'd swear thats what the package said........... It is
a small BNC with a sealed cap on it. RS sells/sold them.


Yes, a BNC with a sealed cap could be either a 50 ohm terminator or a

75 ohm terminator.
But.
Not used on PCs except for coax ethernet cards.
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clfe
electronics forum beginner


Joined: 20 Jun 2006
Posts: 7

PostPosted: Fri Jul 21, 2006 12:47 am    Post subject: Re: question of use Reply with quote

"Sjouke Burry" <burrynulnulfour@ppllaanneett.nnlll> wrote in message
news:44c017b1$0$2017$ba620dc5@text.nova.planet.nl...
Quote:
clfe wrote:
I am curious, those 50 ohm terminators that Radio Shack sells/sold - for
terminating a computer under installation or repair - are they "really"
of any value? Does "anyone" use them?

I have probably close to half a dozen or more of them - new and I have no
use for them. Although, I've not looked at them up close as yet and am
wondering - if they "might" be usable at least for a low power dummy load
for a Ham Radio H.T. IF so, I "might" keep one or two....... So I guess
I'm asking too, what if any uses other than the intended use - has anyone
ever used these?

Thanks


I have used lots of them for ethernet
over 50 ohm coax termination

I'm not into that and as I said in a prior post, came across a handful -
just trying to figure out alternate uses if any.
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Sjouke Burry
electronics forum Guru Wannabe


Joined: 29 May 2005
Posts: 190

PostPosted: Thu Jul 20, 2006 11:54 pm    Post subject: Re: question of use Reply with quote

clfe wrote:
Quote:
I am curious, those 50 ohm terminators that Radio Shack sells/sold - for
terminating a computer under installation or repair - are they "really" of
any value? Does "anyone" use them?

I have probably close to half a dozen or more of them - new and I have no
use for them. Although, I've not looked at them up close as yet and am
wondering - if they "might" be usable at least for a low power dummy load
for a Ham Radio H.T. IF so, I "might" keep one or two....... So I guess I'm
asking too, what if any uses other than the intended use - has anyone ever
used these?

Thanks


I have used lots of them for ethernet

over 50 ohm coax termination
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Mark Fortune
electronics forum addict


Joined: 06 Jul 2006
Posts: 57

PostPosted: Thu Jul 20, 2006 2:46 pm    Post subject: Re: question of use Reply with quote

clfe wrote:
Quote:
"Robert Baer" <robertbaer@earthlink.net> wrote in message
news:lzFvg.2243$157.269@newsread3.news.pas.earthlink.net...

clfe wrote:

I am curious, those 50 ohm terminators that Radio Shack sells/sold - for
terminating a computer under installation or repair - are they "really"
of any value? Does "anyone" use them?

I have probably close to half a dozen or more of them - new and I have no
use for them. Although, I've not looked at them up close as yet and am
wondering - if they "might" be usable at least for a low power dummy load
for a Ham Radio H.T. IF so, I "might" keep one or two....... So I guess
I'm asking too, what if any uses other than the intended use - has anyone
ever used these?

Thanks



50 ohm terminators for ??computers?? No way, unless there is a coax
ethernet adaptor card.


I'll look again, but I'd swear thats what the package said........... It is
a small BNC with a sealed cap on it. RS sells/sold them.



These were commonly used on Co-ax networks. You hardly see them used
since the introduction of Ethernet. If memory serves placing the cap on
the bnc connector on the computer directly is a way to tell the computer
that its not physically attatched to the network.. which would speed up
operation of the computer as it wont constantly be trying to see whats
out there on the network. Then again, it can also serve as a dust cap.

Mark
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Thu Jul 20, 2006 2:28 pm    Post subject: Re: question of use Reply with quote

Robert Baer wrote:
Quote:

clfe wrote:
I am curious, those 50 ohm terminators that Radio Shack sells/sold - for
terminating a computer under installation or repair - are they "really" of
any value? Does "anyone" use them?

I have probably close to half a dozen or more of them - new and I have no
use for them. Although, I've not looked at them up close as yet and am
wondering - if they "might" be usable at least for a low power dummy load
for a Ham Radio H.T. IF so, I "might" keep one or two....... So I guess I'm
asking too, what if any uses other than the intended use - has anyone ever
used these?

Thanks


50 ohm terminators for ??computers?? No way, unless there is a coax
ethernet adaptor card.

You have never seen a network built that way? You use a tee
connector at every network card and a 50 ohm terminator at each end of
the network. There is no hub involved, and conflicts are handled by
multiple retries. It predates Cat 3 and Cat 5, but some networks still
use RG58 Thin Net.

As far as the terminators go, they can be used with test equipment,
but are only certified to 10 MHz for network use. Some are a lot better
than that, but some are real crap. It depends on the design and who put
them together. They are usually built with a 1/4 W resistor for network
use.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
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clfe
electronics forum beginner


Joined: 20 Jun 2006
Posts: 7

PostPosted: Thu Jul 20, 2006 12:47 pm    Post subject: Re: question of use Reply with quote

"Robert Baer" <robertbaer@earthlink.net> wrote in message
news:lzFvg.2243$157.269@newsread3.news.pas.earthlink.net...
Quote:
clfe wrote:
I am curious, those 50 ohm terminators that Radio Shack sells/sold - for
terminating a computer under installation or repair - are they "really"
of any value? Does "anyone" use them?

I have probably close to half a dozen or more of them - new and I have no
use for them. Although, I've not looked at them up close as yet and am
wondering - if they "might" be usable at least for a low power dummy load
for a Ham Radio H.T. IF so, I "might" keep one or two....... So I guess
I'm asking too, what if any uses other than the intended use - has anyone
ever used these?

Thanks


50 ohm terminators for ??computers?? No way, unless there is a coax
ethernet adaptor card.

I'll look again, but I'd swear thats what the package said........... It is
a small BNC with a sealed cap on it. RS sells/sold them.
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Robert Baer
electronics forum Guru


Joined: 25 Mar 2005
Posts: 1159

PostPosted: Thu Jul 20, 2006 6:40 am    Post subject: Re: question of use Reply with quote

clfe wrote:
Quote:
I am curious, those 50 ohm terminators that Radio Shack sells/sold - for
terminating a computer under installation or repair - are they "really" of
any value? Does "anyone" use them?

I have probably close to half a dozen or more of them - new and I have no
use for them. Although, I've not looked at them up close as yet and am
wondering - if they "might" be usable at least for a low power dummy load
for a Ham Radio H.T. IF so, I "might" keep one or two....... So I guess I'm
asking too, what if any uses other than the intended use - has anyone ever
used these?

Thanks


50 ohm terminators for ??computers?? No way, unless there is a coax

ethernet adaptor card.
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clfe
electronics forum beginner


Joined: 20 Jun 2006
Posts: 7

PostPosted: Thu Jul 20, 2006 5:15 am    Post subject: question of use Reply with quote

I am curious, those 50 ohm terminators that Radio Shack sells/sold - for
terminating a computer under installation or repair - are they "really" of
any value? Does "anyone" use them?

I have probably close to half a dozen or more of them - new and I have no
use for them. Although, I've not looked at them up close as yet and am
wondering - if they "might" be usable at least for a low power dummy load
for a Ham Radio H.T. IF so, I "might" keep one or two....... So I guess I'm
asking too, what if any uses other than the intended use - has anyone ever
used these?

Thanks
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