-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I saw this 50 ohm "terminator" BNC connector at Radio Shack today and
was wondering if it could be used as an antenna dummy load? It is
designed as a computer network terminator - just a female jack without
any output connector. I believe the only question would be "Could it
stand the power output?" What if the output was just 5W? Anybody know
about this product or have used it as a dummy load?

It'd sure save the price of a "real" dummy antenna (it was priced about
$4.00 USD).

Thanks
--
MGFoster:::mgf00 at earthlink decimal-point net
Oakland, CA (USA)
** Respond only to this newsgroup. I DO NOT respond to emails **

-----BEGIN PGP SIGNATURE-----
Version: PGP for Personal Privacy 5.0
Charset: noconv

iQA/AwUBR48zz4echKqOuFEgEQJ4OwCeKdWRKG4P8cxND+FGxpF38I Syc+4AoNoU
T4vopRD2S1IPgrw9CO/dW50t
=TmNl
-----END PGP SIGNATURE-----

In article , MGFoster
wrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I saw this 50 ohm "terminator" BNC connector at Radio Shack today and
was wondering if it could be used as an antenna dummy load? It is
designed as a computer network terminator - just a female jack without
any output connector. I believe the only question would be "Could it
stand the power output?" What if the output was just 5W? Anybody know
about this product or have used it as a dummy load?

It'd sure save the price of a "real" dummy antenna (it was priced about
$4.00 USD).

Thanks

Hello, and I've got a whole box of these in my networking lab (from the
old 10Base2 days). A terminator certainly could be used as a dummy load
but I would probably keep the average RF power delivered it under 1 W.
Not sure how useful that would be even for a QRP setup. Sincerely, and
73s from N4GGO,

John Wood (Code 5550) e-mail:
Naval Research Laboratory
4555 Overlook Avenue, SW
Washington, DC 20375-5337

"MGFoster" wrote in message
...
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I saw this 50 ohm "terminator" BNC connector at Radio Shack today and
was wondering if it could be used as an antenna dummy load? It is
designed as a computer network terminator - just a female jack without
any output connector. I believe the only question would be "Could it
stand the power output?" What if the output was just 5W? Anybody know
about this product or have used it as a dummy load?

It'd sure save the price of a "real" dummy antenna (it was priced about
$4.00 USD).

Thanks
--
MGFoster:::mgf00 at earthlink decimal-point net
Oakland, CA (USA)
** Respond only to this newsgroup. I DO NOT respond to emails **

-----BEGIN PGP SIGNATURE-----
Version: PGP for Personal Privacy 5.0
Charset: noconv

iQA/AwUBR48zz4echKqOuFEgEQJ4OwCeKdWRKG4P8cxND+FGxpF38I Syc+4AoNoU
T4vopRD2S1IPgrw9CO/dW50t
=TmNl
-----END PGP SIGNATURE-----

Almost certainly, the power rating of the terminator is either 1/8, 1/4, or
1/2 W.

Tam/WB2TT

Tam wrote:
Almost certainly, the power rating of the terminator is either 1/8, 1/4,
or 1/2 W.

Does Radio Shack not specify the power rating?
--
73, Cecil http://www.w5dxp.com

"Cecil Moore" wrote in message
...
Tam wrote:
Almost certainly, the power rating of the terminator is either 1/8, 1/4,
or 1/2 W.

Does Radio Shack not specify the power rating?
--
73, Cecil http://www.w5dxp.com

Not in the catalog. Maybe on the bubble pack.

Tam/WB2TT

"Tam" wrote in
:


"Cecil Moore" wrote in message
...
Tam wrote:
Almost certainly, the power rating of the terminator is either 1/8,
1/4, or 1/2 W.

Does Radio Shack not specify the power rating?
--
73, Cecil http://www.w5dxp.com

Not in the catalog. Maybe on the bubble pack.

I dout they have a power rating on Digital line terminators! That isn't
one of the specs in common use in that field.

They aren't made for terminating much power at all.

As for the original question, they can be used as a terminator, but not
at the power levels we are likely to use, unless you are into QRPp.

- 73 de Mike N3LI -

"Cecil Moore" wrote in message
...
Tam wrote:
Almost certainly, the power rating of the terminator is either 1/8, 1/4,
or 1/2 W.

Does Radio Shack not specify the power rating?
--
73, Cecil http://www.w5dxp.com

Hey engineer! here is link:
http://www.caddock.com/Online_catalo...e/Current.html
MP9100
Dont lure good people to smacks shops! Just DIY!

On Sun, 20 Jan 2008 12:29:19 -0500, "Bob"
wrote:


"Cecil Moore" wrote in message
...
Tam wrote:
Almost certainly, the power rating of the terminator is either 1/8, 1/4,
or 1/2 W.

Does Radio Shack not specify the power rating?
--
73, Cecil http://www.w5dxp.com

Hey engineer! here is link:
http://www.caddock.com/Online_catalo...e/Current.html
MP9100
Dont lure good people to smacks shops! Just DIY!

Unlikely to be useful above the LW to AM band.

73's
Richard Clark, KB7QHC

On Jan 20, 10:15 am, Richard Clark wrote:
On Sun, 20 Jan 2008 12:29:19 -0500, "Bob"
wrote:



"Cecil Moore" wrote in message
...
Tam wrote:
Almost certainly, the power rating of the terminator is either 1/8, 1/4,
or 1/2 W.

Does Radio Shack not specify the power rating?
--
73, Cecil http://www.w5dxp.com

Hey engineer! here is link:
http://www.caddock.com/Online_catalo...e/Current.html
MP9100
Dont lure good people to smacks shops! Just DIY!

Unlikely to be useful above the LW to AM band.

73's
Richard Clark, KB7QHC

On the contrary, I've measured some of the Caddock resistors similar
to those and they're quite useful to 2 meters and beyond. We were
using a 100-ohm 25 watt one in a Wilkinson combiner at 450MHz
successfully. YMMV, and as I wrote in this thread before, it does
help to have a reliable analyzer to test them with. Much more useful,
IMO, than a lot of the drivel that goes on here would be info on ways
to bootstrap yourself into some decent measurements. It can be done
with very inexpensive home-brew equipment, but it takes some thought
and careful construction.

Cheers,
Tom

Richard Clark wrote:
On Sun, 20 Jan 2008 12:29:19 -0500, "Bob"
wrote:


"Cecil Moore" wrote in message
.. .

Tam wrote:

Almost certainly, the power rating of the terminator is either 1/8, 1/4,
or 1/2 W.

Does Radio Shack not specify the power rating?
--
73, Cecil http://www.w5dxp.com

Hey engineer! here is link:
http://www.caddock.com/Online_catalo...e/Current.html
MP9100
Dont lure good people to smacks shops! Just DIY!


Unlikely to be useful above the LW to AM band.

73's
Richard Clark, KB7QHC

Actually, those Caddock MP9 and MP8 non-inductive resistors are good to
HF (allowing for the physical size). The inductance of the big ones
(MP9100, 100W units) is about 20nH, about 3 ohms at 28 MHz. Half that
for the smaller ones. The challenge is in getting the heat away from
them. the thermal resistance of the MP9100 is 1.5 degrees/W, so at
100W, the resistor is 150 degrees hotter than the heatsink, and with a
max temp of 175C, you'd better keep that heatsink at 25C.