[Antennas] Re: Dummy Load ...is it still 50 Ohms

2004年4月29日 13:53:47 -0400

Before ANY thing else ....make sure it is still 50 Ohms ( under 40 ohms or
over 65 its useless .........
Some are going lower and others higher .
73
Yves Wn4i
----- Original Message ----- 
From: "Bob Nielsen" <[email protected]>
To: <[email protected]>
Sent: Thursday, April 29, 2004 11:37 AM
Subject: Re: [Antennas] What to put in a dummy load
> If you have a local livestock supply store, you will find mineral oil
> to be much less expensive there than at the drugstore.
>> Bob, N7XY
>> On Thu, Apr 29, 2004 at 01:03:27AM -0500, Herschel McCullough wrote:
> > Mineral oil , use it and forget all the rest of the exotic ones.. Your
> > drugstore has in .. Run it dry, sure for a short while.. Bird will be
most
> > happy to sell you the new diagraphams and seals, small price to pay to
have
> > a new sealed unit , that most likely will now out live you.. mac/mc
> >
> >
> > ----- Original Message -----
> > From: "Elliott Bill W Civ WRALC/MASTD" <[email protected]>
> > To: "'Jim Isbell'" <[email protected]>;
> > <[email protected]>
> > Sent: Wednesday, April 28, 2004 10:22 PM
> > Subject: RE: [Antennas] What to put in a dummy load
> >
> >
> > > Jim
> > >
> > > I had a Heath "Cantenna" many years ago. As I remember they listed an
oil
> > > you could use (I don't remember which that was), but, the recommended
> > > contacting the local power company and getting some transformer oil
from
> > > them. Most of the time they would donate a little for PR reasons,
and
> > they
> > > didn't have the procedures to charge for that sale anyway. This
> > > transformer oil could stand up to the requirements of heat transfer
> > without
> > > breaking down.
> > >
> > > Good luck on finding a friendly face at the power company.
> > >
> > > 73, Bill, KJ4O
> > >
> > > -----Original Message-----
> > > From: [email protected]
> > [mailto:[email protected]]
> > > On Behalf Of Jim Isbell
> > > Sent: Wednesday, April 28, 2004 22:14
> > > To: Mail list Antennas
> > > Subject: [Antennas] What to put in a dummy load
> > >
> > > I have a 200W dummy load that apparently once held oil. It is now
empty.
> > > At least that assumption is made on the basis that the bottom of the
> > > container has a bellows loaded bottom to allow for expansion. There
is
> > > no place to fill or drain it but I can cut a hole and add a filler cap
> > real
> > > easy. Once open I can check for leaks and repair them. OK, now what
is
> > the
> > > best thing to put in it...or does it really matter that much.....Corn
Oil
> > is
> > > cheap and readily available. Is there any real advantage to mineral
oil?
> > > Or is there any real advantage to some exotic concoction that I never
> > heard
> > > of. What about a fan and lots of air, and no oil at all.?
> > >
> > > - - -
> > >
> - - -
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