Antenna impedance matching - old Grundig tube receiver
 

First, I'm an absolute newbie.

I bought an old Grundig 2540 multiband receiver at an estate sale. It
works great, and I was even able to get a few shortwave stations with
the built in 12" piece of strip antenna.

So, now I want to try to make a wire antenna up in my attic. I can
probably make a 'rectangle' about 70 feet total length up there. My
question is, if I make this antenna, what is the best way to drop the
signal down into the house? I think I need to convert the long wire
into some sort of impedance match, for a coaxial feed to the room I
keep the radio in -- but on the back of the radio it has two spots for
an antenna connection: "FM" or "240 ohms"

So, what is the right way to do this? Is there such a thing as a 240
ohm balun that I'd put between the long wire and the coax?

Or something else?

Thanks a million for any help you can give me.

-Chris

Antenna impedance matching - old Grundig tube receiver
 

wrote:
First, I'm an absolute newbie.

I bought an old Grundig 2540 multiband receiver at an estate sale.

How old is "old?" Tube? Solid state? Does it come on as soon as you
turn on the on-off switch, or does it take about fifteen seconds to
warm up?

Antenna impedance matching - old Grundig tube receiver
 

wrote:
First, I'm an absolute newbie.

That's an advantage, as you have fewer preconceived notions.

I bought an old Grundig 2540 multiband receiver at an estate sale

Does it look like this?

http://radioatticarchives.com/images...540U_Jones.jpg

Tht's a handsome set. You might want to ask at
http://groups.google.com/group/rec.antiques.radio+phono
too, as it is old enough to be of interest to those folks.

Grundig has recycled the number 2540; it is now the model number for a
TV set.

Antenna impedance matching - old Grundig tube receiver
 

Beloved Leader wrote:
wrote:
First, I'm an absolute newbie.

That's an advantage, as you have fewer preconceived notions.

I bought an old Grundig 2540 multiband receiver at an estate sale

Does it look like this?

http://radioatticarchives.com/images...540U_Jones.jpg

Tht's a handsome set. You might want to ask at
http://groups.google.com/group/rec.antiques.radio+phono
too, as it is old enough to be of interest to those folks.

Grundig has recycled the number 2540; it is now the model number for a
TV set.

Yes, that's it. I was lucky enough to find one that had been kept on
display in the parlor for the last few decades -- so it is in pristine
condition. It's annoying that Grundig is using the model number again;
it complicates google searching a bit.

I'll check over in that other group as well, thanks for the pointer.

-Chris