Balun for "F"type Connectors??????
 

wrote:
I have a reciever that has 2 screw antenna connections, 300 ohm. I
currently use RG-6 coax so I use a 4:1 matching tranformer at my
reciever and also at the Windom antenna in the attic.

I would like to setup a 90 ft random wire antenna outside using the
RG-6 and feed thru a ground block to the matching transformer into my
reciever. I'll need a 9:1 balun at the feed, but have not found a
ready made balun that accepts the "F" type coax connector. The ICE-180
and one currrently on eBay use a SO-239 connector and I have not found
connectors available to adapt to the RG-6.

Does any one know of a 9:1 Balun that accepts the "f" type connector?

Brian

300 ohms for an HF radio?

For many reasons I doubt that.

Common balanced impedances are 150, ~450 and I have seen a few 600 Ohm
RF devices.

300 would be extreme to the limits.

What type receiver is this?

Terry

Balun for "F"type Connectors??????
 

300 ohms for an HF radio?

For many reasons I doubt that.

Common balanced impedances are 150, ~450 and I have seen a few 600 Ohm
RF devices.

300 would be extreme to the limits.

What type receiver is this?

Terry

It is a Realistic DX-160. I had this model as a kid and saw the DX-160
on eBay near by and bought it.

Brian

Balun for "F"type Connectors??????
 

wrote:


300 ohms for an HF radio?

For many reasons I doubt that.

Common balanced impedances are 150, ~450 and I have seen a few 600 Ohm
RF devices.

300 would be extreme to the limits.

What type receiver is this?

Terry

It is a Realistic DX-160. I had this model as a kid and saw the DX-160
on eBay near by and bought it.

The stuff I've seen on it indicates a 50 Ohm input impedence.

dxAce
Michigan
USA

Balun for "F"type Connectors??????
 

dxAce wrote:
wrote:


300 ohms for an HF radio?

For many reasons I doubt that.

Common balanced impedances are 150, ~450 and I have seen a few 600 Ohm
RF devices.

300 would be extreme to the limits.

What type receiver is this?

Terry

It is a Realistic DX-160. I had this model as a kid and saw the DX-160
on eBay near by and bought it.



The stuff I've seen on it indicates a 50 Ohm input impedence.

dxAce
Michigan
USA

For the fun of it I will remove my 4:1 matching transformer between the
coax and the reciver connections and connect the coax right to the
screw terminals and see what happens.

Thanks
Brian

Balun for "F"type Connectors??????
 

wrote:
dxAce wrote:
wrote:


300 ohms for an HF radio?

For many reasons I doubt that.

Common balanced impedances are 150, ~450 and I have seen a few 600 Ohm
RF devices.

300 would be extreme to the limits.

What type receiver is this?

Terry

It is a Realistic DX-160. I had this model as a kid and saw the DX-160
on eBay near by and bought it.



The stuff I've seen on it indicates a 50 Ohm input impedence.

dxAce
Michigan
USA

For the fun of it I will remove my 4:1 matching transformer between the
coax and the reciver connections and connect the coax right to the
screw terminals and see what happens.

Thanks
Brian

That's weird I didn't notice any difference in radio reception at all
between the straight coax feed or thru the 4:1 matching transformer.

Brian

Balun for "F"type Connectors??????
 

wrote:
That's weird I didn't notice any difference in radio reception at all
between the straight coax feed or thru the 4:1 matching transformer.

I've read more and I'm really confused. A 90 foot random wire is unbalanced.
A DX-160 with a coax input is unbalanced. What's the balun for?

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM
IL Voice: (07)-7424-1667 Fax ONLY: 972-2-648-1443 U.S. Voice: 1-215-821-1838
Visit my 'blog at http://geoffstechno.livejournal.com/

Balun for "F"type Connectors??????
 

Geoffrey S. Mendelson wrote:
wrote:
That's weird I didn't notice any difference in radio reception at all
between the straight coax feed or thru the 4:1 matching transformer.

I've read more and I'm really confused. A 90 foot random wire is unbalanced.
A DX-160 with a coax input is unbalanced. What's the balun for?

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM
IL Voice: (07)-7424-1667 Fax ONLY: 972-2-648-1443 U.S. Voice: 1-215-821-1838
Visit my 'blog at http://geoffstechno.livejournal.com/

I'm getting more confused the more I read replies and on the net and
I'm starting to wonder also.

But my reasoning is... I thought the input impedance of the reciever
at the terminals was 300 ohms. I am using a 4:1 matching transformer
at the antenna (currently a 70ft windom) to feed into 75 ohm RG-6 coax.
The 4:1 matching transformer at the reciever was to return the input
to 300 ohms.

I'm going to do some more reading up on this.

Brian

Balun for "F"type Connectors??????
 

dxAce wrote:
wrote:


300 ohms for an HF radio?

For many reasons I doubt that.

Common balanced impedances are 150, ~450 and I have seen a few 600 Ohm
RF devices.

300 would be extreme to the limits.

What type receiver is this?

Terry

It is a Realistic DX-160. I had this model as a kid and saw the DX-160
on eBay near by and bought it.

The stuff I've seen on it indicates a 50 Ohm input impedence.

dxAce
Michigan
USA

Thanks dxAce

I did some digging and the DX-160 definitely has a low impedance
antenna input.
I was under the impression that it was 300 ohm.
I removed the 4:1 matching transformer that I installed at the reciever
which would bring the input back to about 75 ohms and saw no difference
in the signal so it may not be that important anyways in a recieve only
setup.

Not that I doubted you. :)

Brian