On Jan 16, 5:14*pm, bpnjensen wrote:
On Jan 16, 1:34*pm, RHF wrote:
On Jan 16, 11:24*am, bpnjensen wrote:
Question to those who may have used one - Do inline isolators work
well on RX? *Such as those sold by Radioworks?
Thanks,
Bruce Jensen
BpnJ : Why are you considering an Inline Isolator ?
1st and "Inline Isolator" requires inserting something
'in-the-line' in the Antenna to Radio Feed-in-Line.
2nd the "Inline Isolator" requires two more Connections
{Joints} in the Antenna to Radio Feed-in-Line.
*If* Your Antenna to Radio Feed-in-Line is less that
150 Feet : Then most likely you do not need an
"Inline Isolator".
*If* Your Antenna to Radio Feed-in-Line is on-the-ground
or buried-under-the-ground a few inches : Then most
likely you do not need an "Inline Isolator".
However : If your Antenna to Radio Feed-in-Line is
In-the-Air {Overhead} from Tree to House : Then may
be you could use and *"Inline Isolator" at the House
entry-point with another Grounding Point/Ground Rod.
The "Correct Way" to Install a Longwire Antenna and Balun
by Wellbrook =http://www.wellbrook.uk.com/longwire.html
We have all most likely done it the wrong way more than once . . .http://groups.google.com/group/rec.r...5cc467b35a70d5
*.
*.
- Thanks - I see the Wellbrook diagrams. *Believe me, If I had the
- space, that's how I'd do it. *I have a tiny lot with the house
plopped
- right in the center, power lines fore and aft and neighbors by the
- bushel within a hundred feet. *My wire, by necessity, must go over
my
- rooftop. *In all other respects, it is built roughly as you see in
the
- "good" diagram.
-
- The isolator is a last resort.
BpnJ,
-alternative- Isolator 1:1 [UnUn] Matching Transformer
Wellbrook Antenna Feeder Isolator AFI 5030
http://www.wellbrook.uk.com/pdf/AFI5030A.pdf
http://www.wellbrook.uk.com/antennas...&product_id=56
BpnJ,
-alternative-loop-antenna-set-up-
Shortwave Listener [SWL] Loop Antenna with :
* Four Corners at/near the Lot Line; Centered
around the House.
* 21 Feet Long/Tall Top-Rail for the Four Corners
* Loop Antenna around the Four Corners
* Feed-in-Line from one of the Corners to the
House a few inches under-the-ground.
* Ground each of the pieces of Top-Rail and
place a Ground Rod at the Corner where the
Feed-in-Line comes in from.
* Matching Transformer [MT] -either-
* * MT Up-in-the-Air at the Top of the Top-Rail
* * MT On-the-Ground with 300 Ohm Twin-Lead
from the Loop Antenna Element down to the MT.
The Wire Loop Antenna Element should be 5 Foot
or more out and away from the House/Roof and help
to reduce the Noise Pick-Up from the House itself.
* 5 Foot is good
* * 10 Foot is Better {Twice as Good}
* * * * 20 Foot is GREAT {Four Times as Good}
BpnJ,
TEST : Your Present SWL Antenna when everyone
is away from the House for and overnight.
* Run your Radio/Receiver(s) on Batteries.
* Turn-Off your AC Mains : This Kills all AC Power
to the House -and- Kills all RFI coming from all
those Electrical-Electronic 'Gadgets' in the House.
* Listen to your Radio Overnight and see what you
can hear {RF Signals} and what you can not hear
{RF Noise}. All the other RF Noise is assumed to
be coming from your Next-Door Neighbors and your
nearby Neighborhood [One Block Around You].
* See 'if' you can pin-point any of these RF Noise
Sources coming from a specific Next-Door Neighbor.