Antennas, active and passive
Steve
(http://www.aoruk.com/direct/la350.htm) that outperforms every wire
antenna I construct outside, including the last one, which is over 100
feet in length using a matching transformer and coaxial feed.
Either this is one hell of an active loop or I really stink at
building antennas! I think I'm beginnning to see why some people
become loop fanatics.
Steve
Steve
RHF
= = = news:<b55fd5d5.04101...@posting.google.com>...
STEVE,
OK - Your really really 'stink' at building antennas (Just Joking :o)
Re-Think your 100 Foot Random Wire Antenna.
- Consider an Inverted "L" Antenna with a 25 Foot Vertical Leg
and a 75 Foot Horizontal Arm.
- Or, if you want some 'specific' Numbers for a not so
'random wire' Antenna then use these two numbers:
- Length of Vertical-Leg Cut To:
= 32.5 Ft 1/2WL 19M / 28.4 Ft 1/2WL 16M / 23.2 Ft 1/2WL 13M
- Length of Horizontal-Arm Cut To:
= 63.6 Ft 1/4WL 75M / 51.2 Ft 1/4WL 60M / 41.5 Ft 1/4WL 49M
TIP: Plan and Write-It-Down:
- Plan Before You Buy or Build
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/1458
- Our Memories are Poor-Recorders-of-the-Facts:
Using Your ANTENNAS Journal-Ledger
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/594
FIRST - Make it a "Low Noise" SWL Antenna.
The "LOW NOISE" Antenna is basically a Random Wire Antenna
Element coupled via a 10(9):1 Matching Transformer at the
Near-End of the Antenna with a Ground Rod and Coax Cable
Feed-in-Line to the Receiver. This is the basic SWL Antenna
that uses the "Low Noise Antenna" 'design concepts' that were
popularized by John Doty.
- Low Noise Inverted "L" Antenna - Another Look
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/951
- Low Noise "SWL" Antenna for the Kenwood R-5000
[NO Antenna Tuner Required]
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/1525
CONSIDER BUILDING A "LOW NOISE" ANTENNA:
Try building an Improved SWL Random Wire Antenna that uses a
10(9):1 Matching Transformer (Balun / MLB) then you may not
see any real 'improvement' in the level of your receive signal;
but a great improvement in your Signal-to-Noise Ratio.
This is the so called "Low Noise" SWL Antenna.
Three "Must" Links to Read -wrt- Low Noise SWL Antenna
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/949
[ Please READ These Three Links ]
http://www.anarc.org/naswa/badx/antennas/low-noise_antenna.html
http://www.anarc.org/naswa/badx/antennas/SWL_longwire.html
http://www.anarc.org/naswa/badx/antennas/grounding.html
SECOND - The Wire Antenna Element.
http://www.radioworks.com/cwire.html
- "Flex-Weave" Antenna Wire {My Choice}
http://www.radio-ware.com/products/fw.htm
- "QuietFlex" Antenna Wire
http://www.antennasmore.com/wire&.htm
THIRD - Use a Matching Transformer {Magnetic Longwire Balun "MLB"}
that is specifically designed for a SWL Random Wire Antenna.
- Two Shortwave Listener (SWL) 10:1 Baluns for Random Wire Antennas
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/1528
- The Binocular [Ferrite Core] Matching Transformer {Balun]
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/518
- Balun Reading List ( Long )
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/337
FOURTH - Grounding-Point that is removed from your house/building.
- Locate your Ground Rod at the 'base' of your Antenna's
Vertical Down Leg. Have your Ground Rod extend about One Foot
(1 Ft) out of the Ground and "Mount" your Matching Transformer
'directly' to the Ground Rod.
READ - These Three Posts:
- An OutSide Ground for Better Safety and more . . .
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/206
- The "Grounding-Point" = Ground Rods and Ground Wires ETC.
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/425
- The "Primary" Antenna Grounding Point and the 'secondary'
Shack Grounding Point
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/503
- Grounds & Grounding = Five Topics for your Consideration
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/539
- Ground Rods The Easy (and cheap) Way
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/746
FIFTH - Coax Cable Feed-in-Line
- Route your Coax Cable from the 'junction' of the Ground Rod,
Matching Transformer and the Antenna Wire Element along the
Ground or buried under the ground to your house/building and
then up to your radio. Use a 'quality' Coax Cable like RG8(Mini)
or a RG6 Quad-Shield.
READ - "The Perfect Feedline for Wire Antennas" - by John Doty
http://www.hard-core-dx.com/nordicdx/antenna/feed/feed1.html
'other' Coax Cable INFO Links:
http://www.signalengineering.com/ultimate/coax_basics.html
http://www.radiobooks.com/rwcoax.htm
http://www.radioworks.com/ccoax.html
http://www.packetradio.com/cabltabl.htm
http://www.radioworks.com/ccoaxstd.html
http://www.hometech.com/techwire/coax.html#ht
http://www.universal-radio.com/catalog/cable/coax.html
http://www.davisrf.com/ham1/coax.htm
http://www.grove-ent.com/COAXCABLE.html
http://www.belden.com/
- Coax Cable and Line Loss Calculator
http://www.ocarc.ca/coax.htm
iane ~ RHF
.
Some Say: On A Clear Day You Can See Forever.
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/502
I BELIEVE: On A Clear Night . . .
You Can Hear Forever and Beyond, The Beyond !
.