high performance rx antenna for a small lot - okdxf.eu · to a large and enthusiastic audience...
TRANSCRIPT
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High performance RX antenna for a small lot
Jose Carlos N4IS
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Receiver antennas for small lot
Basic concepts to receive weak signals
– Directivity & gain – RDF – Interaction and degradation – Urban noise – Receiver antenna definition
New olds receiver antennas
– Historic evolution – Single direction EWE FLAG DHDL – Rotatable antennas HWF VWF – High performance RX systems Dual DHDL; QDFA
RX antennas not sensible for man-made noise
– TX antenna interaction – Common mode noise – TX/RX leaking – Polarization filter HWF – Twisted pair lines – HWF single loaded loop construction – HWF dual loaded loop construction – Multiples loaded loops RX arrays –
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Basic concepts
Jose Carlos N4IS
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RX antennas directivity & gain
• It all about signal noise ratio • Minimum Detected signal “MDS”
Signal 30db above noise
Bandwidth
Noise floor
Signal at noise level
The ability to copy a weak signal depends mainly on the difference between the signal and receiver output noise
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• The gain is the difference between an amplifier input and output intensity. – Adding a 18 db gain amplifier, the signal and the noise will increase
18db and the signal noise still will be the same.
-38 dbm
-20 dbm
28 db SN
28 db SN
RX antennas directivity & gain
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40 db SN
30 db SN
1840 KHz carrier received with vertical TX antenna
Same signal received with a Big Waller Flag
RX antennas directivity & gain
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RX antennas directivity & gain
When the signal is above noise there is little difference on the audio. The receiver AGC will make the strong signal just more comfortable to copy but it should not be used for evaluation of the receiver antenna.
A good receiver antenna will provide copy of weak signals not present or buried in the
noise on the transmit antenna
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Directivity & RDF
Sinal de DX
QRN
QRM
QRN
QRN
QRM
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Sinal de DX
QRN
QRM
QRN
QRN
QRM
Directivity & RDF
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RDF
•RDF= Gain – Average Gain
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RDF for known antennas 5 dB
6 dB
7 dB
8 dB
9 dB
10 dB
11 dB
12 dB
VERTICAL 1/4
Inverted V 160m 40m de altura
Dipole 160m 20 m high
EWE 160m / 80m
Horizontal Flag single element
Flag vertical
DHDL
DHDL X Beverage 1 wave
Beverage 2 waves long
Waller Flag
180
40 25
10
Dipole Inverted V
HWF Beverage 1 wave
Waller Flag
Vertical
RDF
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8 dB
9 dB
10 dB
11 dB
12 dB
13 dB
14 dB
15 dB
RDF
4 square
Yagi - 2 elements
Quad - 2 elements Yagi - 3 elements
Yagi - 5 elements
2 Element vertical Horizontal HF
(PY2XB PY1RO)
HWF 3.5 MHz WF N4IS 160 80 40 m
3 x WF
4 x WF or EWE 4 x DHDL
RDF for known antennas
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Power line noise at home
N4IS
2 Km
5 Km 2,7 Km
s 2
s 9
s 7
( -73 dBm )
( -88 dBm )
( -77 dBm )
Noise during the day with no QRN - 90 dBm
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What we can really hear?
SSB 3 db 2,5KHz CW 0 db 100Hz
160 80 40 20
S 9
S 0
160 m 47 dBm 42 30 80 m 35 dBm 30 22 40 m 20 dBm 15 10
RECEIVER NOISE FLOOR
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New RX antennas
Jose Carlos N4IS
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1919 March 5, 1919, Roy A. Weagant, Chief Engineer of the Marconi Wireless Telegraph Co. of America, delivered a paper describing in detail his apparatus for the elimination of the great bug-bear of transoceanic wireless communication -- static interference. >> http://infoage.org/html/wa-1919-04-p11.html
1995 JF1DMQ wrote an earlier article about the Flag antenna in November 1995 in a Japanese magazine. His was only 3.3 feet by 16.4 feet long (1 by 5 m).K6SE's 160m optimized versions are 14 by 29 feet (4.3 by 8.8m).
1995 "Is This EWE for You?" (QST February, 1995, p.31) and "More EWES for You",
QST January, 1996, p. 32) both by WA2WVL.
1996 The Pennant was originated by EA3VY and optimized for 160 meters by K6SE, who first wrote about them on the Top Band Reflector in 1998
1997 The K9AY Terminated Loop—A Compact, Directional Receiving Antenna By Gary Breed, K9AY
1998 W7IUV rotatable Flag and preamplifier >> http://w7iuv.com/ 2000 QST Magazine, July 2000, page 34 for K6SE's classic article: "Flags, Pennants, and Other Ground-
Independent Low-Band Receiving Antennas" ...
2003 NX4D developed the first dual flag vertical array 2006 N4IS developed the BIG flag vertical array >> www.n4is.com
2008 N4IS developed the Horizontal flag array
2009 Dr Dallas Lankford, wrote the Flag Theory and design the Quad Flag Array >> http://www.kongsfjord.no/dl/dl.htm 2009 AA7JV George Wallner developed the DHDL (TX3A) >>
http://tx3a.com/docs/TX3A_DOUBLE_HALF_DELTA_LOOP.ZIP 2009 DOUBLING the Double Half-Delta Loop Receiving Antenna
by Pierluigi “Luis” Mansutti IV3PRK >> http://www.iv3prk.it/user/image/..-rxant.prk_tx3a.pdf
History of Flag RX antenna
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Flag evolution 1919
http://infoage.org/html/wa-1919-04-p11.html
To a large and enthusiastic audience composed of radio engineers and scientists of prominence, at a joint meeting of the Institute of Radio Engineers and the New York Electrical Society, held March 5, 1919, Roy A. Weagant, Chief Engineer of the Marconi Wireless Telegraph Co. of America, delivered a paper describing in detail his apparatus for the elimination of the great bug-bear of transoceanic wireless communication -- static interference.
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Antenas giratótias HWF VWF
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Flag EWE Delta Pennant etc.
+ Resistor and Transformer
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Two vertical in phase RDF = 8.25 dB
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EWE RDF = 7.02 dB
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Flag Array Dual Waller Flag
Resistor
Transformer signal
Two loops end fire
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Dual Half Dual Loop AA7JV
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Dual DHDL Quad WF
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QUAD DHDL and Quad WF
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Twisted pair
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Waller Flag feed system
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Transformer 9:1
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NX4D BIG Vertical Waller Flag
15 m
8 m
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N4IS Vertical Waller Flag VWF
15 m
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N4IS Horizontal Waller Flag HWF
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N4IS Horizontal Waller Flag HWF
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PY1RO single HWF
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PY1RO single HWF
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PY2XB Single HWF
HWF
50 MHz yagi
50 MHz yagi
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N8PR WF with polarization rotation.
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N2NL WF all PVC
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W8VVG WF
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TX3A ( AA7JV ) DHDL
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G0JHC DHDL
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N4IS all metal WF 2009
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New solution to fight power line
noise
Jose Carlos N4IS
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Polarization filter HWF
- 30 db
HWF
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Polarization filter HWF
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N4IS Horizontal Waller Flag 2012
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N4IS Horizontal Waller Flag 2012
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N4IS preamps
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RF CHOKE
http://audiosystemsgroup.com/publish.htm
http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf
http://audiosystemsgroup.com/RFIHamNCCC.pdf
Coaxial Transmitting Chokes Jim Brown K9YC
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AC filter at N4IS
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AC filter at N4IS
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Don’t need to move out in the woods, just improve your receiving system and enjoy the good stuff.