Chireix-Mesny Zig-Zags (NO Reflectors)

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Chireix-Mesny Zig-Zags (NO Reflectors)

UHF Chireix-Mesny Zig-Zag Antenna Arrays (NO Reflectors) analyzed using 4nec2.
Henri Chireix's Canadian Patent CA285256A is dated 12 Apr 1928:
http://lost-contact.mit.edu/afs/club.cc.cmu.edu/usr/sdavis/pdfs/chireix-mesny.pdf

SRC presumes the two side-by-side Chireix Antennas are driven by two separate (synchronized) transmitters
to investigate how well it would perform without complications due to an interconnecting Feedline.
Because 4nec2 is normalizing Gain, the power increase due to two separate transmitters is not evident in the plots.
BTW: This arrangement was reportedly used in the early days of Radio.

TL1 investigates Transmission Feedline Type 1, which results in a best fit to a 75-ohm load.
TL3 investigates Transmission Feedline Type 3, which results in a best fit to a 150-ohm load and not quite as good to 300-ohm load.
All feedline wire segments in TL3 are 5.1-in long, maintaining 0.75-in spacing (easier to do in metal than in 4nec2!!!).

EDIT (3Sep2009): Analyzed 2x4Sq Feedline BEHIND Zig-Zags (TL3B) where it contributes to Max Gain in the FORWARD direction.

Date(s): 1Sep2009. Album by holl_ands. 1 - 31 of 31 Total. 15943 Visits.

enlarge 0KB, 500x1024 1 Chireix-Mesny Zig-Zag Array (SRC) - 3D View Presumably fed by two synchronized transmitters.	enlarge 0KB, 718x1024 2 Chireix-Mesny Zig-Zag Array (SRC) - Front View Presumably fed by two synchronized transmitters. [One small box - 1.0 inch]	enlarge 0KB, 260x1024 3 Chireix-Mesny Zig-Zag Array (SRC) - Top View Presumably fed by two synchronized transmitters. [One small box - 1.0 inch]
enlarge 0KB, 1024x819 4 Chireix-Mesny Zig-Zag Array (SRC) - UHF Raw Gain Presumably fed by two synchronized transmitters.	enlarge 0KB, 1024x819 5 Chireix-Mesny Zig-Zag Array (SRC) - UHF Raw Gain Best match is to 300-ohm load....each.	enlarge 0KB, 1024x819 6 Chireix-Mesny Zig-Zag Array (SRC) - UHF Impedance
enlarge 0KB, 580x1024 7 Chireix-Mesny Zig-Zag Array (TL1) - 3D View Transmission Feedline: Type 1	enlarge 0KB, 718x1024 8 Chireix-Mesny Zig-Zag Array (TL1) - Front View Transmission Feedline: Type 1 [One small box = 1.0 inch]	enlarge 0KB, 393x1024 9 Chireix-Mesny Zig-Zag Array (TL1) - Top View Transmission Feedline: Type 1 [One small box = 1.0 inch]
enlarge 0KB, 1024x819 10 Chireix-Mesny Zig-Zag Array (TL1) - UHF Raw Gain Transmission Feedline: Type 1	enlarge 0KB, 1024x819 11 Chireix-Mesny Zig-Zag Array (TL1) - UHF SWR Best match is to 75-ohm load, but stil high SWR.	enlarge 0KB, 1024x819 12 Chireix-Mesny Zig-Zag Array (TL1) - UHF Impedance
enlarge 0KB, 554x1024 13 Chireix-Mesny Zig-Zag Array (TL3) - 3D View Transmission Feedline: Type 3	enlarge 0KB, 751x1024 14 Chireix-Mesny Zig-Zag Array (TL3) - Front View Transmission Feedline: Type 3 [One small box = 1.0 inch]	enlarge 0KB, 369x1024 15 Chireix-Mesny Zig-Zag Array (TL3) - Top View Transmission Feedline: Type 3 [One small box = 1.0 inch]
enlarge 0KB, 1024x819 16 Chireix-Mesny Zig-Zag Array (TL3) - UHF Raw Gain Transmission Feedline: Type 3 Notice Very Flat Frequency Response....	enlarge 0KB, 1024x819 17 Chireix-Mesny Zig-Zag Array (TL3) - UHF SWR Best match is to 150-ohm load, under 3.6.	enlarge 0KB, 1024x819 18 Chireix-Mesny Zig-Zag Array (TL3) - UHF SWR Match not quite as good with 300-ohm load. Also under SWR of 3.6.
enlarge 0KB, 1024x819 19 Chireix-Mesny Zig-Zag Array (TL3) - UHF Impedance	enlarge 32KB, 791x1024 20 Chireix-Mesny Zig-Zag Array (SRC) - 4nec2 File Presumably fed by two synchronized transmitters.	enlarge 31KB, 791x1024 21 Chireix-Mesny Zig-Zag Array (TL1) - 4nec2File Transmission Feedline: Type 1
enlarge 0KB, 527x1024 22 Chireix-Mesny Zig-Zag Array (TL3B) - 3D View Transmission Feedline: Type 3B [BEHIND the Zig-Zags has higher Max Gain]	enlarge 0KB, 713x1024 23 Chireix-Mesny Zig-Zag Array (TL3B) - Front View Transmission Feedline: Type 3B [One small box = 1.0 inch]	enlarge 0KB, 403x1024 24 Chireix-Mesny Zig-Zag Array (TL3B) - Top View Transmission Feedline: Type 3B [One small box = 1.0 inch]
enlarge 0KB, 1024x819 25 Chireix-Mesny Zig-Zag Array (TL3B) - UHF Raw Gain Transmission Feedline: Type 3B [BEHIND the Zig-Zags has higher Max Gain]	enlarge 0KB, 1024x819 26 Chireix-Mesny Zig-Zag Array (TL3B) - UHF SWR Best match is to 150-ohm load, under 3.6.	enlarge 0KB, 1024x819 27 Chireix-Mesny Zig-Zag Array (TL3B) - UHF SWR Match not quite as good with 300-ohm load. Also under SWR of 3.6.
enlarge 0KB, 1024x819 28 Chireix-Mesny Zig-Zag Array (TL3B) - UHF Impedance	enlarge 32KB, 791x1024 29 Chireix-Mesny Zig-Zag Array (TL3) - 4nec2File Transmission Feedline: Type 3 [In FRONT of Zig-Zags has higher Gain at Hi/Lo Freqs]	enlarge 32KB, 791x1024 30 Chireix-Mesny Zig-Zag Array (TL3B) - 4nec2File Transmission Feedline: Type 3B [BEHIND Zig-Zags has higher Max Gain]
enlarge 0KB, 1024x696 31 Compare: 2x4-Square Chireix-Mesny w & w/o 13 Reflector Rods 4-Square Chireix with Screen Reflector CM4228 with Screen Reflector

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great work sir could i get a note pad copy of your NEC work and pfd are alittle errory
- wildwillie, Wed, 2 Sep 2009 5:36AM