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My colleagues Richard Mason G6HKS and Roger Banks GW4WND offer you a choice of either YAGI KITS OR READY TO ASSEMBLE ANTENNAS.
G4CQM's FLOWA YAGIS ARE CUTTING EDGE DESIGNS...
The FLOWA yagi has truly amazing properties, stability, bandwidth and polar pattern...It can be adapted into any role, it is well suited for EME and reducing local noise pickup...Checkout the CQM10UX and compare it to G0KSC's 8LFA which is identical in length. Unlike the LFA there is absolutely no matching used in the FLOWA!
See G4CQM's PowAbeam designs up against Cushcraft, M2, DK7ZB, YU7EF and G0KSC... COMPARISONS
SOUTHGATE AMATEUR RADIO NEWS - FLOWA PRESS RELEASE HERE
SEE THE CQM12UC IN LIONEL EDWARDS 2M BAND G/T TABLE
Seen below is the unique current distribution profile for the CQM15UC FLOWA, note the use of unconventional parasitic element spacing of D2, D3, D4 and D5 giving the appearance of two yagis in one...
POWABEAM FLOWA's & OWA's ARE TRUE 50-OHM BEAMS SO ABSOLUTELY NO MATCHING IS USED OR REQUIRED OF ANY KIND!...
SO THERE ARE NO MATCHING LOOPS OR FOLDED DIPOLES OR LOW IMPEDANCE DESIGNS...
WE ARE SECIALISTS IN VHF/UHF OWA's AND G4CQM INVENTOR OF THE FLOWA YAGI...
NEW 432MHz FLOWA's ARRIVE WITH UNPRECEDENTED STABILITY AND WIDE BANDWIDTH...
NEW FOR 2012 A LINE UP OF MY FLOWA (FLAT LINE OWA) [GAIN, F/R, VSWR & Z VIRTUALLY FLAT LINES]. THESE NEXT GENERATION POWABEAM ULTRA COMPACT OWA YAGI BEAMS USE UNCONVENTIONAL PARASITIC ELEMENT SPACING DELIVERING AMAZING VSWR BANDWIDTHS AND IMPROVED PERFORMANCE!
READY TO ASSEMBLE YAGIS WITH ROUND BOOMS FOR 2M AND 70CM
AND PRO HARDWARE
And Finally...
Thanks to David GI4SNA for making famous the 6M7N50 beam, enjoy the benefits of the 6CQM7C compact yagi beam
G4CQM's yagi designs are calibrated against NEC-2 for accuracy, all of the designs were conceived in K6STI's YO7 Professional software and scrutinized in 4nec2. They stand up to examination in any software package so .ANT and .nec files are included for this purpose. You can use for example AO (K6STI's Antenna Optimiser) or 4nec2 or Nec2Go which open the .ANT files directly. Thanks to Arie Voors and Pat W0OPW for making this possible.
NEC-2 IS USED FOR CALIBRATION AND ACCURACY IN THESE DESIGNS AS THERE ARE NO TAPERED ELEMENTS OR BENT WIRES PRESENT.
PowAbeam VHF (50 - 144MHz) yagis are designed with 25 segments per λ/2 and 11 at UHF (432MHz). However, a low to high value convergence test is applied to reveal accuracy and stability issues in each design in conjunction with a boom shortening test.
A simple split dipole is all that is required as the driven element. Use a balun if you so wish or better still a suitable ferrite slipped over the feeder close up to the feedpoint, see KB8RQ direct feed arrangement. However, the G4CQM 50Ω coaxial dipole provides an alternative and effective solution!
ALL DIMENSIONS ARE FREE-SPACE SO ELEMENTS NEED TO BE INSULATED FROM AND RAISED SUFFICIENTLY HIGH ABOVE THE BOOM TO AVOID BOOM CORRECTION!
73's de G4CQM
CALL DIRECT ON 0844 474 3419
G4CQM's PowAbeam Antennas by Derek Hilleard G4CQM - This website and contents are protected by international copyright law: Copyright © Derek Hilleard G4CQM 2011 All Rights Reserved
Email: derek.hilleard(at)g4cqm.co.uk
These yagi antenna designs are intended for commercial application and as such require a licence to be granted prior to commencement of production. Private experimenters are free to use these designs for their own personal enlightenment. However, no guarantee or warranty is offered or implied.
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