CM-4251 Parabolic+FBmod


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CM-4251 Parabolic+FBmod - Bigger 2-Bay

CM-4251 7-ft Parabolic Reflector + 4-Wire FBmod (Front/Back Ratio Mod) with two alternative mods:

a) Bigger 2-Bay Bowtie (Rescale Factor = 1.2), but same size Reflector Grid. [Easiest to build.]

b) Bigger 2-Bay Bowtie & Reflector Grid (Rescale Factor = 1.2) but NOT the Separation between them. [More difficult.]
For example see: http://s1286.photobucket.com/user/chapelrun/media/TEST2_zps5ebf36fe.jpg.html

c) Bigger 2-Bay Bowtie & Reflector Grid AND the Separation between them (Rescale Factor = 1.2). [Even more difficult.]

Date(s): 23 Mar 2013. Album by holl_ands. 1 - 27 of 27 Total. 5773 Visits.

enlarge 77KB, 709x1024 1 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid 3D View	enlarge 251KB, 984x1024 2 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid Front View [1 large square = 12.5 inches]	enlarge 146KB, 597x1024 3 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid Top View [1 large square = 12.5 inches]
enlarge 139KB, 603x1024 4 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid Side View [1 large square = 12.5 inches]	enlarge 334KB, 933x1024 5 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid Front View DETAILS [1 large square = 2.5 inches]	enlarge 95KB, 791x1024 6 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid 4nec2 File
enlarge 183KB, 1152x678 7 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid UHF Raw Gain = 19.6 dBi (Two Humps) Good F/B & F/R, except lower channels More mods to Parabolic Reflector should improve low freq Gain, F/B & F/R Ratios.	enlarge 193KB, 1152x678 8 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid UHF SWR (300-ohms) Under 2.5	enlarge 249KB, 1152x678 9 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, No change to Reflector Grid UHF Impedance
enlarge 88KB, 686x1024 10 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation 3D View	enlarge 257KB, 988x1024 11 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation Front View [1 large square = 12.5 inches]	enlarge 145KB, 599x1024 12 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation Top View [1 large square = 12.5 inches]
enlarge 139KB, 605x1024 13 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation Side View [1 large square = 12.5 inches]	enlarge 339KB, 900x1024 14 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation Front View DETAIL [1 large square = 2.5 inches]	enlarge 94KB, 791x1024 15 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation 4nec2 File
enlarge 190KB, 1152x678 16 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation UHF Raw Gain = 19.5 dBi (Two Humps) Good F/B & F/R, except lower channels More mods to Parabolic Reflector should improve low freq Gain, F/B & F/R Ratios.	enlarge 202KB, 1152x678 17 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation UHF SWR (300-ohms) Under 2.8	enlarge 246KB, 1152x678 18 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay, Refl. Grid & Separation UHF Impedance
enlarge 94KB, 687x1024 19 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change Separation 3D View	enlarge 251KB, 1009x1024 20 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change Separation Front View [1 large square = 12.5 inches]	enlarge 151KB, 618x1024 21 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change Separation Top View [1 large square = 12.5 inches]
enlarge 140KB, 607x1024 22 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change Separation Side View [1 large square = 12.5 inches]	enlarge 339KB, 1024x951 23 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change Separation Front View DETAIL [1 large square = 2.5 inches]	enlarge 93KB, 791x1024 24 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change 4nec2
enlarge 182KB, 1152x678 25 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change Separation UHF Raw Gain Max = 19.5 dBi	enlarge 203KB, 1152x678 26 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change Separation UHF SWR (300-ohm) Under 2.5	enlarge 250KB, 1152x678 27 CM-4251 Parabolic+FBmod 20% Bigger 2-Bay & Grid, No change Separation UHF Impedance

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