I connected the free twisted end of the short and long wires (the ground) the chassis wire (ground) of my homemade testing jig with alligator clip. It may not display this or other websites correctly. Clansman End Fed Long Wire Antenna Used. . Cannon". Attaching a counterpoise wire to the common point of the auto-transformer provides the antenna radiator something to push against rather than the coax shield. Because I had some spare Cu-Wire I wound another 1:49 Unun on a smaller FT-140-43 toroid and tried different capacitors between feedline and ground (to compensate for the 10m band). endobj Post Reviews | It's an efficient way to get all the multiples endobj 7 0 obj End Fed Antennas - Elgin Amateur Radio Society endobj stream https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. About Hamuniverse PDF Recommended wire lengths and Installation Notes for Unun models 4932 Power handling is 100 watts CW / SSB & 25W Data modes. Stacked coreswithwinding configured as 49:1auto transformer. 4 x 4 x 2 electrical junction box (available at big box hardware stores), One PVC DWV Test Cap (available at big box hardware stores in plumbing). Even better would be shortening to 53'. << It uses an FT140-43 or FT240-43 toroid in a 49:1 impedance matching unit at the base and a 110 micro Henry (H) coil to act as a loading coil for 80m and a choke to stop higher frequencies using the last 2m of wire. PDF Wire Lengths for 4 and 9-1 Ununs - Balun Designs Make sure the beginning few inches of twisted wire is not involved in the winding (i.e., just hanging down from the toroid). AndWhat Is It Used For In Antennas? Technical specification : Type : 49:1 Unun Frequency : 1.8 MHz - 7.3 MHz Turns ratio: 1:7 Impedance ratio: 1:49 Input Impedance: 50 Output Impedance: 2450 Power Handling (CW/SSB/ Digital Modes) : 2Kw of peak power / DM Modes 500 watts Core Type : 3 x FT240-43 by Fair-rite Co. Wire type: Enamel copper wire 2.0 mm (AWG 12) Assembled and tested. multiples, and of course different band combinations yield different