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  • A magnetics review of the VK3AMP Sontheimer directional coupler 03/03/2021
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  • Select a ferrite core material and sufficient primary turns for a low InsertionVSWR 50Ω broadband RF transformer – comparison of measured and predicted 26/02/2021
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  • A Smith chart should go round in circles 25/02/2021
  • Surely there cannot be more forward power than the transmitter makes? 25/02/2021
  • Select a ferrite core material and sufficient primary turns for a low InsertionVSWR 50Ω broadband RF transformer – nanoVNA – loss components graph 24/02/2021
  • A DIY thermostat based on the MS1230A controller 23/02/2021
  • Select a ferrite core material and sufficient primary turns for a low InsertionVSWR 50Ω broadband RF transformer – nanoVNA 23/02/2021
  • Phase of s11 and Z 21/02/2021
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  • The devil is in the detail… 19/02/2021
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  • Fox flasher MkII update 2/2021 18/02/2021
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  • Improving ‘s21 shunt-through’ measurement of low impedances 17/02/2021
  • Antenna system resonance and the nanoVNA 16/02/2021
  • Improving ‘s21 series-through’ measurement of high impedances – more detail 15/02/2021
  • Improving ‘s21 series-through’ measurement of high impedances 14/02/2021
  • Nichols: The Two Bird Experiment – a Simsmith model 12/02/2021
  • Calculate Loss from s11 and s21 – convenient online calculator 11/02/2021
  • Measure transmission line Zo – nanoVNA – PVC speaker twin 08/02/2021
  • Measure transmission line Zo – nanoVNA – CCS RG6 07/02/2021
  • Nichols: The Two Bird Experiment 07/02/2021
  • Conductors for a Guanella 1:1 balun – discussion 03/02/2021
  • The requisite knowledge does not come in the box 03/02/2021
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  • nanoVNA – measure Transmission Loss – example 5 30/01/2021
  • High voltage test of a couple of PTFE insulated silver plated copper wires 28/01/2021
  • An example and explanation of unexpected common mode choke flashover 28/01/2021
  • Mornhinweg ferrite core measurements – #61 27/01/2021
  • Using complex permeability to design with Fair-rite suppression products 27/01/2021
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  • KL7AJ on the Conjugate Match Theorem – analytical solution – Simsmith 09/01/2021
  • nanoVNA – measure Transmission Loss – example 3 08/01/2021
  • nanoVNA – measure Transmission Loss – example 2 07/01/2021
  • nanoVNA – measure Transmission Loss – example 1 06/01/2021
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Search Results for: end fed half wave

Wire dipole on 160m

Discussion with a correspondent recently ranged onto the effect of some conductor materials in antennas. This posting reports the feed point impedance and internal efficiency (meaning power not turned into heat in the structure divided by power input at the feed point) of a 160m half wave dipole (80m long, centre fed, 20m above average … Continue reading Wire dipole on 160m

Posted on 01/01/201408/11/2015Categories Amateur Radio, Antennas

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