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S52AB - ERP measure on 473 kHz |
| TX Antenna on 480m. ASL; 7m up, 27m. long (inv.V) ANT wire Alu 6mm
diameter TX: 21 W , measure with HP 435A & power sensor HP8483A Antenna current with top hat coil 1.2 A RF (measure with thermo couple Am.) Increase the level of ERP with coil, is around 60 % TX antenna radiation efficiency is then 0.16/21*100=76% taking into account gain of 3 (4.8dB) for short monopole on perfect ground. The biggest unkown in this calculation in the RX loop antenna factor (value used is -41,6dB) Measure with W&G SPM3 – Z/om: 0 dB = 0.775V, 75om RX Antena is 1m. diameter non-resonant loop made with RG213 coax cable |
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ERP: 7 loc. 0.24W / loc.: 3-4-5-6 = 0.16W-this is probably the real value |
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