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Antenna Insulators for LF-MF
- Calculations indicated that there was close to 35,000 volts present on the antenna during high power operation
post 14 Apr 2026
Antenna 136KHz Links →
LF station info
Transmitter 400W from 2xIRFP250 with LF DDS VFO, Receiver Icom IC-761 with 2x500Hz and 2x250Hz CW filters, TX antenna 135m long wire
Longwave equipment
Old Longwave equipment for 136kHz
Longwave my 136 kHz station
Primary 3.4 mH loading coild 1/3 way up the antenna,this coil improved my ERP signal about 4-5 dB
Longwave Station
The 136kHz signal is filtered by a very narrow 2-stage FET preselector using Q-multiplication feedback to increase the Q factor, its bandwidth is less than 200Hz
LF-Station
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Transmitter 400W from 2xIRFP250 with LF DDS VFO, Receiver Icom IC-761 with 2x500Hz and 2x250Hz CW filters, TX antenna 135m long wire
Old Longwave equipment for 136kHz
Primary 3.4 mH loading coild 1/3 way up the antenna,this coil improved my ERP signal about 4-5 dB
The 136kHz signal is filtered by a very narrow 2-stage FET preselector using Q-multiplication feedback to increase the Q factor, its bandwidth is less than 200Hz
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