Time signal reception with a long-wire antenna and a PA0RDT mini-whip antenna. HP89410A analyzer set to 50 Ohm input, 100 Hz span, 1 Hz RBW. The signals are from:
LF time signals
Month: February 2017
Sunday Sub-2 ride: Watopia mountain route
I wonder if they archive results on Zwiftpower forever: http://www.zwiftpower.com/race.php?id=3614 ?
Group-ride on the zwift mountain route today.
PA0RDT Mini-Whip antenna
Antenna in a bottle installed on the roof today. Stay tuned for a future web-SDR...
An article, some theory, some notes on grounding, some comparisons,
There's also a modernized circuit by PA0NHC
BF998 active antenna preamp
Inspired by PA0NHC mini-whip, Jonathan Hare's Antennas for MSF 60 kHz LF, and Ferrite Sleeve Loop Antennas.
Seems to work quite well! This prototype shows about 140 pF of input(or parasitic) capacitance when the tuning capacitor is set to 0 pF. That could probably be improved on by better layout on a custom PCB.
136 kHz time-code received
Web-SDR located at Nastola
Time-code transmitter
RF power amplifier of DCF77 modulated time-code transmitter.