All stations - Freienbach - Landschlacht

Solar Radio Flux by Christian Monstein

The solar radio noise is measured daily with amateur instrumentation, theat means I use an old communication receiver AR3000 modified
for radio astronomy purposes. The detector is composed of an analoge multiplier S042P (Siemens). The Yagi-antenna is a standard TV antennae (BIV/V)  for channel 37.
The antennae is fixed in meridian, but the elevation is  tilted once or twice per month according to the actual elevation of the suns orbit (Transit Meridian Instrument).
The receiver is programmable via RS232 with a Windows compatible PC running under XP and Borland Builder 6. This PC is also part of
the internal network, thus the data can be captured very easily. Every month a graph and a listing will be produced and stored in the archive below.

During 2019, after 23 years of observation local radio interference (due to DVB-T and mobile phone activity) went terribly strong and wide-band, such that solar flux observations went impossible. Observation of dynamic solar radio burst in continuing.

Actual measurements

Frequency agile solar radio spectrometer CALLISTO-01.
Frequency range 1110 MHz - 1750 MHz.
Antenna LPDA from Wittenberg company, Germany.

Frequency agile solar radio spectrometer CALLISTO-02.
Frequency range 10 MHz - 80 MHz.
Antenna BICONE from Schwarzbeck company, Germany.

Equipment:
Rack


Backend rack, hosting power supplies, CALLISTOs, front-end control-unit, GPS and computer. Rack can be closed by a metallic door to reduce self produce rfi.

Frontend
Focal plane unit containing calibration unit, band pass filter, low noise amplifier, isolator, mixer, local oscillator, low pass filter and driver electronics for microwave relais.
Antenna
LPDA LAT-50 from Wittenberg company, Germany. Gain 11 dB at 1420 MHz. Beam ~ 52° x 44°, max VSWR 1.6 between 700 MHz and 2800 MHz.