Weather
It's raining, it's pouring...
NOAA APT Satellites
The NOAA weather satellites are some of the easiest satellites to receive. For an excellent article see RTL-SDR Tutorial: Receiving NOAA Weather Satellite Images.
The NOAA satellites and APT frequencies are:
Satellite FrequencyNOAA 15 137.6200 MHzNOAA 18 137.9125 MHzNOAA 19 137.1000 MHz
The recommended steps are:
- Install WXtoImg
- Install a virtual audio cable (VAC), either VB-Audio or Virtual Audio Cable
- Select this device in the console (Receive DSP pane) and
- WXtoImg recording Options
- In the satellite tracking window select a NOAA satellite (see the table above),
- Add to the satellite list
- Define the RX frequency with the Organise option
- in the Passes window press Current to display the passes for the currently selected satellite
An example of a APT frequency definition is shown below, note the mode is WFM (wide FM) which must be used here, the recommended filter width is 40 kHz:
When applied to the console the Receive DSP pane shows the values below, make sure:
- Mode is WFM (wide FM)
- Virtual Audio Cable (VAC) is selected
- Volume level is 100
- Filter width is 40 kHz
- Squelch is Off
- Notch filter is off
WXToImg Settings
The essential WXtoImg steps are shown below.
Recording Options
From the Options menu select Recording Options. Here you must select the same virtual audio cable configured in the SDR Console, in this example Line 1 (Virtual Audio Cable). The name depends on the VAC program you have installed. You must select the same device in the Receive DSP pane of the console.
APT Signal And Image
Antennas
For general-purpose satellite reception a log periodic from WIMO is used, see http://www.wimo.com/logarithmic-periodic-vhf-antennas_e.html
model FULL. Here are a couple of photos, the rotator is an alfaSPID with Green Heron controller, the masthead pre-amp from SSB Electronics is the LNA 5000.