Direction of movement and Doppler shift in radio frequencies
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In cosmology, a positive Doppler shift in radio waves means an object is moving away from us. This happens because the waves get redshifted — their wavelength stretches, and the…
2025
ChatGPT advice on how to look for cause of mal-performance on 1420MHz-tuned Yagi aerial 17/3/2025
1. Visual Inspection Check for: 2. Continuity and Resistance Testing Using a multimeter: 3. SWR Measurement Use an SWR meter or antenna analyzer at 1420 MHz: 4. Feedline Loss Test…
FITS Software
The following is an extract from https://fits.gsfc.nasa.gov/fits_viewer.html: FITS Image Software Packages for image viewing, analysis, and format conversion The following software packages display or manipulate the relatively simple class of…
Using TOPCAT Software for Windows to visualise and interpret SDFITS data (NASA single dish data format)
The SDFITS single dish data format (https://safe.nrao.edu/wiki/bin/view/Main/SdfitsDetails#:~:text=Briefly%2C%20SDFITS%20is%20a%20convention%20for%20storing%20single-dish,freedom%20to%20add%20any%20additional%20columns%20as%20necessary): The SDFITS convention was developed in the late 1980s. An early version was used in the UniPOPS data analysis program and it was…
M31’s Radial Velocity
For M31, Wikipedia gave the following: M31’s Radial Velocity: The Andromeda Galaxy (M31) is moving toward us with a radial speed of roughly 300 km/s. (Sometimes you’ll see a value around…
Calculator to determine Local Standard of Rest
https://www.gb.nrao.edu/cgi-bin/radvelcalc.py
Information on Ka-band from Wikipedia
The Ka band (pronounced as either “kay-ay band” or “ka band”) is a portion of the microwave part of the electromagnetic spectrum. The designation “Ka-band” is from Kurz-above, which stems…
Settings file for LRO-M1 Meteor Radio Scatter Experiment Spectrum Lab 15/3/2025
Click below to download file – ZIP file that needs to be unzipped to get USR file for Spectrum Lab: https://www.astronomy.me.uk/wp-content/uploads/2025/03/LRO-M1Speclab_Settings_FunCube-Dongle-Pro_150325.zip
M31 “Radio Map” using data from Green Bank 20m Radio Telescope 13/03/25
My first “map” of M31 – results of my first observing programme using the 20m dish at Green Bank Observatory. The spectra show a clear change in Doppler shift with…
Meteor Radio Scatter Conditional Actions File for Spectrum Lab Software used at LRO 14/3/2025
; Exported "Conditional Actions" for Spectrum Lab if( never ) then # ====== User definable options ====== if( never ) then # SNR_Threshold - Minimum SNR in dB to trigger…