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RadioJoe

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  1. Yet no response from OP Makarand My BIG Thanks go to the OP for rekindling a fire in this 'ole stove' Ed astro, re your ""SDR artifacts"" Thanks for the interesting technique Quite coincidental I was just reading about 'self calibration' = SELF CALF https://forge.oca.eu/trac/fitOmatic/wiki/self-cal ""Self-calibration is a method first developed in radio-astronomy to produce radio-interferometric images of an astrophysical object"" As Miguel_EA1HTA ... noted ... (and I paraphrase ** because this is true for me too**) **the redeeming factor is almost always the learning** while implementation comes later ... 72 73 John N3AAZ
  2. I notice Makarand's post Backyard Radio Telescope increased from 290 views to 442 since my Oct 26 reply I wonder if there is enough interest here to share "your" experience? John N3AAZ
  3. I found your call for help late but yet no reply form you so hope you have not deserted hi HI May I suggest a project that produces almost immediate results Radio Jove https://groups.io/g/radio-jove/topics Juipter was in opposition 220926 (September 26) https://stellarium.org/ a free open source planetarium for your computer !!opposition!! = Sun angle at 180 degrees... ...that is Earth is between Sun and Jupiter for best signal to noise observation And will stay close for several months (Stellarium) The project can be as simple as a home brew 20 meter dipole set up in special orientation and cut for 20.1 MHz has a length of 23.28 ft (23’ 3” or 7.09 m) as measured from tip to tip of the wire ...see Figure 3-1 here... (https://radiojove.gsfc.nasa.gov/radio_telescope/manuals/RJ_ant_manual_2.0.pdf) And I suggest start with a single element (just one dipole vs two) for your first telescope Two dipoles plus that delay line (special length of coax measured in wavelength degrees) makes the two element array steerable, so depending on you 'back yard' obstruction (if any) and elevation (Earth's latitude) you may choose to change or modify your second telescope elevation (height above ground) and lQQk angle (delay line length) for better observation You will also need... HF receiver that tunes 20.1 mHz and best if you can disable AGC PC with sound card for recording observations to apps such as https://www.audacityteam.org/download/ (free) Check out RSS (Radio-Sky Spectrograph) discussed on RadioJove link above Plus tons of other free apps on the web Again, this telescope project can be as simple (few $$) as home brew above ... or as complex (more $$) as a complete kit... https://radiojove.gsfc.nasa.gov/ https://radiojove.gsfc.nasa.gov/radio_telescope/manuals/ https://101science.com/radiojove.html Now for the gQQd stuff This HF radio telescope can be multi purpose such as target; 1) Solar storms 2) Solar gray line ('rise and 'set are very dynamic) https://en.m.wikipedia.org/wiki/Terminator_(solar)#: 3) Aurora (depending on your latitude for best dynamics) 4) The up comming Solar eclips (depending on your Latitude and Longitude )... https://hamsci.org/article/hamsci-use-grape-personal-space-weather-stations-study-2023-and-2024-solar-eclipses 5) My bucket list includes ... EME/echo (EarthMoonEarth) ... https://physics.princeton.edu/pulsar/k1jt/wsjtx.html yet just another 'facet' on this marvoules ham radio hobby Enjoy 73 John N3AAZ
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