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d.i.y. Combined L-Band (23 cm) Helical Feed and Ku 0.4 dB LNBF for 120 cm Dish

The high-gain antenna on my space communications array is based on a Fortec Star 120 cm dish.  This is a high-quality, large dish designed for motorized FTA reception of analog, digital, and high-definition programs on Ku band satellites.  I built a feed that combines a KU band horn for free-to-air (FTA) satellite reception with a helical feed

 
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Posted to diyPhysics.com: d.i.y. GPS-Disciplined 10 MHz Standard + UTC Clock

Last week I posted detailed construction information for my rubidium atomic clock frequency reference.  Besides that unit, I also built a GPS-disciplined 10 MHz oscillator to serve as a secondary frequency reference, as well as a source of GPS NMEA data for my ham shack instruments that can use precise location and real-time-clock data (e.g.

 
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Posted to diyPhysics.com: d.i.y. 10 MHz Atomic Clock Frequency Standard Using Surplus Rubidium Oscillator

I just posted on www.diyPhysics.com  about my 10 MHz rubidium standard based on a surplus Efratom M-100.  It is a free-standing 10 MHz +/-5×10-11 frequency standard for frequency counters, as well as a precise calibration source. I use it to keep precise track of frequency when working on Earth-Moon-Earth (EME) communications, where even tiny errors in tuning

 
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d.i.y. Moon Camera for EME and Radio-Astronomy Mounted on Space Communications Antenna Array

Our space-communicationsantenna  array includes a camera that looks in the direction that the array is pointing.  This camera helps us check that we are aiming directly at the moon during EME attempts.  In addition, when it lets us see airplanes that may be the source of interfering signals when we conduct radio-astronomy observations.

 
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