Starting SDRAngel software on my ancient Dell M6800 black laptop
Admin
This laptop does not have the required graphics hardware for the program to start without crashing – the batch file below allows it to be started by forcing the program…
Can a loop antenna be designed to avoid polarisation?
Yes — but not with a single ordinary loop. A single loop always has a defined polarization response, so a signal with the “wrong” polarization can suffer a deep null.…
Andrew goes global! A humorous look at amateur radio astronomy
https://www.astronomy.me.uk/wp-content/uploads/2026/09/buckingham_yagi_farm_30_frames_two_thirds_speed.gif
Why do meteors detected by radio scatter appear not have Doppler shifts above 100 Hz but airplanes and satellites do?
If you mean rewrite the equations and symbols using only ordinary ASCII characters, here it is. The key point is that meteor scatter does have Doppler shift. But unlike an…
How can decibel levels by negative on data collection and analysis software in radio astronomy?
A “Decibel” represents the power to which 10 must be raised to equal the value & can be + – 0 + ( above 1 ) – ( below 1…
Leo Bodnor low jitter GPS-locked frequency clock source 1 Hz to 1.1 GHz output LE-1420
Configuration screen at LRO 30/8/2026: Information about the device & software/datasheet: I have recently acquired one of these to help me with interferometry. This device comes recommended by members of…
Alternative Radial Velocity Calculator to the Green Bank Observatory Radial Velocity Calculator
http://f4klo.ampr.org/vlsrKLO.php
What connector is used on FE-5650A rubidium time source?
Yes. The lower connector in your photograph is a 9-pin male D-subminiature connector, commonly called DB9/DE-9 male. So the mating connector you want for making a power lead is a:…
Why do sharks fin patterns of SIDs go up for some observers and down for others?
If by “shark-fin patterns” you mean the characteristic sharp rise/slow fall (or the reverse) seen in VLF SID recordings during a solar flare, the reason some observers see the fin…
Rubidium frequency standard arrives from China (purchased on Aliexpress).
This is used communications hardware. Hand-written on cardboard box is 10 MHz. THE FOLKOWING COMES FROM AN ANALYSIS OF THE PHOTOS ABOVE BY CHATGPT, AND REQUIRES CONFIRMATION EXPERIMENTALLY: You have…