What connector is used on FE-5650A rubidium time source?
Admin
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:…
Hardware
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…
How do you check rubidium source gets rubidium lock?
For a rubidium frequency standard, there are usually two separate things to check: On most rubidium modules, the best indication is a dedicated LOCK / UNLOCK / STATUS output. After…
Trimble and Leo Bodnar external RF clocks: Do they produce sine wave or square wave outputs?
TRIMBLE EXTERNAL CLOCKS: It depends on the specific Trimble device. For Trimble GPS-disciplined oscillators (GPSDOs) commonly used as 10 MHz frequency references: If you mean one of the surplus Trimble…
LBE-1420 GPSDO locked clock source : Leo Bodnar Electronics
This is an example of a clock source which can be used with SDRs that will accept external clocks for e.g. pulsar observations – the recommendation was made by a…
What is the ideal length of a piece of box section to make a homemade WR650 waveguide for hydrogen line work?
For a hydrogen-line feed made from rectangular box section, the waveguide only needs to be long enough to establish the TE10 mode and accommodate the probe/backshort arrangement. A useful rule…
How well would 150mm x 50mm aluminium box section work to manufacture a WR650 waveguide for hydrogen line radio astronomy? What other commonly available sizes could be used to manufacture homemade WR650 waveguides?
Dimensions of WR650 waveguide for hydrogen. For the neutral hydrogen line at 1420.4058 MHz, WR-650 is the standard rectangular waveguide size most commonly used. Its dimensions are: Dimension Inches Millimetres…
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
The gain of a hydrogen horn or dish depends on its aperture which makes sense as bigger aperture means more light collected. But how does this work with a Yagi antenna tuned to hydrogen?
A Yagi works by a different mechanism from a dish or horn, but the same underlying principle still applies: For any antenna, gain and effective aperture are linked by: where:…
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
It is commonly stated that acceptable error in flare angle on a SETI Horn of Plenty is lambda/4. Why is this amount chosen?
The commonly quoted lambda/4 criterion is not really a limit on the flare angle itself; it is a limit on the resulting path-length or surface-position error caused by a construction…
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
Can an existing SETI Horn of Plenty (Hydrogen Line Horn) be extended by adding an extension on the front? Practical answer and more detailed explanation of physics involved.
On Monday, May 25, 2026 at 1:09:30 AM UTC-7 Andrew Thornett wrote: Can a horn be made larger simply by adding an extension to end of same flare angle, or does…