Can a tuned Yagi be used as feed on a dish?
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A tuned Yagi can be used as the feed for a parabolic dish, including at 1420 MHz, but it is usually not the best choice. The important point is that…
Interferometry fringes on ezCon: If the dishes are moved closer together what will happen to fringes
INTERFEROMETRY - WHAT HAPPENS IF THE DISHES ARE MOVED CLOSER TOGETHER? DISH 1 DISH 2 \ / \ / \ / \ / |<------ BASELINE ---->| MOVE DISHES CLOSER TOGETHER…
New interferometry arrangement at LRO using 2 x KrakenRF Discovery dishes with KrakenRF Discovery hydrogen line feeds on both of them and Wilkinson combiner/divider to combine signals from both dishes
The new setup is the pair of dishes on wooden mount on right hand side of photograph below:
Effect of changing the pull-up resistor connecting the lock indicator pin on the rubidium 5650A time source DB-9 port to +5V supply from 4k7 to 20k on 13 September 2026
Voltages measured have changed to these new values: 2.865 V unlocked 0.264 V locked (Previously were 3.8 V and 1.001 V with 4k7 resistor)
If I make cantenna with overlapping pieces of metal sheeting, then how important is it to have electrical connection between pieces of metal?
If you mean a metal cantenna/waveguide assembled from several separate sheets or pieces, then yes—the electrical connection between the pieces is quite important, especially as frequency increases. The reason is…
Is there non-conductive aluminium tape?
Yes—but the terminology is a little confusing. Aluminium foil itself is always electrically conductive. What you can buy is aluminium tape with a non-conductive adhesive. In that case: If you…
Results of repeat testing of rubidium 5650A time source
That completes the picture very nicely. The 30-minute run looks highly repeatable and stable. The important observations are: So your measured sequence is approximately: The particularly convincing result Your Pin-3…
How to wire up and power up 5650A rubidium time source
From my experiments, the following have been confirmed for my unit, unless stated otherwise. Confirmed pinout arrangement for my particular 5650A device: For the FE-5650A pinout we have been using…
Interpretation of results from first successful rubidium lock achieved with 5650A
https://www.astronomy.me.uk/first-successful-rubidium-lock-achieved-with-5650a-rubidium-time-source-12-september-2026 The stable waveform from power-up seen on the Rigol DS1102 oscilloscope fits quite well with how a rubidium standard works. The 10 MHz oscillator itself can start immediately and…
First successful rubidium lock achieved with 5650A rubidium time source 12 September 2026
Voltage between lock status pin and signal ground pin 7 on 5650A with 4k7 pull-up resistor to +5V source immediately after stsrt-up: Voltage remains at level above until the power…