Recent content by Waveguide

Unfortunately this LNB is mounted on my dish right now and I can't find any photos. (although there might be old photos somewhere that were made five years ago) No machining was made on the metal structure of original LNB. The plastic endcap was removed and the front of the new flange ends up in...

Unfortunately metal filled epoxy is also the recipie for a microwave absorbant. On the other hand, what you have beneath surface doesn't matter if the surface is a really good conductor. I use Eccoshield ES from Emerson & Cuming (Belgium) but there are other useful coatings like the conductive...

I have been running a converted Inverto Black Ultra for three years now without any problems. The interface consists of two parts made in a lathe and held together with a tight shrink-fit. (a tube for the circular waveguide and a plate for the flange, a thin line shows where they meet) Normally...

Satellites.co.uk - the place where ideas come to die! [martin-f] "are we saying the likes of channel master have got all there measurements wrong and fitted the dish arms in the wrong place etc etc ?" Where in the first posting is this mentioned? [martin-f] "what can we gain by all this...

I've got parts that could be combined to do the job but I have not actually done this type of measurement (yet). https://www.satellites.co.uk/forums/attachments/arduino_stepper-jpg.72933/ ...shows a component to get the angular resolution and precision needed. Manual operation gives 0,01...

If stepper motors were a part of your design the solutions are free if you want to "roll you own". This is a prototype for a controller for an indexing table (to be used on a milling machine). The tiny blue rectangle in the upper right-hand corner is a stepper motor driver that can switch 2 A...

Only a diode will not work if you want to run the motor in both directions. Diodes in series with zener diodes (two pairs anti-parallell) will limit the back emf. Light-bulbs are nice, low resistance cold and higher resistance at full voltage. Another question to VS. The voltage rating of the...

No filter capacitor after the diode bridge? Charging/discharging capacitors without current limiting (resistor) is one good way to fuse relay contacts if the peak currents are high. Easily tens/hundreds of amps for common voltages and sizes for electrolytic filter capacitors. Even if the relays...

Some types of relay switching of motors is safe if properly designed and the relays are of the type "break before make". One type is the relay equivalent of a H-bridge. Two two-pole relays with the contacts for one relay in the upper left and lower right parts of the H. The other relay on the...

A bouncing ground in the supply to logic circuits is just as bad as spikes in the +5 V line. Drawing a schematic of all the ground connections with all wires replaced by small resistors can sometimes help to understand what parts are common between the 24 and 5 V parts of the circuit. V-shaped...

... that's the one! Pages 7-32 to 7-35 and figure 4 to be exact. Now I will have a beer to celebrate that I created my own indoor Stonehenge. The boxes are upright now in a row like the monoliths.

No problem at all, I just have to haul four carloads of furniture (2 m3 each) from the hallway so I can get upstairs to the scanner. (IKEA sale) It's three pages in all, schematics and explanations, I'll try jpg-images here first. A pdf-document to some mail-adress if the jpegs don't work...

I just found my copy of National Semiconductor's "Voltage Regulator Handbook". (why do things you need disappear and return again when not needed) A chapter deals with automotive power supplies and mentions the real specification of normal voltages in a car, +80 V to - 50 V and not +12-14 V as...

Check the "Hardware Compatibility List" for the NAS and use the tried and tested types of UPS-units. The "early warning system" that gives time for a controlled shutdown of the drives uses a link between UPS and NAS so they must be compatible. I don't think the drives are protected without the...

Heard from inside of excavator: - Whats that flashing in the hole? - Probably the power line to the Ericsson Communications building. It just went black and people are running in our direction. - OK, if the next building to go black is Emerson Process I know exactly where we are on this...