Morning report: Saturday 25.03.2017, still messing around with my quest for low cost high power rf-switch. I have cut and soldered a lot-lot-lot-lot-lot of coaxes since last post and….. Well, now it is looking really good, I have exchanged all the small diameter coaxes with larger ones, and there are now no heat loss I can feel with my fingers!
Operator is a bit too eager going on with the testing here, not checking all connection beforehand, resulting in the SSPA safety system trigging several times before it get going. (shame on me)
Here are a some pix & unabridged videos:
Update: I want to point out that the sun is well below the horizon here, and it is not the moon doing this. Have heard by others that we have had Nacreous clouds, sometimes called mother-of-pearl clouds today, guess it has something to do with this.
Probing around for a powerful 48vdc supply solution I landed on a fair priced Eltek Flatpack2 rack unit. I know, it is an overkill for HAM shack use with its 8kw of DC output power. But as Jeremy Clarkson says; quote “Power and speed solves many things” 🙂
Anyways, this really is a part of a telecom UPS system, and telecom 48vdc system has negative distribution with positive common return rail. This is the opposite of what we HAM usual needs, so it has to be rewired, or re-bared rather.
This is a 2U rack module with a smartpack2 controller and 4 x Flatpack2 2000w HE rectifier units. You can run a single rectifier without the controller but it will default to about 53,5 volts. In order to change the operating output voltage, you need the smartpack2 controller.
With the factory access password, you can with the controller permanently write new settings down to the rectifier, and it will default to any valid voltage value. Of course it is possible to hack and reverse engineer the eltek CAN-bus protocol with other tools. I know the e-bike community has done it.
Here are some pix:
My old MY 1986 Range Rover Classic – Has been parked under a tree for 10 years.
Battery is gone of course, but 30 sec. cranking with jumpers, and the good old V8 awakes from its long and deep sleep 🙂