Conversation
jmorris

James Morris

Edited 1 year ago
Finished making a thing. This is a power supply for the 30W 10 GHz amplifier I’m working on. It should also be able to power the transverter, IF radio, & relays. I’m resisting the temptation to add an MCU and display. For now.

(Note: the 50 Hz label should say 60 Hz)

#hamradio #electronics #amateurradio #microwave #qro #sspa
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jmorris

James Morris

Reply to @jmorris
Using green wire for ground because the USA uses black for mains hot (active). I try and do this here when AC & DC are in the same enclosure. In Australia, brown is active and blue is neutral.
Also, fwiw, mains voltage here is supplied to homes as 240v, split into 120+120, neutral is centre tapped. It is not 110, 115, or whatever else you see: it’s 120v. Heavy duty appliances typically have 240v supplies, and some people run 240v to an outlet in the garage.
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jmorris

James Morris

Reply to @jmorris
Also, re US vs .au, the way people talk about mains phases in the home can be confusing. Each 120v supply is called a phase, whereas if you have two 240v phases in .au, it's from a 3-phase feed. The 3-phase power I've seen in a person's garage here was 480v, which is getting well into catastrophic arc flash territory (search it up on youtube for an exciting time). People here very often do their own mains wiring mods, which is extremely unusual in Australia, I suspect in part because the default 240v is often lethal. Expect to die if you touch it.
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penguin42@mastodon.org.uk

penguin42

Reply to @jmorris

@jmorris In the UK we're also 240v, it's very rare to see 3 phase inside a normal house/garage. US 3-phase is much weirder, they have wildly different 3 phase voltages in different places.

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praxiscode@mastodon.online

Man aging with style

Reply to @jmorris

@jmorris
I see you swapped out the connector on the panelpole. I had to do that, too, for my setup. Getting the pin out (and then back in again!) was a pain. Bench vise to the rescue.

West Mountain Radio uses violet+black for 48v on their rigrunner.
https://www.westmountainradio.com/product_info.php?products_id=rr_4008hv_p48
I've seen orange+black or yellow+black for 24v/28v.

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mw1cgg@mastodon.radio

JamesB

Reply to @jmorris

@jmorris 240V is not quite as dramatic as that. I've had a few shocks and it's not pleasant but it's not necessarily certain death in a lot of circumstances if you can break the connection between it and you.

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jmorris

James Morris

Reply to @praxiscode@mastodon.online
@praxiscode yeah, it was not fun getting that pin out.
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praxiscode@mastodon.online

Man aging with style

Reply to @jmorris

@jmorris
I used a drill press with a drill bit mounted backward to push it out enough to grab onto it, and the bench vise to press it back in.

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jmorris

James Morris

Reply to
@stefanfendt there are RCDs (GFCIs) in the US on many outlets, especially near water or outside.
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jmorris

James Morris

Reply to
@stefanfendt this is what I'm referring to, 480v with all 3 phases shorted together, https://www.youtube.com/watch?v=kXO9GJXF1kg
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jmorris

James Morris

Reply to @penguin42@mastodon.org.uk
@penguin42 that’s why we just mentioned the one 3 phase I’d seen. I don’t understand it in general.
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jmorris

James Morris

Reply to
@stefanfendt good to know. I have seen main circuit RCDs for sale in the US, but they are in the hundreds of dollars and I don't know if or where they are required. No way a typical DIYer here is getting into that level of expense and expertise -- I assume any normal GFCI will trip on significant inductive or capacitative loads. People here expect such components to be very inexpensive.
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