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Test Equipment Anonymous (TEA) group therapy thread

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bd139:

--- Quote from: Specmaster on June 25, 2018, 04:53:50 pm ---
--- Quote from: mnementh on June 25, 2018, 04:37:14 pm ---
--- Quote from: bd139 on June 25, 2018, 10:41:13 am ---If you only need an amp, these are on offer on CPC: http://cpc.farnell.com/aim-tti-instruments/el301r/power-supply-30v-1a/dp/IN0576761

£100 aint bad.

Economy option: http://cpc.farnell.com/tenma/72-10480/power-supply-1ch-30v-3a-adjustable/dp/IN0682261

Same unit as a Korad 3003D.

--- End quote ---

Very interesting... they are also available from Amazon.uk for a similar price, and the same supplier has a dual 5A version for £140.99.

Fekking bass-tards won't ship to the US, though... and even the cheapest single-out knob-tune Tenma PSUs are over a hundred on slAmazon.us  :wtf: ???


Here's the dual-out unit at Farnell.uk for £120.79


mnem
Percussive maintenance is a required skill in any endeavour of any real significance.

--- End quote ---
That price from Farnell is actually dearer as it has to have the VAT added on at the checkout adding on a further £3.96.

I have noticed that with my hum problem, if I plug that PSU in another socket on the other side of the room but still on the same ring main, the hum is almost inaudible. I'm beginning to think it has something to with some sockets on my bench being fed via a surge protector and others not protected. A bit more detective work is called for I think.

--- End quote ---

Ground loop.

Specmaster:
Yep, thats what it is, just exchanged the feed socket with something else and unless I'm using the full 30V the hum is not audible, just saved me some cash I think for other TEA items when something catches my eye. :-+

I don't think I'd have liked downsizing to 1A from 5A, I know most of my stuff is only mA's but its still nice to have that spare capacity if needed.

bd139:
My most power hungry circuit, a homebrew WSPR TX uses 200mA flat out. That gets to the Canary Islands and East coast US. It's not how big it is but what you do with it  :-DD

Amazing considering my fucking Yaesu lump can't manage that on the same antenna with SSB at 100W out and 18 amps in  :scared:

Focusing on much less power usage here :)

Specmaster:
Maybe thats a route sign that you could be ignoring right there. Just maybe you ought to chuck some resources at it and develop that further and come up with a marketable product to take on the likes of Yaesu and give the world what it needs, enhanced performance and a massive reduction in energy consumption. Just think of the implications if similar energy savings could be made on other products, may we wouldn't need any more power stations. That would have a massive impact on the CO2 levels.

bd139:
Mine isn’t the most efficient out there. I’ve got one of these which will do 3 hours on a PP3 or significanty longer on Ikea NiMH cells:

https://qrp-labs.com/qcx.html

Then there’s this which is pretty amazing for the size:

http://www.elecraft.com/KX3/kx3.htm

But I didn’t design them :)

Main thing is slow rate digital modes need less power and blast through the shitty propagation at the moment so Morse, FT8 or QRSS etc.

Copying straight out of Wikipedia: The current record for a QRP connection is 1 µW for 2640 kilometers (1650 miles) on 10-meter band (28-29.7 MHz).

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