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Author Topic: Stretchyman 40w GaN TX is sick  (Read 886 times)

Offline Antennae

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Re: Stretchyman 40w GaN TX is sick
« Reply #30 on: October 07, 2019, 0315 UTC »
I have a cheap-o PS I got from amazon. Its really stable and has its own variable fan. Says it can do up to 15A.

https://www.amazon.com/gp/product/B01CS5G8J6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I've got an inverted L that is about a 1/4 wave on upper 80m where the AM guys are.  There's a ground rod at the feedpoint and thats where I put the tuner. 

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RCVR: Radio Shack DX-398 portable, remote SDRs 
Antenna: usually a random wire with tuner

Offline Kage

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Re: Stretchyman 40w GaN TX is sick
« Reply #31 on: October 07, 2019, 0354 UTC »
And this is why I don't sell my old homemade transmitters to people. I've been asked before but always feared something like this would happen and I don't even build on a professional level like stretchy does. Oh those multiple pops... sure someone wasn't making microwaved popcorn in the other room? I could use some reading this thread.
I'm not saying aliens are in the radio, but aliens definitely are in the radio.
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Offline OgreVorbis

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Re: Stretchyman 40w GaN TX is sick
« Reply #32 on: October 07, 2019, 1041 UTC »
I have a cheap-o PS I got from amazon. Its really stable and has its own variable fan. Says it can do up to 15A.

I don't understand why so many people buy those unbranded Chinese power supplies. I've seen many of those malfunction.
I could understand if the price was significantly cheaper, but IT IS NOT.

You can get a good quality meanwell of that power level for $30
$19 vs $30 bucks isn't a big deal.

https://www.trcelectronics.com/View/Mean-Well/LRS-350-24.shtml

Once you get into the higher wattages, then it makes sense. For those higher powers, eltek flatpacks, and Chinese Velikas are good.
https://www.aliexpress.com/item/32835899833.html

Sorry to get off topic. I'm done.
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Offline redhat

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Re: Stretchyman 40w GaN TX is sick
« Reply #33 on: October 07, 2019, 2334 UTC »
I have a cheap-o PS I got from amazon. Its really stable and has its own variable fan. Says it can do up to 15A.

I don't understand why so many people buy those unbranded Chinese power supplies. I've seen many of those malfunction.
I could understand if the price was significantly cheaper, but IT IS NOT.

You can get a good quality meanwell of that power level for $30
$19 vs $30 bucks isn't a big deal.

https://www.trcelectronics.com/View/Mean-Well/LRS-350-24.shtml

Once you get into the higher wattages, then it makes sense. For those higher powers, eltek flatpacks, and Chinese Velikas are good.
https://www.aliexpress.com/item/32835899833.html

Sorry to get off topic. I'm done.

Agreed.  Mean Well is as bottom of the barrel as I'll go.

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WinRadio Excalibur/305 w/ a chi-town resonant loop, Kenwood KDC-U356 for mobile listening.
Please send QSL's and reception reports to xfmshortwave [at] gmail [d0t] com

Offline ChrisSmolinski

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Re: Stretchyman 40w GaN TX is sick
« Reply #34 on: October 08, 2019, 0934 UTC »
Hamfests are great sources for cheap but good power supplies. I have seen Vicor switchers for reasonable prices.  I have a Lambda 5V linear supply (9A rating I think) I use to power my netSDR and KiwiSDR. Sure the efficiency is not great and it runs a little warm, but it has a clean output. It runs around 48C but is rated to over 70C.   I keep meaning to put a little muffin fan on it to move some air around but all the fans in my collection are 12V  :)
Chris Smolinski
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eQSLs appreciated! csmolinski@blackcatsystems.com
NRD 545 / netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 670 ft horizontal loop / 500 ft northeast beverage / 58 ft T2FD / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop

Online Pigmeat

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Re: Stretchyman 40w GaN TX is sick
« Reply #35 on: October 08, 2019, 1935 UTC »
Yep, hamfest power supplies are cheap. If they blow you've got pre-milled box with plenty of spare parts. I've never paid over ten bucks for one.

Offline Josh

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Re: Stretchyman 40w GaN TX is sick
« Reply #36 on: October 10, 2019, 1819 UTC »
Some of those surplus open frame supplies are amazing, had a 10 amp 12v job that you couldn't measure a dip in v or a when you slapped a car headlight across the output.
Conveniently located near Vincennes Indiana.

Offline Stretchyman

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Re: Stretchyman 40w GaN TX is sick
« Reply #37 on: October 10, 2019, 1823 UTC »
MEANWELL are fine and dirt cheap. I use a 48V 10A one on my 100W design. Coming soon.....

Str.
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                            Buy one from me, NOW!

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