Anyone have a recommendation, url link is helpful, for the QDX transceiver DC power supply?

Thanks.

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I stay away from Wall Warts. ?Buy a rechargeable battery of just about any type and recharge it when you aren’t using it. ?Too many problems have come up with the QDX that may point to either a bad SWR or too much power. ?

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I'm considering the ALINCO DM-330MVT. Seems a decent power supply and gets good reviews.

I got one of these for a string of LEDs:



12VDC, 5A, available with a 5.1mm plug or little screw-on terminals.
USD$12., free conus shipping available with Prime or if your order
exceeds USD$25.

My first test application is a string of LEDs I am using for an
aquarium light. The supply is probably IP65 (water-resistant). I'd
feel safe with it next to my QDX out in the field. My LED string
draws 2.5A, and this supply gets up to about 37C (100F) in use. In
comparison, its predecessor is a 1A 12V Lambda linear open-frame
block PS that happily delivered the 2.5A but ran at 165F. With an
almost-silent 2 1/2" muffin fan on it, it cooled down to 110F. That
surprised me. The supply before that was a "1.5A" wall wart that
lasted only one night.

I haven't done any electrical testing on either the Lambda or this
little Peculiar (see the pictures in the listing) supply, but both
worked fine, once tweaked for this application.

This Peculiar supply, both my QDX cases (revs 3 and 4), and my
RasPi4's aftermarket black anodized case all match very, very nicely.
I'll try to get a photo this weekend.

I'll also try putting Little Peculiar on a 'scope and do load-testing
and input voltage testing to see what happens. I'll also try a cheapo
12VDC - 120VAC inverter that I know is at best a modified square wave.
If it's not noisy on line AC AND on the inverter, then it's a good
cheap possibility. Otherwise, the fish get it.

73
Jim N6OTQ

P.S I am not sure whether this Peculiar supply will have enough
headroom for the RasPi4, the QDX, a powered USB hub, and anything
else. But my inverter has more than one 110VAC outlet and it SAYS
"400 watts," Based on the last two supplies taken out of service on
the fishy LED project we all know what power supply labels are worth.
At 100% efficiency, 400 watts - 33 amps at 12VDC. Right.....


On Wed, Nov 23, 2022 at 6:13 PM kg4lac via groups.io
<kg4lac@...> wrote:

I'm considering the ALINCO DM-330MVT. Seems a decent power supply and gets good reviews.

I use 12v from a running computer PSU molex (yes, the horror!) But it is actually not that noisy, barely noticeable on the waterfall. It is a high quality PSU though. I also tried a standard 12V 5A?adapter and that is ok too. A pack of old 18650 batteries is of course totally noise free, but if they are not new and high quality, voltage may drop once you start transmitting. My advice is no need to go crazy with fancy noise free adapters for QDX, as its filtering capabilities are amazing.

On 24/11/2022 08:58, Vojislav [YU4HAK] wrote:

I use 12v from a running computer PSU molex (yes, the horror!)

I am not horrified:-)
I have used the PC supply for many years, I'm so used to it I forget and you reminded me.
I use a simple LF iron-cored choke and capacitors as a filter, have never been aware of any problems.
In fact for the older soundcard SDRs it helps to make ground loops easier to eliminate.
And also 5 volts USB, a simple filter keeps it fairly quiet. Many good modern SDRs are USB powered.

73 Alan G4ZFQ

I have two of them, very reliable! It is 12V/30A (but small)? and will power my KX3/KXP100 (and QDX!!) no problem!

Also my QDX's are 9V builds and I use this:?Mini MP1584EN DC to DC buck converter. No issues with it - Search Amazon?Mini MP1584EN comes as a 6-pack for under $20.

73

Terry

I've been using PSUs for a while and have been very pleased. They come with two sets of DC screw terminals and the output voltage is adjustable - handy if your output voltage is controlled by the input voltage (that is, no volume pot between them) :-) As my setup is all 12V (nominal), the 12V units work out for me quite nicely. They're also cheap enough that I can afford to do stuff like devote a single PSU to that QRP Labs 50W amplifier that I should soon be using for FT8 (might only be a 3-6db wattage increase, but that can make a difference...), thus allowing all of the PSU's resources to be devoted just to the amplifier (as opposed to the transceiver + amplifier).

Regards,

Charles Johnson
KF4AYT

PS I'm typing this on my iPad and I can't seem to test the link above, but a Google search of 'Mean Well LRS' should do the trick if the above link doesn't work.