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Author Topic: What Power Supply?  (Read 2528 times)
G0MGK
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Posts: 7




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« on: August 21, 2009, 12:36:06 AM »

Just about to upgrade my station from FT-110ZD to a Kenwood TS-480.

I only have a 6A PSU (used for an Icom 3200E) so need a 22-25A one.

Not sure about switch-mode ones, are they noisy?

My two selections (open to suggestions though) are:-

MyDel MP-925 (big transformers, 'normal' PSU)
or
MyDel MP-8230(8320?) switch-mode.

Thoughts? Comments?

Space is not too big an issue as I am replacing the boat anchor FT-101!
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AA4PB
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Posts: 12779




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« Reply #1 on: August 21, 2009, 05:32:41 AM »

I have no personal experience with the Mydel supplies but if size is not an issue I'd opt for the linear supply. For one, it has metering built in. Linear supplies are much easier repair and there is very little likelyhood of any RFI issues with it.

Switch mode supplies can generate RFI into the receiver, especially if the antenna is close by - but most are pretty quiet these days.
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G0MGK
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Posts: 7




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« Reply #2 on: August 23, 2009, 01:14:34 AM »

Linear is my 'gut feel', but I may be tempted by the smaller size of the switch-mode. I'm looking forward to reclaiming some desk space!

I'm buying on Friday, I'll report back!
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K8AC
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Posts: 1465




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« Reply #3 on: August 23, 2009, 07:17:27 AM »

I have a TS-480 that I power with an Alinco DM-330MV switching supply when traveling.  I've also tested that supply in my home station on all bands with a variety of antennas.  Interference from that supply has been a problem only on 160 and 80 meters, where there are occasional watery sounding discrete signals at multiple places on the band.  The Alinco has a small knob on the front that apparently tweaks an oscillator frequency in the supply, as you can use it to move the interfering signal away from the signal you want to listen to.  These interfering signals are quite weak, but can be troublesome when dxing on 160 and 80 CW.  This supply does not increase the noise floor with broadband noise.  From the test reports I've read on switching supplies, they all generate noise signals to some degree and whether or not they will cause you a problem depends on the bands you operate on, your antennas, etc.  I stick with the linear supply in the home station, but use the switching supply on vacations.
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G0MGK
Member

Posts: 7




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« Reply #4 on: August 28, 2009, 08:57:47 AM »

I finally went with the MP-8230 switch-mode after hearing the fan on a linear supply!

No noticeable RF noise so far, but haven't been playing long.

BTW  -I think the TS-480-SAT is excellent!

Full review when I have played properly!
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