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Author Topic: Switching power supplies  (Read 7346 times)
NZ0T
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Posts: 74




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« Reply #15 on: July 11, 2013, 04:31:10 AM »

This problem is overstated because modern devices from TV to radios to phone chargers all using switches supplies. With a good design there is no problem.

It's only overstated if you don't have a noisy switching power supply like the SEC-1223.

Not to push the matter, but just because you have one that is noisy doesn't make all of the Samlex supplies bad.  The reviews section here has the score of 4.4 out of 5 for an average.  That's pretty good--for what you claim is a bad, noisy power supply.

I bought a 35 amp Jetstream switcher with battery backup that had terrible S9+ birdies up and down all the HF bands.  It was even worse when the backup charging line was hooked up to my batteries.  I ended up sending it back   Yet the reviews for this particular PS are generally positive. Guess I just got a bad one.
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AA4PB
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Posts: 12685




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« Reply #16 on: July 11, 2013, 08:23:20 AM »

Switching power supply noise into the receiver is dependent on the distance between the antenna and the power supply, whether or not there are any common mode currents on the antenna feed line, and the type of antenna, in addition to the actual noise being generated by the supply. For that reason one person may report no noise from a particular make/model of power supply while another reports bad noise.
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KE7TMA
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Posts: 459




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« Reply #17 on: July 11, 2013, 04:53:32 PM »

This problem is overstated because modern devices from TV to radios to phone chargers all using switches supplies. With a good design there is no problem.

It's only overstated if you don't have a noisy switching power supply like the SEC-1223.

Not to push the matter, but just because you have one that is noisy doesn't make all of the Samlex supplies bad.  The reviews section here has the score of 4.4 out of 5 for an average.  That's pretty good--for what you claim is a bad, noisy power supply.

There have been quite a few mods made available for the Samlex SEC-1223 on the internet over the past few years.  I haven't heard of anybody exactly saying it's a bad PSU, but some people have identified and cured RFI caused by design choices (flaws or cost cutting) in the unit.

I have had mine for years now and it has always been reliable, however like others I have noted a drop in voltage when it is under load.
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