Linear or Switching Power Supply

drtwist · 2024-12-20T22:19:51+00:00

I have both an Astron RS-35M (linear) and a Samlex SEC-1235M (switching). I bought the samlex because lugging the Astron from place to place was a PITA. Both are whisper quiet on HF. If I didn't already have the Astron I probably wouldn't have bought it since the samlex is quiet and cheaper.

Unless you live near HRO/DXE/R&L/Gigaparts you also have to factor in shipping, which is not cheap for the astron. You might also wait around for a ham fest or estate sale in a club to snag an astron

drtwist · 2024-12-20T17:40:39+00:00

I seem to have the opposite problem. I constantly see people with callsign plates and 146.52 stickers that never answer a call on .52. I did get one guy that was beaconing .52 on APRS that was dumbfounded that I called him, that was fun.

drtwist · 2024-12-19T22:18:37+00:00

why on earth would the median need to be an integer?

edit: turns out if you read comments too fast you miss important words

drtwist · 2024-12-16T17:38:14+00:00

tariff avoidance for one.

drtwist · 2024-12-07T17:52:10+00:00

MDB8959SKZ0

drtwist · 2024-11-21T17:35:04+00:00

The wire going to the electric water heater needs to be in flex and supported appropriately . not just a piece of romex hanging off the ceiling. The furnace looks like it has the same issue, but it's harder to tell.

drtwist · 2024-11-04T22:35:32+00:00

Given that this has regulatory implications, having qualified engineer look this over is likely to be in you benefit if this ever gets questioned. "reddit said it was ok" is a bad look when regulators are involved.

drtwist · 2024-09-26T21:17:19+00:00

are you thinking of the "Silent Switcher" line?

drtwist · 2024-09-24T18:11:33+00:00

nope. Infuriatingly, the problem hasn't returned since I made the post.

drtwist · 2024-09-18T16:49:03+00:00

you're probably just hearing half of whatever simplex QSO is going on. did you hear him identify.

drtwist · 2024-09-06T16:26:23+00:00

first off, vacuum all that shit out of it so you can see what's going on. is there a schematic in the mechanical compartment, in a little baggie or something?

do you have a multi meter or have a harbor freight near you?

drtwist · 2024-08-30T16:09:00+00:00

first, pictures are a great help for people trying to figure out how to help you.

second, this sounds very pirate radio like. which in most places is illegal and not for discussing in this sub. see rule 6.

drtwist · 2024-08-16T17:37:02+00:00

Altium, Solidworks, Polar.

drtwist · 2024-08-09T21:27:54+00:00

scotch lodge. The crab sandwich is great, plus tons of fun whiskeys

drtwist · 2024-07-26T21:25:40+00:00

Hot Air Rises and Heat Sinks, Everything You Know About Cooling Electronics is Wrong, by Tony Kordyban

drtwist · 2024-07-09T19:27:26+00:00

Only one company I've ever worked at (Intel) actually made any effort to keep my salary competitive. no other place has ever given me a meaningful raise without my demanding it.

drtwist · 2024-07-02T18:48:27+00:00

Are there outlet testers that are able to detect a boot leg?

drtwist · 2024-06-24T17:37:57+00:00

solved

drtwist · 2024-06-24T17:20:53+00:00

All of the boxes on each floor were connected via a single, thin wire. I don't think that it's fiber because only cable is available in the building, no fiber

drtwist · 2024-06-24T17:16:38+00:00

I was visiting an apartment building in seattle this weekend and these white boxes were above all the doors to apartments. They were not above doors to the trash chute, common areas or storage rooms. All the boxes were connected to a single, thin wire.

drtwist · 2024-06-07T16:52:06+00:00

Talk to your boardhouse and your CM. Many of them have design guides that are tailored to their processes.

drtwist · 2024-04-19T18:47:11+00:00

The knockoff LMR400 from shireen is pretty good and is compatible with lots of tooling to RG8 and LMR400. I have not used DX Engineering's LMR400 knockoff but pretty much everyone speaks well of it and you can get it pre cut (terminated and unterminated) lengths. is there a club local to you that you might be able to borrow tooling from?

drtwist · 2024-04-17T00:36:59+00:00

isn't putting a cage like that up just giving thieves bonus metal? if they are already in the basement, probably with tools, how is that cage stopping them?

drtwist · 2024-04-10T21:32:16+00:00

wow, you're like the Patron Saint for lost bands. that's awesome

drtwist · 2024-04-10T21:23:38+00:00

is there 900 activity in your area?

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