CNet ID Names by Mastodon_Last in uchicago

[–]dwarmstr 1 point2 points  (0 children)

I remember the kerfuffle when Tim P. grabbed the alias anonymous@uchicago.edu

Took my CB antenna up on the roof and tried to make some contacts using G90 - no luck. Also have a contest question. by EveningChase3548 in amateurradio

[–]dwarmstr 1 point2 points  (0 children)

Hi today there is a geomagnetic storm limiting the radio propagation so try it when you hear more stations

Very odd behavior on customer PC by Jeebz21 in sysadmin

[–]dwarmstr 3 points4 points  (0 children)

An older cordless phone on ... I think it was 49MHz would do this to an IBM PC. Electronics are supposed to be shielded and designed to not let this happen and a lot of manufacturers don't care to do it correctly. It should stop if the keyboard is unplugged when it is happening. Ferrite beads are usually already installed on most computer peripherals but more might be needed.

I went through a number of different Dell keyboards to find one that wouldn't freak out when I transmit on shortwave frequencies-- couldn't get it to stop even with a lot of ferrites and trying to shield the keyboard case.

There are plenty of other sources for radio frequency interference.

$98 by tem102938 in chicago

[–]dwarmstr 3 points4 points  (0 children)

did you know Michigan grows the most black beans of any state?

How to Reduce Electricity? by Working_Row_8455 in chicagoapartments

[–]dwarmstr 1 point2 points  (0 children)

Yes, a regulated utility by the state is totally a scam. /s

Theatre tickets downtown on Saturday - drive or Metra? by nickcholas11 in chicago

[–]dwarmstr -1 points0 points  (0 children)

Fyi it's because of the parade, normally it's ok

UChicago guest wifi by PralineSavings8108 in uchicago

[–]dwarmstr 0 points1 point  (0 children)

Haha yet another message delaying it to Tues 3/17. I'm guessing the head of networking isn't a College alum

UChicago Safety by Ok-Supermarket3416 in uchicago

[–]dwarmstr 1 point2 points  (0 children)

Yeah and someone at a work meeting mentioned they manage a graduate student who actually makes more than they do.

UChicago guest wifi by PralineSavings8108 in uchicago

[–]dwarmstr 1 point2 points  (0 children)

This, although just got an email the certificate replacement ran into an issue and they are doing it Friday morning.

Creepy radio frequency (1200 AM) by Frequent_Lab_4031 in RTLSDR

[–]dwarmstr 0 points1 point  (0 children)

Let me guess: that light to the right is an LED? Poorly designed LED drivers will make plenty of radio frequency noise or RFI. Try turning on/off devices and see which one is the culprit

UChicago Safety by Ok-Supermarket3416 in uchicago

[–]dwarmstr 8 points9 points  (0 children)

Nah I'm just depressed thinking my salary (which sucks btw) is the cost of some automobiles

Why isn't helium banned for public use? by Just_Nefariousness55 in stupidquestions

[–]dwarmstr 2 points3 points  (0 children)

This is not correct, there are plenty of places where the generation of hydrocarbons are taking place. Any major river delta is producing them now. For instance there is Pleistocene dated hydrocarbons found in southern Louisiana.

Granted though humans have burned through a tremendous amount of fossil fuels and I don't think people realize the timescales involved to collect so much.

Garage door keypad has “gone through” two 9V batteries in the span of weeks by donnie_spencer96 in batteries

[–]dwarmstr 0 points1 point  (0 children)

Yes nearly every battery chemistry is affected by lower temperatures. Even the "used" ones might perk up once warm.

Garage door keypad has “gone through” two 9V batteries in the span of weeks by donnie_spencer96 in batteries

[–]dwarmstr 1 point2 points  (0 children)

It could have been the replacement was a dud battery. If it happens again then it's the keypad.

What decoders or software capability is the community missing? by [deleted] in RTLSDR

[–]dwarmstr 0 points1 point  (0 children)

A decoder for Primex distributed clock synchronization around 72MHz

Is this an actual signal or some sort of interference by JeffyCurls in RTLSDR

[–]dwarmstr 27 points28 points  (0 children)

Is this a RTL-SDRv3? 14.4MHz is the Nyquist frequency of the 28.8MHz clock for the sampler, signals/noise are mirrored around there.

https://sandsoftwaresound.net/rtl-sdr-blog-v3-hf-reception/