We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - IQ_imbalance

Pages: [1] 2 3 ... 16
Equipment / Re: Up the discone!!
« on: June 01, 2020, 1612 UTC »
Some additional data....apparently the DJ-130 can survive free fall from about 40' onto a deck.  20lb test line does NOT hold up well.

Good news though, the 550 cord arrived and i used it to hoist the antenna back up.  As long as the squirrels don't eat it, and the branch holds, I think i'm in a good place.

Equipment / Up the discone!!
« on: May 15, 2020, 0010 UTC »
Today I started my little project to get some elevation on my DJ-130 discone.  Itís been mounted on a 2nd floor deck, but I want to try and raise it above the roofline if possible.

Its new home will be a tree so I broke out the fishing pole, lead sinker, and slingshot. I was pleasantly surprised to manage to get the line on a decent branch without the lead sinker breaking any windows or heads.  So far so good....

Next was to swap the 20lb test for something more substantial.  Unfortunately the 550 cord I thought I had was nowhere to be found beyond bits and pieces, but nowhere near the length necessary.  Amazon to the rescue, but that means itís in a holding pattern for now.

SDR - Software Defined Radio / Re: SDR recommendation......
« on: May 13, 2020, 2350 UTC »
I'll second the afedri recommendation...very happy w/ mine (it's the HF/VHF version).

With 5 acres you could set up a pair of loops and phase them....that might be fun. 

Equipment / Re: Grounding A Radio
« on: May 13, 2020, 2317 UTC »
Make a big ol' "Enemy of the State" faraday cage and ground it to that.   ;D

J/k....you probably just need a counterpoise, so run some wire around the perimiter of the room or (as ThaDood pointed out) stuff it under the carpet!

Equipment / fun toys (digital multimeters/oscilloscopes)
« on: May 12, 2020, 1918 UTC »
Just putting this here....i'm a fan of things that leverage the damn expensive hardware i carry in my pocket...

Shortwave Pirate / UNID 6955 USB 0205 UTC 08 Dec 2019
« on: December 08, 2019, 0212 UTC »
S3-S5.  SIO 444.
0205: Stray Cats Rock this Town
(another stray cats song, then some metal...)
0210: rap
0211: Popeye twist.  still SIO 444.
0213: guitar instrumental..Parisiene Walkways?
0216: Radio Ga Ga
0218: OTA

HF Mystery Signals / 7335 and 7365kHz CW? 20191116 0216 UTC to ???
« on: November 16, 2019, 1614 UTC »
Maybe CW?  Broadcast on 7335 and 7365 kHz 20191116 0216 UTC until ?????.  Captured from central MD, but also noted on Kiwis across eastern US (didn't check western US).  TDoA suggested SE US, maybe Florida....

Someone on HF chat commented that these are Radio Marti freqs.....

Haven't dug into it but these folks were saying they share their benchmarks, etc.  Other than brute force FFT, wonder what other features would be good for a dedicated SDR rig?  Network I/O comes to mind, but wonder what else.....

There's a company that benchmarks and assembles desktops based on intended software use....


0323 UTC:  news story about longline fishing negotiations
0329 UTC:  music
S2-3; SIO 333.  Pretty amazed that it's coming in this well! 

Equipment / Re: Question about radiation.
« on: June 30, 2019, 2326 UTC »
Ditto what Chris said.  Alpha emitters are harmless until you ingest or inhale them.  It's probably radium, but could be promethium, strontium, or (less likely) tritium....(https://www.orau.org/ptp/collection/radioluminescent/radioluminescentinfo.htm).  Promethium, strontium, and tritium are beta emitters which aren't quite as bad when ingested as alpha emitters, but you still want to limit your exposure as much as possible.

I think it would be a very interesting question which isotope the USSR preferred for their instrumentation. 

There are spectrum analyzers that can measure the radioactivity coming off a sample and return a list of the radionuclides present.  If you know any first responder types you might ask them if they have access to one....

Perhaps you could seal the paint back onto the radio with some nail polish or something similar?

Two signal enter.  One signal leave.

HF Mystery Signals / UNID pips ~ 14220kHz 1337 UTC 7 June 2019
« on: June 08, 2019, 1806 UTC »
These came up at multiple frequencies (although I don't recall if they were concurrent) on the morning of 7 June.  Interesting thing is the train on a frequency would cycle up in magnitude and back down again....maybe a directional antenna sweeping around? 

Shortwave Pirate / UNID 6925 AM 2008 UTC 13 April 2019
« on: April 13, 2019, 2009 UTC »
2008 UTC AC/DC Hells Bells...right at QRN. SIO 222, brief bump up to SIO 333
2011 UTC AC/DC Shoot to Thrill
2016 UTC AC/DC ???
2019 UTC off?

Pages: [1] 2 3 ... 16