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Topics - IQ_imbalance

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Shortwave Broadcast / BSKSA 9555kHz AM 2116 UTC 21 Feb 2018
« on: February 21, 2018, 2118 UTC »
333.  Solid if a little weak and some minor fades.  Weaker but much more intelligible than the broadcast on 9870kHz.

Coming in like gangbusters solid S7 peaking to S8 with very little static.

Hi folks.  i'm putting together a notch filter to deal with the two BCB hotties within about 10km of me.  I think i've done the math right and can figure out the necessary components.  Since there are two frequencies I need to notch, i'm going to set up a series tuned trap for one and a parallel tuned trap for the other.  I was thinking i would put these both in my extremely fancy project box (aka mint tin); are there any interactions or pitfalls i need to worry about?  The fine tuning will be done with a shielded tunable inductor (one on each trap) instead of a variable capacitor mainly because i couldn't find a small variable capacitor in the range i needed....


0314Z-Metallica The thing that should not be

S5-6 with the occasional fade.  Sounds great though!

Equipment / Grounding systems
« on: January 23, 2018, 1312 UTC »
So this spring might be time for ďoperation permanently mount antennasĒ.  One big part of that will be installing my station ground.  I need to bond the feedpoint ground to the houseís entrance ground which is pretty much on the other side of the house, so Iíll be running a strip of copper (probably copper) flashing around to make that connection., and adding an extra ground rod about halfway where it goes around the corner of the house.

One question Iíve been pondering is how wide of a strip is sufficient given that itís a fairly long run (60-feet or so)?


Equipment / Loop on ground experiment
« on: January 13, 2018, 1612 UTC »
Finally got off my lazy butt and pulled all the pieces together to try a loop-on-ground antenna.  I've got about 60 feet of insulated solid copper wire haphazardly looped around the backyard and feeding into one of the NooElec 1:9 baluns.  Some RG-59 takes that upstairs to the radio and through the BC filter i've posted about before. 

This is probably not the best time of day to mess around with it...but initial impressions are favorable. On 20 meters there's at least one S unit less background, and the birdies don't appear as bad compared to the H-800. 

Looking forward to this evening and seeing what pops up on 41 meters...if it shows good performance there it might be a keeper, and i'll have to figure out some way to do a more permanent install.  That is one where the local wildlife won't run off with my balun and antenna wire.....

North American Shortwave Pirate / UNID 6940 USB 0222 11 JAN 2018
« on: January 11, 2018, 0224 UTC »
Solid S4 signal into Central MD.   Peaking in the S7 range.
~0221Z:  Ministry Psalm 69
~0223Z:  NOFX We Called It America
  0227:  NIN Heresy
  0228: Nirvana Smells like teen spirit
0237:  station ID, signal fading & couldn't catch.  go figure
~0255 or so...off the air

Thanks for a great show! 

Peskies / UNID 6933USB 0148Z 08 JAN 2018
« on: January 08, 2018, 0150 UTC »
sounds like old-time music....barely above S5 noise floor

Propagation / is it me?
« on: January 07, 2018, 2350 UTC »
Or is propagation around 41m or so reallly bad this evening? 

Equipment / cheap amazon BCB AM filter....
« on: December 14, 2017, 0203 UTC »
Just received my cheapo Chinese BCB AM filter from Amazon.  The good news...it doesn't make the radio (Afedri SDR-net) deaf.  The bad news...it doesn't completely deal with my intermod problem.  I'm just going by eyeball right now, i'll try and do some direct comparisons +/- filter later this week or weekend and post some data.  I do wonder if it would be possible to stick it between the antenna probe and the amplifier on my H800, however....logically it seems to me at least it would make sense to remove as much unwanted signal before the amp......

North American Shortwave Pirate / UNID 6930 USB 1906 UTC 02 Dec 2017
« on: December 02, 2017, 1907 UTC »
Someone broadcasting tones, sounds like Xmas music?

Other / "preacher" 7185 kHz LSB 1800 02 DEC 2017
« on: December 02, 2017, 1801 UTC »
Assuming this is considered a pirate since he's blabbing on 40m....mods, feel free to move if otherwise.
Good signal and copy (S6)

Other / What is up on 6944 kHz 2320 29 Nov 2017???
« on: November 29, 2017, 2324 UTC »
See screenshot...not sure what mode this is, but it's the first time i've seen it pop up in the 43m pirate band.

SDR - Software Defined Radio / intermod weirdness
« on: November 19, 2017, 2205 UTC »
So I'm sitting here monitoring the 43m band for this evening's entertainment....everything is nice and quiet until BLAM.  I see a carrier pop up on 6935kHz which rapidly develops into severe intermod (local AM station, sounds like).  It lasted a couple of minutes, and then died down to a barely visible carrier signal.  I didn't touch a thing....

Utility / OTHR 60m 0158Z 18 NOV 2017
« on: November 18, 2017, 0202 UTC »
Seeing OTHR on 60m...two distinct signals, a strong signal centered at ~ 4750kHz, and a weaker signal centered at ~4820kHz.

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