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 permissible 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 ... 7 8 9 10 11 12 13 14 [15] 16 17 18 19 20 21 22 23 24
211
Equipment / Re: Electronic Dog Fence Wire as Antenna
« on: April 22, 2018, 0132 UTC »
Just discovered an invisible pet fence installed by the previous owners of my house. I'm going to check for continuity, but if its still in one piece I'm going to see what happens when used as a "Loop UNDER ground" antenna....

212
Just for peoples' amusement. On the left, the parallel tuned wave trap for 820kHz.  On the right, the series tuned wave trap w/ an adjustable coil.  Neither did much, if anything  ::)

213
Well my first attempts at building notch filters left much to be desired. Tried a series tuned wave trap w/ a tunable coil and a parallel tuned wave trap specifically for 820 kHz.  Didn't see any attenuation, either alone or in combination w/ my BCB high-pass filter.  Could be the cheap Amazon components (fixed value inductors & capacitors), could be my questionable wiring skills, could be the antenna is boosting the broadband signal coming in to a point where i can't notch it out.  Oh well... I don't think i'll quit my day job just yet. 

214
Clandestine Stations / Re: Denge Welat 7320 AM 2131 UTC 21 Feb 2018
« on: February 24, 2018, 1711 UTC »
I'm basing the ID off the SW schedule Chris provides in DX Toolbox.  Looking at the transmitter location in DX Toolbox and for Radyoya Denge Kurdistane (from Short-wave.info) it looks like a match for location and frequency.....

215
Shortwave Broadcast / R.VERITAS ASIA 15355kHz 2209 UTC 21 Feb 2018
« on: February 21, 2018, 2209 UTC »
Way down in the weeds (S2-ish).  Able to catch a word here and there. 

216
Clandestine Stations / Denge Welat 7320 AM 2131 UTC 21 Feb 2018
« on: February 21, 2018, 2135 UTC »
Signal down in the S2 range; can barely make out words.  No music....

217
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.

218
Coming in like gangbusters solid S7 peaking to S8 with very little static.

219
Fading in and out here.  Thought i was imaging things for awhile.

220
No, trying to notch out 700kHz and 800kHz in order to deal with the high power BCB stations near my house that are overloading my receiver.  If possible i'd like to target those two frequencies as they bleed through the high pass filter I already have. 

Perhaps I could either 1) make two filters and separate w/coax (which would give the resistance you pointed out), or 2) put a metal shield between the parallel trap and the series trap and connect them with coax (or maybe a 50 ohm resistor if i can brainstorm a way to do that inside the can). 

221
I had pretty good luck with NDBs using my H-800...but that was with my PCR-1000, not the Afedri (which is sensitive to BCB overload).  Might be worth looking at LF Engineering's dedicated LF antennas, depending on your receiver.

222
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....

Thanks!
R

223
0314Z-Metallica The thing that should not be

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

224
oooooh nice. 

225
Equipment / Re: Grounding systems
« on: February 08, 2018, 0112 UTC »
Thanks for the Nautel reference.  Looks like i have some options....run the antenna feed all the way around and ground at the electrical box on the other side of the house, ground it at the shack entrance and bond that ground to the electrical main ground with strap, or put a bunch of ground rods in between the shack entrance and the electrical box and use a ground wire. 

Pages: 1 ... 7 8 9 10 11 12 13 14 [15] 16 17 18 19 20 21 22 23 24
HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns