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Messages - IQ_imbalance

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Software / Re: MySDRPlayback or similar?
« on: September 11, 2018, 0113 UTC »
Sorry to be a pest...but still getting the 'beta expired' error.

Software / MySDRPlayback or similar?
« on: September 10, 2018, 0126 UTC »
Hi all.  It looks like the beta of mySDRPlayback has expired....and the 1.0.0 version is the last one posted.  Does anyone know of an alternative that will let me demodulate and extract audio from an I/O file?  Thanks!

SIO 555 in Central MD.  Solid S4. 

0037Z: station ID Radio Humperdoo
(before that the Humperdoo bit from 'The Preacher')
0038Z: Slaughter and the Dogs?
0041: "BURP" & shoutouts
0043: more punk rock

How about some Black Flag?  (THANKS!)

Shortwave Broadcast / Voice of Nigeria 9690AM 1952Z 09 Sept 2018
« on: September 09, 2018, 1953 UTC »
S3-4, SIO 344; some minor fading.  Overall good copy.

I can see the carrier in Frederick, but it's way down there in the S1 weeds for me.

Shortwave Broadcast / MWV Radio Feda 11965 AM 1953Z 03SEPT2018
« on: September 03, 2018, 1954 UTC »
Peaking to S2, but mostly down in the noise weeds.  Can make out music and singing

Can see a carrier and music occasionally pops up, but signal bouncing around S1. Amazing as short-wave.info has this as a 100kW transmitter out of Madagascar....

S2 here...Charlie Daniels at 0107Z?

Equipment / impedence mismatch question
« on: September 02, 2018, 1559 UTC »
This is based off an observation i made trying to hook my H-800 directly into my afedri while on a road trip.  The receiver's HF input is 50 ohm per the specs, and the H-800 uses RG-174 (50 ohm) so I didn't anticipate any problems.  HOWEVER, the power supply box for the H-800 (the antenna probe receives power over coax from the box, and the connection to the receiver is on the box) uses RCA-type connectors for some reason while the afedri has those tiny SMA connectors.  No problem i thought, since i have a spectrum of various adapters.  So i hook everything up, with an RCA to F-type coupled to a F-type to SMA which is plugged into the afedri (I did NOT have a RCA to sma hence the workaround).  Long story short..the receiver was deaf as a bat.  Thinking there might be a problem w/ the H-800, i decided to rig up an improvised LOG using the RG-174 as it was the only coax i had.  Still nothing...which was very odd considering i've had very good luck with LOG from that remote location before.  The coax was visibly intact and had good conductivity between the ends.  I finally considered the option that there might be an issue w/ the adapters and did an improvised connection (e.g. cut the RCA off the coax and directly made conductivity between the coax and the SMA connector on the radio) and BOOM!  everything working great. 

So...the adapter seems electrically fine in terms of conductivity.  My working theory was that there was a problem with the 50 ohm-75 ohm-50 ohm mismatch between the coax, the adapters, and the radio.  Does that make any sense at all?  If so...why do i get OK results going from an antenna through 75 ohm RG-6 and into the radio with an F-type to SMA connector?

Equipment / Re: Grounding systems
« on: July 28, 2018, 1930 UTC »
UPDATE:  OK I think i have the final plan.  I'm going to add two more ground rods between the shack and the mains service entrance (so there will be one at service entrance, one at the shack entrance, and two in between (so about 20' between rods).  I'll bond them together with 6 AWG Al wire, and the ground plate in the shack entrance box will be bonded to the ground rod there with 2" strap (or braid, whichever i can find).  The coax from my LOG will go through a 75ohm surge protector/grounding block bolted to the ground plate in the shack entrance box.  The coax from the LOG is buried for at least 40 feet before it makes a run across the back of the house, so i don't see much point in grounding it at its balun box (buried in the front yard).

Now, the AARL operating manual says to bond the RF bus to the AC safety ground and to bond everything together to the ac service entrance rod.  Does this mean i need to also run a ground strap from the AC outlet I'll be using to my station ground?  I think i recall seeing a powerstrip somewhere that had a connection for an additional ground.....

Equipment / Re: Favorite coax for HF receive antennas ?
« on: July 19, 2018, 2305 UTC »
Thanks all.  Will hit the internets and shop around this evening. Right now my radio is by the front door w/coax sneaking in through the screen door. Not a permanent installation.....

Herbie Hancock Axel-F at 2259Z.

Wonder if there’s a loose connection or something?  During previous music signal would go from S5 to QRN and right back again a second or so later

Have it here too...was blasting clear and loud at S5 but has faded down to S2-3 as of 2252Z.  Back at S5 at 2253.5Z.  Playing w antenna?

Equipment / Favorite coax for HF receive antennas ?
« on: July 19, 2018, 2129 UTC »
I'm going to have to run something like 100'-120' ft of coax to get my LOG antenna connected to my radio room.  Anyone have favorite versions of coax beyond RG-8/U, LMR-400/DMR-400, RG-6/U, and/or favorite vendors?    It's for HF <15Mhz RECEIVE ONLY, direct (shallow) burial.


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Item image   Computational Electromagnetics: Frequency-Domain Method of Moments - IEEE