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Topics - IQ_imbalance

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Just picked up a dual channel Afedri (yay me!) BUT i'm running into severe performance problems on my ~2015 imac (4GHz quad core i7 w/ 8Gb).  Basically i'm getting a lot of buffer overruns (underruns?) and unintelligible audio decoding  with the status display in SDRDX showing -1000 ppm.   If I turn off dual channel mode I'm still seeing -1000ppm but the audio decodes fine.   

I've tried reducing the bandwidth to 200kHz, dropping the FFT for the waterfall to 4K, and reducing the max display setting to something crazy low (5 updates/s).   In comparison I usually run my single channel afedri at 1000kHz bandwidth, with the FFT set at 16k and 50 updates/s. 

I think this is a processing issue on the computer and not a network issue as it persists whether or not i'm plugged directly into the radio w/ ethernet or not (vs. having it plugged into an unmanaged switch connected to my other radios). 

I know the dual channel radio doubles the amount of data coming in but ironically, I've been able to use the dual channel mode w/ HDSDR (controlling phasing through the Afedri control panel) on an even older (2006!) intel imac running windows, so not sure what's going on w/SDRDX on my mac.

Do i need a super duper computer w/ tons more RAM to get this to work on the mac? 

Started with CW transmission...."BEGINNING TRANSMISSION...FOXY? BEGINNING TRANSMISSION" then into music, some fussing about equipment (I think!)
0200 UTC: Station ID
0203 UTC: voiceover

S6...weakish signal, but very audible.

Shortwave Broadcast / WJHR 15555 USB 1711 UTC 16 JAN 2023
« on: January 16, 2023, 1713 UTC »
Weak signal <S2, but very good audio considering.  Religious programming. 

North American Shortwave Pirate / UNID 6925 AM 2014 UTC 06 AUG 2022
« on: August 06, 2022, 2015 UTC »
Guessing this is a pirate...AM signal but bad modulation.  Unless it's just noise or something else....

2024 UTC: Good signal S3 or so, modulation is still very rough.

General Radio Discussion / equipment auction
« on: August 05, 2022, 1329 UTC »
For once, facebook sent me an ad that was actually relevant....pointing to an online auction for some radio gear.  Since my dream of picking up a boat anchor for pennies has been squashed, i thought i'd share the love...


Weak USB signal, blues followed by SSTV (maybe ML280, caught it late), then more blues.  Fading into QRN at 0229 UTC.
0233 UTC...more SSTV but i've got blobs of QRM crawling across the band now :(

General Radio Discussion / Moskva SOS?
« on: April 14, 2022, 0240 UTC »

General Radio Discussion / SAR based radar interference tracker
« on: March 20, 2022, 2047 UTC »

General Radio Discussion / Russian HF
« on: March 04, 2022, 1450 UTC »
From the Scan-DC mailing list; no idea of how valid these are.

3920.00        USB      Working stations in rear bases or Russia
4029.50        USB      Tactical in-country, jammed with screaming
woman and "Rooster" jammer loops
4090.50        CW      Endless 5L groups in Cyrillic, unknown origin
4128.50        CW      Endless 5L groups in Cyrillic, unknown origin
4220.00        USB      Duplex for mobiles wkg control on 5125 kHz
4380.00        USB      “Basis”  Kaliningrad ATC
4395.00        CW      Endless 5L groups in Cyrillic, unknown origin
4397.00        USB      Tactical artillery coordinates etc, jammed by
4421.00        USB      Unknown air use
4610.00        USB      Tactical artillery coordinates etc
4625.00        USB      S28 - (The Buzzer) - no MONOLITH heard, but
continuous jamming and pirate radio stations being weird. Ukraine
national anthem. Waterfall pictures. Screaming pig jammer.
4649.50        USB      Possible Tank Commanders main active channel,
possible Artillery, bearings/grid numbers in Russian, very busy but
now seems dead
4651.00        CW      Russian Navy Maritime Patrol/ ASW a/c ground control
4913.00        CW      Endless 5L groups in Cyrillic, unknown origin
5050.00        USB      Jamming
5125.00        USB      Suspected Russian mil command channel, mostly
hearing jamming - the pig loop, Ukraine patriotic music, loop of
Russian voice "Go back to Russia."
5130.00        USB      Reported Ukraine MOD use, unverified
5293.00        CW      RMP-Russian Navy Baltic Fleet HQ, broadcast
messages for Baltic Fleet collective REO in Cyrillic, “KARTA,” loud at
5331.00        USB      Russian military comms, Rooster jamming
5784.00        USB      Korsar, Air Force transport control, primary
ground channel
6460.70        CW      RMP, like 5293
6552.00        CW      Russian Navy MPA/ASW air. Duplex w/6752
6752.00        CW      Russian Navy MPA/ ASW ground. Dx w/6552

7050.00        LSB      "40 Meter Radio War," stations jamming each
other, similar activity on 7055 and other frequencies
7933.00        USB      Very active Russian mil in Kyiv area, heavy
pig jammer and similar, now seems dead
8112.00        CW      Russian Air Force - Ground control for bombers
and tankers. A/c on 8990
8131.00        USB      Russian Air Force - Bombers and tankers.
Katolik wkg Balans, Russian Air Force Moscow
8821.00        CW      Russian Navy, "S" marker and aircraft duplex
with ground on 8830
8830.00        CW      Russian Navy ground, aircraft transmit 8821
8990.00        CW      Russian Air Force ground, aircraft transmit 8112
9741.00        ISB      Very busy command channel, Russian military
with coordinates, LSB and USB duplex
10021.00      CW      Russian Navy Maritime Patrol/ ASW a/c ground control
18030.00      USB      Korsar: Russian Military Transport Aviation HQ,

North American Shortwave Pirate / UNID 6946 USB 2336 UTC 24 FEB 2022
« on: February 24, 2022, 2338 UTC »
Tuned in at 2336.  S3, strong audio.  Iron Maiden-Two minutes to midnight
2339 UTC: Iron Maiden-Two minutes to midnight.
2346 UTC: OTA

Shortwave Broadcast / EBC Radio 7110 AM 0407 UTC 29 Jan 2022
« on: January 29, 2022, 0407 UTC »
EBC Radio or Radio Ethiopia.  Noisy signal, S2 but can hear singing and voices. 

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