VOA Radiogram @ 5745 kHz, 23 Jun 2013 0230 UTC

EasyPal with 4-QAM (QPSK)

Whoops, I cut off the progress bar, but it took about 3/4 the segments to successfully receive and no segment failed to decode. Previous 16-QAM transmissions only required 1/3 or so of the total segments.

PCJ Radiogram @ 9955 kHz 23 Jun 2013 0227 UTC

The Mighty KBC Digital Text @ 9925 kHz, 23 Jun 2013

MT63-1K with VOA intro music as co-channel interfrence

VOA Radiogram @ 5745 kHz, 16 Jun 2013 0230 UTC

Using AMS LSB

MFSK-16 with injected co-channel noise

MFSK-16 with -6 dB attenuation and noise

MFSK-16 with -12 dB attenuation and noise, decoding errors begin to appear

MFSK-16 with noise removed and no attenuation

EasyPal image

PCJ Radiogram @ 9955 kHz 16 Jun 2013 0227 UTC

The Mighty KBC Digital Text @ 9925 kHz, 16 Jun 2013

Note that the PCJ Radio International test transmission, on the same frequency and time slot, was 20 S-units weaker.

Radio Australia Radiogram @ 21740 kHz 9 Jun 2013 2150 UTC

PCJ Radio International Test Transmission @ 9925 kHz, 10 Jun 2013 0000 UTC

Interference in the upper sideband, so switched to AMS LSB:

Transmission began S9+10 to S9+20, increasing to S9+20 to S9+30 in the last half hour.

Radio Australia Radiogram @ 9580 kHz 9 Jun 2013 1230 UTC

Interference from CRI on 9570 kHz

100% decode and decent MFSK-32 image.

PCJ Radiogram @ 9955 kHz 9 Jun 2013 0227 UTC

WRMI always drifts around 9955 kHz.

There was some fairly wide interference from a station on 9965 kHz. 100% decode anyway.

The Mighty KBC Digital Text @ 9925 kHz, 9 Jun 2013

List of Mighty KBC digital text transmissions

https://soundcloud.com/swl0

There are also a couple of early VOA Radiogram episodes. I originally created this under the mistaken assumption that I could upload unlimited audio as long as I didn't exceed a monthly quota. I'm down to my last 4 minutes, so after next week's KBC transmissions I'll start uploading them to archive.org.

VOA Radiogram @ 5745 kHz, 9 Jun 2013 0230 UTC

Notes:

The flmsg payload had unclosed p tags and used an invalid tag and tag sequence (</big><big style>)

During the -9 dB MFSK-16 transmission the transmitter went off air for about 10 seconds

In the -9 dB MFSK-32 transmission, there was "In a decision 5Or, Apple won a court decision that Samsung had violated several of its patents." That was the only MFSK decoding error.

MFSK-16 with song as co-channel interference

MFSK-16 -9 dB suppressed with song as co-channel interference

VOA Radiogram going off air

MFSK-32 -9 dB suppressed with song as co-channel interference

EasyPal image

List of VOA Radiogram recordings

I had started a tumblr, but it's just more convenient to post to one place. Nevertheless, anyone interested in high SNR VOA Radiogram recordings up to now can check out http://swradiograms.tumblr.com/. Going forward, any recordings will be linked on this blog.

VOA Radiogram @ 5745 kHz, 2 June 2013 0230 UTC