Lately we have been trying to determine why some listeners have less success with Olivia 64-2000 than with MFSK32, even though, in theory, Olivia 64-2000 should be more robust. I suggested that the problem might be related to the bandwidth of the receiver, given that Olivia 64-2000 is 2000 Hz wide.
Christopher, K6FIB, a key adviser to VOA Radiogram, thinks the performance of Olivia is related to the processing power of the PC or the mobile device. Paul in Europe provided evidence of this in his TIVAR Android shoot-out. Other listeners wonder if it could be other components, such as the microphones on Android devices, which would be important if acoustic coupling from the radio to the device is used.
VOA Radiogram this weekend will include an eight-minute story in Olivia 64-2000. This will allow further experimentation. If we enjoy poor reception conditions, the experiments will be even more interesting.
Here is the lineup for VOA Radiogram, program 162, 7-8 May 2016, all in MFSK32 except where noted:
2:41 Rubbish-burning experiment in Norway*
7:55 Olivia 64-2000: UAE may make mountain to change climate*
18:34 MFSK32: FCC considers change to amateur data regulations*
23:37 Closing announcements*
* with image
Please send reception reports to firstname.lastname@example.org.
VOA Radiogram transmission schedule
(all days and times UTC):
Sat 0930-1000 5745 kHz
Sat 1600-1630 17580 kHz
Sun 0230-0300 5745 kHz
Sun 1930-2000 15670 kHz
All via the Edward R. Murrow transmitting station in North Carolina.
The Mighty KBC will transmit a minute of MFSK32 Sunday at about 0220 UTC (Saturday 10:20 pm EDT) on 9925 kHz, via Germany. This is part of the KBC broadcast to North America at 0000-0300 UTC on 9925 kHz. Please send reception reports to Eric: email@example.com .
DigiDX will transmit DX news in MFSK32 and perhaps other modes on its usual schedule:
Sunday 2130 UTC - 15770kHz via WRMI Florida
Sunday 2330 UTC - 11580kHz via WRMI Florida
Monday 2000 UTC - 6070kHz via Channel 292 Germany
Consult https://www.facebook.com/digidx/ for any additions or changes to this schedule.
Thank you for your reports to VOA Radiogram last weekend. Now that the gallery for program 159 has finally been sent, I will compile a gallery for program 137 (November 15-16, 2015) and maybe send it out this weekend.
I hope you can tune in and write in this weekend.
Kim Andrew Elliott
Producer and Presenter
Twitter: @VOARadiogram (especially active before, during, and after broadcasts)