Welcome to the new FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
Need the latest SmartSDR, Power Genius, Tuner Genius and Antenna Genius Software?
SmartSDR v3.8.21 and the SmartSDR v3.8.21 Release Notes
SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
Power Genius XL Utility v3.8.9 and the Power Genius XL Release Notes v3.8.9
Tuner Genius XL Utility v1.2.11 and the Tuner Genius XL Release Notes v1.2.11
Antenna Genius Utility v4.1.8
SmartSDR v3.8.21 and the SmartSDR v3.8.21 Release Notes
SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
Power Genius XL Utility v3.8.9 and the Power Genius XL Release Notes v3.8.9
Tuner Genius XL Utility v1.2.11 and the Tuner Genius XL Release Notes v1.2.11
Antenna Genius Utility v4.1.8
If you are having a problem, please refer to the product documentation or check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.
Free DV development ideas
All DV modes have an issue in QSB/QRM/QRN situations: The data stream
gets interrupted and needs awhile to resynchronize.
All methods of error correction etc. won't help much in a dropout.
Digital data modes like PACTOR
work around this by using error correction and resending unacknowledged packets and switching to robust modes until the data packets are acknowledged.
Can't do that to DV in a "normal" QSO situation, or speech would be too much delayed.
I wonder if it wouldn't be possible:
1. To use DV until QSB starts to interrupt the data stream and then switch to SSB and switch back to DV as soon as the connection is reestablished? That should be possible. The human brain rules here and makes it possible to read SSB signals which are almost fading away into the noise.
2. To develop a DV "voicemail" mode, where all you are saying is compressed into voicemail packets, which could be resent until acknowledged by the receiving station, where it would be decompressed and replayed. This mode could be optionally used in difficult QSB/QRN/QRM situations.
BTW we have got a D-Star and a DRM repeater here at Karlsruhe and the same applies to mobile and portable stations: Lots of R2D2 interruptions.
gets interrupted and needs awhile to resynchronize.
All methods of error correction etc. won't help much in a dropout.
Digital data modes like PACTOR
work around this by using error correction and resending unacknowledged packets and switching to robust modes until the data packets are acknowledged.
Can't do that to DV in a "normal" QSO situation, or speech would be too much delayed.
I wonder if it wouldn't be possible:
1. To use DV until QSB starts to interrupt the data stream and then switch to SSB and switch back to DV as soon as the connection is reestablished? That should be possible. The human brain rules here and makes it possible to read SSB signals which are almost fading away into the noise.
2. To develop a DV "voicemail" mode, where all you are saying is compressed into voicemail packets, which could be resent until acknowledged by the receiving station, where it would be decompressed and replayed. This mode could be optionally used in difficult QSB/QRN/QRM situations.
BTW we have got a D-Star and a DRM repeater here at Karlsruhe and the same applies to mobile and portable stations: Lots of R2D2 interruptions.
1
Comments
-
Good ideas, Alex. I've thought about the same things myself. You might want to join the FreeDV Google Group and discuss that with the folks that are designing this mode. To date, we've only run others' digital modes rather than creating our own (you didn't want another proprietary digital mode did you?). I know they are still doing development. The group is here: https://groups.google.com/forum/#!forum/digitalvoice1
-
Thanks, Steve, will look at the DV group.
0
Leave a Comment
Categories
- All Categories
- 296 Community Topics
- 2.1K New Ideas
- 542 The Flea Market
- 7.6K Software
- 6.1K SmartSDR for Windows
- 148 SmartSDR for Maestro and M models
- 375 SmartSDR for Mac
- 252 SmartSDR for iOS
- 239 SmartSDR CAT
- 175 DAX
- 359 SmartSDR API
- 8.8K Radios and Accessories
- 7K FLEX-6000 Signature Series
- 59 FLEX-8000 Signature Series
- 868 Maestro
- 45 FlexControl
- 849 FLEX Series (Legacy) Radios
- 814 Genius Products
- 426 Power Genius XL Amplifier
- 283 Tuner Genius XL
- 105 Antenna Genius
- 249 Shack Infrastructure
- 170 Networking
- 410 Remote Operation (SmartLink)
- 130 Contesting
- 656 Peripherals & Station Integration
- 126 Amateur Radio Interests
- 891 Third-Party Software