Please Edumacate me...

Forum for the promotion and understanding of digital voice on the amateur bands.

Moderator: Global Moderator Team

ka8ypy
Administrator
Posts: 3486
Joined: Thu Jan 26, 2006 11:01 pm
Location: Fine Business and HI HI
Contact:

Postby ka8ypy » Wed Aug 22, 2007 1:32 pm

I will always place the mission first.
I will never accept defeat.
I will never quit.
I will never leave a fallen commrade

User avatar
KB9SXK
98245C-001400-5
Posts: 829
Joined: Tue Dec 19, 2006 10:39 am
Location: Home
Contact:

Postby KB9SXK » Wed Aug 22, 2007 1:41 pm

"I'm with the government, I'm here to help you"

VE6HBD:
"I would have killed for a bear with a working asshole."

W2WTF:
"shut your fat arrogant yankee horses rear up and keep your opinions to yourself."

ka8ypy
Administrator
Posts: 3486
Joined: Thu Jan 26, 2006 11:01 pm
Location: Fine Business and HI HI
Contact:

Postby ka8ypy » Wed Aug 22, 2007 1:53 pm

I will always place the mission first.

I will never accept defeat.

I will never quit.

I will never leave a fallen commrade

User avatar
smokeybehr
98247E-211491-4
Posts: 3241
Joined: Thu Apr 19, 2007 12:58 am
Location: In the muthaf***in' forest, bitch! Where else?
Contact:

Postby smokeybehr » Wed Aug 22, 2007 2:01 pm


User avatar
KC9UZB
98247E-011480-1
Posts: 1289
Joined: Sat Jun 24, 2006 11:10 am
Location: Artist formerly known as M3ECM (Indiana)
Contact:

Postby KC9UZB » Wed Aug 22, 2007 2:17 pm


User avatar
KB9SXK
98245C-001400-5
Posts: 829
Joined: Tue Dec 19, 2006 10:39 am
Location: Home
Contact:

Postby KB9SXK » Wed Aug 22, 2007 2:20 pm

"I'm with the government, I'm here to help you"

VE6HBD:
"I would have killed for a bear with a working asshole."

W2WTF:
"shut your fat arrogant yankee horses rear up and keep your opinions to yourself."

ka8ypy
Administrator
Posts: 3486
Joined: Thu Jan 26, 2006 11:01 pm
Location: Fine Business and HI HI
Contact:

Postby ka8ypy » Wed Aug 22, 2007 3:38 pm

I will always place the mission first.

I will never accept defeat.

I will never quit.

I will never leave a fallen commrade

User avatar
KB9SXK
98245C-001400-5
Posts: 829
Joined: Tue Dec 19, 2006 10:39 am
Location: Home
Contact:

Postby KB9SXK » Wed Aug 22, 2007 4:11 pm

"I'm with the government, I'm here to help you"

VE6HBD:
"I would have killed for a bear with a working asshole."

W2WTF:
"shut your fat arrogant yankee horses rear up and keep your opinions to yourself."

User avatar
Mong
9A247E-211493-9
Posts: 5447
Joined: Sun Jan 01, 2006 2:29 am
Location: Mesquite TX

Postby Mong » Wed Aug 22, 2007 4:38 pm


KB3JUV
MOT1
Posts: 30
Joined: Mon May 07, 2007 10:07 am
Location: Nashua, NH
Contact:

Postby KB3JUV » Thu Aug 23, 2007 12:56 am


User avatar
Mong
9A247E-211493-9
Posts: 5447
Joined: Sun Jan 01, 2006 2:29 am
Location: Mesquite TX

Postby Mong » Thu Aug 23, 2007 7:41 am


User avatar
KB9SXK
98245C-001400-5
Posts: 829
Joined: Tue Dec 19, 2006 10:39 am
Location: Home
Contact:

Postby KB9SXK » Thu Aug 23, 2007 10:47 am

"I'm with the government, I'm here to help you"

VE6HBD:
"I would have killed for a bear with a working asshole."

W2WTF:
"shut your fat arrogant yankee horses rear up and keep your opinions to yourself."

User avatar
mr.syntrx
98247E-211491-4
Posts: 3968
Joined: Wed Jun 23, 2004 2:24 am
Location: HI HI FINE BUSINESS OLD MAN THERE ON THE FINE BUSINESS HIHI QSL
Contact:

Postby mr.syntrx » Thu Aug 23, 2007 4:40 pm


User avatar
Wowbagger
98247E-011400-8
Posts: 1027
Joined: Tue May 23, 2006 10:14 am
Location: Wichita, KS

Postby Wowbagger » Thu Aug 23, 2007 4:55 pm


tvsjr
Moderator - Dayton 2006/2007 Supporter
Posts: 2830
Joined: Wed Jul 21, 2004 5:03 pm

Postby tvsjr » Thu Aug 23, 2007 5:01 pm


User avatar
motorola_otaku
Cock Block
Posts: 6666
Joined: Mon Nov 29, 2004 8:53 pm
Location: Stinkadena, TX
Contact:

Postby motorola_otaku » Thu Aug 23, 2007 5:15 pm

And the sign says you got to have a membership card to get inside.

tvsjr
Moderator - Dayton 2006/2007 Supporter
Posts: 2830
Joined: Wed Jul 21, 2004 5:03 pm

Postby tvsjr » Thu Aug 23, 2007 7:05 pm


User avatar
Wowbagger
98247E-011400-8
Posts: 1027
Joined: Tue May 23, 2006 10:14 am
Location: Wichita, KS

Postby Wowbagger » Thu Aug 23, 2007 7:14 pm


tvsjr
Moderator - Dayton 2006/2007 Supporter
Posts: 2830
Joined: Wed Jul 21, 2004 5:03 pm

Postby tvsjr » Thu Aug 23, 2007 8:18 pm


User avatar
Mong
9A247E-211493-9
Posts: 5447
Joined: Sun Jan 01, 2006 2:29 am
Location: Mesquite TX

Postby Mong » Sat Sep 15, 2007 3:27 pm


User avatar
KB9SXK
98245C-001400-5
Posts: 829
Joined: Tue Dec 19, 2006 10:39 am
Location: Home
Contact:

Postby KB9SXK » Sun Sep 16, 2007 12:05 am

"I'm with the government, I'm here to help you"

VE6HBD:
"I would have killed for a bear with a working asshole."

W2WTF:
"shut your fat arrogant yankee horses rear up and keep your opinions to yourself."

Rijndael
Posts: 6
Joined: Tue Sep 18, 2007 11:48 pm

Postby Rijndael » Tue Oct 02, 2007 10:51 pm

Actually you can get close to 5,000 bps in APCO packet data in IVD. Even peer to peer with a pair of XTS5000 radios you’ll see close to that.

If you location enable the ‘5K the GPS data can be polled via the IVD during voice and carried in the approx 88bps overhead.

But it is more normal to poll the radio periodically with the XML coded GPS data sent at the full packet data rate. In other words the radio can respond to position requests whenever polled without user intervention.

To reduce overheads you can also set the subscriber radios to report positions autonomously at say 5 minute intervals. Looking the transmission it takes a total of 150 ms to send the position report with the 50 ms or so ACK coming in about 50ms later.

Rijndael
Posts: 6
Joined: Tue Sep 18, 2007 11:48 pm

Postby Rijndael » Tue Oct 02, 2007 11:48 pm

Reference Wowbagger’s and other comments the key issue with nonlinear modulation methods is adjacent channel power. While OFDM sounds cool it poos all over the adjacent channels even with a decent class linear amp. Remember that we’re talking land mobile here, that’s neg 60 dB in the adjacent channel (ETSI 12.5 kHz, mileage may vary with FCC rules).

kb9mwr
MOT1
Posts: 24
Joined: Wed Oct 10, 2007 12:45 am
Location: WI

D-Star is a disappoitment

Postby kb9mwr » Thu Apr 09, 2009 12:48 am

Image

Sorry, but I need to vent:
D-Star is only a 4800 baud total data stream equivalent signal. 2400 baud is reserved for actual digital voice, 1200 baud is reserved for FEC (forward error correction) on the digital voice. (This is for callsign and short message data.) Another 1200 baud is reserved for serial data. (This is for APRS, and text messages/text query's.) The sad part is 1200 baud data is what we were doing in the 1980's.

So if 4800 baud can fit into a 6kHz bandwidth, we could have had a 12800 (12.8k) baud total data stream equivalent signal fit into our existing 16 kHz bandwidth plans. This could have left us with 9.2k left for data. Or at the very least more could have been given for the digital voice codec, so that we could use other license free-codecs that sound more natural.

Ham radio needs narrow band as much as the ARRL needs more aging members.

User avatar
Wowbagger
98247E-011400-8
Posts: 1027
Joined: Tue May 23, 2006 10:14 am
Location: Wichita, KS

Re: D-Star is a disappoitment

Postby Wowbagger » Thu Apr 09, 2009 7:05 am

These opinions are mine, not Aeroflex's - if you want service info, manual, or other official support please contact Aeroflex directly.

kb9mwr
MOT1
Posts: 24
Joined: Wed Oct 10, 2007 12:45 am
Location: WI

Re: Please Edumacate me...

Postby kb9mwr » Thu Apr 09, 2009 10:57 am

Sorry about that, thanks for correcting me. Eitherway bps or baud, it's still pathetic and utterly useless


Return to “Astro DStar and other digital voice formats”

Who is online

Users browsing this forum: No registered users and 1 guest