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sensitivity and range of ax25 broadcast?

I'm trying to compare the sensitivity/range of the ax25 protocol for broadcast vs varahf beacon/chat. After a previous EDM exercise it seems that beacons really get out, but broadcasts not so much. Anyone do any testing or have any info?

Rob ve3ggr

7 comments

Comments (7)

Rob ve3ggr

Dec 06, 2023

Thanks Gary, excellent answer, helps alot.

NC3Z Gary

Dec 06, 2023

www.varac-hamradio.com

vmail outbox has many messages | VarAC

sorry if this is a newbie question but i can't find it in the manual or searching this forum. maybe i don't have a fundamental understanding of vmail. i understand it's not a mail server. but when i get a message from someone, i see an alert to remind me to pick it up. so why are there 9 messag

NC3Z Gary

Dec 06, 2023

Here is 1 post that indicates SL1 (Beacon) is about 9dB more sensitive than SL5 (KISS ASYNC Broadcast)

https://www.varac-hamradio.com/forum/varac-emcomm-discussion-forum/feature-request-broadcast-speed-level-setting

Edited

NC3Z Gary

Dec 06, 2023

There was a post about some imperical numbers a while back, SL1 for the Beacon vs SL5 for the Broadcasts. Let me do a search to find it.

Edited

Demetre - SV1UY (M0SUY)

Dec 13, 2023

Replying to

I wish VARA KISS had a selectable option to work in SL1, 2, 3, 4 or 5. This would be great for BROADCASTS over difficult conditions! Problem is who can convince Jose! Any ideas?

Edited

Rob ve3ggr

Dec 13, 2023

Replying to

Hey Demetre agreed, with our edm group it would be perfect to be able to send a broadcast message with vara protocols, even the low speed one, to all team members on the air to provide basic instructions and frequencies to operate on. Right now it would have to be p2p email and would have to send out hundreds of winlink messages {p2p). Right now we use beacons to allow everyone to know who is there but only call signs. If Jose could do this he would be doing all emergency volunteers a big favor, not to mention people in Grid down to get info in/out or even request help when voice is less useable.

Rob ve3ggr

Demetre - SV1UY (M0SUY)

Dec 13, 2023

Replying to

Yes Rob, JS8 has 4 speeds and it can decode any one of them, so why not VARA. The thing is who can convince Jose to do this. Perhaps an EMCOMM group can do better than any individual!

73 de Demetre SV1UY

Edited

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