To test this feature, visit your live site.

Broadcast use FEC and ARQ

Is it possible in a future release to skip KISS/AX25 and replace it with something else for Broadcast so that the Vara possibility to use FEC and ARQ can be utilized. We are using VarAC HF for EMCOMM but are frequently missing someone's reports probably because it can not be interpreated by VarAC/Vara. This could also make it possible to have somewhat longer text-messages.

73/Torbjörn/SM6AYM

8 comments

8 Comments

torbjorn.toreson

Mar 18

Would it be possible to utilize FEC when recieving a brodcast?

torbjorn.toreson

Mar 14

Thanks for the reply Irad. Yes of course, that was wrong thinking from me. One to many can not use FEC and ARQ.

73/Torbjörn

irad d

Mar 14

I did not understand the use case.

For ARQ you have a VARA link which has FEC and ARQ. but limited to one-on-one.

For one to many you use broadcast but as its a one-to-many, you can not guarantee delivery to all as waiting for ACK and retransmissions until every individual gets it will block the CF.

You have a broadcast that ask the other side to send confirmation of receipt but this is a one-on-one broadcast.

What is the other use case you are missing ?

Meir 4Z5PE | QO100<->HF VarAC Cluster

Mar 17

Replying to

It's still more efficient than connecting to 5 stations individually and sending the same message five times. Vmail is super slow on a poor channel! This is a middle ground between connected/vmail and no receipts/acks to broadcasts at all.

1. If the feature is needed, you could use a different channel for ACKs.

2. SUGGESTION: Append all your broadcast ACKs onto your next beacon. You could advance the beacon time a bit if 15 minutes is too long to wait.

If channel congestion is an issue, you could have a channel congestion metric and an automatic congestion reduction that increases beacon delay according to congestion.

Edited

irad d

Mar 17

Replying to

Sure more efficient. It is also more efficient than mail pegions :) Yet the price of this "efficiency" of one user sending one broadcast to 10 people clogging the CF for many (many) minutes for other hundreds is not something I would like to program. The blast radius of such a feature being mis used is too high. Group chats in -20db is never going to be effective in any way.

Meir 4Z5PE | QO100<->HF VarAC Cluster

Mar 18

Replying to

If the message is not delivered to all the desired stations, then the solution is to get a closer station to relay the message to the station who has difficulty hearing you and who did not get the message.