Some of our friends from Cadmidium and Ask IT's Done Ltd visited Isode recently, bringing with them some RapidM HF Data Modems and three HF Radios for a day testing messaging and applications over HF radio.
We had a set up with three HF radios (a Yaesu FT817, a Yaesu FT847 and an Icom IC-7200) and Military Grade RM6 Modems from RapidM. We used small aerials, using very low power ground wave. Tests were done with STANAG 4539 (NAT0 3G) Waveforms mostly operating at 600 bits per second. Link level used the RapidM STANAG 5066 servers and Isode STANAG 5066 clients.
The basic configuration used ACP 142 (Military Reliable Multicast) operating over STANAG 5066. Our whitepaper on Messaging Protocols for HF Radio gives some background into the standards and protocols used. We demonstrated:
- STANAG 4406 Formal Military Messaging, operating according to STANAG 4406 Annex E
- Internet Mail operating over ACP 142, mapping onto STANAG 5066 UDOP (Unreliable Datagram Oriented Protocol) using STANAG 5066 broadcast.
- Both messaging standards operating over Connection Orient ACP 142 mapping onto STANAG 5066 RCOP (Reliable Connection Oriented Protocol) using STANAG 5066 ARQ (reliable data link).
- Multicast Messaging using STANAG 5066 UDOP (STANAG 4406 and Internet Mail)
- Operation in EMCON (Emission Control) with nodes in radio silence (STANAG 4406 and Internet Mail).
- File Transfer by Email (FTBE) (as described in the Isode whitepaper File Transfer by Email)
- Directory Synchronization over FTBE. At 600 bits per second, incremental directory replication with compression at the FTBE level was useful to get good performance.
All in all a very successful day and we'd like to thank all of those involved for the time they put into helping us set all of this up and RapidM for the loan of the modems, and for help with making it all work.