Doesn't SAR use a moving digi on occasion only using a unique path? Such as SARn-N? If so, a storm chasing event could be managed the same way. Best regards, Fred
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Chuck Kimball Sent: Monday, January 11, 2010 13:08 To: [email protected] Subject: [tracker2] Mobile Digipeating (Was Smart Beacon) Keep in mind that for every digipeater you put out there you HALVE the amount of traffic the system can handle. Not exact, but for example if it takes one second for each UI Packet you can pass 60 packets in a minute, if you add a digipeater, It hears the packet, and repeats it, now takes two seconds and you can only move 30 unique packets a minute. Add another digipeater that is overlapping a large area of the original digipeater (your mobile), and you're now down to 20 unique packets a minute (original transmission, the first digipeater, the second digipeater = 3 seconds), etc. This is the simple explanation not accounting for collisions, etc. If it's really needed for coverage then add a digipeater, but consider using just a fill in (WIDE1-1) only. If it's not going to add much to the coverage you're just reducing the air time available, and increasing the likely hood of collisions and lost packets. For Temporary to fill in coverage in an area, most definitely a suitable mobile use, but on all the time, you more likely just adding congestion to the system as you drive around. Lots of other parts to the digipeater discussions, but probably more suited for another list. Chuck Kimball n0nhj Peter Dakota Summerhawk wrote: Garett, Why is running a mobile Digi frowned upon? We were thinking about doing this for some of our storm chasing activities come here this spring. Park a vehicle in one place and let the others digi through it back to the nearest stationary digi. That way we can cover more ground. If you can let me know why this is frowned upon that would be great. Thanks Peter Summerhawk-N0WRE
