Packet is using Carrier Sense Multiple Access, CSMA.

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(CDMA is Code Division Multiple Access, a form of spread spectrum)

VARA HF or VARA FM is not CSMA system since the channel is reserved for one QSO at one time. In practice this is the only way to use adaptive modems. Sharing the channel in packet radio fashion ?would allow the channel to change too much between transmissions.

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CSMA packet radio would work well only if all stations can copy each other. Google for ”hidden terminal” and ”exposed terminal” problems.

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73, Ilkka OH3NJC

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Not true.? Packet incorporates CDMA, carrier detect multiple access.? It deals with collisions quite well.

VARA FM, so far I know, does not listen for a clear frequency therefor does not detect collisions.

The truth is in the starlight.

Dan Croskrey, NV2Z, NNX0EM, WRBU785

Otis Orchards, WA, U.S.A.

EWA, District 9, Spokane County AEC

Winlink RMS NV2Z-10 VARA FM 145.51 MHz

Winlink RMS NV2Z-10 VARA FM 432.425 MHz

Owner YSF repeater 442.925 + Tsql 100 Hz AMS in/AMS out

I know how packet radio deals with collision avoidance: poorly. How does VARA (specifically FM) deal with it?

Orv W6BI

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