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DF3VI > TECHNIK 24.04.04 11:01l 23 Lines 967 Bytes #999 (998) @ WW
BID : O4EDB0OVN00B
Read: GUEST OE7FMI
Subj: Re^2: Co-ax loss aand VSWR
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0ACC<DB0GOS<DB0OVN
Sent: 040424/0835z @:DB0OVN.#NRW.DEU.EU [BCM West<>Link-Neuss] obcm1.05b20 LT:9
From: DF3VI @ DB0OVN.#NRW.DEU.EU (Patrick)
To: TECHNIK @ WW
X-Info: Sent with login password
VK3JMA wrote:
>From my understanding, it is all 7bit mail.
WRONG! (Read The Fine 7plus.doc Manual, hi!)
7plus uses all eight bits of a byte, not seven like ASCII-codes, UUE and
Radix95 do. Yet it does not use all 256 different codes, but leaves out
"dangerous" one like control-codes (char. 0 to 32) and others.
So 7plus uses 216 out of 256 possible codes, and this encoding inflates files
by a factor of 256/216 (actually, it's a little bit more, because every line
of 70 characters also has a 2-byte-CRC included). So 7plus is actually a
Radix216-encoding, using 7 3/4 bit of a byte.
Data streams, that are not fully 8-bit-transparent, cannot transport 7plus
files without corruption. While 7plus can auto-correct small errors
(one wrong character per line), larger errors need correction files.
73, Patrick
P.S. G0FTD's 7plus-parts were received error-free here.
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