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K0CQ > TECH 19.12.05 21:12l 26 Lines 950 Bytes #999 (0) @ WW
BID : 16169_W0AK
Read: GUEST DL1LCA OE7FMI
Subj: re: A puzzling fault
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<ON0AR<VK6HGR<VK7HDM<K0KCC<KJ6EO<
W9BS<N9LYA<KQ0I<W0AK
Sent: 051213/1901Z @:W0AK.#CIA.IA.USA.NOAM #:16169 [Des Moines] $:16169_W0AK
From: K0CQ@W0AK.#CIA.IA.USA.NOAM
To : TECH@WW
I have found through long experiments that unless a frequency is
totally private with only two users that I get more throughput
(as does bbs forwarding) if maxframe is set to 1 than when set to
7. That's because when there are collisions they almost always
are in the first frame and the protocol has no way of accepting
the other 6 good frames and asking for the first only to be sent.
The protocol can only reject that damaged frame and so all 7 get
sent again.
Some production runs of other TNCs had a problem with the
negative supply caused by the electrolytics in the negative
supply being mounted with reversed polarity. Check those in your
TNC too. Most electrolytics will accept a small reversed voltage
but will act like a zener diode to limit that reversed voltage if
there's impedance in the charging circuit.
73, Jerry, K0CQ @ W0AK.#CIA.IA.USA
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