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LU9DCE > PACKET 28.12.16 14:44l 112 Lines 5548 Bytes #999 (0) @ WW
BID : 16179_LU9DCE
Read: GUEST
Subj: PACKET RADIO - PART 17
Path: IW8PGT<CX2SA<LU9DCE
Sent: 161228/1334Z @:LU9DCE.TOR.BA.ARG.SOAM #:16179 [TORTUGUITAS] $:16179_LU9DC
From: LU9DCE@LU9DCE.TOR.BA.ARG.SOAM
To : PACKET@WW
INTRODUCTION TO PACKET RADIO - PART 17
by Larry Kenney, WB9LOZ
PACKET RADIO REVIEW - ANSWERS
How did you do on the review quiz in the previous part of this
series? If you haven't taken it, you might want to read part 16
and take the quiz now before reading any further.
Here are the correct answers and the series part numbers where you
can read more about the subject:
Answer C is correct. The three TNC modes of communication
are Command, Converse and Transparent. Command mode is for
communicating with the TNC. Converse mode is for normal
QSOs, connects to a BBS or mailbox, etc. and Transparent
mode is used for binary file transfer. (Parts 2, 3 and 14)
The UNPROTO command is used for setting the transmit path for
both beacons and CQs. (Parts 3 and 13) The CHECK command is
used for setting a timeout value in your TNC. If set to a value
other than zero, the TNC will attempt to recover a connection
after a certain specified time if nothing is received from
the other station. This command is used in combination with
the AX25L2V2 command. (Part 13) The MCON command (Monitor
while CONnected) is used to monitor other traffic on the
frequency while you're connected to another station. (Part 3)
When monitoring, the asterisk indicates the station that you
actually heard the packet from. The MRPT command must be ON
for the monitor display to show digipeaters. (Part 2 and 3)
The packet node network improves communications because packets
are acknowledged between your station to the first node, and
then node to node to the destination. A packet doesn't have
to reach the destination before an ack is returned. (Parts 4,
10 and 11) When using the node network (no matter who you're
connected to) you disconnect by going to command mode on your
TNC and entering a D, just like at other times. Some nodes have
the B (Bye) command available, so a B might also work. The fact
that you're using several nodes or are connected to a distant
station makes no difference. The network will take care of
disconnecting all stations and links. (Parts 4, 10 and 11)
N6ZYX-2 would appear as N6ZYX-13 if he connects to you using a
node. The nodes change the SSID using the formula 15-N. (Part
10) The two most probable causes for a packet not to get through
are collisions with other packets on the frequency and noise due
to weak signals. (Part 15) BBS commands: (Parts 5, 6, 7 and 8)
To receive a list of messages you enter:
L
To read message 47134 enter:
R 47134
To download a file in the General (G) directory called
FCCEXAMS.LST you'd enter:
D GENERAL FCCEXAMS.LST or DG FCCEXAMS.LST
depending on the software being used by your BBS. To send
a personal message to Jim, WA6DDM, you would enter:
SP WA6DDM @ W6PW.CA.USA.NOAM
If his callsign was known in the White Pages database on
your BBS, you would only have to enter:
SP WA6DDM
To change your home BBS from W6ABC to W7XYZ you would enter:
NH W7XYZ
If you wanted to send an NTS message to Tom Smith, 123 Main
Street, in Keene, NH 03431, you would enter the following at
the BBS prompt >
ST 03431 @ NTSNH
(Parts 6 and 12) A message with a STATUS of BF means that the
message is a bulletin and that it has been forwarded to all
stations that are supposed to receive it from the BBS you're
using. (Part 8) When entering the SUBJECT of a bulletin,
you should give information that will help users listing your
bulletin to determine whether or not they should read it. If
you're entering a SALE or WANTED bulletin, tell what the item
is and give the manufacturer and model. For an INFO bulletin
indicate what you're offering information about. (Parts 6 and
8) To find the call of the HOME BBS of your friends, use the
White Pages database. If the BBS you're using has the WP feature
enabled, you'll find the I command (or Q command on some systems)
to be useful, otherwise send an inquiry to your regional WP
server or the national WP server. (Part 9) The maximum value for
MAXFRAME is 7. MAXFRAME is the number of packets transmitted by
your TNC contiguously, and the number of unacknowledged packets
the TNC can have outstanding. You decrease MAXFRAME when the
conditions are poor. Your TNC will send fewer packets at one
time, so there will be less information to collide with other
packets on the frequency and less chance of information being
wiped out by noise. (Part 14)
There is no passing grade on the quiz. It was designed for you to
check your general packet knowledge, and you'll have to be your
own judge of that. I hope you did well on it!
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