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EI2GYB > PACKET 07.12.18 03:25l 97 Lines 4666 Bytes #999 (0) @ WW
BID : 3325_EI2GYB
Read: GUEST
Subj: INTRODUCTION TO PACKET RADIO - Part 17
Path: IW8PGT<CX2SA<ZL2BAU<EI2GYB
Sent: 181207/0113Z 3325@EI2GYB.DGL.IRL.EURO BPQ6.0.16
INTRODUCTION TO PACKET RADIO - Part 17 - by Larry Kenney, WB9LOZ
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:
1 - 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)
2 - The UNPROTO command is used for setting the transmit path for both
beacons and Cqs. (Parts 3 and 13)
3 - 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)
4 - The MCON command (Monitor while CONnected) is used to monitor other
traffic on the frequency while you're connected to another station.
(Part 3)
5 - 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)
6 - 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)
7 - 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)
8 - 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)
9 - 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)
10 - BBS commands:
a. To receive a list of messages you enter L
b. To read message 47134 enter: R 47134
c. 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.
d. 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
e. To change your home BBS from W6ABC to W7XYZ you would enter: NH W7XYZ
(Parts 5, 6, 7 and 8)
11 - 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)
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)
13 - 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)
14 - 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)
15 - 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 freq-
uency 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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