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WA6LIE > MIRFAN 17.07.99 11:42l 99 Lines 3912 Bytes #999 (0) @ AMSAT
BID : WA6LIE41680
Read: GUEST OE7FMI
Subj: HOW TO WORK MIR PT.1
Path: DB0AAB<DB0FSG<DB0SL<DB0RGB<OK0PPL<OK0POK<9A0YRB<PP5BLU<WB0TAX<N7NEI<
WH6IO<N6EEG<N6IYA<KI6EH<WA6LIE
Sent: 990717/0243 41680@WA6LIE.#WCCA.CA.USA.NOAM
HOW TO WORK R0MIR-1
The MIR Space Station is currently orbiting the earth about every
95 minutes while traveling at roughly 17,000 MPH. Due to the fact
that MIR is a moving object, and radio frequencies being involved
here, Doppler corrections may be needed. On the 2 meter band, the
Doppler is a maximim of 3.5 khz on a pass directly overhead (90 degrees).
On a pass say 10 degrees above the horizion, the Doppler is small
about 1 khz. This can be a very important factor in working the packet
Personal Message System. This is because packets may become distorted.
Here are some items to look at in your station for sucessful attempts.
Note: Doppler on 2 meters is really not too valid unless there will be
a pass in excess of 45 degrees or so above you horizion. Your milage
will vary.
1. LOCATION
If you are in a bad location where it might be difficult to get
a signal out, you might be limited to the number of passes that
you can work. You might want to look into a simple 1/4 wave 2 meter
groundplane. This antenna has a good lobe looking up. (pre-amp suggested)
Another common antenna is a J pole, and is a good antenna for this.
If you are in the clear to your horizions, you have it made.
However, Doppler and antenna type will be your disadvantage.
For the average HAM station running say a 50 watt radio, and a J pole
antenna has a great advantage on MIR passes that are up to about
20 degrees above the horizion! Doppler isn't a real consideration
and your antenna pattern is ideal for something up to 20 degrees
above the horizion, or a bit more! Most radios will work, and no
frequency corrections are needed. Doppler up on UHF is around 10 KHZ
and Doppler compensation is needed! A MUST for SAFEX II or any UHF
satellite operations.
Note: SAFEX II repeater is semi operational.
437.950rx/435.750tx PL 141.3
2. TRACKING
You will need some satellite tracking software to know when and where
MIR will be in your area. There is alot of tracking software available
on the internet. I use STSPLUS, and have for over 12 years. Keplerian
information on MIR and other satellites is updated twice weekly, and can
be found on your local BBS.
3. FREQUENCY
The frequency is 145.985 SIMLPEX World Wide.8(1200 baud packet and Voice)
Note: This frequency is subject to change. Look for MIREX UPDATES!
4. PACKET WISE
If you are not familar with packet connections or mailboxes, do some
expermentations on the ground first before trying to operate MIR.
The TNC on MIR is a Kantronics KPC-9612+ V 8.1 and is operating at
1200 baud ONLY. Here is the HELP that you would get on R0MIR-1 when
using the Help (H) command.
B(ye) PBBS WILL DISCONNECT
E(dit) n [BPTYNFH] [>tocall] [<fromcall] [@BBS] "old" "new"
H(elp) THIS LIST!
J(heard) CALLSIGNS WITH DAYSTAMP
J S(hort) HEARD CALLSIGNS ONLY
J L(ong) CALLSIGNS WITH DAYSTAMP AND VIAS
L [x [y]] [;] LIST MESSAGES x THRU y YOU CAN READ
L <|> call LIST MESSAGES FROM OR TO CALL
LB LIST BULLETINS
LC [cat] LIST CATEGORIES
LL n LIST LAST n MESSAGES
LM(ine) LIST UNREAD MESSAGES ADDRESSED TO YOU
LO [+|-] LISTING ORDER
LT LIST TRAFFIC
LTn DISPLAY LOCATION TEXT n=1-4
K(ill) n DELETE MESSAGE NUMBER n
KM(ine) DELETE ALL READ MESSAGES ADDRESSED TO YOU
R(ead) n DISPLAY MESSAGE NUMBER n
RH n DISPLAY MESSAGE n WITH HEADERS
RM(ine) READ ALL MESSAGES ADDRESSED TO YOU
S(end) call SEND MESSAGE TO callsign
S[B|P|T] call SEND BULLETIN, PRIVATE, or TRAFFIC
Please don't use the Help command on MIR. This is STANDARD to MOST
TNC's and doing so just limits the use of MIR by other stations.
**** There can only be ONE user connected to R0MIR-1 at a time. ****
<end of part 1>
Space Related messages are filed on SEABBS for future reference.
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