Slow Scan TV Net
Packet Training Net
APRS Training Net
146.90 MHz
repeater
Every Tuesday
at 8:00 p.m.
local time with the exception of meeting nights, which are the third
Tuesday
of each month.
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Our standard
software is MMSSTV.
Our standard SSTV mode is Robot 36.
Twice a year SSTV Drill Information-
Click here to download
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Background:
During the last few years SSTV is in more demand by our served
agencies. They would like to take advantage of the capability and the
information provided by the images.
Purpose:
This exercise will allow participants to get experience in SSTV
reception and transmission and exchange ideas and share in learning
about the mode and possible uses.
General Conduct of the Exercise:
The exercise will begin Saturday, 2/26/05 at 0900 hrs. and end Saturday
2/26/05 at 1200 hrs.
Transmit and receive as many SSTV images as you can in the three hour
period.
Send a report to wc7eoc@wc7eoc.or.usa.naom via packet or n7qqu@arrl.net.
The report format is in Attachment # 1. Reports must be received by
Monday 2/28 at 2400 hours.
Stations can work as teams or individuals.
Frequency for SSTV is 147.36+ repeater 100 pl. or 147.54 simplex
Please use the repeater to coordinate SSTV transmissions.
Results and all reports will be posted on the
Washington
County
ARES/RACES website: www.washcoares.org.
Attachment # 1
Reporting
Send report to:
wc7eoc@wc7eoc.or.usa.noam
or
n7qqu@arrl.net
Use this format with this information ..
Participating station call sign -
Participating station location -
Portable/Mobile station Yes - No
(20 point bonus for Yes)
Emergency power Yes - No
(20 point bonus for Yes)
List SSTV stations received:
(10 points each)
List number SSTV images received:
(5 points each)
List number SSTV images transmitted:
(10 points each)
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Sample pictures
were
sent
using a Kenwood VC-H1 and received using MMSSTV software.
Event was the
2004 Race
for the Cure in downtown Portland.
Guidelines for MMSSTV Slant Adjustment
Or what to do with the smiley face.
Prepared By Rick WBØVZW
1. You have to have a known good
reference station that has no problems with slant on xmit or receive.
This station is the All Seeing and All Knowing Reference Station from
this point on in this explanation.
2. Now that Item #1 has been
established, Lets Assume that you are the new kid on the block and that
you have been receiving pictures and have adjusted the timing clock
numbers to give you straight pictures on receive and now you want to
transmit one. Ok go ahead and do it too it.
3. The Reference Station receives
your picture and clicks on the sync tab and then the Smiley Face and
eventually MMSSTV gives him or her a correction factor to make his
clock match your clock. Since this station is the defacto standard,
they will not be inclined to change anything on their end. Instead,
they will give you a number that represents the TX Offset value that
you need to use for your Transmit. This number will actually be the
opposite polarity of the number shown in their software when they ran
the Smiley Face on your picture. If the Reference station tells you
-1.50, go into MMSSTV Option/Setup MMSSTV/Misc tab and set this value
into the TX Offset window of the Clock adjust portion of the screen.
It's just that simple. You must keep in mind that the Smiley Face
feature is designed to adjust the receiving stations clock to match
your transmit and since the receiving station in this case, is
the Reference station, they will use the Smiley Face calculated numbers
to give you a transmit offset adjustment factor.
4. Again using the Reference
Station as the de facto standard, this is what happens on their end
when they receive your picture.
A. If your
clock number is set to low they will receive your picture with the
bottom shifted to the left.
B. If your
clock number is set to high they will receive your picture with the
bottom shifted to the right.
5. Now with reference to you
receiving pictures, just the opposite will occur on your end if you are
not yet receiving pictures that are straight with reference to steps 4A
and B above.
A. If your
clock number is set to low you will receive a picture that has the
bottom shifted to the right with reference to the transmitting station.
B. If your
clock number is set to high you will receive a picture that has the
bottom shifted to the left with reference to the transmitting station.
There it all is in a nutshell and this is not
intended to make anyone feel stupid, it is my attempt to help make it
simpler for all so we can spend more time transmitting and less time
straightening out slants.
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