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  Topic: Better mode and settings for SSTV (1 replies)
#1     Fri Dec 08, 2006 5:44 pm
JA1SCW
Atsugi, Japan
 
Join Date: Nov 2006
Posts: 10
Subject: Better mode and settings for SSTV

I would like to recommend the followings to send/receive better pictures in SSTV over CQ100.

1, Change center frequency from the default value of 1900Hz down to 900Hz.

This will bring you better signal to noise ratio that should improve edge noise dramatically though you may have random noise with small sizes and low levels which might be allowable. Unfortunately we may not be able to change frequency setting of MMSSTV but MixW.

2, Use TTT mode which is far robust under internet environment than the other modes. Again, only MixW provides TTT mode. Please check pictures by visiting my BLOG at http://sky.ap.teacup.com/ja1scw/. Thanks and 73! de JA1SCW

For Easy Clock Adjustment, I have posted a sound file and picture created by using SMPTE Color Bar. Clock accuracy looks not good enough yet. I will tune clock settings by Dec 16 and update ASAP. The file can be downloaded by clicking http://www011.upp.so-net.ne.jp/ja1scw/SSTV.wav. 73! de JA1SCW
Dec 12, 2006
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#2     Fri Dec 08, 2006 8:12 pm
W7RJR
Spokane, WA
 
Join Date: Oct 2006
Posts: 114
Subject: SSTV

Upon reading this post from Satoru I met him on 14.230 Mhz and tried the settings he suggested and I must report that it represents a significant improvement in image quality. There was a slight issue with synchronization and shifting of the image but the quality was exceptionally good.

Now if we can alter the settings in MMSSTV to match.

73
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