HFU HF Underground

Technical Topics => Software => Topic started by: flexoman61 on August 23, 2015, 1619 UTC

Title: MMSSTV Question
Post by: flexoman61 on August 23, 2015, 1619 UTC

My lame computer skills are going to show,
but how do I adjust the slant on my SSTV
images?

I don't see a lot of settings.

Attached images show it starting on left side
and it gradually skews as image continues
to decode.

Thanks

Title: Re: MMSSTV Question
Post by: Zoidberg on August 24, 2015, 1849 UTC

It's been awhile since I've needed to adjust MMSSTV - probably 2012 on this PC.  It's affected by the sound card clock speed, which may drift over time.  There's an easy drag to adjust method using any standard time signal frequency as a source.  This tutorial explains it well (http://www.worldsstv.com/slant/).

Title: Re: MMSSTV Question
Post by: radiogaga on August 25, 2015, 1950 UTC

Try options tab>setup mmsstv>rx tab>check box for auto slant, then click ok.

hope this helps.

Lex instructions are good for tx slant adjustment, spot on

rgg

Title: Re: MMSSTV Question
Post by: Token on August 25, 2015, 1959 UTC

RGG responded literally as I was typing.

The tutorial Lex linked to is for hams that will both receive and transmit SSTV.  Its stance of not using auto slant is solid advice if you are going to both RX and TX.  But from a purely receive application there is no reason not to use auto slant, in fact it is preferred.

My advice for people receiving only, do the alignment as defined in the tutorial, and after complete then select Auto Slant as circled in the 2nd image on that page.  If you do not select Auto Slant then anyone who transmits with an incorrectly adjusted slant will appear slanted to you.  Having Auto Slant not de-selected is great if everyone is correctly aligned, but if anyone is not then Auto Slant can save an image.

T!