[amsat-bb] MMSSTV and images from ISS
n8hm at arrl.net
Fri Dec 19 14:02:09 UTC 2014
I wasn't listening yesterday, but generally the duty cycle is 180
seconds on and 180 seconds off, so the most you'd ever get in one 9.5
minute pass in two complete images, and only then if you're in the
right place and the first transmission begins right at your AOS.
On Fri, Dec 19, 2014 at 8:58 AM, Richard Lawn <rjlawn at gmail.com> wrote:
> Thanks for clarifying this better than I did Alan! I was sitting at the
> breakfast table when I wrote the initial posting and couldn't remember
> where that setup page was in MMSTV. And yes, the math is simple as long as
> it's divisible by 2. This came up when Dave W0DHB and Ron W5RKN and I were
> getting prepared for the two days of ISS SSTV passes. Happy to pass the do
> on. And you are right again regarding the importance of these parameter
> settings when using my FunCube Dongle or softrock.
> Now we can all look forward to tomorrow and some new images. I was only
> able to get one clean, complete image per pass yesterday so there is little
> hope to grab all 12!
> happy holidays!
> On Friday, December 19, 2014, Alan <wa4sca at gmail.com
>> Excellent point, and one I did as a matter of routine since it is
>> important with SDR rigs. Just
>> looked and it can be found here:
>> Then the Clock section at the bottom of the page.
>> The sound card adjustments will vary slightly depending on the version of
>> the OS you are running, but
>> usually will be under the advanced properties for the device. You can
>> _probably_ use a higher sampling
>> rate for the sound card so long as it is a power of 2 multiple (2,4,8,
>> etc) of the value in MMSSTV.
>> For instance, I use 192k (8x) with no issues. The same applies to most
>> similar software.
>> <-----Original Message-----
>> <From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
>> Behalf Of Richard Lawn
>> <Sent: Friday, December 19, 2014 7:25 AM
>> <To: amsat-bb at amsat.org
>> <Subject: [amsat-bb] MMSSTV and images from ISS
>> <i found out from a friend that there could be one of two related problems
>> <if not adjusted properly. Make sure the sound card you are using is set to
>> <48k not 44.1. In the MMSSTV there is a software adjustment screen, sorry
>> <I'm not sitting in front of the computer, that allows you to set a
>> <parameter to 24000, exactly half of the sound card setting. The MMSSTV
>> <default setting is not 24000 and needs to be set to that. You then should
>> <get good clean images.
>> <I set up both RS-SSTV and MMSSTV and got good images yesterday from both.
>> <73 and happy holidays!
>> <Rick W2JAZ
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