[amsat-bb] 9.6k woes and FoxTelem

[Chris Thompson]

Kevin,

To preserve your sanity you can measure the frequency response of the radio
and see what it is doing to the audio path.  Feed the audio into the sound
card and run a sound card spectrum analysis program.  There are many, such
as Sectragram.  There are several listed here:
http://www.radio.imradioha.org/pc_based_test_gear.htm

To do this just tune to a part of the band with pure noise (which is most
of the band).  The response you get then just shows what the filter is
letting through.

There is an example spectrum in the FoxTelem manual on page 13.  This is
marginal. Ideally it extends closer to zero Hz.
http://amsat.us/FoxTelem/foxtelem_manual.pdf

73
Chris

On Wed, Oct 10, 2018 at 11:42 AM Kevin Zari <kk4yel at gmail.com> wrote:

> Frank, I have read through the manual and it doesn’t appear the IC-910 has
> a button to long press to put it in digital mode. Also, I learned that the
> 9600 mode is only a toggle for the TX. On RX, it doesn’t change the signal
> getting on pin 4 or not. The audio is always on pin 4.
> -Kevin
>
>
> -----
>
> The problem with the world is that the intelligent people are full of
> doubts, while the stupid ones are full of confidence.
>
> > On Oct 10, 2018, at 11:06, Frank <K6FW1 at verizon.net> wrote:
> >
> > I  have a IC-9100.  In addition to setting the menu item to 9600 baud,
> the radio has to be in FM digital.  To put the IC-9100 into FM digital the
> FM mode button is de[pressed until the “D” icon shows on the display.  This
> disables the filtering to allow the DUV audio from the satellite to pass
> onto the sound card.  I don’t have an IC-910 so don’t know if this applies
> to that radio.
> >
> > I am using the IC-9100 into a computer sound card and Foxtelem and
> decoding the data and uploading to the server.
> >
> > Frank
> > K6FW
> >
> >
> >
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-- 
Chris E. Thompson
chrisethompson at gmail.com
g0kla at arrl.net