Hi all,

Interesting characterization of the new bird!  It's fun, helpful, and important. In the for what it's worth category: One small but important reminder---using TCA for measurements may be easiest from a "can hear it" perspective, but unless the TLEs are dead on--it's really hard to use that part of the pass.  Since HO-113 is a fairly new bird, I'd make sure any observations made at TCA also hold up at AOS or LOS...if they don't, the AOS or LOS observations are probably closer.  Just food for thought!

73,



Mark L. Hammond [N8MH]
AMSAT Director and Command Station



On Mon, Jan 10, 2022 at 10:16 AM John Brier <johnbrier@gmail.com> wrote:
Brian Grigsby, KE4IP made a recording of his waterfall:

https://www.youtube.com/watch?v=va-k91dFh4w

Looks like TCA/max elevation is at 01:43 in the video and the passband
looks like it's shifted about 9 KHz up from the published frequency.
On the bottom end I see a hard cut off at 435.174 and at the top end I
see a cut off starting at 435.204 gradually to 435.206.

So maybe the real center frequency of the transponder is 435.189. For
manual tuners it's probably easier to just say 435.190.

In my experience when I was using the satellite the uplink passband
seemed to be lined up perfectly with the downlink so I would guess the
uplink passband is shifted the same amount. I think that would make
the uplink passband center frequency 145.861 (for manual tuners easier
to say 145.860).

Thoughts?

73, John Brier KG4AKV

On Sun, Jan 9, 2022 at 9:09 AM John Brier <johnbrier@gmail.com> wrote:
>
> Thank you Juan.
>
> I hope other people with SDR radios and fixed stations with Az/El
> rotators will characterize the real center of the passband so we can
> give people the right info about this satellite. I would hate someone
> to try and work a part of the passband that didn't exist, and get
> frustrated.
>
> 73, John Brier KG4AKV
>
> On Sun, Jan 9, 2022 at 9:00 AM LU2DPW Juan Carlos <lu2dpw@yahoo.com.ar> wrote:
> >
> > Hi John and all
> >
> > Indeed, I have been able to verify that the upper edge
> >  of the passband is higher than the one reported.
> >
> > In the AOS at about 8º I have been able to hear my return
> >  in 435212 khz with a uplink in 145844 khz.
> >
> > 73 de Juan LU2DPW GF05gi
> >
> >
> >
> > El domingo, 9 de enero de 2022 00:53:58 ART, John Brier <johnbrier@gmail.com> escribió:
> >
> >
> > I did a little test tonight and I think the edge of the top of the
> > passband is around 10KHz higher than published. Don't have time to do
> > the math on the bottom of the passband.
> >
> > Is my math right?
> >
> > https://www.youtube.com/watch?v=xSauk0Th-Yw
> >
> > I could have just zoomed out on the waterfall... oh well.
> >
> > 73, John Brier KG4AKV
> >
> > -----------------------------------------------------------
> >
> > Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership. Opinions expressed
> > are solely those of the author, and do not reflect the official views of AMSAT-NA.
> > Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
> >
> > View archives of this mailing list at
> > https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org
> > To unsubscribe send an email to amsat-bb-leave(a)amsat.org
> > Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

-----------------------------------------------------------

Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/

View archives of this mailing list at
https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org
To unsubscribe send an email to amsat-bb-leave(a)amsat.org
Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org