[amsat-bb] Unsuccessful Uplinks - AO-92

[Gabriel Zeifman]

This is incorrect. This would be true for V/u but is reverse for U/v as
Doppler is making the apparent received frequency at the satellite higher
as the satellite is flying towards the ground based transmitter.

73,
Gabe
AL6D/VE6NJH

On Wed, Jun 6, 2018, 8:14 PM Daniel Wight <kd7lee at gmail.com> wrote:

> Seems like your Doppler shift might be opposite. I normally start high &
> work my way down during the satellite pass... (For instance, I would start
> at 435.180 for AO-85 and then work my way down to 435.160 as the satellite
> 'sunsets' on my horizon). Doppler shift should be higher frequency during
> approach, near zero when the satellite is overhead, and lower after the
> satellite passes.
>
> 73,
>
> Daniel, KD7LEE
>
> On Wed, Jun 6, 2018, 17:27 Andrew Glasbrenner <glasbrenner at mindspring.com>
> wrote:
>
> > You've discovered one of the reasons full duplex is best on the FM
> > sats...you have no idea if you are getting through, because you can't
> hear
> > while transmitting.
> >
> > Got another radio so you can work full duplex?
> >
> > 73, Drew KO4MA
> >
> > -----Original Message-----
> > From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Hugo Dominguez,
> > Jr.
> > Sent: Wednesday, June 06, 2018 7:41 PM
> > To: amsat-bb at amsat.org
> > Subject: [amsat-bb] Unsuccessful Uplinks - AO-92
> >
> > I’ve just started playing with talking on satellites. I’m able to hear
> all
> > the satellites (AO-85, AO-91, AO-92 and SO-50) that I have programmed on
> my
> > Kenwood TH-D74, which I use with my Elk dual band periodic log antenna.
> > However no one can hear me or responds to me. I’ve only been successful
> > with my uplink (being heard) on AO-91 on several passes. I triple checked
> > my frequencies on my radio and the 67 Hz tone and they are set as
> follows:
> > Sat.        Xmit       Tone
> > SO-50   145.850  67.0 Hz
> > AO-85   435.170  67.0 Hz
> > AO-91   435.250  67.0 HZ
> > AO-92   435.350  67.0 Hz
> > These are the frequencies used when the bird is at its peak. I adjust for
> > doppler on 440 by starting out 10 khz less, e.g AO-85 435.160, 435.165,
> > 435.170, 435.175, 435.180.
> >
> > Any ideas if something has changed from what is published or am I missing
> > something? Like I said, i’ve been able to communicate on AO-91.
> >
> > —
> > Hugo Dominguez, Jr.
> > _______________________________________________
> > Sent via AMSAT-BB at 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.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> >
> > _______________________________________________
> > Sent via AMSAT-BB at 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.
> > Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> > Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB at 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.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>