[amsat-bb] Unsuccessful Uplinks - AO-92

[Daniel Wight]

As Gabe pointed out, I may have this backwards as I started out on SO-50
(V/U) & then applied my original techniques to the Fox (U/V) birds in error
(i.e. your initial settings are probably correct). I need to do some more
research before I understand this fully, but it looks like I've been using
the wrong uplink frequencies on my IC-W32A. My apologies for the mistake.
Looks like I'll be reprogramming my radio soon....

73,

Daniel, KD7LEE

On Wed, Jun 6, 2018, 21:50 Hugo Dominguez, Jr. <hugois at gmail.com> wrote:

> Thanks. All the web pages I read said to perform doppler shift by starting
> 10 kHz below and work your way up. Even this amsat website has instructions
> to do it how I am doing it:
> https://amsat-uk.org/2018/01/26/ao-92-open-for-amateur-radio-use/
>
> I also just noticed that there is a schedule for the L-band for uplink
> which i’m interpreting that UHF won’t work when the bird is setup for the
> L-band for uplink. Maybe I was trying to make contact when it was on the L
> band.
>
> —
> Hugo Dominguez, Jr.
>
> On Jun 6, 2018, at 21:07, 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.
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>> _______________________________________________
>> 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!
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>>
>