[amsat-bb] Unsuccessful Uplinks - AO-92

[Don KB2YSI]

Full duplex without desensitization rules, I never knew how much until I
put a MFJ-916B into my setup.

I have a few pictures and a diagram on my hamqth.com/KB2YSI page if anyone
is interested.

73, Don KB2YSI

On Thu, Jun 7, 2018, 09:28 k6vug at sbcglobal.net <k6vug at sbcglobal.net> wrote:

>
> Drew KO4MA, is absolutely right, operating full duplex is the best way to
> work these satellites.
>
> Having said that, I was stumped once when I heard the AO-92 downlink "full
> quieting" for the entire pass but could not get into the uplink. Strangely
> enough, I heard only 2 stations calling and no one responding.
>
> It was pretty frustrating, making me doubt everything I had learned so
> far.  Then one day, I found out (right here on this BBS) that the satellite
> switches to L/V mode, then it all made sense. Now I always check the
> current status page at AMSAT.ORG especially when operating AO-92.
>
> I also learned about why it difficult to get into AO-85 with a HT.  Keep
> reading, you'll learn a lot here from the gurus... trust me :)
> Good luck on the next pass...
>
> 73!Umeshk6vug
>   ------------------------------
>
> Message: 12
> Date: Wed, 6 Jun 2018 20:25:49 -0400
> From: "Andrew Glasbrenner" <glasbrenner at mindspring.com>
> To: "'Hugo Dominguez, Jr.'" <hugois at gmail.com>,    <amsat-bb at amsat.org>
> Subject: Re: [amsat-bb] Unsuccessful Uplinks - AO-92
> Message-ID: <002c01d3fdf6$16120c20$42362460$@mindspring.com>
> Content-Type: text/plain;    charset="UTF-8"
>
> 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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