[amsat-bb] Unsuccessful Uplinks - AO-92

[k6vug at sbcglobal.net]

 I completely agree, but now I'm looking into replacing it with a HF+VHF+UHF Triplexer explicitly for the SDR Receiver.  

73!Umesh, K6VUG



    On Thursday, June 7, 2018, 7:02:17 AM PDT, Don KB2YSI <kb2ysi at gmail.com> wrote:  
 
 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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