[amsat-bb] Ao 73 problems

Bob WB4SON at gmail.com
Sun Oct 25 15:37:48 UTC 2015

After working with AO-73 since its launch, I've noticed that the actual
uplink frequency is vastly different from the published value, and I'm not
the only person to have reported this.  I have asked the UK team multiple
times to verify the uplink/downlink ratio, but they have never published an
update.  The end result is that new users can't find themselves on AO-73.

Here is my Doppler.sqf file entry for AO-73. and comments that the required
correction is about 18 KHz higher than the published values.

“AO-73,145957.52,435160.48,CW,CW,REV,,, Transponder”

Note that the published figures says that 145.957.5 should be about
435.142.5, so my correction value is about 18 KHz higher than published

I would recommend that you try setting your uplink much higher and see if
you can find yourself.

73, Bob, WB4SON

On Sun, Oct 25, 2015 at 8:01 AM, Colin Hurst <cjhurst at bigpond.net.au> wrote:

> Kev,
> Looking at the last pass over VK, 145.950 is not within the pass-band.
> Try 145.960 which is more central to the pass-band.
> Not sure of uplink frequencies though.
> Colin VK5HI.
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of mm0kjg via
> Sent: Sunday, 25 October 2015 21:55
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Ao 73 problems
> Hello all.
> I seem to have a wee problem with working Ao-73. The problem I cant work it
> at all. I am hearing people talking but when I attempt to find my downlink
> nothing heard. I have tried sending cw up and tuning downlink and also
> tuning uplink and nothing.  I have set up tuning for 145.950 down and
> 435.150 up. Am missing something here?
> I spoke to my good friend and very good Sat operator Derrick Gm0fmw and he
> also cant access it with a fairly good antenna set-up. We are both in
> Edinburgh Scotland Is this the problem?
> Please all help will be appreciated .
> Thanks Kev MM0KJG
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