[amsat-bb] Re: Help for Humber College Students with ISS Contact
rogerkola at aol.com
Mon Nov 24 21:41:28 PST 2008
I never realized there was a 166 mHz downlink on the ISS...I always look for
it on the 143 and 145 mHz frequencies and can hear it with my 1980's vintage
Regency scanner with it's original inside antenna.
----- Original Message -----
From: "Kelly Martin" <kelly.lynn.martin at gmail.com>
To: "Ken Owen" <n6kth at n6kth.com>
Cc: <amsat-bb at amsat.org>; <paul_je at hotmail.com>
Sent: Monday, November 24, 2008 7:03 PM
Subject: [amsat-bb] Re: Help for Humber College Students with ISS Contact
> These are the people whose professor famously told the Toronto Star
> said that only professional radio engineers had the knowledge and
> competency to contact the ISS. I wrote the professor a letter, but he
> never replied.
> I suspect their main problem is that they're using an excessively
> high-gain antenna, which means it's extremely directional and thus the
> targeting has to be very precise.
> Also, it might help if they listened on the DOWNLINK frequency instead
> of the UPLINK frequency.
> On Mon, Nov 24, 2008 at 5:20 PM, Ken Owen <n6kth at n6kth.com> wrote:
> > Hi folks:
> > A student from Humber College (Toronto) has asked me several questions
> > regarding contacting the ISS. One has to do with receiving a beacon,
> > the other has to do with antenna polarization. I've urged him to join
> > and get on the listserv, but in the mean time, I wonder if anyone can
> > him out with his questions.
> > Please reply directly to him (paul_je at hotmail.com) if you can help.
> > Thanks!
> > Ken, N6KTH
> > From: Paul Je [mailto:paul_je at hotmail.com]
> > Sent: Monday, November 24, 2008 1:17 PM
> > To: Ken Owen
> > Subject: RE: ISS contact
> > Say Ken, we've set up our primary station just fine, but I was wondering
> > I could ask for your advice. Well, you see, we've tested the
> > that we have (the ICOM IC-V8000), and we can transmit and receive just
> > with it on our circular-polarized HyGain 2m antenna. Also, we did a
> > test and our loss is minimal with the 75W transceiver that the ICOM
> > produces. Ok, so here's the problem. Even with all the proper testing
> > done, we still can't seem to pick up or hear the 166MHz beacon that the
> > produces.
> > My classmates and I are a bit worried/stressed out. I mean, just on
> > Friday, we did a test and someone drove at least 5km away from out
> > and heard us fine with the handheld radio he had. We had a signal
> > of 3+ out of 5. He could've drove out even further, but we felt that we
> > enough testing to know that any attenuation losses were very minimal.
> > Well, do you know what the problem could be? Have you heard the beacon?
> > What does it sound like? Maybe we should delay or advance the rotor by
> > few seconds? We're using NOVA software, and it allows us to send our
> > transmission a few seconds ahead or behind.
> > Ok, so we have a circular polarized HyGain antenna hooked up to our
> > G5500. Uhm, this might sound dumb but do you know whether we should be
> > right hand circular polarized or left hand circular polarized? Is the
> > right hand or left hand on 144.490MHz?
> > I'm trying to research this, but I'm having the hardest time to find
> > information out. Oh, also, since our antenna is circular-polarized,
> > the way we set our antenna have an effect on our transmission? I know
> > sounds confusing, but let me explain:
> > If you looked at our antenna from the front so that you could see all
> > dipoles/elements both vertically and horizontally to your view, well,
> > they be perfectly aligned with one set horizontal and one vertical?
> > the vertical and the horizontal are perfectly 90degrees to each other,
> > however, instead of being a perfect cross to your view, the elements are
> > more like an "X" to your point of view (even though both are perfectly
> > 90degrees to each other).
> > Well, hope to hear back from you.
> > Paul
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