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.
Roger WA1KAT
----- Original Message ----- From: "Kelly Martin" kelly.lynn.martin@gmail.com To: "Ken Owen" n6kth@n6kth.com Cc: amsat-bb@amsat.org; paul_je@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.
Kelly
On Mon, Nov 24, 2008 at 5:20 PM, Ken Owen n6kth@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,
and
the other has to do with antenna polarization. I've urged him to join
AMSAT
and get on the listserv, but in the mean time, I wonder if anyone can
help
him out with his questions.
Please reply directly to him (paul_je@hotmail.com) if you can help.
Thanks!
Ken, N6KTH
From: Paul Je [mailto:paul_je@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
if
I could ask for your advice. Well, you see, we've tested the
transceiver
that we have (the ICOM IC-V8000), and we can transmit and receive just
fine
with it on our circular-polarized HyGain 2m antenna. Also, we did a
VSWR
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
ISS
produces.
My classmates and I are a bit worried/stressed out. I mean, just on
last
Friday, we did a test and someone drove at least 5km away from out
college
and heard us fine with the handheld radio he had. We had a signal
strength
of 3+ out of 5. He could've drove out even further, but we felt that we
did
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
a
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
Yaesu
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
ISS
right hand or left hand on 144.490MHz?
I'm trying to research this, but I'm having the hardest time to find
this
information out. Oh, also, since our antenna is circular-polarized,
does
the way we set our antenna have an effect on our transmission? I know
this
sounds confusing, but let me explain:
If you looked at our antenna from the front so that you could see all
the
dipoles/elements both vertically and horizontally to your view, well,
should
they be perfectly aligned with one set horizontal and one vertical?
Both
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
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb