Here is short notice for those you lucky enough to be near your radio. The
next ISS pass over the USA will be a school contact so tune in on 145.800.
Cedarview Middle School, Ottawa, ON, Canada, direct via VE3TBD
Contact is a go for Thu 2009-09-24 19:07:56 UTC 51 deg
My Nova screen shows the flight path as going from Baja California to
Newfoundland so this is a nice mid-continent pass!
73 de JoAnne K9JKM
Editor, AMSAT News Service
Copy Editor, AMSAT Journal
> Just heard a CW beacon on 437.385 with Doppler. It was 56-57. I was
> looking for the cubesats just launched by PSLV. As per the estimated
> TLEs, those Sats were within my AOS at 08.03 Z with 10 degree (W)
> elevation . Any confirmation on this ?
I also heard something like this, pretty weak and fairly brief, from CM88
at the same (uncorrected) frequency. If i had not seen the previous report,
i would not have posted anything. I was not able to hear SumbandilaSat, but
i can't say that's at all conclusive.
After being off the air for about a month, I recently made some changes to
the satellite setup. I upgraded from the TH-D7A(G) HT to the TM-D710A
mobile dual bander. Yes, a bit bulkier, but worth its weight. Anyhow, I
know many sat operators use the Arrow antenna setup, like what I've been
using the past 7 or so months with great results. However, I've always
known that the diplexer that comes with the unit is reather lossy. From
some reports I've read as much as 2.65dB of loss. That's almost half of
whats being received or transmitted being thrown away. When I layed out the
new portable setup I made it an issue to "lose" the diplexer and put one in
line that would perform better. I purchased the Comet CF-416. It's loss is
about .26dB. A considerably less amount by far and if needed in other
applications it can handle more power than the 10 watts alotted for the
Arrow's diplexer. I also bought some good quality RG-58 coax, only 6 feet
in length, for both 145 and 440, so there isn't much loss from this. About
.6dB according to the data sheet.
After the assembly and installation was complete, on air usage was next.
AO-27 had a fairly decent pass to the east of the QTH with a max elevation
of 24 degrees. I've remembered how the passes sounded previously at this
elevation so I could get a mental comparison. As the bird's timer turned
the digital transmission on I noticed one thing immediately, the signal was
clearer and no hiss. The analog timer swtiched on and the voices became
copiable. The signal appeared to be a bit stronger than the old setup with
the Arrow antenna but the most remarkable improvement was from the time I
started to receive the signal to near LOS, it never once dropped out! It
almost appeared as though I changed my linear antenna to a CP with a preamp.
I figured this is too good to be true. I then decided to test it with AO-51
and see how well that bodes. I noticed I was copying the signal closer to
the horizon than the previous set up and again the same results with no drop
outs, except for the one time the house blocked the signal for about 20
So if anybody is considering improving their current Arrow antenna, please
do so by getting a better diplexer. They are not expensive, $40 to $60, and
of course some decent coax, short runs are better but give yourself enough
slack so you don't cut yourself short!
See you on the birds!
Las Vegas, NV
I like to share with you some news about my succesfull experiments with my tinny transponder. I managed it to work with 23cm as input frequency :)
The changes are minor, just a few components to be changed and the input filter needs to be changed. I have to do some more testing but all looks very well for having an mode-LU linear transponder.
I just heared about another launch with several "beep"-sats on it.
When checking the Satellite Status List on the AMSAT-NA website, you need to search very well to find any satellite which has an uplink frequency. As active AMSAT operator I already deleted most of the kepler lines in the kepler list, as these are all "beep" sats which I can not use.
Lucky thing is that I not have much time to be active on satellites, but every once in a while when I check the satellite list my face gets more and more :(
In the past we had a few satellites, but they were very usefull (to AMSAT hams)...
Now we have many satellites, but only few are usefull (to AMSAT hams)...
Now up to my next project... a credit-card size Mode-B FM transponder :o)
73 de William, PE1RAH