DTUsat-2, Horyu-4 status 2.4GHz
[DTUsat-2]
From: MICHAEL WILLIAMS
To: Mineo Wakita
Date: Sun, 29 Oct 2017 10:31:15 -0400 (EDT)
The last time I checked with my SDR, DTUSat-2 was sending no beacons,
partial beacons, and maybe one or two full beacons.
It was very intermittent.
Missing, partial, or full beacons. Unpredictable day to day.
On some days, no beacons. On other days, many beacons.
As winter comes, it will get sunlight sooner coming up from the south.
Maybe improvement then. I will monitor and report back.
http://dl.dropbox.com/s/y2r3ghfelvhgg2q/71030dt2.wmv 73, Mike
> On October 28, 2017 at 10:51 PM Mineo Wakita wrote:
>
> Hello Mike,
>
> I fixed the reception system of DTUsat-2 yesterday.
> Today, 2.4 GHz signal was not heard on a low elevation pass.
> Is DTUsat-2 2.4GHz still fine now?
>
> JE9PEL, Mineo Wakita
DTUsat-2 heard weak 2.4GHz
02:39-02:51 UTC, 23 Nov 2017, Ele 23 SW-W-WN, 2401.843MHz->145.843MHz
http://dl.dropbox.com/s/nvboxmudbvu2a0e/71123dt2.wav
I confirmed 2.4GHz signal from DTUsat-2 for the first time in a while since May.
During that time I was repairing both the broken amplifier and the converter.
It seems that there is no eclipse, so I heard a weak 2.4 GHz signal of DTUsat-2.
The converter seems to be converted to about 16 kHz higher than before, so
I will observe how much this difference is while repeating the experiment.
DTUsat-2 receiving 2.4GHz
01:39-01:52 UTC, 26 Nov 2017, Ele 64 SE-E-N, 2401.843MHz
2401.914MHz - 2401.898MHz = 16kHz : Difference in Converter
Re: DTUsat-2 heard weak 2.4GHz
From: MICHAEL WILLIAMS
To: Mineo Wakita
Date: Wed, 29 Nov 2017 22:42:14 -0500 (EST)
Mineo,
Attached is today's pass. I am also trying to determine frequency error
of converter, error of SDR, and error of my calibrator. Not an easy job.
In first attachment, SatPC-32 is running in the lower left corner.
SatPC-32 is controlling SDR. Red line is SATPC-32's computed Doppler
frequency. It looks like DTUsat-2 is coming in about 6 KHz lower than
SatPC-32 predicts using equipment here. I need to determine errors.
My down converter is at the antenna and converts 2401 to 145 MHz.
I found outside temperature changes the crystal oscillator's frequency
thus the converted frequency. The second attachment is my efforts for
predicting the Doppler.sqf. Normal steps was to check outside temperature,
use formula to calculate Doppler.sqf frequency, put calculated frequency
into Doppler.sqf file. This was successful with the FT-847. I was always
very close to DTUSat-2's signal at AOS. The graph's X axis is temp in F,
and Y axis is last two digits of frequency (2401.835 would be 35).
Is DTUSat-2 sending signals during eclipse?
If it is, I will start listening at night.
Good luck on your calculations.
73, Mike (K9QHO)
> On November 23, 2017 at 7:19 AM Mineo Wakita wrote:
>
> Hello Mike,
>
> I confirmed 2.4GHz signal from DTUsat-2 for the first time
> in a while since May. During that time I was repairing both
> the broken amplifier and the converter. It seems that there
> is no eclipse, so I heard a weak 2.4 GHz signal of DTUsat-2.
> The converter seems to be converted to about 16 kHz higher
> than before, so I will observe how much this difference is
> while repeating the experiment.
>
> 02:39-02:51 UTC, 23 Nov 2017, Ele 23 SW-W-WN, 2401.843MHz
> http://dl.dropbox.com/s/nvboxmudbvu2a0e/71123dt2.wav
> http://dl.dropbox.com/s/yo5b3qmgqncevf3/71123dt2.png
> http://www.ne.jp/asahi/hamradio/je9pel/dt2hory4.htm
>
> JE9PEL, Mineo Wakita
[Horyu-4]
From: Hiroshi Fukuda
To: Mineo Wakita
Date: Mon, 30 Oct 2017 00:00:33 +0000
The operational information is publicized at facebook.
Horyu-4 S-band decoder: Kyutech Site
Horyu-4 heard 2.4GHz by JE9PEL
14:56-15:08 UTC, 30 Oct 2017, Ele 42 WS-S-E, 2400.300MHz
2400.340MHz - 2400.324MHz = 16kHz : Difference in Converter
Horyu-4 carrier 2.4GHz
14:50-15:02 UTC, 2 Nov 2017, Ele 45 W-S-E, 2400.300MHz
This wav sound is the signal on the right side of the 100 kHz width signal.
It sounds like a carrier wave, but I do not know if the data are on it.
It seems that Horyu-4 is sending 2.4 GHz signal in midnight pass over Japan.
Horyu-4 strong 2.4GHz
02:27-02:39 UTC, 20 Jan 2018, Ele 22 W-N-NE, 2400.300MHz BPSK
[Complement]
SDR# Shift value by JA0CAW,JE9PEL
Satellite(A) SDR#Shift(B) A-B
(Example1) 2400,000,000 2,256,000,000 144,000,000
(Example2) 2401,000,000 2,256,000,000 145,000,000
(Example3) 2401,840,000 2,256,000,000 145,840,000
[Reference]
http://www.ne.jp/asahi/hamradio/je9pel/dtusat_3.htm
http://www.ne.jp/asahi/hamradio/je9pel/horyu4mi.htm
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