AMSAT OSCAR-7 (1974)

IZ5ILX · Nov 15th 2019

Good evening to all, today as many SATELLITE enthusiasts know, the DEAR <OSCAR -7> <AO7>, celebrates its "45 YEARS IN SPACE",

(11/15/1974)

For this occasion I will send via <QO-100> a commemorative image in the <KG - STV> mode, the transmission frequency will be the one assigned to this activity <10489.625.00 Ghz>

I hope to do something pleasing, ESPECIALLY those who, like me, still have the chance to make excellent QSOs thanks to this MAGNIFICENT and SURPRISING SATELLITE !!

LONG LIFE OLD BIRD !! <OSCAR - 7>

73 TO ALL

IZ5ILX <jn54ac >

DD0KP · Nov 16th 2019

Very nice Vale..many thanks..

IZ5ILX · Nov 16th 2019

GM " HEINER " Tnx for ur NICE REPORT .... as USUAL !!!

73 ..HAVE NICE DAY !!

CIAO Vale

IZ5ILX · Nov 16th 2019

This is an example of the potential that this PERFORMANT Satellite <OSCAR - 7> still offers

73 Vale

IZ5ILX

IZ5ILX · Nov 16th 2019

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One of many qso with " K3SZH Josef " .....

Too bad that many people do not like SATELLITES, with ORBIT "LEO" ......

Perhaps because there is something to COMPLICATE oneself with life ...

but this is the BEAUTIFUL one ...

Of course this is just my thought ..

73 Vale

PA3AOD · Nov 16th 2019

IZ5ILX Will there be another transmission, Just installed KG-STV

Bert PA3AOD

IZ5ILX · Nov 16th 2019

PA3AOD

Hi Bert ,

Now i'am on 625 ..

PA3AOD · Nov 16th 2019

What mode ( MSK - 4L-FSK and Code

Totally new at digital SSTV

PA3AOD · Nov 16th 2019

i see only a big peak at 625

IZ5ILX · Nov 16th 2019

PA3AOD

HI Bert,

sorry I had to leave,

when I went on the frequency, it was already busy, so I did tests at 630, however the SW, <KG-STV> as far as reception is concerned, does everything by itself, just tune in perfectly to the transmission frequency, you can help the software itself, indicating on the waterfall two dashed lines, the signal must absolutely be inside them.

One thing IMPORTANT, for the success of the decoding is absolutely the STABILITY, perhaps more than receiving a strong signal, you will see that a small shift in the reception is enough to immediately generate errors (BSR) <Bad Segment Report>

For now, good reception, on the web you will find a lot of information about it, or there is also a tutorial on youtube, made by: <HEINER DD0KP> a few days ago during the SYMPOSIUM AMSAT-DL

(QO-100 DIGITAL MODE)

SOON, via <KG-STV>

73 Vale

PA3AOD · Nov 16th 2019

Yes Vale seen a couple of youtube films about KG-STV.

Will leave my RX on 10.489.625 for a couple of days and see if something happens at my screen.

Made hundreds of SSTV QSO's but only in analog so now switching to digital and satellite, exciting

Thanks,

Bert PA3AOD

IZ5ILX · Nov 16th 2019

PA3AOD

Ok Bert

I'm sure you will have excellent results, see you soon and good tests !!

73 Vale

PA3AOD · Nov 17th 2019

The first pictures received with KG-STV today, so the receive part works.

The bandpass must exactly between the two dotted lines that's a little bit tricky for automatic receiving without my interference.

73,

Bert

IZ5ILX · Nov 17th 2019

HI Bert,

Very well, I knew you'd succeeded without much trouble,

as for the TX part, as I said, it is very important that the TXing , but also the RXing , is perfectly aligned, we say that STABILITY IS FUNDAMENTAL.

It happened to me to receive transmissions with a relatively low signal, but with PERFECT STABILITY, and the result was perfect.

When you are ready to transmit, we will try with great pleasure.

CIAO

73 Vale

DL4EEC · Mar 9th 2020

Hi

The low activity on AO-7 is sooo sad. I did some DX QSO´s the last weeks and this bird is really great.

Today Oscar 7 was active in Mode A (10m downlink) and very loud – but nobody was on L

DL4EEC · Apr 19th 2020

Hi

I really like the Mode A. Please don’t get me wrong, but I´ll highlight some important facts.

Listen to the downlink. I’m receiving very strong downlink signals, but I´m not sure that these stations could recognize their own signal. They are shifting very much and searching their own signal. In addition the are not receiving other answering stations. Sometimes I increase my uplink power to be stronger than their downlink, Even than, they are not able to copy everything.

Please check your receiver/antenna. AO-7 is very sensitive and has a very limited power budget. Therefore be very careful with high uplink power.
Mode A is not inverting >> the 2m Uplink and the 10m downlink are both in USB.

Let’s enjoy that very old bird.

Best regards

Alex

HB9SKA · Apr 19th 2020

I use a RCI-2950DX TRX as RX and an L/2 inverted-V dipol for AO-7_A. Yesterday I had also a strong signal.

oh2aue · Apr 19th 2020

Just in case somebody does not have immediate access to old articles and magazines, here is my writeup on AO-7 from, like, >20 years ago. I realize some of the links are now obsolete and need to overhaul this page sometime soonish. For me, the most important are the block diagrams of the transponder, especially the HELAPS transponder.

Things to do list: write an English Block Diagram...

I also really need to take some time to write something on the 2.3 GHz S band beacon that never got tested in orbit. But regardless, many thanks to the San Bernardino Microwave Society for supplying the flight hardware, eons ago.

https://73.fi/oh2aue/ao_07_history.htm

or

https://www.qsl.net/oh2aue/ao_07_history.htm

/michael, oh2aue

HB9SKA · Apr 20th 2020

Quote from oh2aue

https://73.fi/oh2aue/ao_07_history.htm

Your connection is not secure

The owner of 73.fi has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

URL @ AMSAT-NA:

https://www.amsat.org/two-way-satellites/ao-7/

Apropos OSCARlator: I began my "OSCAR career" with a self written BASIC program on an Apple-II. Later I ported it to an IBM-PC and again to a BASIC dialect for OS/2 with many upgrades.

73, stay save and healthy, Thomas

oh2aue · Apr 20th 2020

Quote from HB9SKA

Your connection is not secure

The owner of 73.fi has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

Thomas,

the site is about as secure as possible (I am sure you did use https).

Please run:https://www.ssllabs.com/ssltest/analyze.html?d=73.fi&latest

Results:

73.fi Overall Rating: A+

Your web browser must support SNI and use TLA 1.2 or TLS 1.3

Firefox version 31 will not work, but then the current version is 75...

Take care,

/michael, oh2aue

AMSAT OSCAR-7 (1974)

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