Hi Alexandros,
the range of values is correct.
550kHz bandwidth requires at least 550kHz sampling rate for the Pluto. With 16 bits each for the I and the Q signal, this results in 17.6Mbit/s without any overhead.
In full-duplex operation, this is twice as much...
73 Roland
Here is the data sheet (click on PROCEED):
https://www.qorvo.com/products/d/da001999
The output power is probably about 0.5 .. 1 Watt if you prefer to be in the linear range.
Daniel, EA4GPZ, has reported that he received the beacon on May 16, 2019.
Ah - I wish people would post this a week before the event and not just before. First time the sun has been out in a month and I am too late. Tomorrow is work again....
Here is the requested reminder 
By the way, there is an excellent online calculator for this purpose.
https://www.satellite-calculat…llite/suninterference.php
After selecting the satellite (25.81° E) you can enter the downlink frequency and the used dish size.
For the location there is a map with search function.
73 Roland
Self-adhesive copper or aluminum tape is even slightly better.
Hi, Peter,
I had already written it. A constant beacon level is extremely helpful, not only for the alignment of (portable) RX antennas. With a few GNURadio blocks you can easily measure >real< SNR values, wich quickly helps to improve all components of the receive chain.
Please keep at least the lower CW-beacon stable, if you really want to realize these gimmicks.
73 Roland
[Blockierte Grafik: https://www.freetv.ie/images/d…abit-ethernet-adapter.jpg]
Hi, Trevor, after I have seen the picture of the adapter, I think that you will have no luck with this model.
I experienced the same problem half a year ago:
"On the PC side I use an "ASIX AX88179 USB 3.0 to Gigabit Ethernet Adapter". However, this type does not work reliably on my Pluto-USB-OTG, although it is classified as compatible by AD. But an "ASIX AX88772 USB2.0 to Fast Ethernet Adapter" does it without problems on the Pluto side."
73 + 55
Roland
DJ7TH Hi Rolf,
I guess that the strong signal near 2708 MHz is just an artifact resp. alias, similar to the birdies on an analogue receiver.
It also disappears, for example, if you set the SA to a center frequency of 2408 MHz.
Reducing then the span step by step from 61 down to 33 Mhz, again, our spurious signal moves from right to left through the spectrum.
At 32 MHz span it has reached 2407.8 Mhz once more, at 31 MHz span it disappears miraculously...
But it gets more interesting.
At 2408 MHz I have permanently a smaller signal with about 10...15 dB above the noise floor,
independent of span and center frequency.
However, this signal also disappears completely if a span of 3 MHz or less is set.
73 de Roland
DJ7TH Hi Rolf,
you're right, I can confirm the strange behaviour of the Spectrum Analyzer in combination with the Generator. I hadn't noticed this before, because I usually use the Spectrum Analyzer w/Tracking. The reason seems to be the automatic Rx gain control. If you set the Rx Gain mode to manual, you get rather comprehensible results.
For the first screenshots Tx and Rx were connected, for the second, the cable was removed.
73 de Roland
Could you please repeat the test with 50 Ohm termination on both Rx and Tx connectors?
73 de Roland
Last year there was already a discussion regarding the CW beacon:
Yes, it is really helpful that after the conversion to FSK a quasi-constant signal level is available.
This made e.g. the alignment and optimization of a receiving antenna much easier.
A second receiving channel a few kHz below the (or above the upper) beacon (requires only a few GNU radio blocks) even allows real SNR measurements.
The proposed level stepping would unfortunately cancel out these advantages.
On the other hand, for the combination of an ancient transceiver and a converter, the proposal could certainly be useful.
So, as a compromise, please keep the lower CW-beacon unchanged and extend the upper one with the level stepping, if really necessary.
73 de Roland
Hi Ray
Sorry, your question is quite valid.
To avoid ground loops it is obviously better if the transformer is not grounded on the primary side.
I just needed a mechanical strain relief for my quick-and-dirty setup.
The Coilcraft transformer you have found seems to be a good choice.
73 Roland
Please enter simply
0, 26
for location. Then it works.
" The second way is to use a latitude/longitude pair as two real numbers
separated by a comma. A positive number for latitude means north, and
a negative value means south. For longitude, negative means west, and
positive means east. Using this approach, you would enter41.714775, -72.727260 for ARRL headquarters, and the London
example is 51.50471, -0.26781. "
The problem is most likely caused by common mode transients. So it's best, as on7kec already mentioned, to have ferrite cores on the cables to/from Pluto.
This applies not only to USB, but also to Rx, Tx and if existing the external clock input.
And if that does not help yet, you have to think about RF-transformers with galvanic isolation.
Good luck,
Roland
Jetzt verstehe ich, du meinst eigentlich den Footprint...
Hier noch ein Beispiel mir sichtbarer Bodenspur.
Die vom QO-100 wäre bei diesem Maßstab ja nur ein einzelner Pixel.
Guten Morgen,
jetzt muss ich aber Heavens Above verteidigen.
Vermutlich wird der Blick auf QO-100 und die Erde im Parallelprojektion gezeigt und nicht der Blick von QO-100 zur Erde. Also nix mit Überreichweiten
Aber zurück zum Ausgangspunkt. Vielleicht funktioniert ja sogar "Starlink-Scatter" ?!
Optisch sind die ja nicht viel dunkler als die ISS.
Dankeschön, kannte ich noch nicht.
Und damit dieser Thread nicht "off topic" bleibt :
https://www.heavens-above.com/
Starlink, ISS, OSCAR und viele andere...
