Posts by DL3DCW

Auf den ersten Blick sehen die CAT-Kommandos von FT-817 und FT-897 identisch aus. Ich würde es einfach mal probieren. Kleinere Anpassungen kann man ja ggf. noch vornehmen. Ich selbst habe leider keinen FT-897 zum testen.

Mit der SDR-Console habe ich das selbst bisher nicht getestet.

Many thanks for your response. I use the case below with passive cooling (no fan). It runs 24/7 without problems:

https://flirc.tv/more/raspberry-pi-4-case

Small hint: The default setting for the master frequency is now 10706 MHz (engineering beacon of Es'hail-2). Since this signal has the opposite polarization, it is not very strong. But it works well. The beacon is the left peak in the receiving spectrum (see screenshot below):

As addition to the publication in the current "AMSAT-DL Journal" i have prepared the image for Raspberry Pi 4:

Download: http://www.satcontrol.de/images

Quote from DB2OS

... ich glaube vielen Anwendern des Duoband-Feed ist nicht klar, dass man für einen Offsetspiegel diese Linse haben muss...

Leider steht das in der Artikelbeschreibung für das Feed mit LNB (https://www.bamatech.net/anten…-feed-2-4-10-ghz-lnb.html) nicht drin. Dort steht "für rotationssymmetrische und Offset-Spiegel" ohne irgendeinen Hinweis das man bei Verwendung eines Offset-Spiegels eine zusätzliche Linse benötigt.

Auch im zugehörigen Onlineshop habe ich einen solchen Artikel (Linse/Konzentrator) bisher noch nicht gefunden.

After some improvements of my setup now it works fine. I have also added two ferrite clips on the ETH/USB-OTG adapter (see here). Maybe this was the solution.

I use this ETH/USB-OTG adapter: https://www.amazon.com/gp/product/B00RM3KXAU (with two ferrite clips over the short cable) and a separate 5V power supply. Without ferrite clips i have had similar problems (sometimes no ethernet connection).

Due to the low feedback (probably many OMs do not use a Raspberry Pi), I only improved my own system and have not released any new image. Maybe sometime - if there is demand - I will prepare and publish an actual image. BTW: I love my little Raspberry station

Best for this is to receive an unmodulated signal like the lower beacon. Then you can hear if your LNB is wobbling.

Do you receive the beacon signal „crystal clear“ without any wobbling effect?

An additional question from me (sorry for a little bit off topic): Are all Bamatech feeds with build in (selected) LNB absolute wobbling free? Maybe i am the only one with less luck ...

For info: Bamatech offers two different feeds: One classic duoband feed (only antennas) and one with build in LNB:

https://www.bamatech.net/anten…hail-2-P4-A--antenna.html

https://www.bamatech.net/anten…-feed-2-4-10-ghz-lnb.html

Maybe an additional lens for use with offset dishes is required on both types.

Yes, i take only a short test because first the (minimal) wobbling effect disturbes me more than a few dB signal loss ...

So until today i use two 85cm offset dishes for seperate RX and TX (and a third 1,9m mesh dish for ATV-TX).

I have such selected Bamatech LNB here. It is wobbling. The wobbling effect is not very strong but it is disturbing (for me). It is usable, but all received signals are slightly hummed.

I did not notice significant poor reception during my (very short) test with this feed (85cm offset dish Kathrein KEA 850).

BTW: TX performance of the Bamatech feed was a litte bit better than my Winkler Helix.

Quote from OE3APM

Welchen Preamp, PA und Fingerfilter verwendest Du bei Deinem Setup

Preamp: https://ibj-shop.com/40-dB-Breitband-LNA-1-3000MHz

PA: https://rf-market.fr/qo-100-sa…hz-qo-100-20w-pe1cmo.html

Filter: http://www.id-elektronik.de/produkte/filter/index.htm

Ist aber so noch nicht mein endgültiges Setup. TX-Leistung ist etwa 3-5W. An meinem 1,9m Spiegel gehen 333ks damit sehr gut, 500ks sind auch möglich aber manchmal etwas grenzwertig.

Hi Matthias,

das sieht da aber nur so aus wenn gerade nicht gebastelt/umgebaut wird, hi.

Frank

Bei mir sieht es so aus: Software vMix/OBS -> ADALM Pluto (via LAN/WLAN) -> Preamp -> PA -> Fingerfilter -> Helix Feed -> Gitterspiegel (1.9m)

Der Pluto hat die Custom-Firmware von F5EOE. Damit entfällt die DATV-Express Transmitter-Software da man direkt aus vMix/OBS senden kann. Ich habe den Pluto via LAN/WLAN angebunden und den gesamten Aufbau in der Nähe des TX-Spiegels montiert. Das minimiert die Kabelverluste und im Shack ist es auch etwas aufgeräumter.

Als RX benutze ich den MiniTiouner Express welcher direkt an einem separaten 85cm Offsetspiegel angeschlossen ist (also ohne Konverter/Empfangsmischer). Dort ist auch der NB-Teil angeschlossen. Das verwendete LNB verfügt über einen eingebauten TCXO.

It looks like the Toroid is in the wire of USB/LAN adapter. The wire of all my USB/LAN adapters is very short (max. 5-10cm). So i have to use an extension cable/adapter ...

My Pluto crashes only at DATV TX start (exactly in this moment). In all other cases it works fine. So maybe this is a software/firmware problem?

Hello,

my ADALM Pluto is connected via LAN/WLAN to my shack and directly accessible from vMix/OBS via RTMP stream (F5EOE custom firmware, see here). Usually that works very well.

But sometimes a few seconds after starting RTMP stream the Pluto crashes. Exactly in the moment when the Pluto begins to TX (6-8 seconds after starting RTMP stream). The TX signal seems to be ok (MiniTioune locks and all indicators are green) but there is no valid video/audio. When I stop the RTMP stream the Pluto don’t stop transmitting (because he is crashed?). So I have to switch off the pa and reboot the Pluto.

Mostly the Pluto works well and the TX signal is ok over hours. For switch on/off the transmitter i use the PTT input of my PA. So I don’t have to interrupt the RTMP stream. But if I stop the stream (to change settings e.g.) and restart it then the Pluto sometimes crashes again.

What I have done:

- GND-Modification of Pluto (bridge at L7)

- Improved GND concept of my whole setup

- Different USB/LAN adapters tested

With no success until now. Whitout active PA the same happens. So maybe no rf problem. I also have tested to transmit via “DATV Express Transmitter” software. This software also crashes sometimes or give an error message (Pluto not found). Maybe because that the Pluto is crashed again ...

Has anyone made similar observations?

Frank, DL3DCW