Inmarsat Aero Changes

[cabbar]

Many thanks again Hutch.. I will try and see if I can decode the bursts

You can see the uplink messages with any L band antenna. When you look at the frequencies of 1646.5-1646.850mhz for GES C1 and GES C5 600 bps messages, and 1646.85-1647.70 for GES 90 10.500 bps messages, you can see the Acars signals with the appropriate antenna and decode them with Jaero, I am using tallysman HC 610. and I am very happy with its performance.


Cabbar

 

[VK3HSP]

Looking at the L-Band 8400 bps voice downlinks from 6-F1, it appears they are not consistently transmitting when calls take place. Usually during long periods of silence on the I4 sats (4-F2 and previously 4-F1 at least) the signal will keep transmitting but on 6-F1 when the ground side is not talking then the transmission will cease until they start speaking. Often times there will be short bursts of the voice signal but I'm not sure if there is any extra data contained within them.

 

[open-sky]

Sie können die Uplink-Nachrichten mit jeder L-Band-Antenne sehen. Wenn Sie sich die Frequenzen von 1646,5-1646,850 MHz für GES C1 und GES C5 600 bps Nachrichten und 1646,85-1647,70 für GES 90 10.500 bps Nachrichten ansehen, können Sie die Acars-Signale mit der entsprechenden Antenne sehen und mit Jaero dekodieren, ich verwende tallysman HC 610. und ich bin sehr zufrieden mit seiner Leistung.


Scheide

Sie können die Uplink-Nachrichten mit jeder L-Band-Antenne sehen. Wenn Sie sich die Frequenzen von 1646,5-1646,850 MHz für GES C1 und GES C5 600 bps Nachrichten und 1646,85-1647,70 für GES 90 10.500 bps Nachrichten ansehen, können Sie die Acars-Signale mit der entsprechenden Antenne sehen und mit Jaero dekodieren, ich verwende tallysman HC 610. und ich bin sehr zufrieden mit seiner Leistung.


Scheide

You can see the uplink messages with any L band antenna. When you look at the frequencies of 1646.5-1646.850mhz for GES C1 and GES C5 600 bps messages, and 1646.85-1647.70 for GES 90 10.500 bps messages, you can see the Acars signals with the appropriate antenna and decode them with Jaero, I am using tallysman HC 610. and I am very happy with its performance.


Cabbar

Hello Cabbar!
have a question? You can also use the hc 610 for Inmarsat reception 1545-1546 MHz
best regards

 

[cabbar]

Hello Cabbar!
have a question? You can also use the hc 610 for Inmarsat reception 1545-1546 MHz
best regards

Hello ,This antenna is made to operate in the iridium band, but You can still get good efficiency between 1600-1660 mhz. I am adding the link with the technical specifications of the antenna. I wish you a good day
73

https://www.tallysman.com/app/uploads/2020/12/Tallysman%C2%AE-HC610-Datasheet.pdf

 

[open-sky]

Hello
Maxtena M 1590HCT-LP-SM

https://maxtena.com

in your opinion, would this antenna be useful for Inmarsat and Iridium reception? ( with the sawbird from Nooelec ) I'm currently using the self-made helix from thebaldgeek, a top antenna!

with the best regards Gerhard

 

[thebaldgeek]

Hello
Maxtena M 1590HCT-LP-SM

https://maxtena.com

in your opinion, would this antenna be useful for Inmarsat and Iridium reception? ( with the sawbird from Nooelec ) I'm currently using the self-made helix from thebaldgeek, a top antenna!

with the best regards Gerhard

This antenna would be poor for Inmarsat and okish for Iridium.
Inmarsat as you know is a geo bird, so you need a good bit of forward or directional gain which you have with the 7 turn helix.
Iridium are LEO and so you don't need very much gain, just good broad wide, 360deg around, overall smooth gain.
Those two use cases can not co-exist in the one antenna.
When it comes to Iridium, that part of the L-Band is super busy with lot of GPS type signals and a good Iridium antenna will filter those out. This antenna does not appear to have much in the way of filtering, it seems to want to catch all those signals and let the user try and sort it out.
The best Iridium antenna (after testing over a dozen) is still the HC610 No need for an LNA as the filtered one in this antenna is very very good.

 

[open-sky]

Thank you for your informative message!
I currently have the problem of receiving signals of GES 90 (10500 bps max. 4db ) only very weakly, 600 + 1200 bps strong -18db.
I no longer receive signals from GES 44, C1, C5 at all! and now GES 90 is very limited. What could be the reason?

have a good day!
Gerhard

 

[open-sky]

Hello
Interesting website with L-Band Equipment !......(nolle.engineering)

regards Gerhard