70W C-Band

[moonbase]

From your personal experience did you find that the 'entire internal length' was better or just 'the first couple of inches' ... asking for a friend

Full length seems to be the best option, length for strength, girth for mirth.

 

[John]

Full length seems to be the best option, length for strength, girth for mirth.

Agreed totally - just finished the feed mod, will test asap.

 

[Channel Hopper]

That certainly is a good experiment suggestion to try and has set my curiousity buds flowing - i think i've got a bit of ~41mm pipe somewhere which will slot into my exising feed throat as a sleeve. Some analyser grabs of full band frequency plots before and after the sleeve has been fitted could be interesting, especially what effect it will have on the 4.5 to 4.8GHz section of my reception as well as attenuation of the bad 5G around 3.680 and lower .

4.8GHz may be enhanced since the 229 flange has a cut off of just over 5.1GHz (designed in part to prevent cross polarised signals from an outgoing uplink interfering with the received signals).

A slimmer feed (41mm as the example) should allow better reception at 4.8GHz as it is close to the envelope centre since the upper cutoff would now be just on 7GHz.

Caveat, you might now get interference from other signals from space (including natural molecule oscillations )but these can be analysed.

Btw Sirius XM used a 7.05 GHz signal as its uplink owing to favourable atmospheric conditions (with telemetry around 6.42 GHz)

 

[John]

Ok, starting off then - three grabs, Original 60mm I/D feed throat / 41mm I/D throat sleeve / 56.3mm I/D throat sleeve, sleeve's made from available scrap box metals. The experiment with 41mm I/D sleeve works but in the wrong frequency range. Anything below 4.5Ghz is dramaticaly reduced to the point of signal loss from 3.6 to 4.5GHz - signal very slightly degraded from 4.5 to 4.8GHz but getting through.
I'm pretty sure that the 56.3mm I/D sleeve marginally reduced the 5G signals without noticeably degrading 3.6 to 4.8GHz signal levels.
It would be interesting to try a 55mm I/D sleeve at some point but would have to buy in the material.
Looking at the feed entry pic, it shows how the sleeve will slide in and butt up to the Circular poloriser front input face - the Norsat 8000RI 3.6 to 4.8GHz is at RHC reception.
It passed away a few interesting hours to satisfy the curiousity i suppose but 5G interference, depending how close to the source you are is always going to be a tough one to eliminate successfully , if at all.
It might be interesting for people using an lnbf to experiment with inserting various sleeve pieces - you never know.
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[Channel Hopper]

Ok, starting off then - three grabs, Original 60mm I/D feed throat / 41mm I/D throat sleeve / 56.3mm I/D throat sleeve, sleeve's made from available scrap box metals. The experiment with 41mm I/D sleeve works but in the wrong frequency range. Anything below 4.5Ghz is dramaticaly reduced to the point of signal loss from 3.6 to 4.5GHz - signal very slightly degraded from 4.5 to 4.8GHz but getting through.
I'm pretty sure that the 56.3mm I/D sleeve marginally reduced the 5G signals without noticeably degrading 3.6 to 4.8GHz signal levels.
It would be interesting to try a 55mm I/D sleeve at some point but would have to buy in the material.
Looking at the feed entry pic, it shows how the sleeve will slide in and butt up to the Circular poloriser front input face - the Norsat 8000RI 3.6 to 4.8GHz is at RHC reception.
It passed away a few interesting hours to satisfy the curiousity i suppose but 5G interference, depending how close to the source you are is always going to be a tough one to eliminate successfully , if at all.
It might be interesting for people using an lnbf to experiment with inserting various sleeve pieces - you never know.
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

View attachment 151239View attachment 151240

Well, I didn't suggest sticking it in front of a professional depolarisor cast around lower frequencies.

 

[John]

Well, I didn't suggest sticking it in front of a professional depolarisor cast around lower frequencies.

I know you didn't - i used the simplest & least amount of effort required without dismantling my set-up to pass away a few hours - end of.
I look forward to your results

 

[Channel Hopper]

I know you didn't - i used the simplest & least amount of effort required without dismantling my set-up to pass away a few hours - end of.
I look forward to your results

Currently there is no 5G within about four miles of here (I think I posted a few weeks back)

I did test a filtered LNB that had been donated, but I could only install a 1.8m reflector on the grounds nearby. Results weren't promising when in direct view of the tower, nor just over the ridge hence suggesting a solution built on basic physics.

 

[frankviana]

Lately some larger cities already have 5G and soon there will be expansion to other smaller cities. Here in Brazil there are already reports of interference and people are already looking for LNBF with filter.

Still on the analogue signal, there is a specific date for the shutdown because of 5G.

See the 5G map here:

5G no Brasil: mapa mostra todas as antenas nas 315 cidades com cobertura; confira

Início da ativação do sinal da quinta geração da internet completa 1 ano no país nesta quinta-feira (6), com 10 milhões de usuários. Veja se já existem antenas no seu bairro.

g1.globo.com

There is a government project to replace all the antennas of the band C with the band KU.

The process is already underway and many families have already benefited and have had their antennas exchanged.

Low -income people have already received free kits (LNBF+Antenna+Installation).

The goal is to eliminate band C to ordinary users and leave only for operators.

Everything below is in Portuguese. If anyone is interested in reading, please use the translator.

Migração do TVRO para a banda Ku poderá ser iniciada nas regiões metropolitanas

Decisão foi motivada por ganhos logísticos na distribuição e instalação dos kits de recepção e por melhor aproveitamento da comunicação da migração

www.gov.br

Kit de antena parabólica digital já foi distribuído a cerca de 10 mil famílias

O equipamento é instalado de forma gratuita para as famílias de baixa renda do CadÚnico

www.gov.br

Veja como receber o novo Kit Antena Digital distribuído pelo governo federal

O kit de TV parabólica do governo está sendo oferecido em 22 capitais do país, todas habilitadas para utilizar o serviço 5G.

concursosnobrasil.com

Cartela informativa | 5G TVRO | Distribuição de kits em Brasília

Conforme aprovado pelo Ministério das Comunicações e Anatel, a ABERT sugere a inserção da cartela informativa, de forma voluntária, na programação das...

www.abert.org.br

Channels StarOne D2 (70ºW): TVRO (ku band) - replace C band channels.

PORTAL BSD - TVRO

www.portalbsd.com.br

 

[Captain Jack]

That's a shame but expected. 70W is Europe's only source of analogue via satellite!

I wonder if anyone in Europe (mainland, that is, for any snartarses) managed to receive this satellite.

 

[Channel Hopper]

That's a shame but expected. 70W is Europe's only source of analogue via satellite!

I wonder if anyone in Europe (mainland, that is, for any snartarses) managed to receive this satellite.

Real time satellite tracking for: STAR ONE C4

Track satellite(s) STAR ONE C4 and see where are they located now. Check when there will be the next pass over your location

www.n2yo.com

Ireland, Portugal and perhaps a small region of Spain.

 

[Captain Jack]

Real time satellite tracking for: STAR ONE C4

Track satellite(s) STAR ONE C4 and see where are they located now. Check when there will be the next pass over your location

www.n2yo.com

Ireland, Portugal and perhaps a small region of Spain.

What am I looking at there?

 

[John]

What am I looking at there?

Footprint Graphics comparison from two different sources , offering confusion
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[Captain Jack]

Oooh .... right, well, that would explain the "spillover"

 

[hvdh]

N2YO doesn't show footprints at all, only the over-the-horizon area.
So indeed a nice spillover, or maybe Star One D2 has an undocumented "blob" to cover an area around Portugal as well.

 

[Channel Hopper]

N2YO doesn't show footprints at all, only the over-the-horizon area.
So indeed a nice spillover, or maybe Star One D2 has an undocumented "blob" to cover an area around Portugal as well.

Correct, though it does show elevation at the IP address (if not on a VPN).

Anything east of Spain is little more than 1.5 degrees above the horizon, so a large dish (on a stepladder on a high rise building) may be possible, at low tide in the mid-Atlantic.

 

[EnoSat]

Footprint Graphics comparison from two different sources , offering confusion

Draw footprint = satellite visibility, not signal coverage

 

[Captain Jack]

Draw footprint = satellite visibility, not signal coverage

It could technically be a global beam - seems unclear

 

[John]

It could technically be a global beam - seems unclear

Thank you CJ, that was the point of me putting up the two graphics that included the word 'Footprint' in the images which has proved to cause some confusion.

 

[Channel Hopper]

That's a shame but expected. 70W is Europe's only source of analogue via satellite!

Not quite, Es'Hail 2 has a dedicated transponder (10.489.675 V) for analogue services, though it is only 250kHz bandwidth.

 

[EnoSat]

It could technically be a global beam - seems unclear