Ka lnb ?

[Channel Hopper]

It's not about the ODU itself but the way they can be utilised / approved for terrestrial use once additional isolation is installed.

I have the document somewhere in the office, it's more to do with point to point systems than uplinking to a geostationary satellite.

Not quite the one I was looking for.

(PDF) Technical Challenges for Cognitive Radio Application in Satellite Communications

PDF | During the last years, spectrum scarcity has become one of the major issues for the development of new communication systems. Cognitive Radio (CR)... | Find, read and cite all the research you need on ResearchGate

www.researchgate.net

 

[Channel Hopper]

Thank you for your feedback and your explanation and I completely validate your analysis.
But I have my idea...
yes it's a game run by my wallet...
I don't have the budget for a full band LNB or several LNBs at 300 euros for each part of the band.
I remember modifying several LNBs 20 years ago to drag the frequency up or down.
I'm not saying it's possible with the SORASAT LNB but it covers the central part of the spectrum and so if it's possible it's the most suitable for testing.
it is also possible that it covers a little more than expected.

Probably a bit late but Triax also have a Ku band LNB in their catalogue.

 

[zorrin]

Probably a bit late but Triax also have a Ku band LNB in their catalogue.

View attachment 141947

I think it's the same, it looks the same...

Anyway, I'm expecting the same double-output LNB this week, two AN8004s and one AN8002.
I hope to receive 3 other AN8002 before the end of the month.
three are not for me but for other forum users.

My idea now is to use almost directly:

One AN8002 modified for A-band
One AN8002 for B-band
One Twin Ka LNB for the B-band
One AN8004 for a part of the D-band

I hope that this whole team will fit on a LNB changer managed by the positioner of @dreambox1959

 

[Channel Hopper]

I think it's the same, it looks the same...

Anyway, I'm expecting the same double-output LNB this week, two AN8004s and one AN8002.
I hope to receive 3 other AN8002 before the end of the month.
three are not for me but for other forum users.

My idea now is to use almost directly:

One AN8002 modified for A-band
One AN8002 for B-band
One Twin Ka LNB for the B-band
One AN8004 for a part of the D-band

I hope that this whole team will fit on a LNB changer managed by the positioner of @dreambox1959

If you are using the CM reflector, think about reinforcing the feed arms before fitting.

The Triax and Labgears have different casings, though they could be the same internally. I may attempt to remove the covers later if I get 10 minutes.

 

[zorrin]

If you are using the CM reflector, think about reinforcing the feed arms before fitting.

The Triax and Labgears have different casings, though they could be the same internally. I may attempt to remove the covers later if I get 10 minutes.

yes I have been thinking about reinforcement for a while now.
At the same time I took note that the focal point is not good and that it is necessary to limit the weight of the structure because of the weight of the DiSEqC motor and all LNB...
I will have lot of fun

 

[excollier]

Thank you @Channel Hopper
56 euros delivered, I just took one

darn, just seeing this, I have a couple of brand new, unused Inverto Ka lnbs in the garage, I'll go search them out - need to get rid..like this

Saorsat Ka Band LNB (Labgear)

Saorsat KA Band Twin LNB Brand new complete with 12 months manufacturers warranty Ka Band LNB Features SAORSAT is the name given to the infill free-to-air satellite television service put in place by RTÉNL to deliver Irish television services to the 1% to 2% of homes that are not covered by the...

freesat.ie

 

[Llew]

The Triax and Labgears have different casings, though they could be the same internally.

The Triax is fatter than the Inverto. Differences include dipole and LOF doubling arrangements. Teflon filter damping on Inverto mine.

 

[Llew]

Incidentally, does anyone know why the designers of the Saorsat LNB used a 10.6 GHz Hi band KU DRO instead of a Ka Band B DRO (9.125 GHz)? Cheaper to source?

 

[Channel Hopper]

The Triax is fatter than the Inverto. Differences include dipole and LOF doubling arrangements. Teflon filter damping on Inverto mine.

View attachment 141949

View attachment 141950

My Triax dismantled, layout somewhat different to yours. Just need Zorrin to rip his new purchase apart.

 

[zorrin]

My Triax dismantled, layout somewhat different to yours. Just need Zorrin to rip his new purchase apart.

Ok, next week-end

 

[s-band]

Incidentally, does anyone know why the designers of the Saorsat LNB used a 10.6 GHz Hi band KU DRO instead of a Ka Band B DRO (9.125 GHz)? Cheaper to source?

Maybe. The high side LO could be to avoid a system spurious or to take the image out of a busier part of the band.

It looks like the Triax uses harmonic mixers (anti-parallel diodes fed by 10.6G, i.e. fLO/2) whereas the Inverto has a doubler with the mixers fed by 21.2GHz (2 x osc frequency)

 

[Channel Hopper]

Maybe. The high side LO could be to avoid a system spurious or to take the image out of a busier part of the band.

It looks like the Triax uses harmonic mixers (anti-parallel diodes fed by 10.6G, i.e. fLO/2) whereas the Inverto has a doubler with the mixers fed by 21.2GHz (2 x osc frequency)

A lot of the Triax components could be used in many other devices.

This may be of interest

M0DTS.co.uk

www.m0dts.co.uk

 

[zorrin]

darn, just seeing this, I have a couple of brand new, unused Inverto Ka lnbs in the garage, I'll go search them out - need to get rid..like this

Saorsat Ka Band LNB (Labgear)

Saorsat KA Band Twin LNB Brand new complete with 12 months manufacturers warranty Ka Band LNB Features SAORSAT is the name given to the infill free-to-air satellite television service put in place by RTÉNL to deliver Irish television services to the 1% to 2% of homes that are not covered by the...

freesat.ie

A little too late my friend.
It's like me, I've been trying for 3 days to find 2 or 3 AN8002s for friends in this forum and I only have good feedback for AN 8004...
Obviously it's usually the hardest to find...

 

[Llew]

Maybe. The high side LO could be to avoid a system spurious or to take the image out of a busier part of the band.

Yes, thanks, I can understand that. Gives a 20.2 => 19.7 - reversed image.

It looks like the Triax uses harmonic mixers (anti-parallel diodes fed by 10.6G, i.e. fLO/2) whereas the Inverto has a doubler with the mixers fed by 21.2GHz (2 x osc frequency)

I can see how the Inverto doubler works - the Triax, I'll need to study that one a bit further

 

[ViaHussun]

My KA band LNB





What will the mod be like? can you help me too?

 

[Llew]

Some playing around with a Saorsat LNBF here -

KA Band C with a modded Inverto LNB

Another day, another Inverto... I needed a spare feedhorn for my KA LNBs, and as the one removed from the Inverto KA LNBF I had outperforms the Norsat FD1000 on them, I aquired another one with the intention of depriving that of said feedhorn. Before I do that, I thought I'd experiment with...

www.satellites.co.uk

An Inverto Ka LNB Band B To Band A Mod

Here is my effort at converting the Eutelsat KA-Sat Inverto Twin LNBF into a Band A receiving LNB. It's not a magic solution - these LNBs are designed specifically for receiving the Saorsat FTA services in Ireland. However, it's possible to modify parts of the LNB's circuitry to access some or...

www.satellites.co.uk

 

[s-band]

the Triax, I'll need to study that one a bit further

This is in patentese US4099228A - Harmonic mixing with an anti-parallel diode pair - Google Patents but the diagrams give the essentials. The Gilats use the same type of mixer.

 

[zorrin]

Just to be sure, this is the only part needed ?


And this part is already a Tx part ?

 

[zorrin]

Ho yes i received today the first AN8004 but it’s a broken one from a friend.



Some water leak inside…

 

[John]

Ho yes i received today the first AN8004 but it’s a broken one from a friend.

View attachment 141989

Some water leak inside…

It's a shame it has water damage but it might be reparable - the polorisor and feed are very useful though for any future projects.
I find that the scalar feeds match very well onto Gibertini or CM reflectors.