C band at rascom 3.1

Nisatman

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I am new to c-band, and this forum but not to dx ing. Have been trying to get some c band channels, for couple of weeks, using my unknown make 1.2m solid dish. Last night managed to pull in booming signals from rascom 3.1, L T R 1 - L T R 7. I know these are linearly polarised channels, hence my success I believe! I have read the articles about the Dr polariser plate, but am interested in mastering the principals of circular polarisation with the supplied pfe. My question is do I rotate the lnb with the plate in it, or should I move the plate to various positions within the throat of the lnb? Clearly from reading other threads it is possible to pull in c band using a 1.2m prime focus, but I struggling ( part of the attraction), any useful advice very welcome.
 

Analoguesat

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LRT channels appear to be carried on Eutelsat 3A at 3.3E not Rascom at 2.8E

The depolariser changes circular polarity signals into linear, and I just played with its position until I got the best signals.
 

Nisatman

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Yes, I realised that it was eutelsat after I checked on lyngsat, sorry for being misleading. I had no luck with 1w or 5w trying this, maybe I should experiment with 20e as I note it has plenty of coveragis rom other post in this forum. It is not motorised system, so have to manually set up each time! As soon as I get some success with different bird ( oh err) I will post. Are there other linear c band channels worth trying?
 

Nisatman

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Thanks of course for replying so promptly. :)
 

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Quite a few sats out to the west are linear, both 55 and 58W are easy catches with a 1.2m, possibly the Silverbird tpndr on 37.5W too.
 

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Nisatman said:
My question is do I rotate the lnb with the plate in it, or should I move the plate to various positions within the throat of the lnb? Clearly from reading other threads it is possible to pull in c band using a 1.2m prime focus, but I struggling ( part of the attraction), any useful advice very welcome.

hi -
for circular there is no need to rotate the body of the l.n.b. - just place the plate inside the marked grooves in the throat - and try the plate at different depths within the throat - you should get results from the stronger C band sats. 20 east is a good one to try with a 1.2 dish -- for circular

What l.n.b and feed are you using on your 1.2m prime focus, ? ----


the pic is of an offset dish/feed using a standard plate

- cheers --
 

Nisatman

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Thanks for the suggestions, my view out west is restricted by neighbours house, although because of the non permanent nature of the installation I can try a different location in the garden for these western suggestions. Will let you know, probably later in week.
 

Nisatman

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Hi nelson b it's a bsc621 c/ku band lnbf. Thanks for the suggestion about the depths, I just jammed it in along the threads as deep as it would go, but figured that the benefits and increased signal discussed in other threads using a modified plate were related to moving it.....unsure which way. But your explanation has clarified this and will give it a go. :)
 

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Nisatman said:
Hi nelson b it's a bsc621 c/ku band lnbf. Thanks for the suggestion about the depths, I just jammed it in along the threads as deep as it would go, but figured that the benefits and increased signal discussed in other threads using a modified plate were related to moving it.....unsure which way. But your explanation has clarified this and will give it a go. :)

hi again--
i had a DMX741 C Ku LNBF (similar unit to the one you have) it had 2 sets of grooves for the dielectric plate, on opposite sides of the throat -- see picture - not sure if your B.S.C. is the same ?
i positioned the plate in a "ten to four" position on this l.n.b. when receiving circular --

on this dish - a 1.8 prime focus the best plate position was deep in the throat unlike the offset in the other post -

cheers :)
 

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Hi Nisatman,

I,ve an old 1.8 dish and thinking of having a go on cband, at the moment I dont know if I should mount the new LNB above or to the side of the existing LNB maybe you or some would know,
BTW I am also in the Down area.

Cheers,

shadbolt.





Hi nelson b it's a bsc621 c/ku band lnbf. Thanks for the suggestion about the depths, I just jammed it in along the threads as deep as it would go, but figured that the benefits and increased signal discussed in other threads using a modified plate were related to moving it.....unsure which way. But your explanation has clarified this and will give it a go. :)
 

nelson_b

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Hi Nisatman,

I,ve an old 1.8 dish and thinking of having a go on cband, at the moment I dont know if I should mount the new LNB above or to the side of the existing LNB maybe you or some would know,
BTW I am also in the Down area.

Cheers,

shadbolt.

hi - shadbolt. -

to the side generally --

What brand/make is your 1.8 dish --- and is it an "offset type" or a "prime focus" -- and is it motorised or fixed ?

some dishes are easier to adapt for extra l.n.b,s than others.

cheers :)
 

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Hi Shadbolt ..
A 1.8PF is an excellent tool for Cband dxing.
Is it a Prime Focus or Offset ?
You don't say which.
If a PF then I'd recommend at the focus ..as setting up an offset on such a dish isn't easy ..and of course ..such a large lnb plus feed will mask some signal reception.
If it's an offset then you can try mounting either side of the focus ..and adjusting the dishes position accordingly..
shouldn't be more than a few clicks if using a Vbox positioner.
Please post any results with pictures if possible..
..and welcome to the party..
We have a few UK Cband dxers ..but I don't think we have any in Ireland so results will be interesting.
If it's a fixed dish installation btw ..the further from the focus you place the lnb ...the less you will get..
..and do remember Cband signals are much weaker than most ku.
rgds
VS
 

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...beat me to the finish line Nelson...
must learn to type faster..
;)
rgds
VS
 

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Hi there shad bolt glad to see I not the only sat fan here in Ireland. Vipersan and nelson b really know their stuff and have loads of contributions worth reading. Since my post I haven't really had a lot of opportunity to dx as much as I'd like......heard that before!! But I was really pleased with myself at being able to pick up some c band on my 1.2 pf dish. Due to the temp nature of the mount I'm using I need a spell of decent weather lest it easy to spend 1 hr or so setting up..... To find its dark or there are others demanding your time. I'd be very keen to hear how you got on. . . . 1.8 m dishes aren't that common round here so good luck with the dx ing I reckon you should be able to get some interesting catches.
 

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Thanks to yourself, vipersan and nelson-b,

I.8 offset dish and at the moment if the rain hold off will have a go at seeing how I'm going to fix the LNB without obstructing the other LNB. Then once I've it fixed comes the fiddleing about with it to get a "catch".

shadbolt.

Hi there shad bolt glad to see I not the only sat fan here in Ireland. Vipersan and nelson b really know their stuff and have loads of contributions worth reading. Since my post I haven't really had a lot of opportunity to dx as much as I'd like......heard that before!! But I was really pleased with myself at being able to pick up some c band on my 1.2 pf dish. Due to the temp nature of the mount I'm using I need a spell of decent weather lest it easy to spend 1 hr or so setting up..... To find its dark or there are others demanding your time. I'd be very keen to hear how you got on. . . . 1.8 m dishes aren't that common round here so good luck with the dx ing I reckon you should be able to get some interesting catches.
 

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Hi there shad bolt glad to see I not the only sat fan here in Ireland. Vipersan and nelson b really know their stuff and have loads of contributions worth reading. Since my post I haven't really had a lot of opportunity to dx as much as I'd like......heard that before!! But I was really pleased with myself at being able to pick up some c band on my 1.2 pf dish. Due to the temp nature of the mount I'm using I need a spell of decent weather lest it easy to spend 1 hr or so setting up..... To find its dark or there are others demanding your time. I'd be very keen to hear how you got on. . . . 1.8 m dishes aren't that common round here so good luck with the dx ing I reckon you should be able to get some interesting catches.



Hi Nisatman, since my last I’ve taken delivery of an ESX242 and been searching the forum and found some excellent ideas for mounting it to the side of the existing LNB. With the festive season, I’ll be lucky to get in some fiddling time.

shadbolt.
 

Nisatman

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Hi shadbolt, sounds like a good buy. Did you go for the wsku2c conical scalar ring or you just using the ring supplied? I ask as the suggestion seems to be you can get significant gain , by using an improvised ptfe insert using a modified plastic chopping board. There are a few threads discussing the benefits. Is your 1.8m dish on permanent mount for ku band use currently, hence the mounting conundrum? Do you pick up any nilesat at 7w ? I really must get a more permanent mount sorted, which would allow a little more dx ing rather than setting up!! with the weather being in predictable I can't leave it unattended for any length of time.... Others woul say I never leave it (at all) lol. . . Let us know how you get on.
 

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Hi shadbolt, sounds like a good buy. Did you go for the wsku2c conical scalar ring or you just using the ring supplied? I ask as the suggestion seems to be you can get significant gain , by using an improvised ptfe insert using a modified plastic chopping board. There are a few threads discussing the benefits. Is your 1.8m dish on permanent mount for ku band use currently, hence the mounting conundrum? Do you pick up any nilesat at 7w ? I really must get a more permanent mount sorted, which would allow a little more dx ing rather than setting up!! with the weather being in predictable I can't leave it unattended for any length of time.... Others woul say I never leave it (at all) lol. . . Let us know how you get on.


Hi Nisatman,
This is what I had sent from LA ESX242 Quad Polar C Band LNBF - Dual Output, WS-KU2C Conical Scalar Ring Kit and as you say much info by the experts available. Need some bits from the hardware shop then I might get a chance to start doing something will take a bit of time but will get there, eventually. On Nilesat 7w I receive a lot of watchable channels.

shadbolt.
 
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