I'm looking for Universal LNB with C120 waveguide port
Bobben
part of my antenna ?
I got this LNB at the moment
http://www.tveco.no/image/produkter/mti_twin_universal.gif
Because I'm using a dual reflector offset dish the LNB won't fit without
mounting the LNB up side down 90 degrees on the feed
(http://www.tveco.no/image/produkter/feed_fibo.gif ). . Another problem is
that the Digistar LNB has wery high gain and low saturation point compared
to Cambridge and most other LNB's.
Cambridge LNB's is OK but I'm told their Universal C120 LNB's is not sold
anymore.
http://www.cambridge-lnb.com/products/view.asp?id=82
This LNB won't shadow any signal between main and subreflector.
I would appriciate if somebody have links to LNB's that is shaped like the
Cambridge LNB's. Maybee some online satellite stores ?
Jens
Free Online Satellite Calculations on :
http://home.online.no/~jensts/satellite.html
R. Mark Clayton
"Bobben" <jen...@online.no> wrote in message
news:ZH256.8748$v46.2...@news1.oke.nextra.no...
> Does somebody know where I can get a Universal LNB that would not "shadow"
a
> part of my antenna ?
>
> I got this LNB at the moment
> http://www.tveco.no/image/produkter/mti_twin_universal.gif
This looks just like my LNB.
>
> Because I'm using a dual reflector offset dish the LNB won't fit without
> mounting the LNB up side down 90 degrees on the feed
> (http://www.tveco.no/image/produkter/feed_fibo.gif ).
This looks like the feed horn on my 1.2m Fibo Gregorian dish (made in
Norway!).
> Another problem is
> that the Digistar LNB has wery high gain and low saturation point compared
> to Cambridge and most other LNB's.
Can't help on this one.
>
> Cambridge LNB's is OK but I'm told their Universal C120 LNB's is not sold
> anymore.
> http://www.cambridge-lnb.com/products/view.asp?id=82
> This LNB won't shadow any signal between main and subreflector.
>
> I would appriciate if somebody have links to LNB's that is shaped like the
> Cambridge LNB's. Maybee some online satellite stores ?
Not seen an axial twin C120 LNB anywhere, however on my dish the LNB just
fits when rotated through 180 with one cable going down each side of the
secondary dish arm. I have got a IRTE circular waveguide magnetic polariser
(to fine tune the skew), which may make it an easier fit, alternatively you
could use a long or short piece of waveguide to displace the LNB nearer the
primary to reduce the shadow.
>
>
> Jens
>
> Free Online Satellite Calculations on :
> http://home.online.no/~jensts/satellite.html
>
>
>
>
Good luck!
--
R. Mark Clayton
Bjørn Oskarsen
C-120 innfesting passende til Fibostøp parabol. Jeg kjøpte et der en uke
før jul.
Tlf: 63 87 40 10
Er de tomme så har Philips Norge.
Lykke til.
Take a phone to Tantec, which is located in the same building as Tveco, they
have lnb with C-120 flange suitable for Fibostøp antenna.
I bought one myself at Tantec one week before cristmas.
Telephone: 47 63 87 40 10
If they shouldn´t have any, contact Philips Norway.
Good luck.
"Bobben" <jen...@online.no> wrote in message
news:ZH256.8748$v46.2...@news1.oke.nextra.no...
Jomtien
>Cambridge LNB's is OK but I'm told their Universal C120 LNB's is not sold
>anymore.
>http://www.cambridge-lnb.com/products/view.asp?id=82
>This LNB won't shadow any signal between main and subreflector.
>
>I would appriciate if somebody have links to LNB's that is shaped like the
>Cambridge LNB's. Maybee some online satellite stores ?
Most of the advertisers in WotSat seem to do that sort of "straight"
LNB with 120 flange.
--
Only the truth as I see it.
No monies return'd. ;-)
Bobben
> This looks like the feed horn on my 1.2m Fibo Gregorian dish (made in
> Norway!).
It is a Fibo. Wish I had a 1.2m....
> Not seen an axial twin C120 LNB anywhere, however on my dish the LNB just
> fits when rotated through 180 with one cable going down each side of the
> secondary dish arm. I have got a IRTE circular waveguide magnetic
polariser
> (to fine tune the skew), which may make it an easier fit, alternatively
you
> could use a long or short piece of waveguide to displace the LNB nearer
the
> primary to reduce the shadow.
I guess that can be done but I have also discovered that the Digistar LNB
fits badly on the C120 port on the Fibo. I had a look at the output of the
LNB with a spectrumanalyzer and it's looking awful. I think it's the LNB.
Looks like saturation and maybee reflections in wavguide caused by misfit
between C120 port and the Digistar LNB..
I might opt for OMT and two SMW WDL LNB's with low gain and a smart switch.
I'm sure that the spectrumanalyzer will show better results.
I could do with a single axial Univ. LNB.
As the situation is now the system works worse than a 72cm and remember that
Fibo 90 has about 80% efficiency which is about 20% higher than average. I
have a spare Fibo 90 I will try later just to be sure it is not the antenna
that is bad.