Raminto
join:2006-02-28
Whitehorse, YT
| [Installer] Different LNB's on TRIA
LNB 1 | 
LNB 2 |
Today I went back to the system with the signal of 60 and changed the TRIA (same part number) with a new one, the only difference was the LNB on it and the signal was 88 right away without moving the dish.
The attached pictures:
LNB 1: the one I could not get a signal over 60 (made in China)
LNB 2: the one I put on today and got a signal of 88 right away (made in Taiwan)
Does anyone know if this difference in signal strength is related to the different LNB's?
PS: I already checked for any obstruction inside the feedhorn and as far I can see down the wave guard.
Thanks____Raminto
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dw7000/.98m/2watt/Horizon1/1390/256k4/5 /xp sp2/desktop compaq 6330CA/linksys wireless/thinkpad xp pro/Toughbook CF-28 xp pro |
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grohgreg
Dunno. Ask The Chief
join:2001-07-05
Dawson Springs, KY
| On the surface, it sounds like the Chinese LNB is markedly less sensitive. But I'm not quite sure of your terminology. Wave "guard" for example, has a TX-only function. So I took the liberty of labeling one of your photos. Hope you don't mind.
So when you say "swapped LNB", is that literal? That is, did actually you swap the LNB only? or the LNB+OMT assembly? or the entire LNB+OMT+feedhorn?
//greg//
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HN7000S/74cm/1w/ProPlus - G16/1250H/Germantown - NAT 66.82.187.152/Gateway 66.82.25.10/DNS 66.82.4.12 and 66.82.4.8 - Firefox - AVG+Firewall v7.5 |
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Raminto
join:2006-02-28
Whitehorse, YT
| Sorry I confused you. I actually meant signal path. With the feedhorn removed I could not see any obstruction and the o-ring was in place.
Yes, I replaced the hole thing, not just the LNB.
Greg, you say that the Chinese LNB is less sensitiv. Does this mean there is nothing really wrong with it, it just gives me a lower signal and the system will work the same way as with the other LNB?
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dw7000/.98m/2watt/Horizon1/1390/256k4/5 /xp sp2/desktop compaq 6330CA/linksys wireless/thinkpad xp pro/Toughbook CF-28 xp pro |
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grohgreg
Dunno. Ask The Chief
join:2001-07-05
Dawson Springs, KY
| Well, that's a loaded question. If you search the internet for Ku-band LNBs, you'll find a wide variance in receive sensitivity. More sensitive = more expensive. But it makes no sense why Hughes provide mismatched LNBs for the same TRIA. Unless one of those TRIAs is not from Hughes. If they're both Hughes stock, then the Chinese one would seem to be the less sensitive of the two - a probable factory defect. Alternatively - if 88 seems a comparatively high RSL, the Taiwanese LNB might be OVER-sensitive.
Given the info provided, that's the best I can do - sorry.
//greg//
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HN7000S/74cm/1w/ProPlus - G16/1250H/Germantown - NAT 66.82.187.152/Gateway 66.82.25.10/DNS 66.82.4.12 and 66.82.4.8 - Firefox 3 - AVG+Firewall v7.5 |
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Raminto
join:2006-02-28
Whitehorse, YT
| Both assemblies are from Hughes and both where new out of the box.
As we often have to use Horizons1 up here because of the higher elevation, we use this bird often and the signal is usually between 85 and 92 and exactly this confused me, why I should get only 60 all of a sudden. My own dish is on Hor1 as well.
The Chinese TRIA is already back in the box and ready to be returned.
Thanks____Raminto
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dw7000/.98m/2watt/Horizon1/1390/256k4/5 /xp sp2/desktop compaq 6330CA/linksys wireless/thinkpad xp pro/Toughbook CF-28 xp pro |
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seeya
Premium
join:2007-06-02
Pahrump, NV
 ·HughesNet Satellit..
| FWIW - Last fall I noticed about a 5-6 point lower reading in SQF on HOR1 1270 with a .74 reflector. This was at a site in Idaho where the only thing I changed was the TRIA. Just like in your pictures, the FRU TRIA had the smaller sized, made in China LNB. The one I replaced had the larger sized made in Taiwan LNB. |
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mark470
eh?
Premium
join:2002-01-09
Contoocook, NH
 ·Comcast
| reply to Raminto
same specs pretty much ,just a bum unit hughesnet is not the highest quality hardware on the market. i see way to many water in the odu problems, hardly ever on spacenet or i-direct.
and tria is a wildblue word.
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my heart belongs to a canadian, she is the best. |
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grohgreg
Dunno. Ask The Chief
join:2001-07-05
Dawson Springs, KY
| said by mark470  :and tria is a wildblue word. Actually, it's a standard industry acronym: Transmit/Receive Integrated Assembly. The attached graphic was just scanned from an 7 year old Hughes DW4000 manual
//greg//
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HN7000S/74cm/1w/ProPlus - G16/1250H/Germantown - NAT 66.82.187.152/Gateway 66.82.25.10/DNS 66.82.4.12 and 66.82.4.8 - Firefox 3 - AVG+Firewall v7.5 |
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