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boblop

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Reply with quote  #31 
Yes all of the Norsat lnbs that I have opened up have, as soon as the D.C. voltage is separated from the rf signal pass the D.C. power through a voltage regulator.  Thus much of the higher voltage level is "thrown away" and you end up with a lower voltage which is what powers the Norsat lnbs. I see no real issues with the lower voltage feed and Norsat lnbs. Perhaps if your dish is 3 miles from your house then you could worry about voltage levels at the end of your coax.
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pendragon

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Reply with quote  #32 
Quote:
Originally Posted by majortom
The only reason I can think of for modifying a powered multiswitch switch is that some people think their LNBs will operate better at the higher voltage, for some reason.


All of my current C-band LNBs are Norsat 8115s, which are specified for operation from +15 to +24V. They operate at lower voltages and I have tested them in a lab environment at +13V, where they were slightly noisier than at +18V. In the real world LNBs draw current, cable has DC resistance, oxidation affects connections, etc., so +13V at the receiver will never be +13V at the LNB. Your mileage may vary.

As an aside, dozens of my LNBs are powered through banks of modified Zinwell 6x8 switches (unpowered) from a couple of high performance switching power supplies dishing out 6A at +18V. The supplies work great, but after around two years of operation they fail and need capacitor replacements, of course always at the least opportune times. 

There are a number of transponders I record or receive 24/7 from these LNBs, and when I last installed another C-band dish, I had a lot of problems with high winds throwing off the alignment. As a temporary measure I had my servers log the transponder CNRs so I knew when to retweak the dish.

After I redesigned the mounting, wind no longer matters, but I didn't bother to turn off the logging. Several months later some of my CNRs started dropping very slowly on different dishes. I checked the relevant power supply, and it was down to around 16V. First time I caught a failing supply before it broke. Although this is one anecdotal case with uncontrolled variables, the CNR reductions at lower supply voltages applied to multiple LNBs.
rempfer

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Reply with quote  #33 
You guys are great.  Thanks!  Me the combo LNBF guy should be able to use a 4-port DiSEqC switch to feed the four (2ku, 2c) LNBs into one coax then, and to the house.
pendragon

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Reply with quote  #34 
Quote:
Originally Posted by boblop
Yes all of the Norsat lnbs that I have opened up have, as soon as the D.C. voltage is separated from the rf signal pass the D.C. power through a voltage regulator.  Thus much of the higher voltage level is "thrown away" and you end up with a lower voltage which is what powers the Norsat lnbs.


Precisely why they are noisier. Measure most analog voltage regulators at different supplied voltages and see how much quieter they are when you have more margin. Many years ago I designed several studio-grade audio mixing boards, and quiet audio circuitry required a lot of effort on the power supply side.
GFM

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Reply with quote  #35 
Hmmm.. might have to pick up a couple of those WNC SWA-48 switches. Always looking to expand the system here. Saves some connections when using powered switches without the inserter in-line. I power the Zinwells with a 24v 9a power supply in the house that feeds power to the switches in a weather proof box, rather than running 125VAC outside. Maybe the WNC switches use 24v as well?
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Receivers: AzBox Ultra, Micro HD
-10' dish with Chaparral Corotor II/Norsat DRO LNBs
-36"Ku with SG2100 & PLL321S-2 --... ...--
Hockeynut

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Reply with quote  #36 
Updated pic of the switching after downscaling the farm..I really have no need for the 16x1`s and 8x1`s anylonger.Could get by just fine with 4x1`s.

2.jpg 


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Dish`s--10' KTI,10' Button Hook,10' Unimesh x2.
1.2 Ch Masters parked at 91,103.
1.2 Ch Master with factory polar mount tracking from-58w-127w -Western Ku Dish.
1.2 Ch Master with factory polar mount tracking from-12.5w-81w -Eastern Ku Dish.
Positioners--Gbox,Vbox`s.
Receivers--AZMe,AZPlus,AZElite,Icecrypt S1600 HD,VU Solo2 SE,Octagon SF4008 UHD 4K,Prof 7500,TBS 6982,TBS 6902.

GOD BLESS AMERICA.
Jim

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Reply with quote  #37 
Nice job Hockeynut! Awesome. Good idea keeping them in a separate building that an easily be accessed. I have my modest switches on a small board like that in the house hidden behind a cabinet.
GFM

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Reply with quote  #38 
That's a lot of wiring Mr Hockeynut!
Nice to have a walk-in enclosure to have your switches etc.
My enclosure is maybe 18" cubed... it's getting rather small, and the wiring is getting very unruly! You are giving me ideas... Might have to do some building this winter... [smile]

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Receivers: AzBox Ultra, Micro HD
-10' dish with Chaparral Corotor II/Norsat DRO LNBs
-36"Ku with SG2100 & PLL321S-2 --... ...--
Pops

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Reply with quote  #39 
Impressive configuration Hockeynut!  Did you say "downscaling"?  Fewer dishes these days?  No!
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Hockeynut

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Reply with quote  #40 
Thanks Jim,GFM and Pops...Yup downscaling pops..Man you should have seen the wiring before I downscaled going to those honkin 16x1`s...Ehhh yeehhh yeehhh
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Dish`s--10' KTI,10' Button Hook,10' Unimesh x2.
1.2 Ch Masters parked at 91,103.
1.2 Ch Master with factory polar mount tracking from-58w-127w -Western Ku Dish.
1.2 Ch Master with factory polar mount tracking from-12.5w-81w -Eastern Ku Dish.
Positioners--Gbox,Vbox`s.
Receivers--AZMe,AZPlus,AZElite,Icecrypt S1600 HD,VU Solo2 SE,Octagon SF4008 UHD 4K,Prof 7500,TBS 6982,TBS 6902.

GOD BLESS AMERICA.
rempfer

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Reply with quote  #41 
Just received my DP-4 along with 2 each Norsat 4106A's ans 5150F's.  I removed the dielectric plates.  

I notice the instructions say:
Code:
3. Align the waveguide flanges 
parallel and perpendicular to the 
polar axis of the dish.  The polar 
axis is the vertical line through 
the dish when it is pointing south.

The associated graphic in the pamphlet shows (a) what I think you guys are calling the vertical Ku feed oriented with its longer rectangular edge horizontal and (b) the C feeds at 10:30 and 1:30 clock positions.  This seems confusing/contradictory.  What am I missing?  How should the feed actually be oriented?  Is the longer rectangular edge the key to vertical & horizontal orientations?
Jim

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Reply with quote  #42 
Remfer I do not have the DP-4 but do have the Bullseye 11 and if you look at the picture of the DP-4 in Ricks online catalog I believe when your facing the dish at your southern most satellite or close to it should be oriented like in the picture. Here's the instructions for the Bullseye like I have. Hope this helps.

http://www.satelliteguys.us/xen/attachments/bullseye-ii-feed-horn-pdf.99346/

rempfer

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Reply with quote  #43 
Thanks, Jim.

I got the feedhorn & LNBs installed on a 10' mesh dish.

This dish was struggling mightily to receive C & Ku feeds with a combo C & Ku LNBF.

Because the dish followed the arc pretty well, I left it alone and just installed the new DP-4 with Norsat LNBs I got from Rick.  I didn't try to peak anything, just hooked up to a four-port DiSEqC switch and headed for the house.

Using my TBS6983 with CrazyScan I've been creating four entries for each satellite that has both C & Ku transponders (C-band Horizontal, C-band Vertical, Ku-band Horizontal, Ku-band Vertical).

The performance is stunning!  I don't think I'll be able to sleep tonight account of the grin that I just can't wipe off my face.

Thank you, everyone, for your help.  And of course thanks to Rick for making it all possible.
RickCaylor

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Reply with quote  #44 
This is an Awesome and Fun Hobby!  Glad we can be a small part of the Fun!

Way to go Mr. Rempfer!!!

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Hockeynut

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Reply with quote  #45 
Congrats rempfer.[smile]
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Dish`s--10' KTI,10' Button Hook,10' Unimesh x2.
1.2 Ch Masters parked at 91,103.
1.2 Ch Master with factory polar mount tracking from-58w-127w -Western Ku Dish.
1.2 Ch Master with factory polar mount tracking from-12.5w-81w -Eastern Ku Dish.
Positioners--Gbox,Vbox`s.
Receivers--AZMe,AZPlus,AZElite,Icecrypt S1600 HD,VU Solo2 SE,Octagon SF4008 UHD 4K,Prof 7500,TBS 6982,TBS 6902.

GOD BLESS AMERICA.
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