Welcome to GOFASTMOTORSPORTS.com ... ... ... Green Flag - Green Flag - Go Go Go ... ... Brought to you by Ricks Satellite - Where the Big Dish Rules!

Ricks Satellite Wildfeed and Backhaul Forum
Register Latest Topics
 
 
 


Reply
  Author   Comment   Page 3 of 3      Prev   1   2   3
boblop

Avatar / Picture

Registered:
Posts: 2,767
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.
__________________

Never throw it away--almost never!

pendragon

Registered:
Posts: 1,017
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

Avatar / Picture

Registered:
Posts: 888
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

Registered:
Posts: 1,017
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

Avatar / Picture

Registered:
Posts: 571
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?
__________________
Receivers: AzBox Ultra, Micro HD
-10' dish with Chaparral Corotor II/Norsat DRO LNBs
-36"Ku with SG2100 & PLL321S-2 --... ...--
Hockeynut

Avatar / Picture

Registered:
Posts: 9,424
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 


__________________
Dish`s--10' KTI,10' Button Hook,10' Unimesh x2, 12' Cosmos,8 1/2 foot Birdview in the works.
1.2 Ch Masters parked at 91,103,105...1.2 Ch Master on a factory Ch Master polar mount tracking from 58-127.
Positioners--Gbox,Vbox and ASC1`s
Receivers--AZMe,AZPlus,AZElite,Icecrypt S1600 HD,Pansat 9500,VU Solo2 SE,Octagon SF4008 UHD 4K,Prof 7500,TBS 6982.

Jim

Avatar / Picture

Registered:
Posts: 1,206
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

Avatar / Picture

Registered:
Posts: 571
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]

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

Avatar / Picture

Registered:
Posts: 1,625
Reply with quote  #39 
Impressive configuration Hockeynut!  Did you say "downscaling"?  Fewer dishes these days?  No!
__________________
"My neighbors cut down their weeping willow and GO CUBS! "
Hockeynut

Avatar / Picture

Registered:
Posts: 9,424
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
__________________
Dish`s--10' KTI,10' Button Hook,10' Unimesh x2, 12' Cosmos,8 1/2 foot Birdview in the works.
1.2 Ch Masters parked at 91,103,105...1.2 Ch Master on a factory Ch Master polar mount tracking from 58-127.
Positioners--Gbox,Vbox and ASC1`s
Receivers--AZMe,AZPlus,AZElite,Icecrypt S1600 HD,Pansat 9500,VU Solo2 SE,Octagon SF4008 UHD 4K,Prof 7500,TBS 6982.

Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

Thank You for Visiting GOFASTMOTORSPORTS.com - Keep Your Eyes on the Sky and the Track!