WS International Wholesale Distributor of Satellite Telecommunications Equipment | Free To Air / FTA, Receivers, Dish, Satellite Dish Antennas, DiSEqC Switches, DiSEC Motors, C & Ku Band LNB & LNBFs, and much much more.....



Atlanta Branch:


Los Angeles Branch:



+1 770-420-5272


+1 818-485-8350

All WS International Brand Equipment Carry A



Tour Our China Office & Factory


Satellite Receivers



- Omegasat DSB6000U

- Omegasat DSB-5701

- Omegasat DSB-5700

- 16GB USB Flash Drive


Remotes & Extenders

- Wireless Extender

- Omegasat DSB5700

- Omegasat DSB5701




- ESX521FE Single LNBF

- Blue Blazer Ku LNBF

- ESX521UFE Single LNBF

- ESX521U-AM Monoblock

- ESX522FE Dual LNBF

- ESX522UFE Dual U. LNBF

- 521 Single LNBF

- 522 Dual LNBF

- 524U Quad LNBF

- ESX5421 Monoblock

- 741 CKU LNBF


- LKU1-2A Universal

- Chaparral Single LNB

- Stealth Bullet U1


- Star Bracket


C Band

- ESX211 C Band LNB

- ESX244 C Band LNBF

- ESX242 C Band LNBF

- ESX241 C Band LNBF

- 241 C Band LNBF

- 242 C Band LNBF
- 741 CKU LNBF

- NS741 C/Ku LNBF

- NS741U C/Ku LNBF

- WSKU2C Conical Scalar


Satellite Dishes

- WS7630 - 75cm Ku

- DS2076 - 76cm Ku

- WS9036 - 90cm Ku

- WS1247 - 120cm 

- WS1247M - 1.2m

- WS1870P - 6ft

- WS1870 - 1.8mts

- WS24095 - 240cm

- WSKU2C Conical Scalar

- WS40MM-P Clamp

LNBF Holders & Brackets





- R4-DTV


- WSKU2C Kit

- STAR Bracket


Motors & Controllers

- VBox-X Positioner
- SG-9120 HH Motor
- SG-9120B HH Motor
- PMA24 36V Actuator
- SG-6000 HH Motor


RS232 Cables

- RS232 Cables NM

- RS232 Cable Serial


Satellite Switches

- 22KHz Switch

- 4X1 DiSEqC Switch

- 4X1 DiSEqC With HD

- 2X1 DiSEqC Switch

- 3X4 Multi-Switch

- Diplexers


Satellite Installation

- FastAlign« 5100Pro

- FastAlign« 7100Pro

- DIY Install Kit

- Installation Tools

- SF95 Satellite Finder

- SF110+C Sat Finder

- DSF120+ Finder

- SF99 Finder Kit

-Sat Finder Battery Holder

-Installation Supplies


Satellite Meters & Finders

- FastAlign« 5100Pro

- FastAlign« 5110Pro

- FastAlign« 6100Mini

- FastAlign« 7100Pro

- SF95 Satellite Finder

- SF110+C Sat Finder

- DSF120+ Finder

- SF99 Finder Kit
-Sat Finder Battery Holder



Are you a broadcaster and need to get equipment to your viewers, affiliates, engineers, or resellers?  Contact WS International for our broadcasters program.  WS International pioneered the broadcaster program in the satellite industry.  Contact us for full detailed information and to see how we can help you with your needs.

Contact Us 

WS International ESX521U-AM FSS Single Ku Band Standard LNB

Model: ESX521U-AM

Adjustable Ku Band Monoblock LNBF

Adjusts between 4 degrees to 12 degrees!

Excellent choice for Galaxy 19 & SES 1 or any other satellites within 4-12 degrees of spacing!

If you want the best, Rely On WS!


Difference between the ESX521U-AM adjustable monoblock and other traditional fixed monoblocks:


  ESX521U-AM Adjustable Monoblock Other Fixed Monoblocks
Adjusts to receiver signal from other satellites: Yes No
Range of adjustment: 4 - 12 degrees 4 degrees only
Built in DiSEqC switch: No Yes
Warranty period: 2-Years 0 - 2 Years*

Fits standard  40mm LNBF brackets available on all satellite dishes with out an adapter:



Manufactured by WS International:



*Warranty offered depends on manufacturer.  WS International offers a 2-year warranty on all C, Ku, and CKu band LNBFs.  WS International manufactures a fixed 4-degree monoblock, model# ESX5421U


This adjustable monoblock can also be used as two single LNBFs.  You can separate each side and use them individually as

single output universal Ku LNBFs.  Click any of the pictures below to enlarge


Though in some areas, you may be able to use a 75cm satellite dish for multiple satellite reception, the minimum recommended dish size is a 90cm satellite dish.  Check out our WS9036 90cm satellite dish!  It's the best satellite dish to use for this new adjustable monoblock LNBF.
The ESX521U-AM does not have a built in switch like your traditional monoblock.  You will need to use an external DiSEqC switch.  Check out our switch section!


Technical Specifications

Input Frequency Range 10.7 - 12.75 GHz
L.O. Frequency 9750/10600MHz
L.O. Stability 1 MHz (-40 - +70░ c)
Ouput Frequency Range 950 - 2150 MHz
Noise .2dB typical
Conversion Gain 60dB typical
Input VSWR 2.5:1
Output VSWR 2.0:1 (max)
Connector F Type female
Impedence 75 ohm typical
Cross Polar Isolation >25dB (min.)
Image Rejection 45 dB (min.)
Phase Noise -50dBc @ 1 KHz
-75dBc @ 10 KHz
-95dBc @ 100KHz
Supply Voltage

Ca: 11.5 - 14.0 V = Vertical Polarization
Cb: 15.5 - 19.0 V = Horizontal Polarization

Operating Temperature -40 - +70 degrees Celsius
Storage Temperature -40 - +80 degrees Celsius
Relative Humidity 0 - 95 %
Throat Diameter 40mm



"The Newest, Best Performing, & Highest Quality LNBF

 To Hit The Satellite Industry!"


Longer neck allows for F/D better adjustment in order to adjust for better reception!


Not just a pretty colored LNBF, it also outperforms the competitions!


Try one out for yourself!  You'll be surprised by the performance & quality of this all new Ku band Standard LNBF!


WS International is the exclusive manufacturer

and distributor of the ESX line of C, Ku, & CKu LNBFs

If you are in the satellite business throughout the USA, you will get the lowest prices

on your product and equipment from WS International!

Join our network of resellers, installers, & online dealers for excellent benefits!

Need to order in large quantities?  Contact Us Today!


If you are sick and tired of selling other inferior brands that only

offer a limited warranty, and not making money

because the market is flooded with these inferior products, give our equipment a try

and start making more money by offering a more reliable, and a

product with higher profit margin & better warranty.

The ESX521U-AM is the newest LNBF to hit the satellite industry with the newest technology.  This a high stability, high gain, yet low noise figure single LNB allows reception of Ku band signals with the highest possible signal level and quality.  Fits any standard Ku band satellite dish with a 40mm universal LNBF mount.  Use this with your Free To Air receiver for excellent and superior Ku band reception.  This LNBF will outperform most 0.1dB LNBFs on the market! 


This line is sure to quickly become upon the favorite brand and model among satellite technicians, dealers, resellers, network & cable TV engineers, operators, and hobbyist, just as our previous line did.  If other brands are just not performing to the highest standards, try the latest WS International brand products.  With an un-heard of 2-year warranty, you can rest assured that you'll get the best performance year after year after year!



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Want to know where the LNB & LNBFs that you purchase from WS International come from?

Take a tour inside of our factory.  WS International is the most credible and reliable manufacturer of satellite related products.  Here is a small glimpse inside our factory.  From our factory to your home.  Ever wondered how WS International can offer such high quality products at low prices?  It's simple: Thanks to our part supplier & supportive customers like you, we produce thousands upon thousands of units monthly, bringing our cost down and gaining leverage to negotiate prices from our part suppliers.  Enjoy these pictures and videos.

Check out some of these videos of various stages of manufacturing the LNBFs we sell:

Want to see more videos? Check out our Youtube page here.


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WS International is a Wholesale Supplier and Distributer of DTH (Direct To Home) FTA, MPEGII, and DVB Equipment - WS International Blog

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