George Hardesty

Feb 172017
 

Example:  You need only 860-960 MHz GSM band but the antenna covers 800-960MHz:  One customer told us that using an antenna that includes 824-960 band allows too much interference, that comes from the low end of that band 824-860MHz.

Our recommended  solution is to add a filter in your system board (or AP board), and thereby enable use of an antenna that covers a wider band, such as 800-960MHz or 824-960MHz, as examples:  Because you will find many more antenna options that cover 800-960MHz or 824-960MHz than just 860-960MHz.

800-860MHz is a very close band to 860-960MHz frequency band and the antenna is a passive device which can’t filter; therefor, you need to have an active circuit to filter 800-860MHz frequency.

 Posted by at 9:17 am Antennas Tagged with:  No Responses »
Feb 122017
 
  • LTE frequency Bands
    • USA: 700 MHz band and
    • Global:  2600 MHz band
  • WiMax Frequency Bands:  2300 MHz / 2500 MHz / 2600 MHz
  • GSM Bands (US and Latin America): 824-894 and 1850.2 – 1909.8
GSM frequency bands

GSM Frequency Bands

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  • Bands 2 and 5 (shaded in blue) have been deployed in  the United States, Canada, the Caribbean and Latin America.
  • Bands 3 and 8 (shaded in yellow) have been deployed in Europe, the Middle East and Africa, Asia-Pacific.
  • All other bands have not been deployed commercially.
Oct 092016
 

We offer two options of thickness of cable for U.FL cablesMHF4 cables, and W.FL cables:

1.13mm mini-coaxial cable (50 Ohm): This is a very thin and flexible cable, with a black jacket. When connecting U.FL connector to a jack on a miniPCI card or board, sometimes the tight space requires the use of 1.13mm cable, because it is very thin and flexible: It is not always necessary to use 1.13mm cable, but on occasion it is necessary to use 1.13mm cable, to prevent the U.FL connector from popping off the U.FL jack.

LMR-100-equivalent cable-type: Equivalent or better than LMR100A: Cable is double-shielded, low-loss and very flexible/easily bendable coax with black jacket. The double-shielding is a major factor in the higher quality of this cable, which translates into lower loss/better performance. Has the same or better signal-loss-per-meter and flexibility as LMR100A, and less attenuation (signal loss) than RG174 and RG178. The higher quality of the cable of this antenna translates into lower loss/better performance. Cable is equivalent to LMR-100 in thickness.   Since the LMR-100 equivalent coax has lower signal loss:  If this cable works for you without the U.FL, MHF4 , or W.FL connectors popping off the jacks, then the thicker one is the better solution.  You can use a hot glue gun to secure the jack onto the PCB, in which case, of course, the thicker cable will not be a problem:  This is the best way.

We can make special orders with either LMR-100 equivalent (for lower signal loss) or 1.13mm cable, for better flexibility.

U.FL CONNECTORS

U.FL (Ultra-Miniature Coaxial Connector) is part of the UMCC (Ultra Miniature Coax Connectors) series by Hirose Electric Co Ltd. The U.FL series has become a standard in the wireless industry. It provides an extremely small mounting area weight. The series also offers high frequency performance and has a user friendly tactile lock feeling that ensures a reliable connection.

U.FL male right-angle connector mates with U.FL jack/cable-connector U.FL-LP-66, found on mini-PCI wireless cards such as: MikroTik, Ubiquiti, ZigBee radios such as XBee, and Intel PRO: This pigtail enables connection of an external antenna to a mini-PCI wireless card with a female HiRose/U.FL connector U.FL-LP-66 connector.

Data Alliance’s U.FL connectors are precision machined and gold-plated for low loss.

Lead-free and ROHS compliant: Our antenna cable products are ROHS compliant (connectors and cable).

UFL male and female connectors

If there is a U.FL jack on your PCB, it is a U.FL male.

Aug 042016
 

Data Alliance uses low-loss coaxial cable in all of our antenna cables, as opposed to the old standard, RG cable that is used in most other brands of antenna cables.

The term “low loss” antenna cables refers to the’ low attenuation (loss) over distance, of the coaxial cable used in the antenna cable, relative to a typical old standard, RG cable.   Low loss coaxial cable has far better shielding than typical RG style cable thus achieving better low loss characteristics.  Additionally, low loss coaxial cables use solid center conductors which offer lower attenuation than stranded conductors that are sometimes found on RG style cables. Low loss coaxial cables are typically used in WLAN, Cellular, PCS, ISM and many other wireless applications.

Signal Loss in Certain Coax Types for four most-used frequencies for WiFi and 4G (thinnest to thickest, left to right):

RG-174RG-174 Attenuation Per Foot:

  • at 900 MHz: 0.31447 db/ft
  • at 2.4 GHz: 0.60237 db/ft
  • at 3.4GHz: 0.76886 db/ft
  • at 5.1-5.8GHz: 1.1134 db/ft

RG-178RG178 Attenuation Per Foot:  (RG178: clear jacket over copper braid)

  • at 900 MHz: 0.55 db/ft
  • at 2.4 GHz: 0.89 db/ft
  • at 3.4GHz: 1.02 db/ft
  • at 5.1-5.8GHz: 1.38 db/ft

LMR-100LMR-100: Attenuation Per Foot in LMR100A Coax: (black jacket)

  • at 900 MHz: 0.23 db/ft
  • at 2.4 GHz: 0.39 db/ft
  • at 3.4GHz: 0.47 db/ft
  • at 5.1-5.8GHz: 0.643 db/ft
LMR100 attenuation

LMR100 attenuation at various frequencies 150MHz to 3000MHz:  100 meters

LMR-100 compared to RG316

LMR-100 has lower signal-loss than RG316

RG-58RGB-58 Attenuation Per Foot:

  • at 900 MHz: 0.1365 db/ft
  • at 2.4 GHz: 0.258 db/ft
  • at 3.4GHz: 0.328 db/ft
  • at 5.1-5.8GHz: 0.479 db/ft

LMR-200LMR-200: Attenuation Per Foot or meter in LMR-200 Coax:

  • at 900 MHz: 0.39 db/ft
  • at 2.4 GHz: 0.42 db/ meter
  • at 3.4GHz: 0.83 db/ft
  • at 5.1-5.8GHz: 0.108 db/ft

LMR-400LMR-400: Attenuation Per Foot in LMR400 Coax:

  • at 900 MHz: 0.228 db/ft
  • at 2.4 GHz: 0.391 db/ft
  • at 3.4GHz: 0.532 db/ft
  • at 5.1-5.8GHz: 0.641 db/ft

The attenuation rate per foot does not change with length of the cable:  i.e.,  attenuation at 10 feet is 10x the attenuation at one foot, etc.

Attenuation In Coax For Antenna Cables:   Signal strength is lost in the antenna cable:   It is best to have the shortest cable that will serve your needs.

As coaxial antenna cable transfers radio frequency (RF) power from one point to another, the power that enters it is degraded along the length of the RF cable, meaning less power reaches the remote than entered the RF cable. This loss of power in the coax cable is what is referred to as attenuation. The loss is defined in terms of decibels/unit length at a given frequency:

Coax used in Data Alliance’s antenna cables:  We use low loss antenna cables for superior connection quality.  Suited for indoor and outdoor use, our cables provide superior matching and loss values.  Both connectors are soldered, not crimped, for the best possible signal quality. 

Our shorter cables (less than two meters) we make with cable type equivalent to LMR100A or higher,  in quality and signal-loss per meter.  All of our cables of 2-meters or more are made from cable equivalent to LMR200 in quality and signal-loss per meter.  The higher quality of the cable of our cables translates into lower sigal loss / better performance. 

Our cables of 2-meters to 9-meters are made from cable-type equivalent to LMR200 in quality and signal-loss per meter.  Longer cables made from cable-type equivalent to LMR400 The higher quality of the cable of our cables translates into lower signal loss & better performance. 

SOLUTIONS FOR SIGNAL LOSS:  

The solution is to reduce the length of antenna cables or eliminate them altogether, if possible:  Bring the WiFi device as close as possible to the antenna.  

Use one of the following solutions:

Mar 172016
 
Hi Simon, I just wanted to say that I ordered a couple of SMA cables from you guys and I really enjoy the quality and craftsmanship!
I just got one today and I’m excited to get the other one later this week so I can finish my project. The quality of the cables really made me happy, so thanks. I find these days it’s hard to find vendors who make good products, so I really do thank you.
-Colin, Laguna Niguel, California
Jan 192016
 

Spatial diversity is another useful feature for operating in areas susceptible to the effects of multi-path interference. By providing spatial diversity, the radio’s internal circuitry can select between the two receive antennas for better wireless reception.

In the case of 802.11n or MIMO applications, two or more spatially or polarization diverse antennas are required for the radio to operate at its highest data rate.

 Posted by at 10:37 am Antennas, Antennas No Responses »
Jan 192016
 

Signals received at base station antennas are typically elliptically polarized in a way more like vertical polarization than horizontal polarization. This creates a common problem with dual polarized base station antennas (like the first generation of Ubiquiti dual-polarity antennas) since the vertically polarized antenna element generally maintains a stronger receive signal than the horizontally polarized antenna element.

This can be overcome by slanting the orthogonal polarized antenna elements to +/- 45 degrees. By slanting one of the antenna elements 45 degrees to the left and the other 45 degrees to the right, improved equality in received signal levels can be achieved.  This can help improve coverage in congested environments.

Another advantage to using these types of cross polarized antennas is in co-located wireless system installations. Since multiple antennas are used within the same facility or tower, this often creates interference issues among antennas which are usually vertically or horizontally polarized. Using 45 degree slanted cross polarized antennas on the client side as well on the base station side can greatly reduce interference and improve performance.

Ubiquiti’s AirFiber 5GHz Dish series uses 45-degree slant for improved noise immunity and Signal‑to‑Noise Ratio (SNR)

 

 Posted by at 10:35 am Antennas, Antennas No Responses »
Nov 292015
 

For all credit requests less than $15,000, the process is very simple.

  1. Request the one page Credit Application from Customer Service
  2. Complete the application.
  3. Email the form to Customer Service

Data Alliance Customer Service will be in touch with you shortly. You should expect an approval within 48 hours, depending on how quickly your references respond to our requests.

You can help speed the process along by calling your references and bank, alerting them that they will be receiving a trade reference request from Data Alliance and to please respond quickly.

Frequently Asked Questions

Q. What counts as a trade reference? A. Any trade credit account that has had activity in the past 12 months, whether it be an open account with supplier or even a Home Depot account.

Q. What if I don’t have a bank account? A. If you don’t have a current business banking relationship or bank account, any loan balance on a vehicle, equipment or building loan will work. Fill out the bank reference part of the form with the bank that holds your loan, including your loan reference number.

Q. What information do you ask my trade references? A. The only information we ask your trade references is to confirm the information you provided and whether or not your account is in good standing. That’s it.

Q. What bank information do you ask for? A. We will send your bank a form to verify that you are a customer in good standing. See the sample bank form later in this document. We won’t ask for any balances, types of accounts or anything specific.

Q. What does ‘good standing’ mean? A. It means that you are doing whatever it is that you agreed to do.

 Posted by at 10:59 pm Credit Terms No Responses »
Sep 122015
 

Summary of Terms and Conditions :

  • Customer must be a corporation or LLC with credit history (not a proprietorship. Partnerships will be considered).
  • Business customers that pass our credit evaluation qualify to begin with 30 day net terms.
  • Customers with a good payment track-record with us will have their terms increased to 60 and then 90 days to pay invoices.
  • Contact Customer Service for a credit application
  • Customers are required to pay their invoices within the term-limit that we set after approval, and adjust according to performance, with notification in writing, by email.
  • We can accommodate credit lines up to $200,000

Credit Requests Less Than $15,000: Details & FAQ

HELPING YOU BUILD YOUR BUSINESS

Establishing good credit is one of the most important things you can do to grow your business. Data Alliance understands how to partner with you to accomplish just that.

  • We grant easy credit to new or small businesses.  Just starting out? Small but growing? No problem. We’ll start you with a credit limit equal to 125% of your largest verifiable trade balance with any other outstanding creditor. No personal guaranty required, no extensive credit checking process that takes days and days to complete. All we need are 2 trade references and a bank reference – it’s just that simple.
  • We grow your credit line quickly if you pay on time:  Pay your invoices within terms, and we’ll automatically increase your credit limit to 25% more than your highest paid accounts receivable balance. And we’ll keep doing that automatically until your credit line reaches $20,000.  You don’t have to ask or make any special requests, just pay your bill on time and grow your credit automatically.
 Posted by at 5:02 pm Credit Terms No Responses »
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