George Hardesty

Mar 212018

1. Please give us the spec of the IP camera.

2. Please check if the IP camera supports standard PoE(802.3at/af) or passive PoE.?

3. if it supports standard PoE, it needs to use the 48V power adapter (Note: need to check the power pin of the RJ-45 is Pin4,5,7,8 or 1,2,3,6; our APOE03 use the pin4,5,7,8)

4. If it supports passive PoE, it needs to check the power pin of the RJ-45 is Pin 4,5,7,8 or 1,2,3,6 ;our APOE03 use the pin 4,5,7,8.

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 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: This is a low-loss coax option for U.FL but not for MHF4 or W.FL.   LMR100  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 LMR100, 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 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 of U.FL cables with either LMR-100 equivalent (for lower signal loss) or 1.13mm cable, for better flexibility.

MHF4 cables, and W.FL cables cables can only be made with the very thin coaxes such as 1.13.   MHF4 is not compatible with LMR100 and RG178.


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).

Attenuation of 1.13 Coax for Microconnectors

Attenuation of 1.13 Coax for Microconnectors

UFL to SMA cable diagram

U.FL to SMA Cable diagram

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 double-shielded 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, and has a single layer of shielding.

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. LMR-100 structure, showing two layers of shielding.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   The LMR-series coax is rated for outdoor use and are also suitable for indoor use

Among the coax types below, the RG-series is the lowest quality and thinnest (RG174 & RG178, RG58).  LMR100 & LMR200 tabs below include detailed specifications.


LMR100 attenuation

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

LMR-100 Specifications & Attenuation (Signal Loss):
No. in diagram above: Item Structure Material Color
1 Inner conductor 0.45±0.02mm Bare copper Yellow
2 Insulation 1.50±0.10mm LDPE Nature
3 Folia 1.60±0.10mm Aluminum foil Silver gray
4 Wire braid 80*0.10mm Tinned copper Silver gray
5 Jacket 2.90±0.10mm PVC Black
Attenuation (Signal Loss) at 20℃ (Max.) 150MHz dB/100m 32.3
200MHz dB/100m 35.6
400MHz dB/100m 49.3
1000MHz dB/100m 80.6
1500MHz dB/100m 98.7
2000MHz dB/100m 115.5
2500MHz dB/100m 130.6
3000MHz dB/100m 142.4
Electrical Physical and properties of product
Item Unit Value
Capacitance pF/m 100± 5
Impedance W 50± 2
Velocity ratio % 66
Bent radius min mm 15
Max voltage VMS 1500
Max Frequency MHz 3000
Temperature scope  -20 ~ +80
LMR-100 compared to RG316

LMR-100 has lower signal-loss than RG316

LMR-100 coaxial cable is used in short antenna cables (usually less than 7FT)
Attenuation Per Foot in LMR100 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


LMR-200 Specifications & Attenuation (Signal Loss):
No. in diagram above: Item Structure Material Color
1 Inner conductor 1.12±0.02mm Bare copper Yellow
2 Insulation 2.95±0.10mm Foam PE White
3 Folia 3.07mm Aluminum foil Silver gray
4 Wire braid 96*0.12mm Tinned copper Silver gray
5 Jacket 5.00±0.10mm PVC Black
Attenuation (Signal Loss) at 20C (Max.) 200MHz dB/100m 16
400MHz dB/100m 24
900MHz dB/100m 33
1500MHz dB/100m 43
1800MHz dB/100m 47
2500MHz dB/100m 56
Electrical Physical and properties of product
Item Unit Value
Capacitance pF/m 81± 5
Impedance W 50± 2
Velocity ratio % 86
Bent radius mm 25
Max voltage VMS 1500
Max Frequency MHz 3000
Temperature scope  -20 ~ +80

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

Signal Loss / Attenuation: All aboutThe 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 LMR100 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. 


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:

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

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

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 »
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