George Hardesty

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.

LMR-100

LMR100 attenuation

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

LMR-100 Specifications & Attenuation (Signal Loss):
LMR100-Structure-Diagram
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

LMR-200 Specifications & Attenuation (Signal Loss):
LMR100-Structure-Diagram
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. 

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:

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 a useful feature for overcoming 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 »
May 142015
 

RF connectors’ gender is not as you would expect, due to these factors:

  • Gender of threaded connectors is referring to the pins inside–not the threads.
  • Reverse polarization (“RP”) complicates the determination of gender:  See details below about Reverse Polarization

Connectors with “RP” in the name are further complicated by the “reverse polarization” (RP):

  • The pins are female when they appear to be male, and vice versa.
  • If the documentation refers to the connector as “reverse ____”:
  • This is the same as RP-____ (e.g,  “reverse SMA” = RP-SMA)

strong>Details about Reverse Polarity (RP) / Reverse Gender Connectors and Adapters

  • Reverse Polarity/Reverse Gender connectors satisfy FCC Regulation 15 by switching dielectrics and pins/contacts between genders.
  • For example, a Reverse Gender Male consists of a male body, however, the dielectric and contact are female.
  • Basically, an RP female will look like a standard male, and an RP male will look like a standard female. Reverse Polarity connectors and adapters will not mate with standard coaxial connectors.  To attempt to do so will damage the connector.
  • All of our cables with RP-SMA female have a bulkhead (nut and washer).  They will will pass through an exterior wall covered in sheet metal and will seal out weather and survive extreme temperatures.

N-Connector:  The N type of connector is available in threaded and slip on versions and offers a bandwidth of upto 11 GHz. Such connectors are usually used with smaller cables such as RG-225. These connectors are used mainly with coaxial type of cables that are designed to provide distortion free signals. N type connectors are available in right angled models that facilitate their use at cramped locations in order to let the WiFi antennas remain vertical.

BNC and TNC:  BNC or Bayonet Neill-Concelman connector is a locking connector. These connectors twist and lock onto the mounting post unlike many other connectors that press or thread onto it. Such connectors are used in situations where quick disconnect capabilities are required. TNC or Threaded Neill-Concelman version uses threads instead of the locking mechanism.

MCX:  They are smaller in diameter by 30 percent when compared to SMA coaxial connectors. Such a size enables further miniaturization of the hardware of the WiFi network. They are designed to press fit into the post on the router. They are mainly used with antenna cabling of smaller diameters.

May 092015
 

The speed/throughput of an Ethernet Cable connection is better by a multiple of as much as 4X, if the RG45 connections have 50 Micron Gold Plating, as compared to standard metal contacts.

Gold is a much better conductor than any other common metal, and so the amount of signal loss is far less using gold, compared to cheaper metals.

Cheap keystone jacks and mass-produced cables and  often have no Gold Plating in the contacts. The efficiency of these network cables is as low as 20% of a similar cable with 50-micron gold plating (and otherwise constructed of the same materials).

All of Data Alliance’s ethernet cables pass the Fluke test, and are produced with the finest materials, including RJ45 Plugs with minimum of 50 Microns of Gold Plating.  Data Alliance provides CAT5e and CAT6 and CAT6a patch and crossover cables for all networking aplications in 9 colors.

Why 50-Micron Gold Plating is Important

  • Connectors maintain the signal connection between the cable and the RJ45 jack or port.
  • As time passes, the connectors are exposed to corrosive conditions such as moisture and humidity: This results in a loss of signal quality.
  • More corrosion = lower quality

Gold is:

  • Highly durable
  • Highly conductive
  • Non-corrosive

The thickness of the gold plating affects the lifespan of the connection

  • The thinnest plating is called “flash plating”
  • The amount of gold plating on connectors is measured in microns
  • 50 microns ensures a stable, high-speed connection, that will last for many years
May 032015
 

“Rebox” product is new, physically undamaged and complete product with full factory warranty, but which arrived at our warehouse in a damaged carton, and therefore does not meet Data Alliance’s quality standards to be sold as new. It has been repackaged in a generic carton and discounted.

Data Alliance’s part number will end with REBOX after the SKU, signifying a ReBox product.

Special Terms and Conditions:

Because Rebox product has been discounted, special terms and conditions apply:  Data Alliance cannot accept any return of a ReBox product unless it is Defective On Arrival (DOA). In that case, standard DOA return policies apply, however a replacement can only be made if another ReBox unit of the same part number is available. Data Alliance will not replace a ReBox product with a new product at the same discounted price.

Orderable quantity is restricted to inventory on hand.

Apr 092015
 

Optimization of the link involves trying different settings of channel sizes and power:

  1. Long links:  For links over 10 miles / 22km:  Smaller channel size  20MHz is almost certainly going to work best on a link of this distance.  You should try 20MHz and then compare to 40MHz to compare the throughput with each size.
  2. Short links can use a wider channel size: 40 to 80 MHz, to get more throughput (as long as there is not too much interference).  Experiment with the channel size and see which one gives you the most throughput.
  3. Power level:  Adjust the power to see if you get more throughput by adjusting up and down
Alignment:  Optimize the alignment by making very small changes right and left, up and down and watching the reaction of the throughput.
 Posted by at 10:46 am Mimosa Backhauls Tagged with:  No Responses »
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