Spectrum Engineering Online
Spectrum Engineering is now online! ATDI's new RF network planning web application adds another dimension to the classic ATDI product line of desktop based software solutions. Spectrum-E is ATDI's tablet friendly web application for planning telecommunication networks and performing frequency nomination analyses for government and commercial networks operating in the MF through UHF bands. Customers can select from different templates specific to their technology of interest. Custom templates can be prepared per request. By connecting to ATDI's dedicated Data Center, ATDI customers can perform various engineering simulations such as a multi-station coverage analysis over 5 meter or 10 meter terrain and clutter, frequency nomination analysis, interference studies all within a minute each! Below are some examples of the features available in Spectrum-E for different radio technologies.


For further information on Spectrum-E and its capabilities please contact us



Radio Frequency network planning web application based on atdi's flagship planning tool

Spectrum-E offers RF network planning via a web application. 

Spectrum-E is a tablet-friendly web application for planning radiocommunication networks and performing frequency analysis in the MF to UHF bands. Users can select different templates specific to the technology they are using. Customised templates can be prepared on request depending on the types of analysis required.

Spectrum-E offers enables engineers to plan and model in the field or remotely. Spectrum-E uses a HTML5-capable web browser (on tablet, computer or smartphone) and an internet connection (WiFi, cellular or LAN connection). It produces fast and accurate results for almost any environment.

Spectrum-E offers a direct connection to a dedicated ATDI data centre, where users can perform a variety of engineering simulations including multi-station composite coverage analysis (using high-resolution terrain and clutter), frequency nomination analysis and interference studies - all at the touch of a button.


Web-applications offer specific advantages over local software applications:
• Zero footprint on computer resources (i.e. SSL access)
• Cross-platform compatibility including agnostic operating-systems and compatible with all browsers (for tablet, PC or smartphone)
• Able to distribute information to large groups instantly from database (multi-resolution map databases, relational databases, equipment databases)
• Customization and integration friendly. Allowing work flow automation with dedicated interfaces
• Maintenance available as well as upgrades.

Spectrum-E is compatible with any HTML5 web browser (inc Google Chrome, Mozilla Firefox v9+, IE v9+, Safari, Opera). ATDI recommends Google Chrome for the best results. Spectrum-E is a tablet-friendly web application.


Spectrum-E can be licensed in several ways:

• Subscription: allowing customers to access hosted licenses via ATDI's servers
• Local Area Network (LAN): Spectrum-E a can installed on the end-users' internal network
• Standalone Computer: Spectrum-E can be installed on an individual users' computer.



• Automated import from various databases
• Talk-out and talk-in coverage analysis using multiple propagation models including Longley-Rice, Okumura-Hata-Davidson and ITU-R P.1546
• Automated service area reliability, degradation analysis and reporting between proposed stations and co-and adjacent channel incumbent stations 
• Automated frequency plan ranking and availability for frequency nomination purposes.



• Automated import from various databases
• Service area contour analysis for AM broadcast stations in line with ITU-R P.1147-4 (considering day/night coverage)
• Propagation analysis of digital signals in the VHF/UHF bands using ITU-R P.1546-4 and ITU-R P.1812-2
• Automated interference analysis and reporting between proposed and incumbent FM broadcast stations in line with ITU-R BS.412-9
• Automated frequency plan ranking and availability for frequency nomination purposes
• Microwave
• Point-to-point link reliability and path profile reporting using ITU-R P.530-12
• Automated interference analysis and reporting between proposed and incumbent microwave links per TSB.10-F
• Air navigation systems
• Radar line-of-sight coverage according to ITU-R P.525-2
• Minimum Safe Distance Clearance Contour generation for navigational aids (VOR, DME, TACAN)
• Siting analysis for wind turbine proposals
• Worst-case Fresnel Zone analysis for microwave links.


• Skywave and groundwave propagation simulation based on ITU-R P.533-10 and ITU-R P.368-9
• Point-to-point skywave signal-to-noise plots
• Percentage of day covered coverage prediction type


• Customizable 2D prediction displays
• 3D terrain view with vector and prediction overlay
• Percentage coverage analysis
• SHP vector import and coverage carving
• Downlink coverage overlap reporting
• Report template editing features
• Skywave and Groundwave propagation simulation based on ITU-R P.533-10 and ITU-R P.368-9.


ATDI study: HF Analysis in Spectrum-E

ATDI, Inc. recently completed a HF (high frequency) analysis for the United States Coast Guard (USCG), analyzing the coverage capabilities of the existing US Customs and Border Patrol's (CBP) Customs Over The Horizon Enforcement Network (COTHEN) along with existing USCG HF sites nominated for potential inclusion in the existing COTHEN system. Using the most recent version of ITU propagation model 533 (Fig. 1), method for the prediction of the performance of HF circuits, the ATDI team was able to effectively model both existing and potential sites in the COTHEN network for coverage of expansive areas both on- and off-shore.


Figure 1: Example of Point-to-Point skywave propagation chart using ITU-R P.533 HF model

Through the use of point-to-point and point-to-area skywave coverage functions, the ATDI team was able to recommend an updated COTHEN layout designed to expand network coverage along with the bolstering of existing coverage reliability. The analysis considered the many complex characteristics of HF radio propagation including, but not limited to: seasonal variations, daytime/nighttime variations, sunspot numbers, receiver noise environments, required signal-to-noise values, distinctive antenna patterns with prominent vertical nulls, etc.


Figure 2: Predicted HF skywave coverage for hypothetical network (signal-to-noise ratio view)

ATDI, Inc. also recently implemented a bevy of new high frequency (HF) functions into the Spectrum-E web application for the modeling of HF radio propagation. The added functions allow for both point-to-point and point-to-area analysis and the production of visual chart- and map-based result outputs. The ability to model multiple frequencies for one object or a network allows for simplified analysis of ALE (automatic link establishment) networks that frequency-hop through a frequency set, communicating on the most advantageous frequency at any one time. Map-based outputs also allow the user to fine-tune their results for presentation, allowing for both signal-to-noise based plots (Fig. 2) along with percentage of time of day plots (Fig. 3).


Figure 3: Predicted HF skywave coverage for hypothetical network (percentage of time of day view)


Figure 4: Vertical and horizontal polar plots of HF Antenna in Spectrum-E HF module

ATDI's Spectrum-E Featured in Public Safety Communications magazine

ATDI was recently featured in the August issue of Public Safety Communications magazine. The article highlights Spectrum-E as APCO AFC's advisors RF engineering tool for FCC Part 90 compliant propagation analysis and frequency coordination. "Spectrum-E is now the official tool used by APCO advisors to perform a variety of studies essential to supporting public safety communications networks on a local, state and national level."


FCC R-6602 derated contour analysis performed in Spectrum-E

The details of ATDI's contract delivery of the Spectrum-E web application to APCO International are featured in the recent article, Spectrum Engineering Goes Online. Some of the article highlights also include the applications's customization, user friendliness, efficiency, and functionality. "The collaboration with APCO has been exceptional, and the resulting platform reflects what best-in-class partners achieve when their efforts are pooled together. This step forward for our organizations and the RF engineering field in general promises great opportunities for many years to come," says Pierre Missud, CEO of ATDI Inc.

* Read the full article here: Public Safety Communications: Spectrum Engineering Goes Online.*


Multi-station UHF coverage for LMR relays along a railway line performed on an iPad with Spectrum-E.
* Reprinted from August 2012 Public Safety Communications with permission of APCO International. For membership and subscription information, visit www.apcointl.org ; for information about FCC license management, visit http://www.apcointl.org/spectrum-management.html.

Spectrum-E presentation