| Date | Link |
|---|---|
| Feb 28, 2006 | Board Layout Software |
| David - This is the software that Professor Greco used. The free version is limited to 3x4.2 inch boards. Probably not useful for this group. |
|
| Feb 19, 2006 | Tips on Controlling Clock Skew Trunk Line System |
| Sent by Edward. Edward Kimotho - |
|
| Jan 31, 2006 | EMS radio nearly ready |
| Sent by Danielle. David Glasser - Story about radio intergration in Northhampton County, home to Lafayette. |
|
| Jan 31, 2006 | 12 VDC to 120 VAC inverter |
| Laura - The link for 12 VDC to 120 VAC inverter. I haven't looked at other
manufacturer's websites yet. PPL buys from Nova so that's why I looked htere
first. |
|
| Jan 30, 2006 | Lucid Spec |
| Ed - I am sure there are many other programs like this out there, but u can have a
look at this one to draw up some GUI stuff before actual designing. |
|
| Jan 29, 2006 |
MAXIM home page Analog Switch main page 4581 data sheet |
| Danielle - I found this particular analog switch at MAXIM. They had A LOT of analog
switches. I picked the 4581 just because it was the first one i saw that was
an 8:1 mux. I'm sure there are other parts here or at other companies that
would be just as well or better suited for what we need. |
|
| Jan 25, 2006 | Asterisk |
| Zach - Open Source PBX System |
|
| Jan 24, 2006 | Digital Acoustics |
| Zach - Convert Audio to TCP/IP | |
| Date | Link |
|---|---|
| April 25, 2006 | Ribbon Cables Link 1 Ribbon Cables Link 2 Ribbon Cables Link 3 Ribbon Cables Link 4 Ribbon Cables Link 5 |
| Dr. Gum - Ribbon Cable Stuff |
|
| April 25th | AN-42028 SCSI Technology Design Termination |
| Dr. Gum - Terminations |
|
| April 25th | Capacitor Data |
| Dr. Gum - Decoupling Caps |
|
| April 14, 2006 | Radio failure impairs storm response |
| Dr. Gum |
|
| April 14th | The Errors of 9/11 Have City at Work On Radio System Testimony of Gino P. Menchini Chief Information Officer, City of New York Commissioner, Department of Information Technology and Telecommunications |
| Dr. Gum |
|
| April 10, 2006 | Level Shifters |
| Dr. Gum |
|
| April 4, 2006 | Digial Audio Sampling Theory |
| Dr. Gum |
|
| Mar 30, 2006 | Audio Caps |
| Dr. Gum - Audio caps |
|
| Mar 15, 2006 | Solutions for Communications Interoperability |
| Dr. Jemison - Cisco Solution |
|
| Mar 09, 2006 | VoIP and Amateur Radio Introducing EchoLink Voice over Internet Protocol (VoIP) Accessibility Equipment Options For VOIP Communication Get Your VOIP Solution Now |
| Jeffery W Gum - VOIP |
|
| Mar 08, 2006 | DC/DC Filtering |
| Jeffery W Gum - Astron Power Supplies |
|
| Mar 08, 2006 | Link 1 Link 2 |
| Jeffery W Gum - Phone Signal Level |
|
| Mar 08, 2006 | More Battery Stuff Battery Stuff |
| Jeffery W Gum - Battery Stuff |
|
| Mar 07, 2006 | Astron Power Supplies |
| Jeffery W Gum - Astron Power Supplies |
|
| Feb 28, 2006 | Logic Family Choices The basics of integrated circuits |
| Feb 28, 2006 | 19" Rack Mount Equipment |
| David Glasser - General Rack information |
|
| Feb 27, 2006 | Introduction to GAL Devices |
| Yang Feng Zheng - General specs of different GAL devices. |
|
| Feb 21, 2006 | Choosing a Charger Site Battery Backup Systems Battery Storage Capacity Ratings AC-DC Power Supplies (100-5000W) PowerStream Technology |
| Feb 14, 2006 | Xilinx Picoblaze Microcontroller PicoBlaze for Spartan-3, Virtex-4, Virtex-II, and Virtex-II Pro FPGAs |
| David Glasser - Microcontroller core for FPGA. |
|
| Feb 13, 2006 | Telephone line audio interface circuits |
| Jeffrey W Gum - This has a number of hobby circuits that take 2-wire to 4-wire as we
have discussed. |
|
| Feb 13, 2006 | Analog Telephone Adaptor Reference Design Kit |
| Hugh King - |
|
| Feb 13, 2006 |
KIT,REMOTE CONTROL BY PHONE Remote Control By Telephone (Specification) |
| Hugh King - |
|
| Feb 7, 2006 | VHF/800MHz interoperability |
| Scott Curry - This article describes how to create a translator (repeater) between two
radios. The specific example given is connecting a VHF radio with some simple
circuitry to a 800MHz radio so that they can repeat or relay the information
on the other radio. It works both ways and is a very simple device. This can
be used for directly connecting devices together, it does not help our project
too much because it has no way to handle changing talk groups or repeating on
more than two radios. There are two links at the end that give examples of
similar commercial systems. |
|
| Feb 7, 2006 | The Definitive Guide to the 16 pin MaxTrac and Radius Option Connector |
| John Bayard - |
|
| Jan 30, 2006 | Police, deputies unite via radio |
| David Glasser - A success story of two agency's talking to each other on different radio systems. No technical details. |
|
| Jan 27, 2006 | Linux FRS Radio Control |
| John Bayard - This article explains how we can control a particular low-level radio,
including controling the pushbutton, remotely from a Linux program. Includes
diagrams, parts needed, and soldering technique.
The way talks are going now, with our design plan and such, I don't think this
article will help us at all. Thanks, email me if you have any questions! |
|
| Jan 27, 2006 | Motorcycle Leather, Motorcycle Helmets, Motorcycle Apparel, Motorcycle Gear!! Everything you need on a motorcycle ride! |
| Laura Fredley - The Air Rider Add-A-Radio Interface allows you to add a hand-held CB radio,
GMRS radio, FRS radio, or ham radio to a motorcycle and be fully integrated
into your bike's onboard intercom and radio system. This unit is designed to
work on motorcycles that already have headset hookups for their AM/FM radios
and intercom systems. On the end of the cable is a standard 2.5 mono audio
plug.
Price: $199.99 |
|
| Jan 27, 2006 | Telephone line audio interface circuits |
| Scott Curry - This article is basically everything you want to know about land line based
telephones. It talks about how the phones themselves work as well as how the
data is transmitted over the lines. It also talks about different ways of
interfacing the phones onto the networks.
I don't think that this article is very helpful to our project because I feel
that it is looking at telephone communications at a lower level then we'd ever
need to since we are just planning on using the audio input and output
adapters on the devices. If we need to tap into land line based phones or
need to see how they operate to apply it to another technology, this article
would be helpful. |
|
| Jan 25, 2006 | Vehicle Repeater System |
| Amanda Driscoll - Existing vehicle repeater systems - handheld radio becomes a wireless remote
speaker microphone for the mobile radio in the vehicle. |
|
| Jan 25, 2006 | What Is a Methodology? |
| Sherisse Hatcher - The article I read was about methodolgy for designing software. It discuss
the approaches that have been taken to designing software from the 1960's to
the 1970'and ends with a discussion of object oriented software design. This
article will be useful if or when we decide to develop software for the
project. |
|
| Jan 25, 2006 | On the Criteria To Be Used in Decomposing Systems into Modules |
| Tricia Indoe - This Article was about splitting designs into modules. The benefits of splitting into modules are development time, product flexibility, and
comprehensibility. Also, different modules can be designed without the actual
knowledge of the design of the other modules and each module can be replaced
without replacing the whole system. The article gives two ex&le of how one
project can be split up into different modules. |
|
| Jan 25, 2006 | Prototyping a design? |
| Edward Kimotho - Prototyping a Design
This article discusses the various design methodologies that are used out
there. This is a forum where one user discusses the design methodology that he
used and the subsequent problems he encountered. Then he discussed another
methodology that is a workaround for the problems that he encountered.
There were no defined requirements document at the onset i.e. the requirement
were not fully fleshed out. Furthermore, the requirements changed over time.
As a result, the design that was implemented was inadequate; some of the
modules were thrown away and others had to be incorporated.
Due to this problem, the designer elected to design with as little detail as
possible and would wait until all requirements were finalized before finishing
the design with all the details, tests and documentation.
Summary
The requirements change over time and your designs have to allow for these
changes. As Brooks said, "Plan to throw one away. You will do that, anyway". |
|
| Jan 23, 2006 | ECE 492 - 2004 |
| An ECE 492 website from long ago. |
|
| Jan 23, 2006 | Interoperability plan now a royal mess |
| Hugh King - A similar system in Canada did not meet the customer's approval. Reasons were
mostly for the lack of coverage but also for busy talk groups, and radios at
base stations not being completely powered up. |
|
| Jan 23, 2006 | A layman's guide to Interoperability |
| Marc London |
|
| Jan 22, 2006 | XEM3001 - Xilinx Spartan-3 Experimentation Module |
| David Glasser - Xilinx Spartan-3 Experimentation Module. Easy link to computer, lots of I/O ports.
Comes with driver for the computer and some APIs to make it easy to build a GUI. Seems like a good choice. Costs 200 dollars. |
|
| Jan 11, 2006 | Technical Evaluation TRP 1000 and ACU 1000 |
| Zachary Silverman - This article is a 51 page document that describes how the ACU-1000 unit works. Below is an expert from the articles executive summary section:
The ACU-1000 is designed to allow wireless communication systems to be combined at a
common denominator, namely the audio base band. Thus, radios that operates within
different parts of the radio spectrum, use different modulation and access techniques, or
use analog versus digital encoding can interoperate. This is accomplished by using the
received audio from one radio system as the source audio for one or more transmitters of
differing technologies. That is, through matrix capabilities the ACU-1000 can apply the
audio to a series of radio transmitter inputs. Simultaneously, either one path can be
created between two or more radios or several paths can be configured between sets of
radios.
----- Executive Summary, ADVANCED GENERATION OF INTEROPERABILITY
FOR LAW ENFORCEMENT, 8/25/00 page 1 |
|
| Jan 11, 2006 | Guide Radio Comm Strategy and Products |
| Yang Feng Zheng -
This document mainly focus on the radio communications interoperability, it describes three different strategies and characterize the products that are available to implement these strategies. The strategies described in this document are:
1. Same Radio System: Create one radio system that provides communications for multiple agencies. 1. Swap radios: provides interoperability on a temporary basis. (pg.3) 2. Shared system: a permanent interoperability solution. (pg.4) 3. Commercial services: includes SMR, LLMR and MSS. (pg.5) 2. Common Frequencies: Establish a common frequency and protocol so that transmissions from a subscriber on one radio system can be received by subscribers on a different radio system. 1. Common frequency/channels: program radio belonging to different radio systems to operate on a common channel. (pg.6) 2. Multimode radio: design to provide interoperability by providing capability to operate on multiple frequencies. (pg.6) 3. System to System Gateway: Deploy a gateway device that establishes an interface between radio systems by receiving a transmission from one radio system and rebroadcast it on another radio system. 1. Console patch: patch together two or more radio signals at a communication or dispatch center. (pg.9) 2. Audio baseband switch: extract audio from a radio, then switches the audio to another radio and transmits the audio on a different radio system. (pg.13) 3. Multi-system controller: controlled by sophisticated computer operated network controllers, compatible stand-alone system are linked together to create one large system. (pg.23) This document also briefly talked about voice over IP, and references to different interoperability products. |
|