Month of July 2002 - Page Number 7

Showing 61 - 70 of 374 from July 2002
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  1. 61.
    Conventional two-way radios have beltclips to attach to belts worn by radio users. Often, removing such radios from the belts can be difficult because these beltclips typically have hooks at the bottom to prevent easy disengaging. Described here is a rotation- al beltclip that does not require any pressing or pulling...
    IPCOM000008957D | Original Publication Date: 1999-Jan-01
  2. 62.
    Power slumping of a power amplifier (PA) on portable radios is a problem that occurs even with the use of either a Power Sense or Current Sense ALC circuitry. Such power slumping is due to the PA heating up with continuous keying of a radio. A sensing schottky diode circuit is proposed to com- pensate for this drop...
    IPCOM000008956D | Original Publication Date: 1999-Jan-01
  3. 63.
    Tnmked communication system allows for various types of communications: group calls, private calls, phone interconnect calls etc. For any call, the Tnmking Central Controller allocates an RF repeater as "voice channel", to receive the transmitting radio, and to retransmit it to the receiving party. In wide area...
    IPCOM000008955D | Original Publication Date: 1999-Jan-01
  4. 64.
    A method of alpha compression is derived from seven different data types which when combined pro- duce excellent text compression for many different lan- guages.
    IPCOM000008954D | Original Publication Date: 1999-Jan-01
  5. 65.
    Currently, there is no effective way to inform a calling party that a pager is busy and is therefore unable to return a call to the calling party. Tbis option provides an additional function to two-way paging. When selected, such an option enables the pager user to convey to calling parties that he/she is busy.
    IPCOM000008953D | Original Publication Date: 1999-Jan-01
  6. 66.
    Micro cellular communication system sites are base sites with limited coverage range that needs to be designed in a way to allow the site to have a min- imal impact on the location. In addition to small size of the electrical enclosure the site equipment must be designed without fans for active ah-cooling. These micro...
    IPCOM000008952D | Original Publication Date: 1999-Jan-01
  7. 67.
    Roaming pagers can operate over different coun- tries or time zones. The uniqueness of time stamp- ing is in accordance with such countries and time zones. The time and date of a received page are based on the country or time zone in which the user resides. This can cause confusion to the user when moving across...
    IPCOM000008951D | Original Publication Date: 1999-Jan-01
  8. 68.
    This paper describes a method of virtually elimi- nating test failures due to interference in systems where multiple radios are tested at the same time on the same or similar transmit and receive frequencies.
    IPCOM000008950D | Original Publication Date: 1999-Jan-01
  9. 69.
    In packet based wireless LAN systems operating at microwave radio frequencies, the actual rate of successfully decoding any particular packet at a single receiver may be quite low. This is due to poor attenuation and multipath characteristics of the employed microwave radio channels. This performance is particularly...
    IPCOM000008949D | Original Publication Date: 2002-Jul-25
  10. 70.
    Ball grid arrays (BGAs) that are packaged for commercial applications can be ceramic capped or globbed. Each of these BGAs typically has a sub- strate that supports multiple circuit layers. Conventionally, vias for connecting these layers are located on the sides of the substrate and are masked, therefore testing I...
    IPCOM000008948D | Original Publication Date: 1999-Jan-01