Abstract: Base radios and communication apparatus (100) that include: a chassis (110); at least one power supply module (120) having a height that is substantially the height of a three rack unit chassis and having a width that is substantially one sixth the usable width of a nineteen inch rack; at least one fan kit module (130) having a first fan kit module dimension that is substantially the height of the power supply module and a second fan kit module dimension that is substantially five sixths the usable width of a nineteen inch rack; and at least one other module (140, 150) having a first module dimension that is substantially the second fan kit module dimension and having a corresponding second module dimension.

Abstract: A heat sink and component support assembly that includes a core structure (110). The core structure (110) includes: a central member (112) having first (114, 116) and second opposing sides; at least one heat dissipating surface (124, 126, 128) extending from at least one of the first opposing sides (114, 116); and first and second extension members (118, 120) positioned adjacent to each of the second opposing sides. The assembly may also include an airflow facilitating arrangement, such as a fan (184), positioned adjacent to the core structure (110) for further enhanced heat dissipating capabilities.

Abstract: This disclosure discusses a programmable frequency synthesizer arrangement having programming feedback capability used to avoid undesirable operation due to random hard and soft faults. The arrangement operates by supplying appropriate programming information, receiving the same, subject to random hard or soft faults, and, in response, directing the operation of a frequency synthesizer (10). The feedback capability is accomplished by generating a feedback signal (35, 36) indicative of the programming information as applied to the frequency synthesizer, generating a reference signal representative of the appropriate programming information, comparing the two signals, and blocking undesirable operation of the frequency synthesizer if the comparison indicates the occurrence of a random hard or soft fault. Further disclosed is a wireless communications transceiver with the programmable frequency synthesizer arrangement.

Abstract: A variable characteristic impedance microstrip resonator for use in a tunable oscillator circuit, the resonator having relatively high characteristic impedance near its driven end to maximize tuning range and relatively low characteristic impedance near its opposite end to minimize losses and thus optimize sideband noise performance.