The Telewave TPRC-4504-1 is a 8" diameter, 1/4-wavelength Pass-Rejectcavities with an adjustable coupling loop and tuning capacitor. Pass-Reject cavities reject all frequencies outside a narrow passband,with a tunable notch for additional protection with closespacing. These cavities are commonly used to reduce transmittersideband noise, and protect receivers againstdesensitization.
TPRC-4504 cavities cover 400-512 MHz. All cavities are tuned to specified frequencies prior to shipping, and no further adjustments should be required. The positive locking mechanism allows for quick field re-tuning if frequency changes become necessary. Excellent frequency stability is achieved by the use of a specially machined compensator and Invar rod.
The pass and reject frequencies are temperature stable from -30°C to +70°C. Telewave Ground Loop technology places the center conductor of each coupling loop at DC ground potential for lightning protection and noise reduction. Heavy duty materials are used throughout each cavity to insure high performance and long life. Cavity top plates are machined from 1/4-inch aluminum, and are heliarc welded to the cavity body at the high current point for improved conductivity and strength. This allows Telewave cavities to handle up to 350 watts, depending on insertion loss.
Rigid foam inserts support the tuner assembly allowing vertical or horizontal mounting. Similar metals and alodined aluminum help prevent galvanic corrosion. Silver plated tuners and beryllium copper finger stock provide noncorrosive low loss contact, and ensure reliable, long-term performance.