The Telewave TWPC-1505-3 are 1/4-wavelength, high "Q" bandpass cavity filters with superior selectivity. Bandpass cavities reject all frequencies outside a narrow pass band. These cavities reduce transmitter sideband noise and also protect receivers against desensitization.
The TWPC-1505-3 features calibrated adjustable coupling and insertion loss can be easily set from 0.5 dB to 2 dB or more to improve selectivity. This allows cavity response to be optimized for any operating environment. At densely populated sites, the TWPC-1505-3 cavity filters provide greater selectivity with minimum insertion loss. Multiple cavities can also provide a wider passband when required. Mounting rails are provided for all multiple-cavity filters.
Excellent frequency stability is achieved by the use of a specially machined compensator and Invar rod. The pass frequency is 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 non-corrosive low loss contact, and ensure reliable, long-term performance.
Manufactured by Telewave
| Insertion loss (adjustable) |
1.5 to 6.0 dB |
|
Attenuation |
See figure |
|
Maximum dimensions with tuners
extended in. (cm) |
5.25 x 19 x 28 (13 x 48 x 71) |
|
Net weight lbs. (kg) |
15 (7) |
|
Shipping weight lbs. (kg) |
18 (8.1) |
|
Tuning frequency range |
148-174 MHz (factory tuned) |
|
Nominal impedance |
50 ohms |
|
VSWR at resonance (max) |
1.5:1 |
|
Input power (max) vs. insertion loss |
0.5 dB - 350 watts, 1 dB - 250 watts,
2 dB - 150 watts |
|
Temperature range |
-30°C to +70°C |
|
Cavity electrical length |
1/4 wavelength |
|
Outer conductor, end plates |
6061-T6 aluminum |
|
Inner conductor, coupling loops |
Silver plated copper |
|
Tuning rod |
Invar |
|
Contactors, fingerstock |
Beryllium copper |
|
Cavity dimensions (Diam. x H) in. (cm) |
5 x 23.5 (13 x 60) |
|
Connectors |
N female |
|
Finish |
Gray acrylic enamel |
