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Type "C"
This range of highly selective quarter wave co-axial resonators will improve the RF selectivity of receivers and reduce the transmission of harmonics and spurious radiation from transmitters. The physically larger cavity resonators provide greater selectivity because of their higher "Q".
Electrical Data:
A table of performance of the bandpass cavity filters is included for reference. All combinations have a minimum power capability of 150 watts, a temperature range of -10°C to +60°C, and a VSWR at resonance of 1.3/1 or better.
Operating Mode:
The standard range of resonators are 1/4 lambda re-entrant mode resonators, except for models with suffix 'X' which are 3/4 lambda.
Coupling:
Loops are factory preset to 1 dB insertion loss but may be varied from 0.5 dB to 2 dB insertion loss, if required. Note that selectivity will vary with a change of coupling.
Stability:
Positive locking of the cavity to the tuned frequency, and the careful selection of materials and finishes ensures long term stability. | | | |
| The cavity outer conductor is aluminium with a fully welded heavy aluminium top plate, the inner conductor is silver plated brass and copper, and the tuning rod is invar. Tuning is smooth with minimum backlash. The connectors are "N" type female mounted on adjustable coupling loop carrier plates. The finish is grey enamel paint over chromate passivated aluminium body. | | | |
| Brackets for wall or rack mounting may be supplied with all models of cavity resonators as an optional extra. | | |
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| MODEL NO |
C9-4X |
| FREQUENCY RANGE |
1350 - 1540 MHz |
| ATTENUATION |
22dB (@ +1%) |
| ATTENUATION |
28dB (@ +2%) |
| ATTENUATION |
31dB (@ +3%) |
| PASSBAND |
1dB (loss) |
| WIDTH |
104 mm |
| DEPTH |
104 mm |
| HEIGHT |
340 mm |
| WEIGHT |
1.6kg |
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