Band pass cavity filters for 144-146 MHz
|
 |
PSL2-3V
This filter is developed specially for an amateur 2 meters band. It helps to weaken blocking action of the professional radio stations and repeaters located nearby and eliminate their noise and interference. Rotating loops provide flexibility of tuning for different pass band width. Short-circuiting loops are protecting radio station from static electricity.
Typical selectivity characteristics PSL2-3V
PS5-2V
Are you tired of inter-modulation noise from the commercial radio stations while the competitions are being conducted? Then install our highly selective filter based upon the coaxial cavities PS5-2V! It will allow passing only the signals from the amateur radio within the frequency band of 300 kHz and attenuate all the interfering signals by the value of 30 dB and more (see the graph).
Typical selectivity characteristics PS5-2V
PS8-3V
The frequency bandwidth will be broadened up to 500 kHz while the selectivity will increase if you make use of the filter PS5-3V (or PS8-3V) based upon 3 cavities (see the graph). Typical selectivity characteristics PS8-3V
PS8-3V
|  |
PF5-1V
While installing the amateur repeaters on the masts close by the powerful FM and TV transmitters the necessity appear very often to apply additional filters in receiving circuits. Usually the duplexers for the amateurish relays are constructed on the basis of the reject circuit and do not possess high selectivity. In this case the usual band pass filter will be helpful, for example, based upon a single cavity PF5-1V.
Typical selectivity characteristics PF5-1V
Electrical specifications
| Model |
PSL2-3V |
PS5-2V |
PS5-3V |
PS8-3V |
PF5-1V
|
| Operating frequency band, MHz |
144-146
|
| Insertion loss (adjusted), dB |
0.6 |
1.5 |
2-6 |
2-6 |
0,5-3
|
| Maximum bandwidth, MHz |
2,0 |
0,3 |
0,5 |
0,5 |
-
|
| Impedance, Ohm |
50 |
| Attenuation |
see response curves
|
| VSWR, not more than |
1.5
|
| Input power, Watt |
150
| not more than 300
|
| Temperature range, ° |
-30° to +60°
|
| Cavity electrical length |
1/4 λ
|
Mechanical specifications
| Model |
PSL2-3V |
PS5-2V |
PS5-3V |
PS8-3V |
PF5-1V
|
| Diameter, mm (inches) |
55 (2") |
128 (5") |
128 (5") |
206 (8") |
128 (5")
|
| Weight, kg |
6 |
4,4 |
6,25 |
10,5 |
1,85
|
| Connector |
N-female
|
| Mount to 19-inch rack |
present
|
| Overall dimensions, mm |
58x165x560 |
800x480x140 |
800x480x140 |
800x480x420 |
800x128x128 |
|