Inrad has designed an adapter board to allow the use of the new series Collins mechanical
filters in the 75S3B/C radios. The filters available are listed below. All filters
have a center frequency of 455 kHz.
Two specially designed networks are included on the adapter board to match the input and output impedance of the new series filters to the radios. The original filters had a very high impedance whereas the new series are 2000 ohms. The resulting signal level through the adapter board is very close to that of the original filters.
The adapter is constructed on a double sided FR4 pc board with plated through holes. Surface mount components are used in the production units. The board contains pads for through hole components which can be supplied for special uses. Gold plated pins are swaged into the board so it may be plugged directly into the 75S3B/C filter sockets.
Installation consists of plugging the adapter, assembled with the filter of choice, into the radio. The resonating capacitors in the radio can be set to fully CW, then backed off 1/4 turn.
| Reference | |||||
| Bandwidth at -6dB | |||||
| Mode | |||||
| Center Freq. KHz | |||||
| Performance Curves Online? | |||||
| PRICE |
TO ORDER: Make note of the filter Reference Numbers above, then visit our Secure Order Form.
Carrier crystals for Collins receivers and transmitters are available.
Specifications are:
Over -10 to +70 degrees C: +/-100 ppm |
||
TO ORDER: Make note of the Reference Numbers above, then visit our Secure Order Form.
Back to Crystal Filters Main Menu
