Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
|
omni30mmod [2017/04/29 14:28] n1ooq |
omni30mmod [2017/04/29 14:49] n1ooq |
||
|---|---|---|---|
| Line 58: | Line 58: | ||
| The 9 MHz trap: {{:9_mhz_trap_-_photo.jpg?100}} | The 9 MHz trap: {{:9_mhz_trap_-_photo.jpg?100}} | ||
| - | ==Adding the bandpass filter to the board== | + | ==Adding the bandpass filter and 9 MHz trap to the board== |
| - | The stack is hot-melt glued to the bandpass filter board. It is attached vertically in approximately the same position as the Tentec transformer can for the original mod. There is a resistor which must be moved - see the Tentec instruction sheet. | + | The stack is hot-melt glued to the bandpass filter board. It is attached vertically in approximately the same position as the Tentec transformer can for the original mod. There is a resistor which must be moved - see the Tentec instruction sheet. Both of these filters must be kept out of the way of the bandswitch shaft, which is nearby when the boards are re-installed in the radio. |
| Bandpass board, bottom side, showing pads for 30m mod. At left, output. At the center, ground. At right, input: {{:img0025a_-_edit.jpg?100}} | Bandpass board, bottom side, showing pads for 30m mod. At left, output. At the center, ground. At right, input: {{:img0025a_-_edit.jpg?100}} | ||
| Bandpass board, top side, showing finished 30m filter mod (between bandswitch and the shield can at the right): {{:img0032a.jpg?100}} {{:img0033a.jpg?100}} | Bandpass board, top side, showing finished 30m filter mod (between bandswitch and the shield can at the right): {{:img0032a.jpg?100}} {{:img0033a.jpg?100}} | ||
| + | |||
| + | The 9 MHz trap is inserted in series with the input of the bandpass filter. On the prototype, it was hot-melt glued to an open area of the adjacent RX trimmer board, in such a way that the trimmer capacitor was easily accessible. | ||
| + | |||
| + | Mounting location for the 9 MHz trap on the RX trimmer board: {{:img_1030_-_edit.jpg?100}} | ||
| ==Adding the lowpass filter to the board== | ==Adding the lowpass filter to the board== | ||
