Picture source : Ebay
Thanks to Barrie C. Hiern, Sr ( K5SGP )
FF-1 Fixed Frequency Control for TR-4 and TR-6
FOR TR-6
To calculate the FF-1 crystal frequency:
| Band | Range | Formula (fd=desired frequency) |
| 49.5 | 49.4-50.0 | fd -44.5 = FF-1 crystal frequency |
| 50.0 | 49.9-50.5 | fd -45.0 = " |
| 50.5 | 50.4-51.0 | fd -45.5 = " |
| 51.0 | 50.9-51.5 | fd -46.0 = " |
| 51.5 | 51.4-52.0 | fd -46.5 = " |
| 52.0 | 51.9-52.5 | fd -47.0 = " |
| 52.5 | 52.4-53.0 | fd -47.5 = " |
| 53.0 | 52.9-53.5 | fd -48.0 = " |
| 53.5 | 53.4-54.0 | fd -48.5 = " |
For example: Desired frequency is 50.160 MHz. Band 50.0 MHz. Subtract 45.0 MHz from 50.160 MHz and 5.160 MHz is the frequency of the crystal needed for the FF-1. Add a kHz for CW operation.
Thanks to Barrie C. Hiern, Sr ( K5SGP )
