26-04-2017, 09:59 AM
(This post was last modified: 26-04-2017, 09:59 AM by Geordie McBoyne.)
And now we know why the RF tuning coil cores are metal instead of iron dust cores. After further examination of the RF circuits it would appear that the set was retuned to receive the Birmingham transmitter.
The RF tuning cols have less turns than are required for 45Mc/s and the tuning cores are metal. Also, the big giveaway to confirm that the set is tuned to channel B4 is that local oscillator tuning capacitor has been changed from 40pF to 22pF. The local oscillator will be tuned to 53.75Mc/s instead of 37Mcs.
Geordie McBoyne.
The RF tuning cols have less turns than are required for 45Mc/s and the tuning cores are metal. Also, the big giveaway to confirm that the set is tuned to channel B4 is that local oscillator tuning capacitor has been changed from 40pF to 22pF. The local oscillator will be tuned to 53.75Mc/s instead of 37Mcs.
Geordie McBoyne.
