[Racal] A little trick to check and debug Racal 37,5 mhz BPF

[Denis Chouinard]

Use a gripdip meter tuned at 37,5 mhz  with maximum coupling to BPF coil.
You could monitor the output of the BPF on scope with gripdip meter over the
last coil of the BPF,  then you move the gridip toward input filter. That is
the best way to find open or miss tuned LC circuit

Good luck

Denis Chouinard
VE2 DSH