[R-390] R390A Turns Counter BFO option?

[rbethman]

It would seem that *SOMEWHERE* there is a *documented* modification for 
the turns counter that gives the "expanded" BFO range.

I have mental reservations with *this* described method.

I doubt Uncle Sam took *this* route to achieve the desired result.

Bob - N0DGN

On 3/13/2011 4:52 PM, nryan at mchsi.com wrote:
> Fellow Mavens,
>
> The BFO range can be expanded by removing the rotation limiting tang under the BFO knob.  Be advised that doing so risks damage to the very fragile powdered iron core inside Z502.  Turn it too far and it will break.
>
> A broken powdered iron core sometimes can be repaired with careful application of JB weld.  Check that the repaired core is straight and true inside the coil.
>
> If a MicroDial is added, zero it on 455 kHz and don't force it against the core's travel limit.
>
> 73 de Norman, KG4SWM