Re: hacking bitx40 for 20 metre #bitx40


Arv Evans
 

On Sun, Jul 29, 2018 at 04:38 AM, <terryhugheskirkcudbright@...> wrote:
tHacking bitx40 for 20 metre
Terry GM4DSO

Way back in the early BITX  days there were several band conversion projects, and even some
band conversion kits.  Methodology was to determine the impedance of LC networks at the
original frequency and then determine the L and C values to obtain the same impedance at the
new frequency.  This usually involved using the calculator at https://toroids.info and then changing 
LO frequencies for the new band.  If the IF frequency is also changed the BFO will also need to be
changed. 

Arv K7HKL
_._

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