[Milsurplus] BC-348 IF frequency shift?

wf2u at starband.net wf2u at starband.net
Mon Dec 10 16:21:24 EST 2007


If there is enough adjustment range in the trimmers/coil cores, you should
have no problem. If an adjustment is already close to one end or is at the
end of its adjustment, it won't work.
As it is, the IF adjustment procedure on any receiver with a single
crystal filter is to peak the IF at the crystal frequency (as it ages, its
resonant frequency will change). Most likely, an original  crystal won't
be as far off from aging like in your case 6 KHz on the new crystal - so
probably everything still would be in the adjustment range.

73, Meir WF2U
landrum, SC

>
> Here is a "thought experiment" question.Say you had to replace the
> BC-348 IF crystal with one at say, 921 kHz instead of  the original 915
> kHz. Will the IF aligned to 921, will the set set align at HF okeh? I'm
> thinking now of ONLY the models with NO LF band, because that might be
> more of a challenge to come up right. What say? Maybe even the LF band
> would still align "pretty much okeh" ?  -Hue Miller





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