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Old 10th Jan 2019, 11:06 am   #7
Sideband
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Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,550
Default Re: KB FB10 - I.F. frequency query.

If the alignment is too far out you may get whistles on some stations. I seem to recall that early Japanese radios with a 450Khz IF would whistle on the BBC Home service (Radio 4 as it is now) when they used 330 metres due to second harmonic interference (900Khz). We used to slightly alter the IF to 455Khz which took the 2nd harmonic just out of range of R4 but didn't effect the sensitivity or tuning of the radio to any great extent.
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