could VFO frequency be below IF ?
hi,
I'm experimenting with my superhet. My IF is 8mhz (cause I have 8 mhz crystals for IF filter). I first experimented on 40m. VFO was 15mhz. At design time I'm using 3 meters long wire as an "antenna" (and I'm sitting in my basement). I heard different european stations (EA5FKX, RW6XE, UR4GI etc) which are several thousand km-s away. Pretty amazing for such "antenna"! So I decided to go for 20m band. I had an option to set my VFO either to 6mhz or 22mhz. I first went with 6mhz. But for my disappointment I heard nothing but the band noise. So I'm confused now - is it because the short "antenna" or am I wrong thinking that VFO 6mhz + IF 8mhz should give me 14mhz? any ideas? |
could VFO frequency be below IF ?
Yes.
It was often used in two band trx - with 9MHz IF and 5-5,5MHz VFO. result was 80m and 20m without VFO switching. MAc |
could VFO frequency be below IF ?
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could VFO frequency be below IF ?
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