Hi Bertus, is this circuits the same like he show me sir Bordodynov, can i use that circuit in place from this circuits with mosfet, i understand beter.Hello,
There are quite some dual gate mosfets.
I have used the BF980 and BF981 in the past.
If you really want to change the circuit to a BJT circuit, you could have a look at this post of your other thread:
Inject the signal of the oscillator to the emittor of the BJT.
Hello Bertus, i have just this question because now i understand, just local oscillator must 88-108mhz, like i read in internet ? correctHi Bertus, is this circuits the same like he show me sir Bordodynov, can i use that circuit in place from this circuits with mosfet, i understand beter.
and more question, normal local oscillator must be from 88-108mhz( i mean with tuning), for fm superheterodyne
Thank you very much Bertus, i understrand, have i nice day...Hello,
For an IF of 10.7 MHz, the LO must be 10.7 MHz higher or lower than the frequency to be received.
Read the section about the LO on this wiki page:
The frequency of the local oscillator fLO is set so the desired reception radio frequency fRF mixes to fIF. There are two choices for the local oscillator frequency because the dominant mixer products are at fRF ± fLO. If the local oscillator frequency is less than the desired reception frequency, it is called low-side injection (fIF = fRF − fLO); if the local oscillator is higher, then it is called high-side injection (fIF = fLO − fRF).
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