L3 is before the mixer, so it's still 88-108Mhz raw VHF (FM). My best guess is that L3 and the resistor make up a crude high-pass filter, especially if this is an AM/FM radio, to prevent AM (and other signals) from interfering with the mixer. I dont understand why the other side of the coil has only 1 connection. Perhaps it's a clever/bizarre way to minimize noise.
You are correct about the resistor; it provides a DC path for the bias current of Q2. Do you have an RF oscillator and scope ? You could inject a 100Mhz signal at the antenna terminals and use a scope to find out where things die. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/8cf69ace-ee89-4c59-9932-c3d88959c77f%40googlegroups.com.
