Quote:
Originally Posted by humhum
Hi Franco, this is part High Freq. from main Resonant Frequency of Gold. But here problem is that max. operation Output Freq (OSC) of cd4046 is up to 1.6 Mhz. (Datasheet)
If I not know wrong OSC of 4046 + input Freq OSC from Stylus Antenna make Mix and giving ference freq for Output (for example 1Khz), so like Radio mixer.
If is so OSC from CD4046 not will High Frequency 9 or 10 Mhz .
|
There are 2 versions of my lrl, one is with CD4046 and it works (in my case) at 2.8Mhz, it is not convenient a higher frequency (over 3Mhz absorbs too much), however with the normal type it is not possible to go further, but it is not necessary. The version with the quartz, as already mentioned, can work from 3 to 10Mhz. The TR2 stage is called mixer, but not in the sense used in radio receivers, in fact here there is not a frequency conversion (we would need very wide signals and here is not the case), but rather an amplitude modulation on the contrary, in fact the signal to lower frequency (for example 8Mhz) is modulated (I would say almost disturbed) by the much higher frequency signal coming from the antenna (about 100Mhz). Regarding the frequency of resonance of gold I do not think it is possible to tune my lrl, also because you first need to know the value of this frequency, if it exists.