🚀 go-pugleaf

Hello, i'm trying to design a ckt which accepts a ch3 rf signal and
demodulates/separates the video and audio components.  I started with 
a ckt in RE which uses a MC1350 preamp and a MC1330 low level video 
detector.  In theory the output of the MC1330 should have a bandwidth of
> 8MHz which would allow me to (a) low pass filter it (cutoffT 4Mhz) for 
the video out and (b) band pass filter it at 4.5M then pass the audio carrier
on to a MC1358.  This unfortunately is only in theory.. it seems that the
bandwidth of the 1350/1330 combination is much less that 8Mhz, so depending
on how I tune the input ckt, I get either fairly noisy sound or video.
Moreover when I tune in the sound, I get the noise caused by the horizontal
sync pulses bleeding into the audio.

This leaves me with several questions.. 
(a) how can I improve the bandwidth and noise performance of the input 
    ckt?

(b) Would an active band pass filter perform better the the RC circuit that I
    have now? I checked out some active filter cookbooks, but all the
    active bandpass filters there seem be in the audio range.

(c) What type of low pass filter is best for filtering the output video?


I thought it would be relatively simple to modify the RE ckt, but as I have
learned rf electronics is challenging, especially if you want output
signal with good SNRs :-) :-).

Nevertheless, I'm enjoying the experience, but would really welcome any 
help/discussions/ckt diagrams from the gurus on the net.  Please send
mail to douglas@ctr.columbia.edu.  

Thanks, Paul