🚀 go-pugleaf

In article <1992Oct05.172142.5600@ssc.com>, markz@ssc.com (Mark Zenier) writes:
> 
> jeh@cmkrnl.com writes:
> : In article <1992Oct03.042813.15261@ssc.com>, markz@ssc.com (Mark Zenier) writes:
> : > In article <1992Oct1.165659.8131@bnr.ca> mwandel@bnr.ca (Markus Wandel) writes:
> : >>Say that everything was based on square waves, and that you started out
> : >>with a 38KHz clock waveform.  Based on this clock, you alternately select
> : >>the left or the right channel for transmission, transmitting a sequence
> : >>of samples L, R, L, R, L, R, etc.  
> : > 
> : > Did any commercial gear work this way?
> : 
> : Someone else mentioned that at least one of Heath's top-of-the-line receivers
> : did.  And many (most?  all?) recent color tvs demodulate the 3.58 MHz chroma
> : subcarrier this way. 
> 
> Sorry, the question should have been: Do commerical FM stereo transmitters
> work this way?  (I've been trying to come up with a cheap stable FM stereo
> exciter for a couple of years.)
> 
> My speculation is that, within the broadcast community, this technique
> is well known.  But outside that, most people are working off the
> description from the FCC regulations, which is the frequency domain
> description.  (Since they are more interested in bandwidth and 
> interference than simple design.)
> 
> So you end up with things like the North Country Radio/Graf and Sheets
> transmitter (Radio-Electronics March and April 1988) which used a
> balanced modulator for the 38 kHz subcarrier and was overly complex.
> And didn't work well, according to a friend who built one.
> (Which makes sense, keeping your phase responses right through all
> that would be hard.)
> 
> Mark Zenier  markz@ssc.wa.com  
> 
Speaking of old tuners, can anyone lend some insight into the historic 
Marantz 7B tuner which came out in about 1966??? It is still
regarded as one of the finest FM tuners made!!! A few years back, I go a bunch
of Marantz equipment from an estate sale. Aside from the fact that it uses
tubes and had a totally cool oscilloscope built into it, what made this tuner 
have such fantastic sensitivity and sound???? Is it possible to obtain a 
schematic and build a tuner with more modern components??