I have not looked at the EICO modulator clipper. But I would expect it to be the type of speech processor shown in the ARRL handbooks from the 50's and 60's.
I work with both tubes and solid state. Today this is the kind of thing that would be done with DSP. Why? Remote control! Look through some of the older ARRL Handbooks. These are easy to do in either tube or transistor circuits. In tube circuits it was common to use inductor/capacitor low pass filters. In transistor designs it was common to use active filters. Bob Macklin K5MYJ Seattle, Wa, "Real Radios Glow in the Dark" ----- Original Message ----- From: "RJ Mattson" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" <[email protected]> Sent: Friday, February 15, 2008 7:25 AM Subject: Speech Processing Re: [AMRadio] RE: MODULATION POWER REQUIRED > Bob > Let me know what u decide on. I'm running qrp AM and need every ounce to be > intelligence. > I can't waste power to be hifi. > Was your ckt similar to the Eico modulator clipper? > I assume you will strictly use tooobes? :-) > > bob...w2ami x wn2ami 1962 > > > ----- Original Message ----- > From: "Bob Macklin" <[EMAIL PROTECTED]> > Subject: Re: [AMRadio] RE: MODULATION POWER REQUIRED > > > I understand the modern RICEBOXES had speech processing the clips peaks and > filters the audio. > > I had a tube speech processor back in the 60's. It was a classic > clipper/filter. It worked very well. For a lower power transmitter like the > smaller Heath DX units you can increase the voice level clipping and > filtering there by generating a higher modulation index without over > modulating. And if properly set you won't exceed the legal limits. > > I am going to build another one for my current DX-60. > > Bob Macklin > K5MYJ > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/[email protected]/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
