anyone ever try broadcasting C-QuAM in Carrier Current. it's obvious that C-QuAM won't work in a Part 15.219 Compliant System, but what about Carrier Current? How well would C-QuAM work in Carrier current Systems.
First of all, why do you say that C-QUAM won't work in a Part 15.219 compliant system? I'm not aware of any reason why that would be the case. The transmission range of C-QUAM isn't much less than standard AM. So other than getting a transmitter built, I would think it should work.
As for a carrier-current setup, the main problem I am aware of is hum. Most carrier-current systems seem to be plagued by a lot of 60 and 120 Hz hum. I am not sure if that would affect the ability of the decoder in the receiver to properly detect the C-QUAM signal.
My main question would not be technical feasibility, but rather why are you doing this? There aren't any commercially available receivers any more that I know of. So who is going to listen to you in stereo? If you just want to tinker to see how it sounds, go for it! But I think you will be the only listener, especially indoors. The last C-QUAM receivers that were mass produced were car radios, as far as I know.
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Rich can explain it better than me, but it has something to do with the L-R Subcarrier and the RF Bandwidth in Part 15.219 compliant antenna systems.
Thank You,
Rev. Robert P. Chrysafis
Universal Life Ministries
http://www.ulc.org
Moderator Hunterdonfree
http://groups.yahoo.com/group/hunterdonfree
There is nothing in 15.219 limiting the r-f bandwidth of a Part 15 AM setup, so as to prevent the use of AM stereo. That r-f bandwidth is related to the 'Q' of the complete r-f transmission system.
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Hmmmm, maybe it's time to fire up my chris cuff ams tx and do some experiments. I thought the limited RF bandwidth of a part 15.219 setup was related to the fact that we are limited to a 3 meter radiator and that no matter how you set it up it's not going to acheive even a 10khz RF bandwidth. AMS from what i understand requires a 14-20khz RF bw to funtion and sound properly.
Thank You,
Rev. Robert P. Chrysafis
Universal Life Ministries
http://www.ulc.org
Moderator Hunterdonfree
http://groups.yahoo.com/group/hunterdonfree
Rev,
It's been awhile, but I recall hearing something about Chris Cuff's xmtrs having a much higher frequency response (14 KHz?) and therefore higher bandwidth than conventional broadcast AM. That may be the possible compliance issue that you are referring to.
I also recall that he will sell a simple carrier current hook up for home use, which is basically a capacitor or something like that.