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Post by Deleted on Jan 10, 2018 11:45:03 GMT
Time to Reverse Windmills
Boomer came up with the idea: "Reverse your windmill by hand for better audio fidelity."
Not too many AM radios have bandwidth selectors, but a few do.
There's a radio in the other room, I think it's a Grundig Satallit 750, which has "Wide and Narrow".
This little radio right here, a TECSUN PL-310, has settings 6 kHz, 4 kHz, 3 kHz, 2 kHz and 1 kHz!
Needless to say the higher the better for voice and music quality.
The range of music tops out at somewhere above 4 kHz, but the upper harmonics of sound is what gives it realism and character, that's why we need response of at least twice the basic fundamental frequencies.
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Post by mark on Jan 10, 2018 23:14:06 GMT
Yes!...you hit the nail on the head. It's at the receiver end of things and no one cares enough for radio makers, even HI-FI tuners, to care about AM performance and audio quality. A few exceptions are the GE Super Radio 3, Grundig field radio model 450?, I think has a wide band switch for AM and maybe a Carver tuner as I read has put more into AM to make it more "HI-FI" and loose a lot of the noise. Maybe a revitalization at the receiver end of things is what the FCC should be looking at and not just clogging up the FM band with translators. Here's a Carver tuner with 20HZ-15KLZ on AM! with noise elimination and wide band selection with extra gain control. AM could be good!! www.carversound.com/carver-tuners/tx-11b/www.audioscope.net/images/carver_tx_11b-2.jpg |
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Post by thelegacy on Jan 11, 2018 2:11:20 GMT
Yes Carver made great tuners. I used to have one. And I really enjoyed it.
yes some of the things that you talked about with the sound quality is the exact reason I cannot use am for album Rock it makes it almost impossible as my listeners are looking for HiFi but I'm trying to see what I can do to get them to get better radios so that they can listen to my station. I think after I had to vacate FM some will do what it takes to listen.
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Post by mark on Jan 11, 2018 5:32:23 GMT
Yes Legacy I understand why album rock is hard to do on AM.
If you can convince listeners to get this....https://radiojayallen.files.wordpress.com/2015/03/eton-stock-photo-front-large.jpg
You will do OK as this is not too expensive and has wide band for AM.
You can also pick up one of those Carver models for between $100 and $150 on Ebay.
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Post by Boomer on Jan 12, 2018 0:43:01 GMT
I've always taken it that the competition for sound quality is AM versus FM. When you switch a radio between the two bands and there's so much difference in the sound quality, it's like an evil hint every time, that something's wrong with AM. It used to be that there wasn't much difference on smaller portables.
The 10 khz audio response limit the NRSC came up with was intended to help second adjacent channels not get splattered. I don't know where the splatter problem was actually happening; the radio press at the time said there was "monkey chatter" heard between stations, but no examples were cited in anything I read, and I never heard the problem either. I didn't hear a difference post-NRSC 10 khz limit either.
The ruling for 10 khz response was touted as a way to improve frequency response in radios, to allow them to open up audio response more, or better yet, make radios to the AMAX standard with stereo and noise reduction. It seems like manufacturers took things in the wrong direction!
I think it's good to put any format on AM, if someone finds it and listens, they'll like having it there, as opposed to not having it at all.
I have a friend that I used to go to Dayton Hamvention with, and it was a big long trip, taking time off to do it, days away, gas money, loading up the van with items to sell. He had this sage advice:
"If I thought about the logistics of doing all this I wouldn't bother, so I just go."
Boomer
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