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Date Posted: Mon 04/28/03 - 10:27:53 AM
Author: Michaeljwyo
Subject: Re: KALL 910 moving to 700
In reply to: Michael 's message, "KALL 910 moving to 700" on Sun 04/27/03 - 8:01:50 PM

I think there is some sadness involved due to the historical significance. The KALL calls and 910 frequency have been together for many years. Now the KALL calls will move on to 700 instead. No telling what the new calls will be for 910. KDZS, KDZU, KUDZ.....who knows.
In any case, a little explanation on the sound quality in Lynn's column. I imagine this was something that was complained about a lot more in the old days. Most AM radios have an IF frequency of 455 khz. Multipy that by 2, and you get 910. I believe the IF stands for "intermediate frequency" which I think means that this is the frequency that the AM tuner starts with and multiplies by whatever to get the frequency that you're trying to tune in. Since 910 is the IF multiplied by exactly 2, you get that "2nd harmonic" right there at 910....and consequently there is a little whistle at that point on the dial....the pitch of the whistle goes up or down as you tune the dial in each direction. The important thing here is that for the most part, we're talking about old ANALOG TUNING radios. Most of the newer digital tuners don't have this problem whatsoever. Even the newer analog tuned radios (like boom boxes and clock radios) don't seem to have this sort of problem. Analog tuned radios also had the possiblity of the user de-tuning it just a touch to where it's just a smidge off frequency....again causing the whistle to be more pronounced. With analog tuned-radios, not all listeners are "perfect" when it comes to tuning in an AM station and tuning it RIGHT ON frequency. Whereas again, with digitally tuned radios, there's no way you can be off....you tune it to 910, it's right on 910. So that is the sound issue that Lynn was talking about and I'm sure 10, 20, 30 years ago it was quite an issue and KALL would get complaints that there was this high-pitched whistle on their frequency. But I doubt it's much of an issue anymore. And it's just a property of AM radio that not much could be done about. There DO exist a number of AM radios out there that use a different IF frequency and then it wouldn't be a problem with those, but then again....how many radios are you gonna walk in Wal-Mart of BestBuy or wherever and be able to ask a salesperson "what's the AM I.F. Frequency on this thing?" :)
Hope this explains it a little better. I tried not to be too technical.

Michael n WYO

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