[Elecraft] [K3] Hearing aids, meet K3

[Al Lorona]

Nope, sorry it was me that wasn't clear. I did indeed mean audio bandwidth.

Look at any AM station with your P3 -- it will be easy to measure the bandwidth. I rarely if ever see anything less than 7 kHz (14 kHz total BW) for an HD station, higher for all-analog stations.

Al  W6LX





>________________________________
> From: Ron D'Eau Claire <ron at cobi.biz>
>To: 'Al Lorona' <alorona at sbcglobal.net>; elecraft at mailman.qth.net 
>Sent: Wednesday, August 7, 2013 8:07 PM
>Subject: Re: [Elecraft] [K3] Hearing aids, meet K3
> 
>
>Right Al, it takes 10 kHz of RF bandwidth with A.M. to produce 5 kHz of
>audio bandwidth after demodulation. 
>
>I thought my comment was clear in context. The thread was about the
>desired/necessary audio bandwidth. My apologies for the confusion. I should
>have said "audio bandwidth". 
>
>73, Ron AC7AC
>
>-----Original Message-----
>From: elecraft-bounces at mailman.qth.net
>[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Al Lorona
>Sent: Wednesday, August 07, 2013 5:48 PM
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] [K3] Hearing aids, meet K3
>
>That is the common misconception. Actually most AM stations go out to at
>least 10 and often 12 kHz (look on your P3). The exceptions are the stations
>transmitting an HD signal -- they are necessarily band-limited to 7 kHz. I
>boycott HD stations for that reason. I can tell the difference on a good
>wideband receiver.
>
>I know this because I went through it in the pre-HD days with my senior
>advisor who had the common misconception. Even after I proved him wrong (by
>actually telephoning the chief engineers of KFI and KNX) he still gave me a
>'D' on my senior project. Sour grapes.
>
>Al  W6LX
>
>
>A recent report in "Radio World" notes that most analog A.M. broadcast
>>receivers today have a bandwidth of less than 5 kHz. 
>>
>>
>>
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