[Elecraft] K3 General Coverage Recieve

[AD6XY - Mike]

Yes - but where the UK leads....  at least in the US they get the voice of
reason on AM for ironic entertainment. All we get is 5 live and a few local
radio stations.

In terms of audio quality, I think there has been a reduction in recent
years. It is AM so it does not matter sort of attitude. Yes there will be a
limit at around 3kHz with the 6kHz filter on the high frequencies but
whenever I listen there is a lot of mush lower down on broadcast radio
transmissions these days. You might expect at least the bass to be good but
often it isn't as it tends to require more of the transmitter power - so for
something to sound loud bass is cut and midrange boosted. For speech fine
but the same settings are no good for music. 

Back to the K3. The correct filter to listen to AM broadcasts will be the FM
filter. 6kHz is too narrow, it is designed for amateur transmission. A 10
kHz filter would be better but I am sure the DSP can cope with removing the
leakage from adjacent channels due  to the 15kHz filter.

Mike



G4ILO wrote:
> 
> 
> AD6XY - Mike wrote:
>> 
>> Most of these AM transmissions in the UK are very poor quality to begin
>> with. Not just the content, but also the audio compression and filtering.
>> The better the quality of the radio you use, the more you notice this.
>> 
> I don't see why this would be specific to the UK (and I didn't think the
> OP was referring to British stations in any case.) Short wave broadcasters
> use a 5KHz spacing so the transmitted bandwidth is bound to be below hi-fi
> quality. The use of compression is probably also normal to maximize
> readability under poor conditions.
> 

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