[IRCA] KJR NON-IBOC

[Pete Taylor <ptdx@xxxxxxxxxxx>]

I asked Dave Grytness, our KHHO tour guide, why KJR wasn't running  
IBOC while sister station KHHO was. Those of you who are technically  
inclined I am sure will appreciate his response. I don't recall that  
the issue of stations 50kHz or less apart has come up before.

Pete Taylor, Tacoma
ICF2010 + Kiwa loop
=================================
> As for KJR, there is a shunt filter tuned to 1 mHz on the common  
> point which keeps KOMO from getting into the KJR system.  Because  
> of the filter the necessary bandwidth for IBOC transmission would  
> not be symmetrical on both the lower and upper sidebands.  The  
> upper sideband would get into the lower slope of that filter making  
> IBOC a no go.  I believe the filter covers 970 to 1030.  The Q is  
> pretty sharp but still around 970 it would interfere with any IBOC  
> on KJR as IBOC at that point in the USB would be 20db down from the  
> carrier and the filter would be just kicking so it would dump some  
> of the IBOC to ground on its way out meaning VSWR.  Also receivers  
> like to see symmetrical sidebands for proper digital decoding.
>
> Dave
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