Re: [IRCA] IBOC Hash AM vs FM OT question

[Mike Hawkins <michael.d.hawkins@xxxxxxxxx>]

To me, FM IBOC is like bacon sizzling as its cooking.  It not as obnoxious
as it is on AM, but it has the same effect.  As an example, 97.3 in San
Francisco (xmtr 20 or so miles away) runs IBOC.  It does not have obvious
artifacts on adjacent channels.  If they turn it off (as they sometimes
do), I immediately have a strong signal from Visalia CA (200 miles away)
and a RDS readout.  I don't get RDS on 97.5, but I also get a strong signal
from 97.5 in Merced about 130 miles away.  Its effect is as bad on FM as it
is on AM.  You just don't notice how bad it really is until you can do an
IBOC on/IBOC off comparison.

I have a college station on 91.1 that uses HD 1 mile away from me.  I
cannot get the Sacramento powerhouse on 90.9 until I am 15-20 miles away,
and if I hear anything at all on 91.3, I know its skip.  The Stockton
station on 91.3 NEVER comes in at all.

Mike Hawkins

On Mon, May 18, 2015 at 12:33 AM, Patrick Martin <mwdxer@xxxxxxxxx> wrote:

> This is a bit off tropic, but I know some of you DX FM at times. I just
> got an FM6 yagi up and I am very impressed with the Sony XFR radio. Between
> the filters and sensitivity, it leaves my old Pioneer TX9100 in the dust
> (1970s). Anyway, out here on the Northern Oregon Coast we have no AM or FM
> HD stations. The nearest are Newport (100 miles), Portland (75 miles), or
> Seattle (130 miles). I have received several FM stations in HD. A few stay
> locked and others come and go. But so far I have not detected any hash on
> adjacent frequencies. None. The tuner is very selective and sensitive. I
> can easily get weak stations next to locals without any splash. The HD
> signals like 95.7 Seattle, I can easily get 95.9 Bay City OR, and so on. AM
> IBOC hash is horrible as we all know and covers great distances. Off the
> Eastern Beverage I have heard IBOC hash from the Midwest at night. But so
> far nothing on FM. This is my first shot at hearing FM HD. One thing I will
> say, the FM dial is sure a l
>  ot different than it was 20 years ago. Translators all over the place
> along with some LPFMs. By the way, I do find FM HD to be touchy, as I get
> nothing in HD from Portland over the Coast range, not even a flashing HD
> symbol. But Seattle from Cougar & Tiger Mountains come in much stronger. I
> have even caught several with their sub channels. But does FM IBOC hash
> cause as much noise locally? It sure does not carry very far. I cannot wait
> for my first E Skip as I might get a taste of "local" sounding station in
> HD.  Thanks.
>
> Patrick
>
>
> Patrick Martin
> Seaside OR
> KGED QSL Manager
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