[Electronics-Talk] am/fm tuning in an hd market

Wed May 1 20:23:42 UTC 2019

Hi Steve,

This must have the antenna in the power cord it can run on about a half
dozen C batteries but I don't do that with it.  The cord if anything is
stretched out.

On Wed, 1 May 2019, Steve Jacobson via Electronics-Talk wrote:

> Date: Wed, 1 May 2019 15:45:04
> From: Steve Jacobson via Electronics-Talk <electronics-talk at nfbnet.org>
> To: 'Discussion of accessible home electronics and appliances'
>     <electronics-talk at nfbnet.org>
> Cc: Steve Jacobson <steve.jacobson at visi.com>
> Subject: Re: [Electronics-Talk] am/fm tuning in an hd market
>
> Jude,
>
> From what I know of you, you probably already know this, but often the power
> cord functions as the antenna on table radios for FM.  You could improve
> results by moving the power cord around.  Be sure you don't coil up the cord
> in an effort to get it out of the way, as that might make reception worse.
> If it is a battery operated radio that does not have an antenna, it is
> probably using the headphone cord and the same applies there.
>
> AM stations are received by a loop antenna inside the radio.  Make sure the
> radio is not oriented the exact wrong way for a specific station by rotating
> it slightly.  However, HD should not affect that.  I am not familiar with
> any radios that lock in on AM stations so am not quite sure what the issue
> is there.  A strong AM HD station will have what appears to be noise on
> either side of it but there should be a clear analog signal in the middle.
>
> Best regards,
>
> Steve Jacobson
>
> -----Original Message-----
> From: Electronics-Talk <electronics-talk-bounces at nfbnet.org> On Behalf Of
> Jude DaShiell via Electronics-Talk
> Sent: Wednesday, May 1, 2019 12:51 PM
> To: Andrews, David B (DEED) via Electronics-Talk
> <electronics-talk at nfbnet.org>
> Cc: Jude DaShiell <jdashiel at panix.com>
> Subject: Re: [Electronics-Talk] am/fm tuning in an hd market
>
> Hi Dave,
>
> This is a standard radio with no antenna connection possible.
>
> On Wed, 1 May 2019, Andrews, David B (DEED) via Electronics-Talk wrote:
>
> > Date: Wed, 1 May 2019 10:26:20
> > From: "Andrews, David B (DEED) via Electronics-Talk"
> >     <electronics-talk at nfbnet.org>
> > To: Discussion of accessible home electronics and appliances
> >     <electronics-talk at nfbnet.org>
> > Cc: "Andrews, David B (DEED)" <david.b.andrews at state.mn.us>
> > Subject: Re: [Electronics-Talk] am/fm tuning in an hd market
> >
> > Steve has given you a good explanation.  It shouldn't be more difficult,
> but it is RF after all, and odd things can happen depending on your antenna
> and your location.
> >
> > The other thing to remember is that the way most radios work is that they
> tune in the analog signal, and if an HD signal is present they change to it
> after about 7 seconds. This is because analog is essentially real-time, and
> digital must collect enough data to decode the signal -- hence the delay.
> If the station is properly engineered, this blend from analog to HD should
> be seamless, or almost so.  If not, there will be a stutter or worse.  Also,
> if you have a marginal digital signal, it may blend back to analog, and can
> even go back and forth. Try moving your antenna, or getting a better one.
> >
> > With many HD radios there are different antennas for AM and FM.
> >
> > Dave
> >
> >
> >
> > David Andrews | Chief Technology Officer
> > Minnesota Department of Employment and Economic Development
> > State Services for the Blind
> > 2200 University Ave West, Suite 240, St. Paul MN 55114
> > Direct: 651-539-2294
> > Web | Twitter | Facebook
> >
> >
> >
> >
> > -----Original Message-----
> > From: Electronics-Talk [mailto:electronics-talk-bounces at nfbnet.org] On
> Behalf Of Steve Jacobson via Electronics-Talk
> > Sent: Wednesday, May 01, 2019 9:01 AM
> > To: 'Discussion of accessible home electronics and appliances'
> <electronics-talk at nfbnet.org>
> > Cc: Steve Jacobson <steve.jacobson at visi.com>
> > Subject: Re: [Electronics-Talk] am/fm tuning in an hd market
> >
> > It is possible you are having more problems because of HD signals.  If you
> have a radio with digital tuning, you should not experience any difficulties
> on FM or AM.  However, if you have an analog  radio that employs some kind
> of Automatic Frequency Control sometimes called AFC, it can sometimes lock
> on to the HD portion of the FM signal instead of the analog part.  This
> won't happen all of the time, because there are some other variables.  While
> the HD portion of an AM signal is very apparent when one tunes, I am not
> aware of any reason you should have more trouble getting those signals with
> careful tuning.  You will hear an obvious sound on either side but the
> actual analog signal should be as clear as ever.  This may make a strong AM
> signal seem narrower, though, and might cause you to miss a station while
> tuning.  However, a strong AM HD signal could interfere with an analog
> station right next to it on the dial.  This can be a problem particularly at
> night when more frequencies
>   c
> >  ontain receivable stations, but is not usually an issue during daylight
> hours.
> >
> > Best regards,
> >
> > Steve Jacobson
> >
> > -----Original Message-----
> > From: Electronics-Talk <electronics-talk-bounces at nfbnet.org> On Behalf Of
> Jude DaShiell via Electronics-Talk
> > Sent: Wednesday, May 1, 2019 5:38 AM
> > To: electronics-talk at nfbnet.org
> > Cc: Jude DaShiell <jdashiel at panix.com>
> > Subject: [Electronics-Talk] am/fm tuning in an hd market
> >
> > It seems to be more difficult to tune and lock onto am and fm stations
> with standard radios in an hd heavy marketplace.  Is that actually the case
> or do I have a defective radio?
> >
> >
> > _______________________________________________
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