• Get involved.
    We want your input!
    Apply for Membership and join the conversations about everything related to broadcasting.

    After we receive your registration, a moderator will review it. After your registration is approved, you will be permitted to post.
    If you use a disposable or false email address, your registration will be rejected.

    After your membership is approved, please take a minute to tell us a little bit about yourself.
    https://www.radiodiscussions.com/forums/introduce-yourself.1088/

    Thanks in advance and have fun!
    RadioDiscussions Administrators

AM Broadcast HD Reception in a Moving Car

H

HudsonValley1967

I have been asked to explain why AM stations are received on a car radio, during the same hour period, oscillating between HD and analog.
Is this because reception in a moving car has multi-path problems? Is this because the car radio front-end is too narrow?
Please give the answer to this question so the "man/women" on the street can understand the answer. Thanks.
 
The HD (digital) portion of the signal is about 1/10 the analog signal (more or less). Therefore anything that happens to the AM signal will affect the digital portion first (since it is less powerful). When the digital is affected the radiol drops back to analog. When the digital signal gets stronger, the radio will switch back to HD.

Possible things that affect an AM signal include (but not limited to):
1. Going under bridges.
2. Goind under high voltage lines.
3. Local electrical interference.

But a popular issue is that you may be on the borderline of the digital signal. Good enough for analog listening, but not quite good enough for a digtal lock. So as the signal strength goes up and down as you drive around on the broder line, the digital will lock (HD) and unlock (analog) depending on local signal strength.
 
Status
This thread has been closed due to inactivity. You can create a new thread to discuss this topic.


Back
Top Bottom