From an old engineer

[radiosaur]

I have a question for you guys who spend a lot of time listening around the band. Now that many Memphis FM stations are HD, have any of you found that some distant stations on the first adjacent channel you could hear before are now unlistenable due to HD hash? I have been listening to the CC stations, and the difference in the first adjacent channels is very noticable to me. It sounds like a completely empty channel, but it's really HD interference. Just wonderin'

<P ID="signature">______________
Never hold a cat and a dustbuster at the same time.</P>

 

[DeadElvis]

> are HD, have any of you found that some distant stations on...

Sure… the 1st adjacents are simply gone. I can mention a couple of examples: my days of hearing 96.9 from the Mississippi Delta are pretty much over. Hearing 95.9 in Potts Camp, MS is tough now.

But, this was expected. I belong to a TV/FM DX club, and those guys are really upset. Many folks have seen productive frequencies chewed up by this. But, they’re pretty much the only ones complaining. While there is clear interference here, it impacts stations outside their protected contours, while increasing the number of choices available to listeners in the marketplace. It’s probably a good trade – at least on FM.

Now, AM HD is an unmitigated disaster. Listen to 600; you’ll hear hash more than 20 kc down. In towns where locals are 40 kc apart (e.g., 1030 & 1070), that may cause issues when both stations are running HD. And, there really isn’t an answer for the whole skywave issue.

AM… 1920s technology, here today.

DE

 

[thedougpound]

DE:

Do you belong to any AM DX Clubs? if you do, i've seen you on some email lists.

Why should I never hold a cat and dustbuster at the same time?

 

[DeadElvis]

> Do you belong to any AM DX Clubs? if you do, i've seen you
> on some email lists.

I do...

WTFDA's AM list comes across my screen. I don't contribute much; but, it's interesting to read, from time to time.

DE

 

[radiosaur]

>
> Why should I never hold a cat and dustbuster at the same
> time?
>

That's from a list of kid's sayings. Try it one time and let me know how it works out. Make sure the Dustbuster's on.


<P ID="signature">______________
Never hold a cat and a dustbuster at the same time.</P>

 

[radiosaur]

> Now, AM HD is an unmitigated disaster. Listen to 600;
> you’ll hear hash more than 20 kc down. In towns where
> locals are 40 kc apart (e.g., 1030 & 1070), that may cause
> issues when both stations are running HD. And, there really
> isn’t an answer for the whole skywave issue.
>
> AM… 1920s technology, here today.
>
> DE
>

Agreed. In fact once again (The first one being AM stereo) Leonard Kahn has a more technically sound solution, but he's once again steamrolled by the big guns.<P ID="signature">______________
Never hold a cat and a dustbuster at the same time.</P>