[1000mp] Dead Band sound?

[Pete Smith]

What happens if you disconnect the antenna while listening to this dead 
band sound - does the sound level drop?

73, Pete N4ZR

At 07:44 AM 2/25/2005, you wrote:

>Good morning!
>
>I've got a really dumb question: What should a dead band sound like?
>
>I've got a fairly new MkV - xmas purchase. Two weeks ago I installed a full
>set of INRAD's including the roofing filter. I haven't had the radio long
>enough to remember how things sounded before installing the filters.
>
>On a 'quiet' band I hear what sounds like a louder version of the sound you
>get from a seashell - not a hiss but a steady 'whoosh'. It's steady, not
>pulsing, and it is quieter on the high bands (10, 12, 15) than 40 or 80. The
>narrower the filter, the lower the pitch.
>
>Just to be sure, I opened the case and took the roofing filter out of the
>loop with the same result. A little quieter because the gain is down (I
>adjusted RF gain from 14 to 12 after installing the roofing filter). I
>confirmed that the board was getting the 5V that it needs. So I think that's
>ok.
>
>The lower I set the RF gain the quieter it is, but then I'm it would be
>going deaf at that point.
>
>The one thing I haven't done yet is pull out my FT990 and listen - I feel
>like I'm losing my mind and asking a really dumb question, but does this
>sound like a normal sound? Signals are bright and clear - it's just on the
>empty space that it seems louder than it should.
>
>What do you think?
>
>-Brian n8wrl
>
>
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