[Elecraft] Uncontrolled full volume with NR Firmware 3.27- Warning very loud!!

[Bob Allen]

Any strong unmodulated carrier seems to work. Theses are the things that 
you would use the autonotch filter for.
Not sure if this sounds exactly like caddisflies but I saw a horror 
movie 25-30 years ago that when bad stuff was going to happen the 
caddisflies would all start making a very loud noise that sounds like 
this. Watch out for what follows, very loud and you can't turn it down, 
have to power off.
Bob
KB1FRW

Steve Ellington wrote:
> Bob:
> "The Birdie"? What birdie are you speak of that we too might tune 
> across it. I have this urge to listen to caddisflies.
>
> Steve
> N4LQ
> N4LQ at carolina.rr.com
> ----- Original Message ----- From: "Bob W Allen" <mcamp at gmavt.net>
> To: <elecraft at mailman.qth.net>; <support at elecraft.com>
> Sent: Saturday, August 29, 2009 3:22 PM
> Subject: Re: [Elecraft] Uncontrolled full volume with NR Firmware 
> 3.27- Warning very loud!!
>
>
>> Now I can make this happen repeatedly, with the NR at 1-4 and the notch
>> filter on auto as I tune across the birdie the volume goes very loud, it
>> is louder  than any noise I can get the radio to do normally with the AF
>> all the way up.
>> I have discovered that this only does this in the NR 1-1 to 1-4 range,
>> very repeatable. As you tune through the birdie the radio starts making
>> a noise like caddisflies (moderate high pitched fast oscillation) then
>> it becomes very loud white noise. I don't spend anytime playing with the
>> controls but I know the AF does nothing.
>> I copied this to Elecraft tech support.
>> MCU (uC) 03.27, main DSP (d1)2.24, aux DSP (d2, if KRX3 is present),
>> flash parameters (FL)01.02, and KDVR3 controller (dr )01.03.
>> This is very loud, be careful!!
>> Bob
>> KB1FRW
>> 73
>>
>> Bob Allen wrote:
>>> An odd thing happened today, I was tuning through an area on 20m 
>>> where I
>>> have a birdie, about 14.270-14.273.
>>> The noise reduction was on at 1-3 I think, I don't know what state the
>>> notch filter was at or the noise blanker, as I tuned into this area the
>>> audio was a bit odd, like screechy, I didn't think to much of that
>>> because of how the noise reduction works around birdies, but it was
>>> different than I had heard in the past.
>>> All of a sudden the volume in the headset and the internal speaker went
>>> to max and turning the volume control had no effect.
>>> I shutdown the radio to avoid damaging things and when I turned it back
>>> on everything was fine and I can't make it do this again.
>>> Very odd (and painful), wondering if this has happened to anyone else.
>>> Bob
>>> KB1FRW
>>> 73
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