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250hz Filter - Audio drops

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Chester Alderman

250hz Filter - Audio drops

This is driving me crazier!
My narrow filter is 250hz (FL4). FL4 cuts in when I change my DSP filtering
to 250 hz, as it should. FL4 stays in as I make DSP more narrow, all the way
to 50 hz.
The problem is that when I change DSP from 150hz to 100hz or to 50hz, my
audio output seems to drop tremendously, to the point I have to increase the
AF gain to hear the intended signal. The audio does not come back to
'normal' level until I change DSP from above 100hz bandwidth.
I have FL4 set for 2dB gain; FL4 FRQ set to 0.00.
Would appreciate any suggestions to fix this as I hope it is not 'normal'
operation?
Tom - W4BQF

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George Dubovsky

Re: 250hz Filter - Audio drops

This bit me a few months ago: You probably have RX EQ boosted, and this is
disabled for 100/50 Hz DSP filltering.

73,

geo - n4ua

On Mon, Jan 3, 2011 at 5:33 PM, Tommy Alderman <[hidden email]>wrote:

> This is driving me crazier!
> My narrow filter is 250hz (FL4). FL4 cuts in when I change my DSP filtering
> to 250 hz, as it should. FL4 stays in as I make DSP more narrow, all the
> way
> to 50 hz.
> The problem is that when I change DSP from 150hz to 100hz or to 50hz, my
> audio output seems to drop tremendously, to the point I have to increase
> the
> AF gain to hear the intended signal. The audio does not come back to
> 'normal' level until I change DSP from above 100hz bandwidth.
> I have FL4 set for 2dB gain; FL4 FRQ set to 0.00.
> Would appreciate any suggestions to fix this as I hope it is not 'normal'
> operation?
> Tom - W4BQF
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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Dave Hachadorian

Re: 250hz Filter - Audio drops

In reply to this post by Chester Alderman

I don't see that behavior here. Make sure that your SHIFT center
frequency equals your PITCH setting.

Dave Hachadorian, K6LL
Yuma, AZ

-----Original Message-----
From: Tommy Alderman
Sent: Monday, January 03, 2011 3:33 PM
To: [hidden email]
Subject: [Elecraft] 250hz Filter - Audio drops

This is driving me crazier!
My narrow filter is 250hz (FL4). FL4 cuts in when I change my DSP
filtering
to 250 hz, as it should. FL4 stays in as I make DSP more narrow,
all the way
to 50 hz.
The problem is that when I change DSP from 150hz to 100hz or to
50hz, my
audio output seems to drop tremendously, to the point I have to
increase the
AF gain to hear the intended signal. The audio does not come back
to
'normal' level until I change DSP from above 100hz bandwidth.
I have FL4 set for 2dB gain; FL4 FRQ set to 0.00.
Would appreciate any suggestions to fix this as I hope it is not
'normal'
operation?
Tom - W4BQF

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http://www.qsl.net/donate.html

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Chester Alderman

Re: 250hz Filter - Audio drops

In reply to this post by Chester Alderman

Thanks for the three direct responses I have already gotten. My SHIFT center
frequency is set for 540 hz, the same as my Pitch setting. I did have RX EQ
with everything set for 0dB except for 400 and 800 hz, which I have set for
+8 and +16, respectively.

I still have the audio drop with DSP set for either 100 or 50 hz.

Tom - W4BQF

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Tommy Alderman
Sent: Monday, January 03, 2011 5:34 PM
To: [hidden email]
Subject: [Elecraft] 250hz Filter - Audio drops

This is driving me crazier!
My narrow filter is 250hz (FL4). FL4 cuts in when I change my DSP filtering
to 250 hz, as it should. FL4 stays in as I make DSP more narrow, all the way
to 50 hz.
The problem is that when I change DSP from 150hz to 100hz or to 50hz, my
audio output seems to drop tremendously, to the point I have to increase the
AF gain to hear the intended signal. The audio does not come back to
'normal' level until I change DSP from above 100hz bandwidth.
I have FL4 set for 2dB gain; FL4 FRQ set to 0.00.
Would appreciate any suggestions to fix this as I hope it is not 'normal'
operation?
Tom - W4BQF

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Barry N1EU

Re: 250hz Filter - Audio drops

Tommy Alderman wrote

I did have RX EQ with everything set for 0dB except for 400 and 800 hz, which I have set for
+8 and +16, respectively.

Just to be clear: did you try clearing RX EQ so ALL settings are at 0, and then see if you still have the drop in AF output at 50 & 100hz dsp width? That's what you need to do.

Barry N1EU

Chester Alderman

Re: 250hz Filter - Audio drops

Hi Barry,

Yes, I did reset Rx EQ back to zero and it had no affect on the 50hz and
100hz audio drop.

To my (somewhat) surprise, I went back to Rx EQ and made these settings:

50= +10
100= +10
200= 0
400= 0
800= 0
1600= 0
2400= -10
3200= -14

And now, the audio level is constant from across FL3 and FL4! Not sure why,
but this now works.

HNY -

Tom - W4BQF

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Barry N1EU
Sent: Monday, January 03, 2011 6:56 PM
To: [hidden email]
Subject: Re: [Elecraft] 250hz Filter - Audio drops

Tommy Alderman wrote:
>
> I did have RX EQ with everything set for 0dB except for 400 and 800 hz,
> which I have set for
> +8 and +16, respectively.
>

Just to be clear: did you try clearing RX EQ so ALL settings are at 0, and
then see if you still have the drop in AF output at 50 & 100hz dsp width?
That's what you need to do.

Barry N1EU

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