K-3 Ref Cal adjustment affected 400 hz 8 pole filter

[Art Suberbielle]

Performed the Reference Oscillator adjustment using Method 2. Discovered I was about 20 hz below 10.000. Got the adjustment completed and then noticed that when going from the 1khz bandwith to 400 hz filter the signal would drop down considerably. Opened Config menu and verified Filter 3 (400hz 8 pole) was turned On. Noticed that Filter FRQ was at zero. By adjusting the frequency to +0.25 it then seemed to perform as it had prior to the Reference Oscillator adjustment. Is this expected behavior?

Thanks in advance for the input.

73,

Art KZ5D  



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[Jim Brown-10]

On Sun, 15 Aug 2010 10:45:53 -0400, [hidden email] wrote:

> Is this expected behavior?

Yes, it appears to be within the normal tolerance of the filters. I have a
total of three 400 Hz filters and three 250 Hz filters between two radios
(one with a sub-RX). I've measured them all with a spectrum analyzer,  and
all require some offset to center them in the K3 IF, typically 40-100 Hz.

73, Jim K9YC



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[David Cutter]

Could the P3 or another sdr/panadaptor be used to do this alignment?

David
G3UNA


----- Original Message -----
From: "Jim Brown" <[hidden email]>
To: <[hidden email]>
Sent: Sunday, August 15, 2010 4:01 PM
Subject: Re: [Elecraft] K-3 Ref Cal adjustment affected 400 hz 8 pole filter

> On Sun, 15 Aug 2010 10:45:53 -0400, [hidden email] wrote:
>
>> Is this expected behavior?
>
> Yes, it appears to be within the normal tolerance of the filters. I have a
> total of three 400 Hz filters and three 250 Hz filters between two radios
> (one with a sub-RX). I've measured them all with a spectrum analyzer,  and
> all require some offset to center them in the K3 IF, typically 40-100 Hz.
>
> 73, Jim K9YC
>
>
>
> ______________________________________________________________
> 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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