[Elecraft] SSB cal fil problem

[Jerry Hancock]

I don't have a problem with dial calibration as much as not understanding
the operation of FL1 and FL2.  Setting the BFO to the same number for both
filters should give the same results, shouldn't it?

-----Original Message-----
From: George, W5YR [mailto:w5yr@att.net]
Sent: Monday, October 14, 2002 9:44 PM
To: jehancoc@pacbell.net
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] SSB cal fil problem

Comes with the territory, Jerry. A wonderful little radio but its dial
calibration and related features don't quite measure up to the overall
performance of the radio. But, despite that I have found no problems at all
in actually working stations with the K2.

My Icom PRO affords one Hz tuning resolution and is always within two Hz or
less of WWV, so a couple of years of that has spoiled me! But, once one
accepts that the dial calibration of the K2 is going to be great on 160 and
degrade as you move up in frequency, and differ for each mode, then you can
relax and enjoy working stations instead of worrying about dial settings!
<:}

So far, I have never failed to hear a station on the K2 that I can hear on
the PRO, and the overall quieter background noise of the K2 makes the
weaker signals seem even easier to copy that with the PRO.

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
In the 57th year and it just keeps getting better!
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
K2 #489      Icom IC-765 #2349     Icom IC-756 PRO  #2121


Jerry Hancock wrote:
>
> I applied both the SSB filter mods.  I am using OP1 for filter 1 and 2.  I
> have both BFO settings at 209.  I would assume that this would make both
FL1
> and FL2 the same.  When I zero beat WWV and watch the tones (as per an
> earlier post) I see the 500hz and 600hz tones at the correct place in the
> spectrum using sound forge spectrum analysis.  When I switch to FL2 with
the
> BFO settings at 209, the tones shift up about 39hz in the FFT.
>
> If I go back to CAL FIL and adjust FL2 to say 207, the spectrum display
> changes and I can get FL2 to match FL1 (as to the position of the tones).
> If I then exit FL2 and loop back to FL1, FL1 is correct.  Pressing XFIL
once
> to select FL2 and the BFO setting is at 207 but the tone is back where it
> was, 39hz off.  Setting the BFO for FL2 to 205 corrects it until I loop
back
> around again.
>
> If I change FL1 to 211 I can make the tone move and leaving FL2 at 209, If
I
> loop through the filters, it is ok.
>
> This happens on LSB on 14mhz.  The difference seems less on 40m.  I can
> leave the USB filters at the same BFO settings without an audio shift.
>
> So what gives?
>
> Thanks, I enjoy this radio to no end.