FW: [Elecraft] K2 Alignment

[Dan Barker]

View this in a fixed font, or it's gonna look BAD.

Mode   FL1     BF1   FL2     BF2   FL3     BF3   FL4     BF4
CWn    1.5   13.70   1.0   13.52   0.6   13.41   0.3   13.33
dm             .60           .42           .31           .33=20
CWr          14.55         14.83         14.70         14.58=20
dm            -.15           .53           .40           .38=20
LSB    2.2   13.60         13.90         13.90         13.90    =20
dm             .70           .90           .90           .90
USB          15.60         15.60         15.20         15.10
dm            -.80          -.40          -.30          -.20=20

dm=3DDelta Manual example on pps 86.

Or in other words, quite a bit. The radio is unusable with "book specs". =
The passband falls to near zero around 1K, and I'm aiming for a .6 KHz =
Offset. Moving BF1 to show 0.2-2.0 on Spectrogram makes it all sound =
clean (on CW, anyhow). I set each filter to straddle the 600 Hz mark in =
Spectrogram using background noise, zero beat WWV on wide, and fine =
tuned for the same tone on each filter. It never took much. This K2 =
hears magnificently. Kudos to Elecraft. As to Sideband, I've not a clue. =
There's no "tone" to tweak towards, and it all sounds like Mickey Mouse =
anyhow.

As to your suggestion to start over, I've done that, multiple times. Of =
course, the missing steps are easy to overlook. I don't know if they =
matter at all or are important. So, when I'd finish the CAL PLL step the =
wrong band, 30 M (where I was zerobeating WWV), I'd have to do it over =
on 40 M (because the book's eratta sheet said so) just to be sure. Then =
reset the BFO's to the book specs, then back to Spectrogram, then back =
to 30 M to see WWV. I can't believe the CW setup is so easy and the SSB =
is so tough to tune. There are references in the Spectrogram =
instructions not to "let the BFO frequency inside the filter passband", =
whatever that means (I know what it means, I just don't know how to =
determine it's happened).

But I KNOW when I'd return to the CAL FIL after finishing and then =
noticing that sideband was not working, the LSB numbers would be in the =
high 15's, and USB in the high 13's, even tho I'd set them the other way =
around. Either I did it wrong about 4 times in a row, or the CWr =
flummoxes the LSB CAL FIL process. Anyhow, the final time through, I =
mentally added the two necessary steps in K2ManRevC, in addition to the =
two errata on pps 98:

page 86 (CAL FIL Example):

  Step 8.5 Switch back to CW Normal by hodling CW Rv before proceeding =
on to LSB settings.


page 98 (Calibration to WWV):
=20
 Step 7.5: BAND +/- to 40 Meters. (I know it's in the text on step 8. to =
"Re-run CAL PLL on 40 m only", but I kept missing it. A separate step =
makes it easy to remember.


Note to Elecraft. If you guys want to try to duplicate this, I probably =
skipped the beginning of step 9. "Tab BAND+ to return to the filter =
bandwidth display". You can change modes with the display set to Freq., =
and I most likely did that. Could that possibly matter?=20

You guys do read these posts, no?

Dan Barker
WG4S / K2 #2456


=20


-----Original Message-----
From: Ken Wagner, K3IU [mailto:k3iu@arrl.net]
Sent: Wednesday, January 23, 2002 10:30 AM
To: Dan Barker
Subject: Re: [Elecraft] K2 Alignment


At 09:22 AM 1/23/02, you wrote:
>However, the SSB filters came out all wrong about 4 times. I finally=20
>noticed that they were reversed.

Hi Dan:
I'm not sure exactly how you got to the place that you are with the  =
filter=20
alignment. However, I'm SURE that if you follow the directions in the=20
manual for the initial setup, you will not be that far off. You =
commented=20
that your CW settings were fairly far off of the manual recommended=20
settings. I guess I'm wondering... "How far??". I just checked my =
settings=20
for FL2(1.0khz), FL3(0.4khz), and FL4(0,1khz). (I've got FL1 set up =
using=20
the SSB board filter for general tuning so I haven't included  FL1 =
data).=20
These are my readings. Oh... I am using firmware version 2.01f. With=20
respect to the Normal/Reverse function, I'm fairly confident that =
nothing=20
changed from the original firmware.

Filter / Normal or Reverse / BFO Freq in manual / BFO Freq in my K2

FL2 / Norm / 4913.1 / 4913.31 (Manual initial setup is for 0.7khz, mine =
is=20
1.0 khz)
FL2 / Rev / 4914.3 / 4914.34
FL3 / Norm / 4913.1 / 4913.16
FL3 / Rev / 4914.3 / 4914.28
FL4 / Norm / 4913.0 / 4913.07
FL4 / Rev / 4914.2 / 4913.23

If your settings are more than a couple hundred hz different than the =
book=20
values for a CW-only K2, you might consider starting again at Step =
One...=20
i.e., band less than 15 meters, CW normal mode, then reverse, then LSB,=20
then USB. Once you get these set up initially, then you can go to=20
Spectrogram for the fine tuning.

Good Luck.
73, Ken K3IU K2 #920