[Elecraft] K2 w/KSB CW reverse BFO

Thu Oct 31 09:52:00 2002

Hi

Here is the procedure that is in the instructions for the noise generator=
 kit I have for sale:

It=E2=80=99s not that hard to get everything close to perfect if you will=
 spend a little time with WWV, Spectrogram and your noise generator. This=
 is the method I use to align a K2:
 =20
The first thing is to make sure the K2 is on frequency you can check that=
 by looking at WWV with Spectrogram looking for the 500 and 600 Hz tones =
on alternating minutes (you may need to wait a little, the tones are not =
on all minutes of the hour). Use USB or LSB mode. Set up a marker at 500 =
and 600 Hertz on the Spectrogram display. When you have the tones on the =
spectrogram markers, read the VFO frequency and write it down. Connect th=
e frequency probe to TP3 in FCNTR mode and adjust C22 on the control boar=
d to change the indicated frequency by the amount needed to make the VFO =
correct. Here is an example: if the VFO is reading 20 counts high then ch=
ange the frequency at TP3 20 counts lower (note: the frequency at TP3 wil=
l be around 12 MHz not the VFO frequency). Move the counter probe to TP1 =
and select 40 meters and run CAL PLL. This should put your VFO on frequen=
cy. Recheck against WWV and repeat if necessary.
 =20
Then use Spectrogram and your noise generator to set up your filters. Pre=
set them to the settings in the K2 manual first so you are sure you are o=
n the right side of the band-pass then adjust the filters with Spectrogra=
m to center the band-pass on a marker set at your side-tone frequency. Th=
e noise generator connected to the K2 antenna makes it easier to see the =
band-pass. You may need to do all of the above more than once to get ever=
ything right. When setting up sideband move the band-pass so the lowest p=
oint on the skirt on the left starts just a little past 0 Hz. Set each fi=
lter trying to duplicate that left hand skirt. You may need to adjust the=
 K2 volume control for the best display. =20
 =20
If you would like to check out your K2 filters here is a quick way to mak=
e sure you have it right. Set the band to 80 meters and set the VFO to 40=
00.00 select CW mode and FL1. You should hear the MPU 4.00 MHz clock as a=
 600 Hz tone assuming your side tone is set to 600. If not adjust the VFO=
 a little to zero beat with the spot tone. Now cycle through the filters =
FL1-FL4. The frequency should not change at all or very little. Now witho=
ut touching the VFO frequency hold the CW REV button to select CW reverse=
. Again the tone should not change with the reverse or when cycling throu=
gh the filters.
 =20
Now switch to USB mode and change the VFO to 3999.40 and you should hear =
the same note. Cycle through the filters and it should not change. Change=
 to LSB and set the VFO to 4000.60 and you should hear the same 600 Hz no=
te when cycling the filters. If it will do all of the above then you have=
 got it set as good as it gets.   =20
                                                                         =
                                  =20
 Don Brown, KD5NDB

----- Original Message -----
From: VR2BrettGraham
Sent: Thursday, October 31, 2002 2:18 AM
To: [email protected]
Subject: Re: [Elecraft] K2 w/KSB CW reverse BFO

Thanks to N0SS, KC4KGU, W3FPR & K6SE for their replies.

Provided everything is set up right & the signal tuned in properly, =20
toggling between
CW & CW reverse modes should result in no or little change in the tone of=
 the
received signal.

My particular K2 appears to have some BFO crystals way out in left field,=
 so
until a CARE package arrives from Elecraft, I shall live with my best "by=
 ear"
tweaks.  There may also be some contribution to the problem by the US Pos=
tal
"Service" - radio is not sounding on arrival to me as it did for the =20
gentleman who
sent it to me.

73, VR2BrettGraham

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