[Elecraft] Any K2/100 CW/SSB users with an Oscilloscope?

Thu Aug 15 11:51:00 2002

Hi

I agree with George Your ALC is not working

I connected my K2/100 to an Autek WM1 peak reading watt meter and set the=
 output for 50 watts on CW into a dummy load then changed to SSB mode and=
 I could not make the peak reading go above 50 watts no matter how loud I=
 talked or whistled. This is what I would expect a properly ALC circuit t=
o do. You may want to check the setting of R26 in the KPA100 watt/SWR met=
er circuit. The setting is critical for proper operation of the ALC. Most=
 of the time the problem is the external watt meter used to calibrate the=
 KPA100 is off so the KPA100 is off also. Try backing off the drive a lit=
tle by turning R26 clockwise!! a little at a time to see if the ALC works=
 a little better. If this improves the ALC action try calibrating R26 at =
50 or 100 watts instead of 10 watts. Make sure your external wattmeter is=
 accurate. A little movement of R26 makes a big change in the power out a=
nd the current draw. This pot works opposite from the way you would expec=
t. Clockwise reduces drive and counterclockwise increases drive.

Don Brown
KD5NDB =20

----- Original Message -----
From: George, W5YR
Sent: Thursday, August 15, 2002 10:12 AM
To: [email protected]
Cc: [email protected]; [email protected]
Subject: Re: [Elecraft] Any K2/100 CW/SSB users with an Oscilloscope?

Don't have a K2, et al, but sounds like your ALC is not functioning. With
proper ALC action, the r-f envelope on SSB should not - actually could no=
t
- exceed the power limit set for CW operation. I am speaking in terms of =
my
non-Elecraft radios since I have not looked at a K2 output with a scope, =
as
I do with my other rigs.

Hope this is of some help but my lack of experience with Elecraft equipme=
nt
is showing! <:}

73/72/oo, George W5YR - the Yellow Rose of Texas         =20
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   =20
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437

[email protected] wrote:
> =20
> I would like you to try this test:
> =20
> *Hookup your K2/100 to a 50 ohm dummy load.
> *Set the K2/100 for CW mode.
> *Place a scope (probe) across the dummy load.
> *Set the K2/100 for 50 watts, and transmit into the load.  Take a refer=
ence
> of the peak-to-peak
> amplitude on the Oscilloscope (it should be around 144Vpp, which is 50
> watts).
> *Now, place the K2/100 in SSB mode.
> *Key the microphone, and speak into it in a normal voice.
> *What is the peak-to-peak amplitude on the scope?  It should go no furt=
her
> then the pp amplitude in
> CW... but mine K2/100 goes to 218Vpp!  On my Mark-V rig, it goes no fur=
ther
> than it does during
> CW...
> =20
> Thanks,
> John
> N2KBE
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