[Elecraft] K2 #2894 complete, need some help tho

Wed Nov 6 17:05:00 2002

Light bulbs are not a good dummy load.  Their impedance is not easy to 
determine, and it changes with the load, since it changes with how hot the 
filament gets.  So even if you measure it cold and get 50 ohms at the 
desired frequency (which you won't), it won't be that impedance once you 
hit it with 20 watts.

best wishes,

dave belsley, w1euy

--On Wednesday, November 6, 2002 4:32 PM -0800 ZOOM 
<[email protected]> wrote:

> Now how about using an incandesant light bulb for a dummy load?  They
> seem to work quite well for a temporary dummy load and exhibit near 50
> ohm impedance.  A quick load if you need one.  Any thoughts?
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Andrey Stoev
> Sent: Wednesday, November 06, 2002 9:12 AM
> To: [email protected]
> Subject: [Elecraft] K2 #2894 complete, need some help tho
>
> Hiya! I just completed my K2 #2894!
> Now i need to build a dummy load and then ill proceed with the alignment
> in part III.
> The kit is simply awsome! I am very impressed with the quality of all
> components and the design.
>
> Two things i am having problems with so far - (the K2 passed the
> alignment in part 2 and everything was as specifyed in the manual).
> First i am trying to do more accurate alignment of the 4MHz oscilator
> with C22 and using the 10 MHz WWV . The K2 is hoked to a dipol for 10
> meters. When i am in USB or LSB mode (and the widest filter - XFIL1) i
> can hear the carrier and zero beat it, but even then i can not hear the
> voice messages just before the end of each minute. I can hear the minute
> beep tho. Also the signal seems to be VERY weak (about S1-S2). The
> pre-amp dosnt help much. (I am able to hear WWV loud and clear at 10 Mhz
> using my Sangean ST-909 just with the standard whip). Another SW station
> located at 9.985 Mhz sounds better (when zero-beated) but again very
> weak and not as clear as on the ST-909. Could be something wrong with my
> receiver? (There is a definate jump in the noise bkg with the antenna on
> and off)
>
> The second thing is when i rotate the vfo dial to scan thru the
> frequencies, from time to time i can hear a "pop" and the s-meter jumps
> briefly to S5+ (even with the antenna disconnected). When i change the
> step to and start scaning slowly i can narrow the "pop" to a change
> between certain frequencies (10Hz step), but the "pop" occurs only
> during the change (its not like a signal that i am going thru very
> fast). There are few places wirthin the 40 m and 20 m bands where this
> occurs. ( I still dont have time to check the other bands)
> Any help will be appreciated!
>
> Thanks and 73's.
> A.Stoev
>
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----------------------------------
David A. Belsley
Professor of Economics