[Elecraft] VCO Alignment on K2 7109

[Don Wilhelm]

  Ed,

You seem to have run out of adjustment range on L30.

You will have to change the turns spacing on T5 to produce a voltage at 
R30 that is within range.

Since your R30 voltage is 8 volts, when tuned to 4000 kHz, tune to a 
lower frequency so that the voltage is something less than 8 volts.

Once you have done that, alter the spacing on T5 to reduce the voltage 
even further - adjust until the voltage is at something like 5.5 volts - 
then adjust L30 to bring it up to 6.00 volts when tuned to 4000 kHz.

Once the R30 voltage is set at 4000 kHz, check the ends of each band to 
be certain the voltage is within range for all bands.  If it is not, you 
may have a capacitor problem in the VFO Range Select area (ask about 
that problem specifically).

73,
Don W3FPR

On 6/4/2011 10:09 PM, EMD wrote:
> All,
>
> I have mad it to page 64.  When I check the volts at R30 using my DMM I get
> 8 volts. I assume that the left side of R30 would be having the front of the
> radio facing me so the lead I tested was towards adjacent the side panel.
> It did drop to 7.5v but at that reading the L30 was at what appeared to be
> it's maximum travel limit toward the top of the can.
>
> I searched the reflector and have found that I have 4.0 volts at U6 pin 5.
> I have 16 turns of red and 4 turns of green wire on T5.  When I decrease the
> frequency from 4000kHz the voltage does drop.
>