[Elecraft] ref osc clicks, really bothers me

[wu yihan]

howdy,

after 20days works,i built my k2(4513#)and ksb2,knb2 and dsp option. it 
works as a whole,but it clicks and pops while i tune the VFO,every 5khz.

I know it is because of the constrution of PLL/VFO, move VFO over 5khz,the 
division ratio of PLL change and the reference osc and the varicap voltage 
goes to another end of the pulling range,but it sure be too loud,wihle VFO 
change at tuning rate of 1khz,it clicks and pops continuously of s-9,it 
really bothers me!

my friend,BD8EB's K2(4514#) clicks too,but more slightly,almost couldn't be 
felt in most condition,i took view with oscilloscope at TP3 both, it jump 
and flash with my k2 while the ref. osc got to the other end of pulling 
range across the boundary,but that didn't occur with 4514#.

below  is voltage and associated frequency of 4513# and 4514#:

4513#(click loudly)
 voltage at Pin1 ofU6:     0v      /3.27v    /7.16v   /8v           
requency of ref. osc(TP3): 12096.36/12095.00/12100.04/12100.41
 
4514# (silent)
voltage at Pin1 of U6:     0v       /3.46v  / 6.61v  /8v           
frequency of ref. osc(TP3):12088.78/12095.03/12100.09/12101.30

the middle two parameter(3.27v,7.16v,12095.00Mhz,12100.04Mhz) are the 
boundaries which rig works practically.

and i've check out soldering and  value of components,all seemed ok,what's 
the problem? will it work replace L31 with 12uH instead of 10uH ?

anyone who could helps me solve the  problem? and will be 
appreciated,thanks.

william/BG8AQA

wooyh at 21cn.com
2005-01-15

_________________________________________________________________
Ãâ·ÑÏÂÔØ MSN Explorer:   http://explorer.msn.com/lccn/