[Elecraft] ref osc clicks, really bothers me

[W3FPR - Don Wilhelm]

William,

Re-check the PLL range on SN 4513 as instructed in the manual.  From the 
data you provided, I believe your range is too small - the minimum range 
should be 9.8 kHz, and yours appears to be only 4.05.  Yes, the first thing 
to try is changing L31 to 12 uH.  Also check to be certain you have the 
correct varactor diodes installed, and that they are correctly oriented. 
Also be certain the signal path from U6 pin 1 to D16 and D17 has good solder 
connections at all points including R19 and RP2 - a bad solder joint along 
that path will result in inadequate PLL range.

Re: the slight clicks on SN 4514 --
Noticable clicks when tuning is commonly a result of running CAL PLL without 
the bottom cover installed.

Run CAL PLL again.  Be certain the bottom cover is properly installed before 
running and the 'clicks' should be reduced to almost non-existant.

73,
Don W3FPR

----- Original Message ----- 
> 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
>
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