[Boatanchors] HRO 60 alignment problem.... solved

[Pete Williams]

.....checking the  alignment  of  some  coil boxes.. I  found the   GC  on
a 14 - 30  MHz   box  A---- I have  2 if them-- must have  a problem in
the  oscillator  box #4.  There  was no  way the frequency would  move
high  enough to  enable   the  WWV  on 15 Mhz  to  tune  to  the
injection  freq of   around  17 MHz.
My other box  A was   fine   and  even exchanging  the   osc.  box 4
proved  the original  diagnosis  justified.
I  should  add that it  was possible to  monitor the  injection  frequency
with the  simple  expedient of  connecting my freq counter  via a X  10
probe to  the  osc  trimmer...  the  frequency  not  that  accurate  as
capacitance in the  probe lowered freq  but  gave a ball park figure  that
could  be  corrected  when  the  fault found  and  fixed.
So  dismantling  and  comparing  both coil  box #4  revealed the
truth.....all  components  compared  similar   xcept the  coil  on the
suspect  box  had  4  turns instead of  the 3  turns  on the working  one.
Further investigation showed the  part  number  stamped on the  coil
former and  checked  with the  parts list  showed it  was  for a coil box
B - 7-14 MHz  ! !
With nothing to lose,a turn  was removed at the end  furtherest from the
tapped connection, reassembled. and  now  had  no  trouble  getting
injection   correct  and   a   functioning  unit.
Why some  previous user  made  the  change  is  unknown.
Cheers

Pete   VK3IZ