On Jul 13, 6:52 am, " wrote:
On Jul 13, 7:32 am, Ancient_Hacker wrote:

Trying out this WJ tuner, it's supposed to tune 0.9 to 10 MHz and
convert it to their standard IF of 21.4 MHz. Works wonderfully.
Sensitive anyway. But the frequency readings are way off-- about 8
percent low on the low end, 12 percent low on the high end. So when
the filmstrip dial says "10.0" you're actually listening to 8.8 or
so.
Normally I'd go tweak what every other SW radio has- a coil slug or
big series padder for the low end, a small drifty mica compression
trimmer for the high end.
Any hints appreciated.

Couple of questions:

Does it let you tune all the way to/from 0.9 to 10.0 (off the dial of
course)?
Or, is the entire band shifted downwards?
Or, chopped off at each end?
Does it look all OEM?

It's not a constant difference, it's just maddeningly from 8 to 12
percent low. So it's not slipped dial couplings or tuned up on the
wrong side of the LO.


And the calibration sticker is broken on one of the 72 screws keeping
the VFO cover from flying off. But everything in there looks OEM,
good and untouched.

Guess I'll try fiddling with the coil slug, but like Vilma says on
Scooby-Doo, when entering a haunted house, "I don't have a good
feeling about this"

Maybe another clue, for a fancy dual-conversion radio the image
rejection is very poor, not more than 25db it seems. Odd.