Also check to be sure there are no cracked cores in the interstage
transformers. Those are hard to find sometimes. If all stages tune
correctly then they might be ok. When the cores crack they detune the
coil they are in.

Mark Rehorst wrote:

I am trying to fix my recently and suddenly deaf SX-190 receiver and
can't seem to find the problem. I have a DMM, an uncalibrated sig
gen, and a 100 MHz scope available. Of course, I have schematics,
etc.

MR

On Fri, 31 Oct 2003 11:22:03 -0500, jim breeeyar
wrote:

Also check to be sure there are no cracked cores in the interstage
transformers. Those are hard to find sometimes. If all stages tune
correctly then they might be ok. When the cores crack they detune the
coil they are in.

I'll keep it in mind for future reference. My radio has been fixed-
it turned out the second mechanical filter had a bad solder joint.

Thanks,

MR

On Fri, 31 Oct 2003 11:22:03 -0500, jim breeeyar
wrote:

Also check to be sure there are no cracked cores in the interstage
transformers. Those are hard to find sometimes. If all stages tune
correctly then they might be ok. When the cores crack they detune the
coil they are in.

I'll keep it in mind for future reference. My radio has been fixed-
it turned out the second mechanical filter had a bad solder joint.

Thanks,

MR