[NLRS] Sick 736

[Chris Elmquist]

On Monday (07/31/2006 at 10:31PM -0500), John Oehlenschlager wrote:
> 
> 
> My Yaesu 736 is acting very strange with a number of "birdies" on 2 and 
> 432. They occur about every 10 to 15 khz.  Any suggestions?  The operators 
> manual and the detailed maintenance manual are about as useful as congress. 
> Any help would be appreciated.

I am getting birdies on my 736 which are being conducted into the PTT
control jack on the back of the radio (the DIN plug that carries all four
PTT signals from each band module) via (soon to be changed) unshielded
cable that connects to the PTT inputs of my external amplifiers.  This
cable is picking up RFI from nearby computer equipment and conducting
it into the radio that way.  It doesn't come in via the antenna jacks
because I have terminated those with 50 ohm and the birdies are still
there, strong as can be.  Disconnecting this PTT control cable, kills
the birdies.

Jerry's point about power supply noise is good too.  That seems like a
reasonable rate for an (older) switching supply.  It is also a reasonable
rate for video so you could look for something coming out of a computer,
VCR, cable TV system, etc.

Good luck!

Chris NØJCF

-- 
Chris Elmquist
mailto:chrise at pobox.com