Michael,

Have you tried a cpu reset?  Maybe it won't help, but worth a try.   If it 
is similar to other Kenwood's I have owned, the procedure is to turn off the 
radio, press and hold in the a/b or a=b vfo button(I forget which), and 
while pressing in this button turn on the power then release the button.


I think it could be the pll  or something else going bad but coming back to 
life as  temp rises.   Cold solder joints on various boards are a  known 
fault in Kenwood rigs of that era.

With the price of new rigs, or even good used ones, it should be  worth 
having someone take a look at it, especially since you like it so much.
  Some guys keep their gear on 24/7 and while this may  help in the short 
term, won't fix any  hidden problem.
73, Steve KW3A

----- Original Message ----- 
From: "Michael Ryan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, August 31, 2009 10:48 AM
Subject: 2ND or 3RD opinion


> Hi All:
>
> The center piece of my HF station is a Kenwood TS-940SAT, 1987 vintage
> and I'm the 3RD owner.
> Well, for the past 2 years or so, when I 1ST power up, it takes about
> 30MIN for the rig to settle down and behave normally.
> During this 30MIN time period, the following are intermittent: my
> display blinks in and out, no transmit pwr, no internal ATU function,
> and intermintened audio. The only things that aren't intermittent, is
> the sound of the rig that sounds like there's no antenna attached and
> VS unit announcement of the freq. The VFO and modes can be changed but
> when you do, that's when the display blinks. When you turn any of the
> knobs and switches, the display blinks. All of this occurs for 30MIN
> and when I do have audio, I detect a ripple and crackley affects. I
> was told it may be the PLL board but don't think that would affect the
> power out or atu. Don't think it would inter-fear with the display
> either.
> I'm wondering if the 940 is worth investing in, parts are becoming
> harder to find, or retire it.
> I compared my 940 to another rig this past weekend and my 940 simply
> kicked it's backside once it settled down.
> Did you also know, that Inrad doesn't make any roofing filter mods for
> this rig because there was no improvements when experimental were
> used. They do make roofing filters for every other rig. LOL
> I think that's something to be said and I'd really hate to have to say
> goodbye.
>
> 73:
>
> Michael De VO1RYN
>