[Kenwood] TS850-DDSProblems?

Sat, 25 Oct 2003 14:24:57 -0500

Correcto Roger it is typical symptom of DDS failure! You might also notice
the monitor dead or intermittence there. Is the receiver alive? Sooner or
later the rest of them will go and the rig will de bead on TX/RX both.

You can buy the 66312s from Pacparts @ 28 USD each. Once you replace all 4,
it should be a fine radio. However, it is an expensive fix isn't it?
Precisely why no one should buy a used 2xxxxx 850s. Your owner, like the K9
in Greenbay, WI, who sold me his which quit a few weeks later, obviously saw
the warning bells!

Go to N6TR's webpage and read all about the 850. You might also want to do
the diode change and the rx protection mod. I am sure pacparts will have
that part as well.

73,
Ron, 6Y5/4S7RO

----- Original Message -----
From: roger clementz <[email protected]>
To: <[email protected]>
Sent: Saturday, October 25, 2003 11:52 AM
Subject: [Kenwood] TS850-DDSProblems?

> Hi,
> I bought a used early TS850S (ser.n.r2xxxxx) a couple off weeks ago. On
> startup the modulation on SSB sounded a bit
> like listening on the wrong side band but was ok after a couple off
seconds.
> It some times came after a couple of hours of
> activity but was ok after turning the power off and on again. The problem
> has escalated to the point where I now have no
> audio on SSB/CW, but it seems to be ok on FM and AM. Also the output power
> is gone! Have seen on the net, that this is
> mostly due to failure off the DDS chips (YM6631) on these early models. In
> my radio one off the four chips have been
> changed to the newer version YM66312. As these chips are quite expensive
> (abt $45 here in sweden) I'd like to here if
> some one has had this problem with their TS850 and if it behaved like mine
> does? Was the cure changing the YM6631's ?
> Help would be much appreciated as I would like to get this, otherwise
> fabulous, rig in the air!
>
> Regards
>
> SM7UYJ/Roger
>
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