[RTTY] N1MM + KENWOOD Radio Control = Chirp..??

[Robert Chudek - K0RC]

Mike,

There was a problem with the TS-950SDX firmware in its early version 
that caused a rhythmic pulsing in the transmitted signal when CAT 
control was being used. This was noticeable on SSB, although this is the 
first I have heard of that problem using FSK. But that is one thing I 
would suspect with your description of what  you are experiencing.

A firmware update was issued which resolved the problem. I don't know 
whether the PROM is still available from Kenwood, but I  see someone is 
selling this chip on eBay:

http://cgi.ebay.com/Kenwood-TS-950SDX-Latest-Prom-update-/200586831978

And here's a link to the instructions for replacing the chip:

http://my.bresnan.net.bresnan.netw.ham.dmz.ro/kenwood/ts-950sdx-wk1ea-ver-8-program.php

Although this ASB-1003 Service Bulletin references a problem with the 
K1EA CT program (shows you how old this issue is), it doesn't fully 
describe the symptom of the pulsing noise in the audio. It reports an 
"unkeying" of the transmitter, although I never experienced that 
problem. The key though, is that disabling the CAT control makes the 
noise go away. I am only aware of this because it was a fault with the 
first TS-950SDX I purchased, way back when.

While researching this topic I found another thread that has a link to 
an MP3 file that illustrates what the "problem" sounds like. It's in the 
post from PD9FER, near the bottom. That message string is over a year 
old and I don't see a resolution posted, only references to ferrite on 
the CAT lines. This won't fix the problem because the source of the 
problem was an internal issue with interrupts of the CPU getting fed 
into the audio system.

http://forums.ham-radio.ch/showthread.php?19296-Distortion-in-the-TS-950SDX-Xmit-Audio-if-HRD-is-running

73 de Bob - KØRC in MN

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On 4/3/2011 1:20 AM, Michael Haack wrote:
>  Bob,
>
> I'm running N1MM on RIGBLASTER PRO in a TS950SDX  running FSK.
> The Rigblaster running on a USB /serial interface.
> The Com to Radio a W1GEE cable interface on a USB/serial interface.
>
> What I believe I'm seeing/hearing is the Radio Com port interfering 
> with the FSK signal.
> It is not constant during transmissions but rather rhythmic 4 or 5 
> chirps then a period of "normal" transmission with repeats every 
> several seconds.
>
> It occurs if I enable the "rig interface" and TX through N1MM/Rigblaster.
> It occurs when the "rig interface" is enabled, even if I simply press 
> the "send/receive" button on the TS950SDX.
> Which is what is making me lean toward "rig control" rather then 
> signals from the Rigblaster.
>
>
>
>
>
>
> On 04/02/2011 8:11 PM, Robert Chudek - K0RC wrote:
>> Mike,
>>
>> Are you using FSK or AFSK? What is your interface?
>>
>> 73 de Bob - KØRC in MN
>>
>>
>> On 4/2/2011 8:04 PM, Michael Haack wrote:
>>> Hey all,
>>>
>>> While playing a bit in the EA RTTY contest earlier, I got a comment or
>>> two of my signal sounding chirpy.
>>>
>>> A little investigation reveals that its only there when I using the 
>>> "RIG
>>> Control to radio"
>>> The sound is that of a bird chirping. And I see output power
>>> fluctuations at that same time.
>>>
>>> It is _NOT_ on the signal when I turn off the Rig Control.  Even at 
>>> Full
>>> output.
>>>
>>> Is this a Setting issue with the Rig interface/ Polling??
>>>
>>> The Software: N1MM
>>> The Radio: Kenwood TS950SDX
>>>
>>> Ideas...???
>>>
>>> Thanks, 73
>>> MIKE, WB9B
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>
>