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KX3 - AFSK RTTY

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jh3sif

KX3 - AFSK RTTY

I have been trying to set up for RTTY operation with KX3 + iMic + cocoaModem on Macbook Pro, but not successful.
Mode selection on KX3 is AFSK A and cocoaModem setup is matched to the KX3 setting.
RTTY signal received by KX3 appears not around 2125Hz but around 900Hz. So, I set cocoaModem’s mark frequency to 915Hz. With that setting, decoded text appears on the screen. KX3 VFO is properly tuned to the signal, of course.
When FSK D on KX3, all is same. RTTY signal appears around 900Hz as well.

I found this had been discussed several years ago in the ML, but no change in KX3 specification since then.
I would like to know if this mark frequency is OK in QSO with other RTTY station.

73 de JH3SIF, Keith

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Don Wilhelm

Re: KX3 - AFSK RTTY

Keith,

The other station will not know what mark frequency you are using. The
only thing the other station hears is your mark and space frequencies
(and the resultant shift), so if you are using the proper RTTY shift, he
should copy you with no difficulty.

Yes, there are some folks who are reluctant to use low tones with RTTY
because the 2nd harmonic of that tone falls within the SSB bandwidth. I
would suggest you ignore those comments - the KX3 works fine with the
lower tones.

I am not certain what you meant about FSK D - you should be using AFSK
A, so FSK D is not relevant. I do not do Mac and I do not do CocoModem,
so this may be some mixture of settings between the KX3 and CocoModem
that do not make sense to me.
Does CocoModem support soundcard RTTY? That is what you should be
using, no matter what CocoModem calls it.

FSK D mode with the KX3 is used to send RTTY from CW paddles (not
computer input - the KX3 must see the dots and dashes directly from the
paddles). An alternative to the paddles for FSK D input is a software
application that can send "KY" commands with ASCII text. Few
applications other than KX3 Utility have that capability.

73,
Don W3FPR

On 3/28/2017 8:04 PM, Keith Onishi wrote:
> I have been trying to set up for RTTY operation with KX3 + iMic + cocoaModem on Macbook Pro, but not successful.
> Mode selection on KX3 is AFSK A and cocoaModem setup is matched to the KX3 setting.
> RTTY signal received by KX3 appears not around 2125Hz but around 900Hz. So, I set cocoaModem’s mark frequency to 915Hz. With that setting, decoded text appears on the screen. KX3 VFO is properly tuned to the signal, of course.
> When FSK D on KX3, all is same. RTTY signal appears around 900Hz as well.
>
> I found this had been discussed several years ago in the ML, but no change in KX3 specification since then.
> I would like to know if this mark frequency is OK in QSO with other RTTY station.
>
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jh3sif

Re: KX3 - AFSK RTTY

Thanks, Don.
I checked the transmitted signal with other TRX. No second harmonic was detected.

Yes, cocoaModem supports sound card RTTY. iMic is a USB audio device.

73 de JH3SIF, Keith

> 2017/03/29 9:37、Don Wilhelm <[hidden email]> のメール：
>
> Keith,
>
> The other station will not know what mark frequency you are using. The only thing the other station hears is your mark and space frequencies (and the resultant shift), so if you are using the proper RTTY shift, he should copy you with no difficulty.
>
> Yes, there are some folks who are reluctant to use low tones with RTTY because the 2nd harmonic of that tone falls within the SSB bandwidth. I would suggest you ignore those comments - the KX3 works fine with the lower tones.
>
> I am not certain what you meant about FSK D - you should be using AFSK A, so FSK D is not relevant. I do not do Mac and I do not do CocoModem, so this may be some mixture of settings between the KX3 and CocoModem that do not make sense to me.
> Does CocoModem support soundcard RTTY? That is what you should be using, no matter what CocoModem calls it.
>
> FSK D mode with the KX3 is used to send RTTY from CW paddles (not computer input - the KX3 must see the dots and dashes directly from the paddles). An alternative to the paddles for FSK D input is a software application that can send "KY" commands with ASCII text. Few applications other than KX3 Utility have that capability.
>
> 73,
> Don W3FPR
>
> On 3/28/2017 8:04 PM, Keith Onishi wrote:
>> I have been trying to set up for RTTY operation with KX3 + iMic + cocoaModem on Macbook Pro, but not successful.
>> Mode selection on KX3 is AFSK A and cocoaModem setup is matched to the KX3 setting.
>> RTTY signal received by KX3 appears not around 2125Hz but around 900Hz. So, I set cocoaModem’s mark frequency to 915Hz. With that setting, decoded text appears on the screen. KX3 VFO is properly tuned to the signal, of course.
>> When FSK D on KX3, all is same. RTTY signal appears around 900Hz as well.
>>
>> I found this had been discussed several years ago in the ML, but no change in KX3 specification since then.
>> I would like to know if this mark frequency is OK in QSO with other RTTY station.
>>

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Fred Moore-2

Re: KX3 - AFSK RTTY

In reply to this post by jh3sif

Keith, I have been on unix for the last 30 years, and fought with
cocoModem for about 3 months, and finally came to the conclusion that it
is not ready for prime time. I would get it working for several weeks,
then it would quit.. I never got it to talk to my logging program even
with applescript, finally I moved to fldigi with logging and rig control
coming from rumlogNG and have never looked back... This gives more modes
than cocoModem supports..

I use both a signalink, and a small 7 dollar usb sound card depending on
my location (home/portable). I could use the existing soundcard in the
mac, but just havn't build up a cable for that to work yet..

As others have said, you are only concerned about your tone spacing, not
the exact tones, the other end only sees space and mark tones..

feel free to contact me direct if you want to talk about the issues I had..

fwiw... regards.. Fred

Fred Moore
email: [hidden email]
[hidden email]
phone: 321-217-8699

On 3/28/17 8:04 PM, Keith Onishi wrote:

> I have been trying to set up for RTTY operation with KX3 + iMic + cocoaModem on Macbook Pro, but not successful.
> Mode selection on KX3 is AFSK A and cocoaModem setup is matched to the KX3 setting.
> RTTY signal received by KX3 appears not around 2125Hz but around 900Hz. So, I set cocoaModem’s mark frequency to 915Hz. With that setting, decoded text appears on the screen. KX3 VFO is properly tuned to the signal, of course.
> When FSK D on KX3, all is same. RTTY signal appears around 900Hz as well.
>
> I found this had been discussed several years ago in the ML, but no change in KX3 specification since then.
> I would like to know if this mark frequency is OK in QSO with other RTTY station.
>
> 73 de JH3SIF, Keith
>
> ______________________________________________________________
> Elecraft mailing list
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>
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