K3 - RTTY on 30 meters

[John E. Reiser]

Hello out there,

Yesterday a friend asked me to give him a contact on 30-meter RTTY.  I had never been on 30-meter RTTY before, but I agreed to give it a try.  But then I found that my K3 had no RTTY modulation_  just a carrier on 30-meters.  The T-R switching worked fine.

Let me explain that I have been using my K3 without a hitch in RTTY mode for the past two years on the 20, 15, and 12 meter bands, and it continues to work fine on those bands.

My K3 is # 384 running FW 3.97/2.58.  I simply have two stereo audio cables connecting the speaker and mike jacks on my notebook computer to the K3's line in and out jacks.  T-R switching is via the K3's RS232 jack and my Keyspan USB-Serial adapter.  My 30-meter antenna is resonant, with 1.2-1 VSWR across the entire band.  RTTY software is MMTTY.

The other odd thing that I observed was that my friend's signal was reversed on 30-meters.  That is, I couldn't decode him without invoking the reverse button in MMTTY.  I later had a QSO with him on 20-meter RTTY, and he was not reversed on that band.

Any ideas?

Many thanks and 73,

John, W2GW

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[Iain MacDonnell - N6ML-2]

Hi John,

You didn't say what mode and data sub-mode the K3 was in. It sounds
like you may have been in the "FSK D" sub-mode where you wanted to be
in "AFSK A", based on the facts that you heard a "carrier" when
transmitting and that you mentioned audio cables as your interface.
Data sub-modes are remembered per-band.


That doesn't quite explain the reversed tones, though... unless you're
actually setup to use "DATA A" mode on other bands, which is upper
side-band-like.

    ~Iain / N6ML


On Tue, May 18, 2010 at 8:05 PM, John E. Reiser <[hidden email]> wrote:

> Hello out there,
>
> Yesterday a friend asked me to give him a contact on 30-meter RTTY.  I had never been on 30-meter RTTY before, but I agreed to give it a try.  But then I found that my K3 had no RTTY modulation_  just a carrier on 30-meters.  The T-R switching worked fine.
>
> Let me explain that I have been using my K3 without a hitch in RTTY mode for the past two years on the 20, 15, and 12 meter bands, and it continues to work fine on those bands.
>
> My K3 is # 384 running FW 3.97/2.58.  I simply have two stereo audio cables connecting the speaker and mike jacks on my notebook computer to the K3's line in and out jacks.  T-R switching is via the K3's RS232 jack and my Keyspan USB-Serial adapter.  My 30-meter antenna is resonant, with 1.2-1 VSWR across the entire band.  RTTY software is MMTTY.
>
> The other odd thing that I observed was that my friend's signal was reversed on 30-meters.  That is, I couldn't decode him without invoking the reverse button in MMTTY.  I later had a QSO with him on 20-meter RTTY, and he was not reversed on that band.
>
> Any ideas?
>
> Many thanks and 73,
>
> John, W2GW
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[John E. Reiser]

Hi Chen, W7AY,

Exactly right!  Thank you!

I knew it had to be something I forgot to set correctly.  Will have to
remember that data modes are per-band on the K3.

Vy 73,

John, W2GW


----- Original Message -----
From: "Kok Chen" <[hidden email]>
To: "John E. Reiser" <[hidden email]>
Sent: Tuesday, May 18, 2010 4:48 PM
Subject: Re: [Elecraft] K3 - RTTY on 30 meters

> The K3 mode is band-dependent.
>
> If you are using MMTTY in AFSK, you need to set the K3 mode on 30m to
> DATA-A or AFSK-A.  It sounds almost like (single unmodulated carrier) you
> have set the 30m mode to FSK-D.
>
> Vy 73
> Chen, W7AY
>
>

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