K2 - data mode r bar

[Bob Towers-3]

Oops, previous message should be:

How come data mode r bar is LSB when USB is the default for all bands and data modes? Shouldn't data mode r be USB, not LSB?

73

Bob
2M0KDZ
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[k3yt-2]

RTTY is LSB

K3YT
---- Bob Towers <[hidden email]> wrote:

=============
How come data mode r bar is USB when USB is the default for all bands and data modes? Shouldn't data mode r be USB, not LSB?

73

Bob
2M0KDZ
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[Bob Towers-3]

Are you sure RTTY is LSB?

Any time I've - mistakenly - set the rig to LSB and tried to copy RTTY, I've had to invert the signal to read it. On USB I don't have to do that.

I was also under the impression that all data modes are USB, irrespective of band... Certainly my experience so far.

73

Bob
2M0KDZ
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[k3yt-2]

I guess you are using software to decode.  And a lot of people
using sw to transmit.

RTTY is one of the original data modes.  As far as I know it was always LSB
using RTTY terminals and  later tnc's (or rather multimode controllers).

It does not really matter now with the software, but in the old days
that is the way it was.  You might still encounter people holding to the
convention of LSB.

That is why the K2 data mode has an "R" for RTTY and is LSB.

73 de Bob K3YT
---- Bob Towers <[hidden email]> wrote:

=============
Are you sure RTTY is LSB?

Any time I've - mistakenly - set the rig to LSB and tried to copy RTTY, I've had to invert the signal to read it. On USB I don't have to do that.

I was also under the impression that all data modes are USB, irrespective of band... Certainly my experience so far.

73

Bob
2M0KDZ

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[Bob Towers-3]

Yes, that's good enough for me, thanks.

I occasionally come across a USB RTTY signal which IS inverted and I wondered why. Now I know!

All my data stuff is via software, so I suppose I really ought to call my RTTY AFSK.

Thanks and 73

Bob
2M0KDZ
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[Phil Kane-3]

On Thu, 23 Mar 2006 16:46:28 +0000, Bob Towers wrote:

>All my data stuff is via software, so I suppose I really ought to
<call my RTTY AFSK.

  The commercial services have been using AFSK "modems" for
  multi-channel telegraph/data (MUX) for at least the last 40 years
  that I am familiar with.

--
   73 de K2ASP - Phil Kane

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[Nick Waterman]

Phil Kane wrote:
>> All my data stuff is via software, so I suppose I really ought to
>> call my RTTY AFSK.
>
>   The commercial services have been using AFSK "modems" for
>   multi-channel telegraph/data (MUX) for at least the last 40 years

Look at it this way... It's really just another IF, isn't it?

--
"Nosey" Nick Waterman, G7RZQ, K2 #5209.
use Std::Disclaimer;    [hidden email]
IBM: Interesting But Mundane
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[Bill Coleman-2]

On Mar 23, 2006, at 9:35 AM, Bob Towers wrote:

> How come data mode r bar is LSB when USB is the default for all  
> bands and data modes? Shouldn't data mode r be USB, not LSB?

Classic RTTY AFSK uses LSB, not USB. You'd have to reverse the tones  
to use USB.

You can set up R and R-bar to be whichever sideband you want -- but I  
suggest LSB and USB, respectively.

I use R for RTTY and R-bar for PSK31.


Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

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[Leigh L. Klotz Jr WA5ZNU]

Doesn't the K1 swap the meaning of R and R- on the upper and lower
bands, or am I confabulating again?
Leigh/WA5ZNU
On Tue, 18 Apr 2006 7:37 pm, Bill Coleman wrote:
>
> On Mar 23, 2006, at 9:35 AM, Bob Towers wrote:
> You can set up R and R-bar to be whichever sideband you want -- but I  
> suggest LSB and USB, respectively.
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[Bill Coleman-2]

On Apr 19, 2006, at 12:53 PM, Leigh L Klotz, Jr. wrote:

> Doesn't the K1 swap the meaning of R and R- on the upper and lower  
> bands, or am I confabulating again?

Not exactly. R and R- are always consistent, but the K2 LO sense is  
inverted on 15-10m. This means that the opposite sideband is used to  
reverse the inversion.

So, the filter shape you see using R on 40m will be R- on 15m and  
vice versa, but the actual sideband you receive will always be LSB  
and USB, respectively.

Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

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