[Elecraft] Help with PSK

[Joe Subich, W4TV]

There is no problem with the shield of the USB cable.  

> If you want to generate AFSK-PSK31 with the Microham MKII, read 
> http://www.microham-usa.com/Downloads/MKII_RFI_Fix.pdf There 
> is a problem with the shield of the USB-cable.

This fix applies only audio from microphones connected to the 
microKEYER II (RF into the mic preamp in microKEYER II) and 
makes no difference with audio generated in the microKEYER II 
"soundcard."  

If you are going to do PSK31 (or any audio based digital mode)
you must use AFSK A or DATA A.  AFSK A is nominally LSB with 
center frequency equal to (MARK+SPACE)/2.  DATA A is nominally 
USB with center frequency equal to 1500 Hz. 

Typical operating conditions for PSK1 and AFSK in AFSK A or 
DATA A would have the Lin In level of the K3 at 10 and the TX 
output of microKEYER adjusted to give five bars on the K3 
ALC meter. 

73, 

   ... Joe, W4TV 
 


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Steef PA2A
> Sent: Tuesday, July 29, 2008 11:17 AM
> To: Tom Wylie; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Help with PSK
> 
> 
> Tom,
> 
> You should use the 31 bPS PSK-D setting as DATA MODE. If you 
> want to use 
> AFSK anyway, set it to DATA-A.
> 
> If you want to generate AFSK-PSK31 with the Microham MKII, read 
> http://www.microham-usa.com/Downloads/MKII_RFI_Fix.pdf There 
> is a problem 
> with the shield of the USB-cable.
> 
> 73 's Steef PA2A
> 
> ----- Original Message ----- 
> From: "Tom Wylie" <tom at gm4fdm.com>
> To: <elecraft at mailman.qth.net>
> Sent: Tuesday, July 29, 2008 1:35 PM
> Subject: [Elecraft] Help with PSK
> 
> 
> >I am trying (and failing miserably) to set up my K3 to work 
> PSK31 mode.
> >
> > I am using a Microham USB Microkeyer II and my normal Logger 32 
> > software
> > which I have used for aged with my MP running very fb.
> >
> > The outgoing tones from my K3 dont "sound right" and a near 
> neighbour 
> > says
> > my signal is very bad
> > unreadable and very broad.
> >
> > In the K3,   I have the compression set to 0  the mike gain 
> set to 0.  I 
> > am in Data mode   and using DATA MD have    PSK  D showing 
> -  31 bps.....
> >
> > My K3 ALC meter is still showing almost full ALC (according to the 
> > meter)
> > with almost now poer output (turned right down).
> > I have the TX knob on my Microkeyer set at zero and within Logger 
> > soundcard - psk window, have the output set right back, 
> well below the 
> > settings for the MP!
> >
> > I am receiving PSK no problem at all.     The radio is 
> connected to my 
> > computer via the serial port on the rear...
> >
> > I can run RTTY FSK without any problem whatsoever.
> >
> > I think i need a little guidance here...
> >
> > Tom
> > GM4FDM
> >
> >
> > --
> > So I met the bloke who invented crosswords today. I can't 
> remember his
> > name, it's P something T something R.
> >
> >
> >
> > ---
> > avast! Antivirus: Outbound message clean.
> > Virus Database (VPS): 080728-0, 28/07/2008
> > Tested on: 29/07/2008 12:35:55
> > avast! - copyright (c) 1988-2008 ALWIL Software. 
> http://www.avast.com
> >
> >
> >
> > _______________________________________________
> > Elecraft mailing list
> > Post to: Elecraft at mailman.qth.net
> > You must be a subscriber to post to the list.
> > Subscriber Info (Addr. Change, sub, unsub etc.):
> > http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/subscribers.htm
> > Elecraft web page: http://www.elecraft.com 
> 
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft    
> 
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com