[Elecraft] K2: Problems With PSK

[Jon Perelstein]

Don,

Do you ever sleep?  It seems as if every time I post something, no matter what 
day, no matter what hour, there's a response from you within a few minutes. hihi

Seriously, thanks for your reply.

You had me set the RTTY FL1 BFO about a week ago using Spectrogram.

At any rate, the problem I'm having happens when doing PSK with mode USB as well 
with mode RTTY (reverse).

Jon
KB1QBZ




________________________________
From: Don Wilhelm <w3fpr at embarqmail.com>
To: Jon Perelstein <jperelst at yahoo.com>
Cc: elecraft reflector <elecraft at mailman.qth.net>
Sent: Sun, October 10, 2010 8:42:59 PM
Subject: Re: [Elecraft] K2: Problems With PSK

Jon,

How do you have the RTTY FL1 BFOs set?  It sounds like you are attempting to use 
the default settings for the RTTY filter set, and that will not work well.

Enter CAL FIL (with the internal probe placed in TP2), and first set RTTY FL1 to 
the OP1 filter.
Then go to SSB and observe the BFO settings (tap BAND-) for both LSB and USB 
(write them down).
Then go back to RTTY mode and set the BFO for RTTY rev to the same value as the 
USB BFO, and set the RTTY non-rev BFO to the same value as the LSB BFO.

That should produce a good signal and a good waterfall display.
The FL1 BFOs are used for transmit in all cases, and RTTY will transmit through 
the filter on the KSB2.
FL2 thru FL4 can be set to anything you want because they will only be used 
during receive.  I normally set FL2 to 1.00, FL3 to 0.70 and FL4 to 0.40, then 
center those filters at 1000 Hz.  Attempting to center them higher will cause 
you to run out of BFO range in RTTY normal.  The narrow filters are good for 
RTTY operation (most others will likely use the full width OP1 filter) - set the 
Mark frequency in MMTTY (or other RTTY app) to 915 Hz and it will allow you to 
narrow the filters down so you can avoid QRM (tune with the VFO instead of 
clicking on the waterfall).

If you have questions about using Spectrogram to set your filters, take a look 
at part 3 of the K2 Dial Calibration article on my website www.w3fpr.com.