Rich, and others on the list,
Thanks for all of the suggestions. I got the system working.
The problem was the pitch setting. While in FSK D If you hold the Pitch
button the K3 shows the current pitch, (2125-170) is what was showing.
I changed it to low tones (915-170) and back to 2125. That fixed it! I
now have working FSK-D mode again. I'm not sure what was going on, but
the pitch was at some value of ~200hz, not 2125. Resetting the pitch
fixed it. So for future reference, don't believe the display, change it
and then set it back to what you want!! I was hearing a tone of about
200 hz when going into tx, but was hearing the 2125 when I pressed the
Pitch button. Now I hear a tone of 2125 and diddles when I use the
software to send something.
Thanks to all for the suggestions,
Gordon - N1MGO
On 11/9/2015 3:28 PM, Richard Ferch wrote:
Just a thought - is there any chance your K3 is not in FSK D, but in
some other Data sub-mode?
When I put my K3 into FSK D and press the XMIT button, I hear a
sidetone in my headphones that is identical to the tone I hear when I
press the PITCH button. (That's assuming I don't have the K3's MON
level set to zero.) The pitch of the sidetone is affected by the PITCH
setting, but nothing else I adjust, including filter settings and
XIT/RIT, seems to have any effect on it.
In PSK D, the sidetone is a PSK idle signal at 1000 Hz. In AFSK A and
DATA A, there is no sidetone unless there is audio getting into the
radio (e.g. from the Line In connector).
It has been years since I used FSK. I switched to AFSK soon after I
got my K3, as soon as I realized that the K3's transmitted signal was
cleaner in AFSK than in FSK. However, back when I did use FSK, when
there was a keying input connected to the ACC connector sending
diddles to the radio I heard diddles in the monitor, the same as I
would in AFSK where the input to the radio actually is a diddling
audio tone.
If you are hearing a 200 Hz tone (lower pitched than even the lowest
possible CW sidetone) with the radio transmitting in FSK D, there is
something very peculiar going on; that's not the way it is supposed to
work.
If you are hearing a steady tone in the monitor at the Pitch frequency
with no diddling, then either the software is not generating a keying
output (MMTTY set up for AFSK instead of FSK, for example), or the
connection to the ACC connector is broken.
You can use the K3 Utility to check some of this. Start the Utility
up, choose the Terminal tab, select RTTY, put the K3 into FSK D, type
something into the lower pane near the bottom of the window, press
Ctrl+T or click on the Transmit button, and you should hear something
that is mostly at 2295 Hz (the space tone), with diddles and text
characters causing it to diddle back to 2125 Hz (the Pitch setting).
If that works, then the problem is likely somewhere outside the area
that the Utility tests.
You can test for a problem in the K3's internal wiring to the ACC
connector by shorting pin 1 to pin 5 on the ACC connector to see if
that causes the sidetone to shift frequency. If that works properly
but you are not getting the same frequency shift when you try to use
your RTTY software, then the problem is upstream - in your cable or in
the configuration of the software you are using for FSK.
73,
Rich VE3KI
On 2015-11-09 12:05 PM, Gordon LaPoint wrote:
Rich,
Sorry, I am going by the monitor tone. I need to check the actual
rf on another radio and see if the Mark is really at 200hz offset or at
2.1Khz like it should be ( I use high tones from mmtty or 2tone)
the AFSK A is working normal. I did not hear any shift using FSK D.
I normally use FSK D, and the "pitch" setting was still correct, is
there another setting that affects the pitch?
Gordon - N1MGO
On 11/09/2015 11:29 AM, Richard Ferch wrote:
Gordon,
It's not clear what you mean. The mark output from the radio is at RF,
not at either 2 kHz or 200 Hz. Do you mean the audio monitor tone you
hear from the K3, or are you monitoring in some other way?
In FSK D (and also in AFSK A), the K3's dial displays the actual Mark
frequency as transmitted. If you are monitoring via an external
receiver, the two RTTY frequencies should be at the K3's dial
frequency (mark) and at a frequency 170 Hz lower (space).
The audio monitor tone from the K3 should be at the K3's Pitch
setting. If it isn't, that would seem to point to something odd in the
monitor, which does not necessarily mean there is anything wrong with
the actual transmitted RF.
73,
Rich VE3KI
N1MGO wrote:
I normally use MMTTY, with DXLabs. That is not the problem, the
Mark output of the radio is at ~200hz, NOT 2Khz as normal, and can not
tell if the space is there or not, due to the super low frequency
offset
from the dial frequency. I'm setup for SO2V operation with Writelog,
that also has the problem. I did check for port conflicts and did not
find any.
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