Gary,
There were a couple of excellent descriptions of what is "going on" with RTTY
spots not appearing on the real Mark frequency by some operators.
Specific to the MP-1000MP, the fourth paragraph on page 54 of the Yaesu manual
(that I downloaded off their website) shows the options for this radio. It says
the default setting will display the Mark signal frequency, which is what you
want when you post a spot. Unless you have changed this, you should be "set to
go".
In addition to checking this menu setting, you can determine whether your radio
is displaying the Mark frequency by tuning in WWV at 10-MHz. When your radio is
set correctly in RTTY mode, you will hear the Mark audio signal (2125 Hz)
generated by the WWV carrier. If the signal is zero beat, the radio is
displaying the suppressed carrier frequency.
I know N1MM Logger has the ability to "correct" the spot frequency if a
transceiver does not generate the proper Mark RF frequency. I believe WriteLog
does too, but someone using that software should verify my statement about this.
73 de Bob - KØRC in MN
----- Original Message -----
From: Gary AL9A
To: RTTY Contesting ; MMTTY
Sent: Sunday, June 13, 2010 7:18 PM
Subject: [MMTTY] Spot frequency
I've read stuff about this before, but would appreciate it if someone could
refresh my memory. During the DLDC contest I was spotted several times by
various stations. Most spots were at or very near my VFO frequency.
However, I noticed a few spots that were a couple of kHz below or above my
VFO frequency. For example, while running at 14082.75 (FSK) I was spotted
at 14080.6. Another time I was spotted 2.1 kHz above my VFO frequency.
I seem to remember this was due to the 2125 Hz shift. Is this a difference
between running FSK or AFSK? In the example above was that due to the
spotting station running AFSK on LSB? What about the spots above my
frequency? AFSK on USB? And what about the spots I send out while using
FSK. Are my spot frequencies correct or off too? It was a bit annoying to
call CQ endlessly and finally see someone spot me, but on the wrong
frequency! Can someone clarify this for me?
73,
Gary AL9A
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