Thanks to all who responded and got me up to speed on this issue. Interesting
discussion. Boy, I'm glad I use FSK! Sure seems like that makes life a lot
easier. My radio is the Icom 7600 and I just rechecked the manual. Page 64,
"Data mode (AFSK) operation", discusses use of the three data modes in the 7600
- D1, D2 and D3. In the ACC set mode menu the various data modes can be
configured to select which input gets used for modulation input - MIC, ACC,
MIC/ACC, or USB. None of these offers an option to configure the Mark offset
for frequency display. At the bottom of page 64 is the following note.
"Carrier frequency is displayed when SSB data mode is selected." So, as many
have noted, use of LSB and one of the Data modes to run AFSK results in the VFO
displaying the carrier frequency, not the Mark frequency. I can find no way in
the 7600 setup menus to compensate for this.
I also use WriteLog with the MMTTY plug-in module as my contest logger. I can
find no way to modify the VFO displayed frequency for the actual Mark
frequency. There is a command in the Bands menu, "LSB is really FSK", but all
this means is, "If your rig must be in LSB mode to run FSK, set this check box
to tell WriteLog that when your rig is in LSB, it should record and report the
mode as FSK instead." No way here to offset to the Mark frequency.
I know it's considered bad form to spot yourself, especially in a contest, but
when I see someone spot me on the wrong frequency I would love to send out a
correcting spot saying, "Hey, I'm really over here!".
73,
Gary AL9A
----- Original Message -----
From: Robert Chudek - K0RC
To: MMTTY@yahoogroups.com ; RTTY Contesting
Sent: June 13, 2010 5:47 PM
Subject: Re: [MMTTY] Spot frequency
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
[Non-text portions of this message have been removed]
__._,_.___
Reply to sender | Reply to group | Reply via web post | Start a New Topic
Messages in this topic (4)
Recent Activity: a.. New Members 5
Visit Your Group
MARKETPLACE
Stay on top of your group activity without leaving the page you're on - Get
the Yahoo! Toolbar now.
------------------------------------------------------------------------------
Get great advice about dogs and cats. Visit the Dog & Cat Answers Center.
------------------------------------------------------------------------------
Hobbies & Activities Zone: Find others who share your passions! Explore new
interests.
Switch to: Text-Only, Daily Digest . Unsubscribe . Terms of Use.
__,_._,___
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|