[RTTY] Band Specific RTTY Problem

[John Merrill]

Have ruled out RF getting back into the SignalLink connections?


On Feb 8, 2012, at 4:08 PM, Chad Anders wrote:

> Group,
> 
> I been having an odd problem since first thing in the morning about two
> weeks
> ago now at the opening of the BARTG RTTY Sprint. When operating RTTY mode
> on 40
> meters I have a high ALC reading unless I adjust my TX down to virtually
> no output power. The output power and ALC are also wavering/fluttering
> instead of
> somewhat steady until the TX Pwr is adjust down very low. (i.e. 10-15 watts
> or
> less)
> 
> I run a Yaesu FT-950 and generate AFSK RTTY with a SignaLink USB. I run the
> rig
> in the PKT/LSB mode so that I have the use of the narrower filters. I've
> been
> trying to solve this for the last 10 days+ to no avail on my own. This is
> the
> only band the problem occurs on. On 80, 20, 15, and 10 meters everything
> adjusts as
> normal and seems as it always has and had before that morning on 40m. I
> have been through
> and through my settings on the rig and N1MM. The reaction is the same when
> operating with HRD/DM/780 as well though, so I feel that pretty much rules
> out a
> software issue. Everything seems ok on SSB and CW on 40m. I can generate a
> steady 100w CW signal on 40m that appears not to be suffering any
> abnormalities. The
> signal is getting out at least decent if not good on 40m RTTY as I could
> and can
> make contacts. I'm just worried about possible problems with the rig and
> even
> more so a harmful signal that's causing interference and troubles for
> others.
> This also seems to be an issue in PSK mode which had me eyeing the
> SignaLink,
> however it is most definitely a band specific problem I think and therefore
> it doesn't seem to me that
> is the likely issue.
> 
> Something is just not right and I'm at my wits end!!! I'm sure I didn't
> include
> some info you may need but I tried to include enough pertinent info to at
> least
> get us started. I hope this is not too out of bounds for this reflector.
> I'm just at a loss and I
> really want to get this solved in time for the CQ WPX RTTY
> contest this weekend. It's quite the handicap to not have 40m.
> 
> 
> 73,
> 
> Chad/KØCMA
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