AHA....I knew I wasn't just another crazy As*& contester!!
BTW, FlDigi or Writelog (not free) with MMSTTY are both potent RTTY
contest logging RTTY tools.
:) Curt
KU8L
On 1/4/2012 10:53 PM, Garey Barrell wrote:
Bob -
The C-Line does fine for RTTY. The transmitter has a jack on the
back panel marked RTTY that when shorted shifts the carrier a bit to
ensure that both tones (2125 - 2975 Hz 850 Hz shift,)were passed
through the LSB filter unattenuated. It was originally designed when
we were still using 850 shift, but is no longer of any value for
today's (2125 - 2295 Hz 170 Hz shift) and should be left open.
I ran multiple 4 Series transmitters on RTTY for some years, at full
power and with transmissions of 30 minutes or more. You have to run
them just UNDER the ALC threshold (just below where the output levels
off) as you increase GAIN. PA tubes lasted a couple of years that
way, with 'end of life' at 100W output max on 14.075 MHz. Obviously a
small fan is a BIG help, either on top (blowing UP) or on the rear
panel of the PA cage (blowing OUT).
For contest type transmissions (excepting 10 minute CQs!) I wouldn't
hesitate to use full power, about 340 mA. If you make long CQs, I'd
back it down to about 300 mA. (~ 100W output) and the PA tubes will
last 'forever'.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Robert Fish wrote:
I have been thinking about using my C-line for the RTTY contest this
weekend.
How do I set the transmit audio (gain) level. Do I set it the same as
SSB where
the peaks are about 150ma? I am not set up here for FSK, so its going
to be a sound card affair.
Any general advice for C-line RTTY?
Thanks,
Bob K6GGO
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