Don -
Welcome to the club!! :-)
I don't know if FSK is 'better' or not. FSK IS stable and there are no 'phantom' signals (carrier,
unwanted sideband, distorted AFSK tones) that are all quite possible with AFSK. Best thing about
AFSK is that there are no mods required to the transmitter.
I
Hi Don:
Well..OKyes...but that isn't the fault of the software OR the
mode...just a dumbass operator that can't figure it out!! Ya gotta be
smarter than the hammer if you know what I mean.
Same guys that crank the snot out of the system using PSK and end up
being a KHz wide.
You never
How could anyone possibly tell the difference between FSK and the SSB/AFSK
equal?
Well, let's start with being off frequency all the time because the default on
MMTTY and other programs is that #$*& crap they call "ATC" I think. Whenever
anyone answers me so far off I have to use RIT, that'
Now, you know that is not true...you are just more DISCRIMINATING than
the norm(FM anyone?)
How could anyone possibly tell the difference between FSK and the
SSB/AFSK equal? Oh...Oh...I can tell!!
FSK is the one that isn't QUITE on the proper offset!! :)
Curt
KU8L
On 1/5/2012 1:17 PM
I'm afraid to advise on RTTY anymore since I learned I am the village idiot on
RTTY. Only ran in since 1968, so I'm still learning, but FSK is better, even
if I'm wrong again!!
73,
Don, WB5HAK___
Drakelist mailing list
Drakelist@zerobeat.net
Hi Bob:
I think I started the Silenx fan stuff...they are amazingly quiet and
the difference in heat is outstanding.
On the RTTY tune up, I just tune it up as per a CW or full SSB setup,
then set the soundcard to Tx RYRYRY...run the TX gain up until it stops
increasing the Ip, then back off
Alright I'm back, real life intervened for 12 or 15 hours since I asked
the RTTY question.
Thanks for the help guys. The first thing I thought of when I decided to
do this was Garey's stories about running 4 line gear on RTTY 24/7 and
it lasted for years. So I figured I had some margin for err
Bob -
OK. That's where I have seen it before. It's too bad those are such lousy scans. it's not that
hard to get a 'good' scan. I'll see what I can do with it.
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
Robert Ladden wrote:
There is a copy
at http://www.wb4hfn.com/DRAKE/DrakeArticles/RTTYops/Manual_RTTY.htm
I covers all the Drakes.
I would think Ron would allow you to make a copy for your CD (if permission is
really needed).
73,
Bob WW3QB
Bob -
The 'normal' audio passband fo
Bob -
The 'normal' audio passband for the transmitter is 325 - 2725 Hz. The RTTY jack shifts this to ~
825 - 3225 Hz to pass the 2975 Hz tone of 850 shift. It ALSO moves the carrier further down the
skirt of the LSB filter, which would improve the carrier suppression by ~ 10 dB. I will say
The Drake bulletin for RTTY recommended using the carrier shift even when using
narrow shift RTTY:
"Even when using narrow shift, this shift circuit provides additional carrier
and opposite sideband rejection."
I've been using it. Should I not bother?
73,
Bob WW3QB
___
AHAI 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
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 usi
Hi Donwelll...ya shot my lights out. :)
I think you are correct if I were doing long-winded RTTY ragchews like
we have done in the past. But the duty cycle is VERY short for RTTY
contesting and (I'm guessing here, less than 50%. I also run a very
good fan. The T4's ran very cool indeed
I got a DXCC-RTTY using my T-4XC with AFSK. I agree with this. I have a fan
blowing upwards above the finals. You can run 75 watts because the contest
messages are short.
73,
Bob WW3QB
Bob,
On RTTY, peaks are the same as average. It is continuous duty. I wo
Hi Bob:
I have done a few RTTY contests with the T4XA and B and run them much
harder than that. FSK is fixed level, tonal without the type of peaks
that make metering audio difficult.
I run it as hard as the tune and CW levels for plate current.
Garey and Don have a lot of experience with R
Bob,
On RTTY, peaks are the same as average. It is continuous duty. I wouldn't
run the T4XC much over 50W, with tubes as expensive as they are today if it
were me. You have to make your own choice, but there is a BIG difference in
the duty cycles of SSB and sound card RTTY. For sure I would
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?
Tha
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