El 09/03/2010 02:08 p.m., KH6TY escribió:
Using FSK instead of AFSK means you can run a big amp Class-C and get
more power output. Also, you do not have to worry about preserving
linearity on a Class-AB or Class-B amplifier if running FSK,or figure
out how to interface the computer to the
El 09/03/2010 03:55 p.m., rein...@ix.netcom.com escribió:
Hello All,
Suppose I would build an transmitter with a x-tal oscillator, lets say
running at 7040.000 Hz
Part of the system was a balanced modulator and just to make sure a
a high quality crystal filter, with a 1:1.05 shape factor,
as well as on K3UK's
sked page... Let us created two camps: the ROS haters and the ROS
lovers...the good guys and the bad guys, and all in the name of the
ham radio spirit of course!!
:-O
Marc, PD4U
--
MSc. Ing. José Angel Amador Fundora
Profesor Auxiliar
Departamento de
:
If MFSK16 was randomized would it magically become
spread-spectrum?
--
MSc. Ing. José Angel Amador Fundora
Profesor Auxiliar
Departamento de Telecomunicaciones
Facultad de Ing. Eléctrica, CUJAE
Calle 114 # 11901 e/119 y 127
Marianao 19390
Ciudad de la Habana, Cuba
Tel: (53 7
Warren,
Please allow me put my two cents. I would not expect so if the spreading
code is the same.
The adventage of CDMA is code orthogonality, each user has a different
chipping code that has little correlation with other user's codes., and
so, there is little mutual QRM.
As far as I
I am using a similar interface with two transformer and an optocoupler.
I DO RECOMMEND an optocoupler
for avoiding problems with high induced EMF's due to thunder EMP. It is
important down here.
The solution for those old rigs is to use an external digital VFO, say
a PLL or a DDS, I would
I used a Radio Shack scanner and tapped the demodulator (MC3359) output
to an scope.
Used another synthesized radio to calibrate, first on channel (0 Hz
difference...hopefully), then 5 kHz up and 5 kHz down.
It gives proper reference to baseline and peak to peak deviation.
Then modulate the
I was about to reply to the question of why the choice of frequency for
PSK31. I could not at the moment, but I see noone has addressed this point.
It happens that 3.579545 MHz (NTSC color burst) were aboundant and
rather cheap in the age of analog TV.
So, they have been used in some designs I
Rick W escribió:
Say, John, you also use Pactor 2 and 3 which are always 100 baud PSK
modes.
Pactor and Pactor 2 can work at 200 baud. Buit it requires little
multipath and good SNR.
Do you find that these modes work through the ionospheric
conditions when sound card modes, even those
Once upon a time, in a very distant galaxy, there was an ace pilot named
Anakin Skywalker...
Linux has not been very successful here in the U.S. with most ham
computer users.
But it just has not been very practical at this point because like
so many things in life, the trade-offs are
Per,
I use BOTH.
I just meant a joke, because the dark side of the force is always lurking
I did not mean to hurt anyone, and I do operate on the air as well,
perhaps not as much as I would like.
73,
Jose CO2JA
Per escribió:
These threads just do not end. Pse just use what you like and
Dave Bernstein escribió:
I understand, Jose. My question is whether the inner tones -- the
ones between the ensemble's highest and lowest tones -- contribute to
the bandwidth if their magnitudes are identical to those of the
lowest and highest tones.
I expect little contribution from
I use a PEP output meter and back off power a little to avoid clipping.
I think that works too for people that know their way around.
73,
Jose, CO2JA
---
Tony escribió:
All,
Had several QSO's with first-time MT63 OPs this week.
Some had a difficulty getting used to the software
Andrew O'Brien escribió:
For JT65A it will not work trying to tune in a signal transmitted USB and
received in LSB. I just tried it, the sync tones appear to be upside-down,
so like RTTY, it looks like you need a reverse button in the software,
there are none.
At least that is what I
I believe that nowadays 110 baud (or 100 baud) should fare better.
Sadly, PAX only passes unproto in Multipsk as modem (but maybe UI
packets are enough for TCPIP)
I would have to reinstall JNOS and try with Multipsk.
73,
Jose, CO2JA
Mark Milburn escribió:
No...I was thinking of his
I believe that the simplest is not reinventing the wheel, and using
MultiPSK as a modem, using traditional BBS programs as the mail
application.
Does anyone find this to be wrong?
The store and forward part could mean a *LOT* of work to be done, or
actually, re-done...
For traditional ham
Howard Brown escribió:
GM Jose,
There is one point in your post I would like to bring up. Where you
say:
Multitasking cannot handle tight ARQ timing windows.
It is a pity that noone has come forward (as far as I know) a real
time OS (RTL, for instance) with a proposal usable on an
It seems not so robust and more prone to errors. It requires the correct
decoding of 7 bits vs 5 bits on Baudot.
I read the same in old QST's.
Jose, CO2JA
John Becker escribió:
I recall that when the FCC first authorized the use of ASCII code for
RTTY in addition to Baudot in 1980, the
for this
reflector.
73 de
Ron W4LDE
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--
MSc. Ing. José Angel Amador Fundora
Profesor Auxiliar
Departamento de
Yahoo! Groups Links
--
MSc. Ing. José Angel Amador Fundora
Profesor Auxiliar
Departamento de Telecomunicaciones
Facultad de Ing. Eléctrica, CUJAE
Calle 114 # 11901 e/119 y 127
Marianao 19390
Ciudad de la Habana, Cuba
Tel: (53 7) 266-3445
Mail: amador at electrica.cujae.edu.cu
I believe that both have a space under the sun. The charm of the
simulator tests is _repeatability_,
even when the results on the air might be different.On the air, you
cannot have repeatability, so, the results,
even when real, are harder to correlate.
Yesterday I attmoted to get some real
be appreciated
by those without the resources for big power and antennas. It would be
quite an achievement.
Best regards,
Tony - K2MO
--
MSc. Ing. José Angel Amador Fundora
Profesor Auxiliar
Departamento de Telecomunicaciones
Facultad de Ing. Eléctrica, CUJAE
Calle 114 # 11901 e/119 y
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