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Ok Pete
Ive sent you a invite to the op group ,
The pic code has the call
sign encoded in the pattern , so you need to
use the windows software to generate the code ,
then copy and paste into a editor , but Andy jnt
or Eddie should be able to put things right
.. the mark/space and time windows are critical
The data is sent as a 'over layed
pattern' with no start or finish as would
be expected in a normal data transmission , the
only criteria is the PIC clock needs to be
'good' to ensure the m/s and tx time
is accurate , I think 0.2 %
Clock accuracy is important , along
with frequency stability , not down to
uHz levels , but OP32 requires +/-
1Hz over the 32 min tx time , Op4 may
be +/- 4 Hz , but the closer the
better will be the lower s/n levels , I
think some of the PA stations have old ww2
tx's which will not hold frequency , but
they may be vfo and capable of +/- 2
or 4 Hz over 4 mins
FB on the valves , well nothing wrong with
that ! would make a good picture for the
yahoo group !.
73 -G..
Sent: Thursday, May 31, 2012 7:58 PM
Subject: Re: LF: 475 kc Exiter
Ok Graham
I will try to talk to Eddie, my beacon is HB PIC built. I need to know the type of on off keying mark
/ space. I will take a look at it on the scope to see how the code is
applied and see if I can emulate it in code form.
Ok about power I will start at
the current power level using my Lap top and will let you know via this medium
on BS and Yahoo when its up and running plus as close as I can get the carrier
frequency. I can get onto the Opera channel using a DSS and xtal mixer but
power much lower. The xtal mixer is a
valve rig using 6.50-6.00=.5+/- VXO PA
6CL6 tube video bottle which I may try for a laugh (ancient and
modern.....:-).
73 es GL Pete M0FMT IO91 UX
Ok Pete,
Well if your set up on a different frequency
, if you have a date/ time for a transmission,
stations can re tune , all we need to
know is the carrier frequency, then can work out
the correct dial frequency for RX
...... would give you a idea
as to your coverage .... thats if you can on/off key the
carrier , or is the beacon pic contolled, which case , may be the
code change would be the most simple option
?
Should not need much over 10 watts
? you should find 1 watt enough with
that size of Ae
Not used the PIC code facility in the
software , but it will encode your
call-sign for Tx
, I think Eddie uses it for his qrpp beacon, should be able to
give you pointer if need be , Andy also
uses it for his LF/MF
beacon
73 -G..
Sent: Thursday, May 31, 2012 7:13 PM
Subject: Re: LF: 475 kc Exiter
Hi Graham
I will digest your mail and thanks for so much info. I have a beacon
that runs on 500kc/s it is not in the Opera band. It is currently at about
10Watts O/P to an inverted "L" up about 35ft x 128ft lng, running QRSS and
12WPM. Clearly seen on the Birmingham Grabber when on. Initially my plan is to
run Opera base upon your information. The operating times will be dependent
upon Internet usage here and reports. I will also QSY to the Opera frequency in due course. Now you have
confirmed it is not a linear mode I will commit my lap top for a period of time
to Opera operation and increase power to 40Watts +/-. If I can get a HEX code
for a PIC then it will be on Opera more often.
I will let you know the progress.
Once again thanks for the info to date.
73 es GL Pete M0FMT IO91UX
R Pete !
I think the answer is 42 !
Keying is designed round the
characteristics of a CW transmitter ,
There are TWO conventional and ONE Pic
methods of controlling a transmitter ,
A) By using the COM-Port
CW keying , by way of transistor switch ,
to key the Tx
as per normal CW
B) By audio drive from the
sound-card , to SSB
exciter , producing on/off single frequency carrier.
C) The windows software has
a PIC code generator , that may be used to
control a PIC based 'Beacon system'
There is no PIC provision for the
decoding of the signals
Transmission is by way of ON-OFF keying
of a single carrier frequency ..clever On/Off keying Magic
!
Decode is possible with up-to 50% data loss ,
the loss can be randomly along the TX time
line , the S/N reading is calibrated against
the Sim-Path software and shows 6 dB less
than wspr or fldigi , i.e -20
s/n Opera decode , would be -26 dB using wspr , however , the S/N is the
average along the time line and not the peak
value
At the moment , there is no 'dedicated'
data server , however the PSK-Reporting system is able to down
load data as a log-file. ( still looking for some
one to have a go at making one )
There is no need for internet linking or time locking
to operate the system , the internet provider's the distribution
of the decode data and TX beacon's are also
distributed via the internet
to alert of activity.
Tx and Rx
stations with web linking are displayed on the psk-map as are decodes of
-NON- web linked TX stations
The operating frequency's are defined
as 'Dial set USB'
, change of mode , also changes the TX frequency ,
so if using VFO/DDS etc , the correct
off set must be added to ensure
the signal falls in the RX pass band ,
When using the windows based software , the
TX carrier frequency is placed in the lowest s/n
area of the pass band , by a
scanning routine , active during reception , this
is to prevent collisions of TX's and to avoid heterodynes and other
carrier based band users.
QSO mode is able to send 15
chrs using the same encoded
data system and is a live keyboard data mode.
Data recovery (local) is only by cut and
paste at the moment.
Op is the first 'Plug and Play' data /
beacon mode , just unplug the mores key and
play away hihi
73 -G..
Sent: Thursday, May 31, 2012 7:05 AM
Subject: Re: LF: 475 kc Exiter
Hi Graham
Is there any proper documentation for this Opera stuff? Like
description of the method of Keying and how the logging system works. How do you
get qso data off the application other than screen dumps
which seems a bit crude. There are software buttons but they don't all work as
advertised.
Can you tell me where the full documentation is kept?
Can you tell me the Keying principle? I have not put the PC SC output
on the scope but there must be an easier way to get at the info. Is it FSK or Phase shift or some clever On/Off keying or
Magic?
Is there a web data base or is the screen info just a one
shot?
Do I need an Internet connection during Beacon or QSO ing? With
my issues concerning Good Old BT and
their 19th century technology, rusty copper and
wet string, in the far flung out posts of North Hertfordshire that can't be done, so does that preclude
full use of this system.
Or is it all a secret and one has to dig into the application? Info
in README is sparse.
Has there been any projects to put this application of PIC processor
for say TX Beacon mode? Or RX for that matter?
There are more questions but any help would be of interest. Now that
I have managed to probably defeat BTs best
efforts to keep me off 500kc/s I would like to explore this mode a bit more.
Thanks.
73 es GL Pete M0FMT IO91UX
TX500 is not supporting WSPR or Opera Opera is
a single frequency on/off CW key replacement mode , if
it can send CW or QRSS , then it can
send Opera via the com-port keying facility, as many of
the MF/LF stations are so doing. WSPR on
the other hand is FSK based and requires , either
audio>Rf translation or DDS excitation , each has
its own uses , the design requirement / concept of
Opera was a 'Data mode' ' To be sent via a
normal CW
Tx' G.. -------------------------------------------------- From:
"Clemens Paul" < [email protected]> Sent:
Wednesday, May 30, 2012 11:15 PM To: < [email protected]> Subject:
Re: LF: 475 kc Exiter > Uwe, > > here an Email from Juma
from 2/2012 1regarding further developments: > >>Hello
Clemens, >>Thanks for your interest in JUMA TX500. >>TX500 is
not supporting WSPR or Opera. We will consider new transmit modes >>in
the future. > > 73 > Clemens > DL4RAJ > >
----- Original Message ----- > From: "Warren Ziegler" < [email protected]> > To: < [email protected]> >
Sent: Wednesday, May 30, 2012 7:45 PM > Subject: Re: LF: 475 kc
Exiter > > > Uwe, > > The Juma 500 is a FB
little transmitter, lots of built-in features > (synthesizer, keyer, swr
bridge, receive preselector, receive > converter) in a very small package.
It is capable of more than 60W > out, I have run it with 15vdc (which is
in-spec) and with a 30 ohm or > so antenna impedance you can get 100W out
all day and all night with > no complaints. > > 73 Warren
K2ORS > > > On Sun, May 27, 2012 at 3:39 AM, Uwe Wensauer
< [email protected]>
wrote: >> What do You think about the JUMA TX500
TransmitterI >> >> In my eyes a small Rig with 60 Watt and
built in Converter. >> >> By the way, have a look at the
filters in use – easy to built an >> duplicate >> >>
Uwe, dk1kq > > > > -- > 73 Warren K2ORS >
WD2XGJ > WD2XSH/23 > WE2XEB/2 >
WE2XGR/1 > > > > ----- > E-Mail ist
virenfrei. > Von AVG überprüft - www.avg.de > Version: 2012.0.2178 /
Virendatenbank: 2425/5033 - Ausgabedatum: >
30.05.2012 > > >
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