Definitely worked ! this is from the psk data base
, using the command line search ,
On the sdr side, I think there is a lot
of mileage to be had , but as you can see , without the
necessary 'skills it cannot be done , eg,
the web-sdr implemented by the Dutch , now
that would give you individual windows from
the same data source , its possible at home
, but you cannot allocate separate audio feeds ,
noise is stacked up in the process ...
Tnx , G..
Graham
Fell
asleep over the keyboard at 23:00 so took a guess and left the system at 136.227
OP32.
SDR14/SpectraVue
was set up with dual channel receive ?dial? frequencies 136.000 and 136.227 kHz
with mono output so the OP32 decoder was seeing both OP32 sub-bands and could
dual decode VO1NA and the ?normal? stations DF2JP DF6NM etc. Bet it wasn?t
designed to do that as the decoder sees an extra 3dB of noise in this
arrangement but it seems to have sorted all the signals
out.
Now
off to the Telford rally.
73
and thanks for the test
Terry
This where it becomes a little
messy
The mid band audio
frequency's are OP32 = 1550
Hz and OP8 = 1650 Hz
So for a carrier frequency of
137.777 KHz , that gives Rx dial set usb
of 136.227 for OP32
and 136.127 for OP8
As the pass bands are 100 Hz
wide , then these will be +/- 50 Hz
max
So depending on the Rx setting
accuracy , you could round down to the
last , 20 Hz or 7 Hz
Eg my Skanti R5003 tunes in 100 Hz
steps , so 136.2 or 136.1 , would put
me 27 Hz off , which all being well ,
leaves 20 Hz or so to the filter edge
All Joe needs to post in
advance is the selected mode speed as a
change of speed , will need a Rx
re-set . I don't think Joe's TX P/C is web
linked , so there will not be a TX beacon
,
NB:: Now if you want , that
could also be translated to a dial
set for LSB as the Opera mode is
only 1 tone ........ but I don't think we
will go there just yet .. but would that
drop dfc39 out of the rx pass band .... I wonder ..
Sent: Saturday, September
01, 2012 4:05 PM
Yes
no problem. Please could you confirm the ?dial? frequency?
If
Opera could specify left or right audio channels I could do both sub-bands as
SDR-IQ/SpectraVue provides a two channel Rx with output on L and R channels.
Maybe SL could do the split for Opera.
I?ll
keep an eye on BS to see when to set up.
73
Terry
Joe was asking about
running Opera beacon on 137.777 as he is
fixed frequency , but problem is arranging a
monitor group as operations are now 136.000
usb
Is it possible you could
monitor 137.777 using Op mode , If Joe runs
overnight again ? Im sure we can arrange others
to join in
Sent: Saturday, September
01, 2012 8:07 AM
Joe
Screen
grab of your signals last night. Strongest appears around 04:30 UTC with
interesting deep QSB dip about 1 hr later. Still copy at 07:00
UTC.
SDR14
with Wellbrook LFL1010 untuned loop
73
Terry GW0EZY
