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
