Hi Graham, Terry and Group
Thanks for the report Terry. I also noted a dip in the sigs on
the DF6NM grabber and for a moment was concerned that the power
supply was in trouble again. Fortunately all was OK.
The TX is now transmitting OP32 on 137.777 kHz, 4.5 anps to the 100m wire.
Good luck to all and thank-you in advance to those who may be monitoring.
73
Joe VO1NA
On Sat, 1 Sep 2012, Graham wrote:
Thanks 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 ,
73-G.
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 ..
From: Terry GW0EZY
Sent: Saturday, September 01, 2012 4:05 PM
To: [email protected]
Subject: RE: LF: VO1NA
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
From: [email protected]
[mailto:[email protected]] On Behalf Of Graham
Sent: 01 September 2012 12:20
To: [email protected]
Subject: Re: LF: VO1NA
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
Tnx
Graham
From: Terry GW0EZY
Sent: Saturday, September 01, 2012 8:07 AM
To: [email protected]
Subject: LF: VO1NA
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
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