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> Op users 2B ?
operator can choose the frequency where he transmits
Yes , but each end of the link needs
to have the same qrg , by convention , the
frequency coded in the software is used to
ensure maximum chance of intercept by other stations
Operation could be defined by carrier
frequency , using a set BFO offset , but
'dial set usb' is taken as the normal definition ,
this was formulated at the start of
wspr usage , where the concept of a receive
'audio band' was introduced , being simpler to
define the dial frequency..
casual intercept is possible , as onyl 50% of
the data is required for a decode (
unlike ROS-MF data mode , where the sync frame
'must' be decoded) but the search Rx must
remain stable for the remaining duration
G..
Sent: Tuesday, July 10, 2012 2:21 PM
Subject: LF: OPERA Question
Opera experts,
I have a simple question to Opera. If the
program keys a PTT of a PA like a CW key and the operator can choose the
frequency where he transmits, what is the range of frequencies where a decode
can be expected from someone who set his RX to e.g. 477 kHz? Is it a USB
bandwidth, so maybe from 300...3000 Hz, i.e. 477.3...480 kHz?? Can i completely
free decide where i want to transmit on?
And if someone decides to let Opera
choose the transmit frequency in that band (e.g. by using a HF TRX and a
transverter), where does the program usually transmit. Is is accidentially oder
is the range much more limited?
73, Stefan/DK7FC
Am 10.07.2012
14:29, schrieb M0FMT:
Hi Graham
I have found that if I run 24 Watts no body hears me. If I run one Watt
people hear me?? If I boost the 1 Watt rig to 4 Watts same rig people
don't hear me...... dohh! It may be RF into the Opera PIC keyer? I will next
time try screening the PIC keyer. But the thing is my PC decodes
everything.... why?? Any ideas?
73 es GL Pete M0FMT IO91UX
TNX FER RPRT
Am now sending op4 on 500 at 1/2 intervals on the hour and 1/2 hour
very approx. Can you report please if available will try to keep it on most
of afternoon.
73 es GL Pete M0FMT IO91UX
Pete
RX set 500.000 usb , running
OP4 and WSPR rx at the moment
GL !... G ..
Sent: Monday, July 09, 2012 6:26 PM
Subject: LF: OPERA MONITOR Now ?
Hi all
While you are all testing Graham's theory on optimum band usage could
you report my OP4 transmissions. I am using the stand alone PIC 'JNT
designed Opera keyer switching my all Valve (Tube for our Cousins)
TX.
Power now increased to four (4) Watts O/P from the original 1Watt at
the antenna up lead. Antenna up lead abt 40 ft x 128ft long E/W. from
IO91UX.
73 Pete M0fmt.
73 es GL Pete M0FMT IO91UX
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