Re: LF: OPERA Question

[M0FMT <m0fmt@yahoo.co.uk>]

Hi Stefan

 

From a complete beginner the tone is a single frequency Sine Wave centred upon 1.7 kc/s (kHz). So if you set your RX on 477kc/s then the RX window will be 478.6 to 478.8kc/s. Your TX needs to be within the band shown! It works just like a form of QRSS on off keying. I get away with just cranking the Cathode open to closed using an Electromechanical relay which may be some of my problems.....:-)

73 es GL Pete M0FMT IO91UX

From: Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Tuesday, 10 July 2012, 14:21
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

From: M0FMT mailto:m0fmt@yahoo.co.uk
To: mailto:rsgb_lf_group@blacksheep.org mailto:rsgb_lf_group@blacksheep.org
Sent: Tuesday, 10 July 2012, 11:11
Subject: Re: LF: OPERA MONITOR Now ?

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

From: Graham mailto:g8fzk@g8fzk.fsnet.co.uk
To: rsgb_lf_group@blacksheep.org
Sent: Monday, 9 July 2012, 18:51
Subject: Re: LF: OPERA MONITOR Now ?

Pete

 

RX set  500.000  usb ,   running   OP4  and   WSPR  rx  at the  moment 

 

GL !... G ..

From: M0FMT

Sent: Monday, July 09, 2012 6:26 PM

To: rsgb_lf_group@blacksheep.org

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