Stefan and Graham;
I have a max power I can run if it is intermittent [as keyed cw] or keydown like WSPR. My transmitter will run keydown the same power on 73 kHz as keyed cw say 50% duty cycle. Plus I get 4 hits per hour with WSPR 15 and only barely one with OP65.
To me these factors seem to favor the WSPR without even considering on air test results. Be that as it may I am going to give WSPR a shot.
Stefan, I hope it will work OK if I use the 137 band reporterand have to put in a pseudo freq my call sign will be the 73 authorization?
I sent an e mail to Joe Taylor but could be a while to get any reply, am sure-Bob
Date: Fri, 27 Sep 2013 19:12:11 +0200
From:
[email protected]To:
[email protected]Subject: Re: LF: Re: QRSS OP WSPR
G,
Am 27.09.2013 18:07, schrieb Graham:
Which , if you
take into account , Opera is single tone on/off with app
50% duty cycle , self sync mode
and wspr is a 4 mfsk externally time locked
That doesn't matter at all! A successful detection is all that counts,
not the energy (or average power) needed. If Bob can TX 3 kW WSPR-15,
then the RF energy is 0.75 kWh. With 50% duty cycle it may be 0.375 kWh
but who cares????
For the test to be valid , the wspr carrier level
would of needed to be 50% less that of the Opera system
No.
Transmitting amateur radio stations have a certain transmit antenna
with certain limitations (say 0.1 % efficiency) and they have a PA
giving a certain RF power (say 100 W). This results in a certain ERP.
The goal of the amateur radio station could be to be received/decoded
in a distance as high as possible. It is usually completely
uninteresting if you need 0.1 kWh or 0.2 kWh for a transmission, except
in /p mode using batteries.
>From my point of view the only real advantage of Opera is that you can
use a simple keyed VFO, like in CW. But then some will complain about
the key clicks :-)
73, Stefan
