What is the excact lower CW beacon frequency on the NB transponder?
I am calibrating the offset for my SDR so I need to know exactly what frequency the lower beacon is on.
I am looking for the zero beat cw frequency (that means the exact center of the carrier).
Here it is at 10489550.00 +/- 10 Hz (resolution of my transceiver dial).
Measured with Spectrum Lab to produce a tone corresponding with my CW pitch (500 Hz), 550.00 dial frequency produced 498.3 Hz this morning.
Yes, but we need to know what the TX frequency is from the gnd station so we can calibrate using the beacon. In the bandplan it is not clear what the exact transmit frequency is. They have a span and have not given the excact beacon frequency (at least I didnt find it).
The transponder adds 8089.500 MHz to all signals.
So the ground station transmits the beacon at 2400.050 MHz.
I calibrate my RX system to CW beacon 10.489.550.000 Hz (zero beat). For me it doesn't really matter if this is the perfect and "true" frequency or not. After that I calibrate my TX offset. Then I am ready to have fun 
But I have noticed that the engineering beacons of the different satellites are not always perfectly on the specified frequency. They vary in all directions. Who is right?
After I have calibrate CW beacon to 10.489.550.000 Hz the PSK beacon is exactly on 10.489.800.000 Hz. Thats all I need.
Both the satellite and the ground stations use state-of-the-art frequency standards so you do not need to worry if the frequency is right. It is very close.
Daniel EA4GPZ is doing doppler observations to the single Hz, see his articles about that.
pe1chl sure. But what frequency is the beacon transmitting on? There is no mentioning of this in the official band plan?: https://amsat-dl.org/en/p4-a-n…-and-operating-guidelines
It only states that between 10489,550 – 10489,555 there is CW beacon traffic. Not the excact frequency. Can someone confirm that ZERO BEAT of the beacon is 10.489.550.000 Hz?
Charlie Fox Mike (aka CFM)
