Hello Ib.
Interesting allocation for D-Star.
-60dB at 145.800 may sound suitable, but in practice what matters is how many dB down it is at 145.800 minus one half of the bandwidth of your IF filter.
Ball park......... So -4kHz of doppler and -7.5kHz for a narrow FM filter gives your receivers bandpass down to 145.7885 MHz just 10k above the D-Star
Which means the two are probably going to overlap.
73
David
In a message dated 07/12/2008 20:34:56 GMT Standard Time, oz1my@privat.dk writes:
The theoretic spectrum should be more than 60 dB down on 145.800 MHz,but that does not seem to be the case. Including doppler the downlink from ISS is 145.796 MHz, when it is going away from us to the East, which is the direction of the repeater :-(
Personally I am just 6 km away from the repeater with no obstructions on the pass from it.