Re: New MGM Modes on Beacons
I have not got hard numbers to hand, but I can compare it with
the 23cm beacon, where the beacon is approximately 95dB above
noise in 2.5kHz bandwidth and results in a rise in the apparent
band noise of 5db when I beam at it on 1296.200. My LO and the
beacon oscillator are almost identical, so probably each
contributes the same amount of phase noise. I have a crystal notch
filter in the 28MHz transverter IF to reduce the beacon signal
level by about 50dB going into the K3.
The 13cm beacon is about 10dB weaker, there is no change in band noise at 2320.200 when I beam at it. There are no major spurs in the SSB/CW part of the band, but they are apparent in the beacon band. When we have got it on air again I will make some proper measurements.
On 16/03/2021 13:19, alwyn.seeds1 wrote:
Dear John and Andy,