I have long wondered just how small a dish we might be able to go to (one of my other interests is in Emergency Comms)
Since others have tried 50 and 60cm dishes, I thought that since I had a small 45cmx35cm dish available, I would see if I could receive the 11205 V Beacon (10706 I have numerous issues with)
A back to back comparison with my 1.1M dish was carried out. Pointing may not have been identical, so take these figures for what they are - A Quick test on a Sunday Afternoon.
That said, On my 1.1M dish I was receiving the beacon with 26dB S/N. The 45x35cm only received the beacon with a 10dB S/N margin, 16dB down on the 1.1M dish
I've also been having limited success with my FCDPP and RTL dongles (A Mixture of gain settings and potentially frequency selection etc, however on my 1.1M dish the FCDPP (serial way higher than Peter's) I was receiving the 11205 beacon with an 18dB margin. My RTL dongle was far worse at just 6dB margin. It should be noted that there was a 2 way F connector splitter in line, so add at least 3dB to those margins (Probably more).
I'm yet to get my Pluto to hear the beacon at all, although that is the next test. With the 16dB loss between the 45cm dish and 1.1M dish, 45cm may not be entirely out of the equation, for narrow band work, although of course we need to take into consideration that the 11205 beacon will be nothing like our transponders