Further testing by John G8ACE with improved antenna and distance
Being a nice day for fooling around and with the 241GHz a trifle further forward I thought I should try the same test as I did a year ago on 134GHz.
A year ago I used two 20db horns and maybe around 100uW. At 241GHz there is considerably less power and so I tested with one of the 134GHz antenna systems on the Tx to get more erp, the gain estimated at about 44dbi from garden measurements taking open waveguide as 9dbi then the feedhorn took the signal up 15db and the addition of the dish another 20db = 44db give or take. The Rx would be impossible to use on foot portable with 0.5deg dish so its used with just the feedhorn ~25dbi, still quite sharp.
The note is a bit raspy but none the less its detectable at 0.44Km according to the map measurement, lets call it 0.4Km. Its further than one can shout (tho a megaphone with the same aperture size as the dish might change that) so its an important step forward and a reasonable first /P test as can be seen from the pictures.
Tx: HP HSCH 9101 beam lead x6 diode multiplier to achieve 241GHz
Tx Synth: ~2.6GHz x5 x3
Tx Antenna: ~44dBi gain
Rx: HP HSCH 9102 anti- parallel diode pair.
Rx Antenna: Feedhorn ~25dBi gain
