Roll of in performance was quire fast below 300 Hz and much gentler above the upper figure. This was achieved over the entire RF range 0 to 30 MHz. With a simple 2 or three section band pass filter to get rid of RF LO harmonics, there is enough signal to drive an LF audio type amplifier directly. Two days of noise measurement made by G4JNT in the same period 73RX2.PCX Circuit diagram of portable 73kHz receiver. This has now been removed from this archive file, as it is on jntfile2.zip.
Reference is retained for any who downloaded the file earlier.
Hz as originally shown in the RadCom article. The various plotting functions may be changed whilst plotting, but the functions are slightly different for the 16 and 256 colour plots. These only affect the lines subsequently plotted the R key resets the display to top of screen. The data is stored immediately, and a filename is requested when capture has finished. Use for monitoring CW signals whose precise frequency is known The following keys can be used whilst the software is running.