LF: RX Sensitivity on 500 kHz

[CHRISTOPHER OSBORN <c.cjo@btinternet.com>]

Dear LF,

I have just calibrated my 500 kHz DC RX using an AF-derived agc and s-meter.
The agc / s-meter are driven after a narrow audio filter.
I used a signal generator and a switched attenuator.

Attaching my receive loop aerial rotated for minimum local QRM I have a usual noise level of about 7 dB (uV) - S 4 - 5  (assuming S9 = 50 uV)
The main station end fed wire aerial gives a noise level of 16 dB (uV) - S6  !!
At times the local noise level is significantly worse.
My apologies to those who have called me and have not been heard.

The RX internal noise with aerials disconnected is well below 0 dB (uV).

Assuming there's no flaw in my calibration method I have registered the following
stations' readings, using the loop rotated for optimum signal:

G3KEV     32  dB (uV)
G3ROO    25    "
G3GRO    19   
 "
G3UNT     18    "

Any comments or suggestions are welcome.

Is there a list of 500 kHz operators ?
To date I have registered 19 of whom I have worked 14.

73 Chris G3XIZ

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