RF power from the IRF640 transverter PA is around 30-40W (depending on the PA voltage) and the ERP should be around 25-30uW using the earth-electrode antenna. At present, the transverter is only on 20% duty cycle TX and I have still to add the RX preamp and switching.
My recent 137.766kHz QRSS3 tests using a measured just 6.6uW ERP from the earth-electrode antenna have now concluded. Best reports were G3WCB (101km), G3XDV (61km) and G4FEV (56.7km).
|G3XBM just detectable on G3WCB's trace at 101km|
|Stronger signal with G3XDV at 61km|
|Similar signal at G4FEV at 56.7km|