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"My sub receiver is not sensitive either. Signals are very weak on strong 
signals on the main receiver. Difference is 9 S-points.

That's why I took the effort to measure the resistors. R43 is 51 Ohm, R37 and 
R45 are both 63 Ohm. These are on the other side of K10. Of course these 
measurements are influenced by the circuit.

These resistors are only in use when the attenuator is switched on. Otherwise 
they are bypassed by the relay.

I plan to make some cables so I can measure the board while connected to the 
receiver and being fed by a HF generator."