[Elecraft] K3: Main RX gone deaf

[Udo Langenohl - DK5YA]

Gentleman,

I'm struggling with a Main RX vs. Sub RX issue. My Main RX is rather 
deaf compared to the Sub RX. I see at least 23.5dB attenuation between 
Main RX and Sub RX when comparing highly stable signals from my signal 
generator (HP8664A). This is only for ANT1/2 vs. AUX-IN!
Example:
-33dBm on 28.500
into AUX-IN (SUB RX): exactly 59 +40dB
into ANT 1 (Main RX): 59 +15dB
into ANT 2 (Main RX): 59 +15dB

I've checked all the usual suspects (pin diodes):
D1 and D5 on the KXV3A: o.k.
Each and every pin diode on the SUB IN board: o.k.
D5 on the Main RX board: o.k.

This is a K3 #59xx with almost everything inside money can buy.

My second K3 (serial #39xx) does not show this strange behavior. Main RX 
and SUB RX show exactly the same values on ANT1/2 and AUX IN. -33dBm is 
59+40 on MAIN and SUB RX, no matter if Ant1, 2 or AUX IN.

Any idea? I'm searching for weeks now and I'm close to give up.

Udo, DK5YA
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