[hpsdr] Alex board rx filter path

[Info]

Hello,

I am trying to figure out the rx path in Alex.

If RX IN on the rx schematic is hooked to RCVR on the tx schematic, it 
appears that the rx signal passes
through the tx lp filters or bypassed in 6M, then through the tx 55Mhz 
LPF, swr transformer, then to
the antenna ports.  The rx signal, therefore is DC shorted to ground 
through the swr transformer.

Is this correct?
How do I deactivate the tx lp filters on all bands in rx mode?

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On the rx board, if IN/OUT is activated, it disconnects the antenna 
ports, and will receive from one
of the 3 aux rx inputs: RX1, RX2, XV RX.  Presumably, with IN/OUT on, 
one could hook an external
preamp to RX OUT, and then to one of the aux rx inputs, giving the 
external preamp access to an antenna
port.

Is this correct?

TIA

73's

Glen K4KV