[hpsdr] Penelope J6 Open Collectors on TX

[n3evl]

I'm attempting to use the Penelope J6 Open Collectors to control band 
selection on the LPF board of an external homebrew amplifier.

I've configured the matrix in PowerSDR with the desired pin-to-band 
settings; the settings for RX and TX are identical.

On my external LPF hardware I have an indication via an LED of which 
bank of filters is selected.  For RX all looks well - the correct LED 
lights up as I change bands via PowerSDR so this suggests the J6 pin 
utilization is correct and my wiring from Penelope outward is OK.

When in TX mode (either via the Tune button or via the MOX button) none 
of the LEDs are lit so I end up with no filter selected.

I've measured the voltage at the various pins (the relays on the LPF 
board are driven by 12V) and for a given pin, when not enabled, I see 
12V and when enabled (in RX mode), I see approx 9V.  For the same pin in 
TX mode the voltage does not change and remains at 12V suggesting the 
pin is not being enabled by the software perhaps.

Note:
1) the LPF does not know or care if the mode is RX or TX  so there is 
nothing else at play on that hardware that might be different in TX mode.
2) Since this is an LPF that is only in use during TX, I don't really 
need to select a given filter on RX but obviously need this selection to 
be made on TX.

Has anyone got experience using the J6 pins on TX and can confirm they 
work and agree with the settings in PowerSDR?  On looking at the 
Penelope documentation I noted that there does not appear to be any 
restriction on using the pins for both TX and RX - it just says to check 
the boxes in both parts of the matrix.  Is there perhaps another setting 
I missed that enabled J6 for TX?

Various versions are shown below (yes, probably time I upgraded to 
something newer)

OpenHPSDR mRX PS v3.2.28 (10/3/15)
Metis 3.0
Mercury 3.4
Penny[lane] 1.8

Thanks for any advice,

Pete, N3EVL


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