[hpsdr] External disable of Penelope RF output?

[Helmut]

Pete, SWR protection is always a good idea to extend life time of your amp,
hi. As drive reduction doesn’t solve a mismatch problem of the antenna, it’s
better and safer to stop your amp by interrupting the amp’s bias. An
analogue ALC is not provided on any HPSDR exciter board, because PowerSDR
prevents any form of override of the board’s RF signal.

 

Pin1 (PTT-input) switches the Penelope to TX mode, when grounded. At pin 13
(PTT out) you’ll have access to the drain of a buffer FET to control  e.g.
an external relay for accessories like amps, XVTRs etc. Please see
schematics.

 

73, Helmut, DC6NY

Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von n3evl
Gesendet: Dienstag, 3. Januar 2017 00:18
An: HPSDR
Betreff: [hpsdr] External disable of Penelope RF output?

 

I'm contemplating some kind of high swr detection circuit in an external
homebrew amp.  I've seen some designs that detect hi swr and block RF from
the driving rig by using the ALC line.  Since Penelope does not have an ALC
line, is there some way an external device can tell Penelope to cease
generating RF?  

I see Penelope has pin 1 on the DB25 connector labeled as "PTT Input -
active when connected to ground" - but I'm not sure if this is relevant to
this issue or how this pin is used.

Thanks,

Pete, N3EVL





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