[hpsdr] Using Mercury to monitor final amplifier transmit signal

[Warren C. Pratt]

Tom,

I'm away from a radio at the moment and can't immediately answer your
question about how to set up for duplex (perhaps someone else will help with
that).  However, it sounds like what you're seeing is the normal transmit
display, not a display coming back through Mercury.  For this transmit
display, samples are pulled near the end of the DSP chain in the computer,
an FFT is performed, and the results displayed.  No RF is involved in this
process.

Yes, you can monitor the signal from your amplifier.  Again, perhaps someone
by their radio can describe the duplex setup.

73,
Warren  NR0V


-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Tom Cathey
Sent: Thursday, February 07, 2013 9:03 PM
To: HPSDR List
Subject: Re: [hpsdr] Using Mercury to monitor final amplifier transmit
signal

***** High Performance Software Defined Radio Discussion List *****


Joe and Phil,

I tried to disable the signal displayed by Mercury when Penny is
transmitting.  It is always there, even when I remove the ant BNC plug off
the back of Merc's board.  It appears to be coming in from somewhere else,
like thru the board connector.

Is this the way it should be?  Or am I toggled on for the duplex mode
without realizing it?  How is the duplex mode enabled?

Bottom line is, with or without an antenna or even a connector on the ant
input to the Merc, when Penny is transmitting,  Penny's signal is strong and
stable on the Merc pan display. This is with no external amplifier
connected. I would like to see this low level signal disappear so that I can
then inject some external sampled RF from the amplifier into Merc's ant
input.

What am I missing?

Tom, k1JJ



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