[hpsdr] Using Mercury to monitor final amplifier transmit signal

[Tom Cathey]

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








-----Original Message----- 
From: Joe Martin K5SO
Sent: Thursday, February 07, 2013 10:16 AM
To: HPSDR List
Subject: Re: [hpsdr] Using Mercury to monitor final amplifier transmit 
signal

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


Tom,

As I realize that my description of how to connect directional couplers may 
not have been as clear as I intended, here is a diagram showing how to 
connect three couplers to achieve the required amount of attenuation for 
Mercury.  In the case that the directional couplers are microwave couplers 
each coupler will have much more attenuation than is shown in this diagram 
so only two need be used to obtain the required attenuation.

http://k5so.com/coupler_connections.pdf

73,  Joe K5SO

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