[GreenKeys] feeding audio to TU

[wa2hwj at att.net]

Ignore the center tap....parallel both LSB and USB outputs to the TU.  



-------------- Original message from "Eugene Hertz" <eugene at hertzmail.com>: -------------- 


> Hello all...Transmitter is behaving better, 51J4 receiver is still dead so now 
> I'm looking to use my harris rf-590H receiver to get my M28's on the air. Had a 
> question. 
> 
> The harris has separate LSB and USB line-level audio outputs (600 ohm adjustable 
> from -20dBm to +10dBm). Lets just talk about LSB for the moment. For LSB it has 
> 3 connections called: 
> 
> LSB LINE AUDIO 
> LSB LINE AUDIO-CT 
> LSB LINE AUDIO 
> 
> Looking at the circuit diagram, the audio stage of the receiver feeds the 
> primary of a transformer. The secondary has 3 connections as stated above with 
> the CT being "ungrounded center tap." All three are made availabe to the rear 
> of the receiver. 
> 
> My TU is the venerable HAL ST-6 whose audio input has the shield grounded 
> (IIRC). So what is the best way for me to take this 3-legged audio transformer 
> output and make it single-ended for use with the st6? 
> 
> any guidance apprecated! 
> 73 
> Eugene 
> 
> 
> 
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