[hpsdr] A Question for Team Hermes

[Tim O'Rourke]

I used my Fl-1000 for years with no alc, same for mt THP amps.
Careful set up of drive eliminates need for alc.
Tim


-----Original Message-----
>From: Phil Harman <phil at pharman.org>
>Sent: Oct 21, 2011 9:17 PM
>To: "M.B.Singh Technical Traders of India" <mbsingh at gmail.com>, hpsdr at lists.openhpsdr.org
>Subject: Re: [hpsdr] A Question for Team Hermes
>
>***** High Performance Software Defined Radio Discussion List *****
>
>Hi Bhanu,
>
>Thanks for your question.  The current Hermes test code does not support ALC 
>from an external amplifier.
>
>There is provision to input external analogue signals (0-3v)  into Hermes 
>via the I/O header. However:
>
>1. Traditionally ALC is a negative going signal so this would need to be 
>inverted before connecting to Hermes
>
>2. In my opinion ALC is a very poor way of controlling the output power of 
>an amplifier since there is inherently a delay between the RF signal being 
>generated and the ALC voltage.  With correctly implemented processing of the 
>Tx signal in the PC, and using the gain-per-band controls, then ALC should 
>not be needed.
>
>Adding ALC capabilities to the Hermes code is not currently on the 
>development schedule.
>
>Good to hear that you enjoyed the Ethernet version of Hermes, you are 
>fortunate since I have yet to see one!
>
>73 Phil....VK6APH
>
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Tim O'Rourke 
W4YN at ARRL.Net
Low Power Amateur Radio Rocks 
Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
NHRA Life Member

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