[hpsdr] Passed the smoke test

[Chris Smith]

Jim

I'm just using a co-ax relay (RS from some years ago) one side connected to 13.8V and pulled down by pin 13 of the DB25 socket on Penelope "PTT Output – open drain FET conducts when PTT active". This pin is diode protected according to the spec I read somewhere.

Cheers

Chris
G4NUX


On 16 Mar 2010, at 16:31, James Thiessen wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> I have been following the list but this is my first posting. 
> 
> I have been collecting the bits and pieces for last 3 years and just completed my LPU and Atlas on the weekend, I updated all boards with the latest firmware (i had to modify batch files for latest sp1 quartus version),  installed Power-sdr and calibrated the Mercury receiver.  The Quick Start document coupled with N8UR's powerpoint.and video on the subject were very helpful.
> 
> Everything is working great so far.  I haven't tested Penelope in TX mode but I will try it out on the dummy load shortly.  It occurred to me I will need an antenna switch in order to use my new rig, which, I guess this is one of the main functions of the new alex module.
> 
> I am scanning the archives but I have some persistent questions.  How are HPSDR users doing TR switching while waiting for alex.       I read up on the DJ8AY TR switch but was wondering whether other home-brew techniques were being used while waiting for alex, or, are people just using separate antennas for  TX and TX.  
> 
> I notice people are using duplex using the KK (which I have not had chance to install yet).   How are you connecting the antenna and protect the receive input? 
> 
> I am getting ready to build pennywhistle here and  I assume I need to wait for alex before using the pennywhistle.   I am wondering however if the pennywhistle or higher power amp can used while in this duplex mode?   There does not seem to be much info on how Alex will work with break-in keying so I am also wondering whether this was tested and how it will work. 
> 
> Thanks in advance for any comments.
> 
> My thanks to all the hardware and software designers for putting together a terrific sdr system.  Hope to see you in Dayton this year.
> 
> Jim
> VA3KV
> Rockland, Ontario
> 
>   
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