[hpsdr] Passed the smoke test

[James Thiessen]

Hi Phil,

"50c" you mean 50 cents as in any inexpensive  12v relay? I've been checking
prices of coax relays and their not cheap, thats for sure..

Thx for the info

Jim

On Tue, Mar 16, 2010 at 9:53 PM, Phil Harman <phil at pharman.org> wrote:

>      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'm using a 50c relay operated from the open drain FET on Penny.
>
> > 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?
> >
>
> The relay I'm using has sufficient isolation to enable full duplex
> operation at 100w.  I have also used separate Tx and Rx antennas - if you
> keep the Rx signal level below the point that the ADC overload does not
> light in KK then you will be fine.
>
>
>
> > 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?
>
> Yes, I use 100w without any problems.
>
>
>
> > 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.
> >
>
> The TR relay on Alex was chosen to work full break-in, I've tested it and
> it works fine.
>
>
> 73's Phil...VK6APH
>
>
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