[hpsdr] Entry point

[AI2Q]

Thank you, Shel. I will study your ideas.

Vy 73, AI2Q, Alex

----- Original Message ----- 
From: "ct1izu" <ct1izu at sapo.pt>
To: "AI2Q" <ai2q at roadrunner.com>
Cc: <hpsdr at openhpsdr.org>
Sent: Wednesday, July 21, 2010 4:55 PM
Subject: Re: [hpsdr] Entry point


>
> ----- Original Message ----- 
> From: "AI2Q" <ai2q at roadrunner.com>
>
> --------------------------------------------------------------------------------
>
>
>> Having successfully built a G3XJP STAR (Software Transmitter and
>> Receiver),
>> which is now my main multi-band rig (along with a 600W homebrew MOSFET
>> amplifier), I'm interested in the HPSDR project. My question is, what is
>> the
>> best route to entry in either (a) the TAPR or (b) the pending UK design?
>> Where does a newbie start?
>
>
>
> Well you will definatley by a skilled hardware man to have done the Star
> Transceiver. The CURRENT  minimum with your skills
> will require the Atlas back plane, Magister and  Mercury  from TAPR and
> Penelope from Gerd DJ8AY g.loch at nt-electronics.de
>
> Pen has about a half watt tx out so you can replicate the Star tx  fron 
> the
> 2N3866 on the Magic Roundabout  onwards. For RX the Star low level
> BPF's are excellent but I would suggest you modify another LPF to high 
> pass
> configuration and put this ahead of the Merc RX input and if necessary
> use the final AMP LPF on TX/RX to form a wide HPF/LPF set.
>
> In practice here even with my 1100 foot Rhombic I find the HPF alone  in 
> the
> front end provides sufficent atenuation. Grey line is about the only time 
> I
> might see some
> overload on the Rx ADC and this is easily cured by moving up an octave on
> the filters.
>
> I guess its too much to hope you might be a software person. The Star DSP
> just begs to be mated with the HPSDR hardware for those hams who want
> a stand alone radio but I guess it will never happen.
>
> If you can wait Hermes may be the cheaper option, the intergration will
> certainly give give some cost savings.
>
> Mail me off list if you need further clarification on any points.
>
> Shel CT1IZU
>
>


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