[hpsdr] ALEX - Input protection

[Henry Vredegoor]

Hi Shel, All,
 
I don't know what exact size I have to imagine when you say "battleship
dimensions" but I think they would be fairly big.
 
Wouldn't "normal", 10K to 100K resistors of say 1/2 or 1 Watt blow then too?
What about SMD type resistors?
 
Maybe a point to consider?
 
73's,
 
Henry.

-----Original Message-----
From: hpsdr-bounces at lists.hpsdr.org [mailto:hpsdr-bounces at lists.hpsdr.org]
On Behalf Of CT1IZU
Sent: woensdag 8 augustus 2007 11:59
To: hpsdr at hpsdr.org
Subject: Re: [hpsdr] ALEX - Input protection



> Would it be posable to design the ALEX so that at least one inductor is
> on the antenna side of any device that needs protection.  An inductor
> would filter out any fast raise time in the impulse and store it's
> energy
> which then can be dissipated more slowly.  In other words a low pass
> filter is already designed to shunt high frequency energy to ground



Might be a problem getting the right impeadance versus current handleing on
the low bands. It was not unknowen for front end coils to blow in AR88`s and
HRO's due to static even with their battleship dimensions.
Shel CT1IZU


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