[Elecraft] potential of static damage

Fri Mar 14 13:44:00 2003

Hi

The KPA100 has a big choke connected from ground to the antenna connector
placing the antenna a DC ground. The basic K2 the DC path is from the
antenna through the LP filter toroids and T4 to ground so the antenna is
also at DC ground. In the K1 the RF detect circuit is across the antenna
placing 1.7K to ground discharging any static build up

Don Brown
KD5NDB

----- Original Message -----
From: "Wallace, Andy" <[email protected]>
To: <[email protected]>
Sent: Friday, March 14, 2003 11:20 AM
Subject: RE: [Elecraft] potential of static damage

> > -----Original Message-----
> > From: Wallace, Andy
> >
> > An interesting side-conversation: what sort of protection do the
> > K1/K2 have against ESD coming from the antenna? (Wind can induce
> > static charge there, too, as you say.)
> >
> > Andy
>
> Whoops - to clarify, I don't mean ESD at the antenna damaging
> devices in general, inside the rig; I mean damaging RF circuits
> DIRECTLY in the signal path -- front end FETs, etc.
>
> In the old days, they had neon lamps between the antenna jack
> and ground, etc.
>
> Andy
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