Hi Folks,
The Hi-Z Antennas brand amps already have a path to drain static as they
are designed to produce 4 to 5 Volts DC on the element with an internal
voltage divider. Attaching another resistor would degrade the performance.
Not only does this protect from static but it is a great fi
Behalf Of Lee.
KX4TT via Topband
Sent: Friday, October 18, 2019 8:16 AM
To: 'Mark Robinson' ; topband@contesting.com
Subject: Re: Topband: Hardening the 8 Circle Receiving Array
GM Mark,
The easiest way to think of this is Diodes = Detectors; with high-powered RF
around, that become
I’ve had good luck using fast zener diodes in series with ordinary
small silicon diodes (eg 1n914). The zener keeps the signal diode out
of the antenna circuit until the zener breakdown voltage, say 10V or
so, is reached.
73,
Jim w8zr
Sent from my iPhone
> On Oct 18, 2019, at 7:16 AM, Lee. KX4TT
GM Mark,
The easiest way to think of this is Diodes = Detectors; with high-powered RF
around, that becomes a Bad Idea. A possible alternative MAY be high-value
resistors to ground across the front end of the preamps. A representative
value would be 10 MΩ or greater, and I would match the resistance
8 Circle Receiving Array
I have the DX Engineering 8 circle receiving array sized for 80/160m .
It has been a fantastic performer but I have suffered damage to the
active antenna amplifiers on two separate occasions due to nearby
lightning strikes.
I am looking at a way to protect these
I have the DX Engineering 8 circle receiving array sized for 80/160m .
It has been a fantastic performer but I have suffered damage to the
active antenna amplifiers on two separate occasions due to nearby
lightning strikes.
I am looking at a way to protect these amplifiers. I was wondering i
