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Change to the High Z Antenna Amplifier design
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Chris Moulding
The latest batch of the High Z Antenna Amplifier shipping today has an extra layer of protection against overload on the front end of the amplifier.
One of our customers has managed to damage one using 1500 W into a HF vertical antenna 10m away from the vertical receive antenna using a High Z Antenna Amplifier. The revised amplifier now has a gas discharge tube, static discharge resistor, 3 kV capacitors, TVS (transient voltage suppressor) diode and antistatic diodes on the amplifier input. It also has a TVS diode on the output. We tested the original prototype with a 150 W transmitter 3m away which we thought would be adequate! Regards, Chris |
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Simon
That should do the trick!!
Simon |
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David Cutter
Chris
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You’re not just going the extra mile.. It would be of interest to know the calculations you use 73 David G3UNA HNY On 30 Dec 2022, at 16:20, Simon <ohhellnotagain@...> wrote: |
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Chris Moulding
I'll look at doing that.
Another alternative would be to make a video showing the layers of overload protection in say the High Z Antenna Amplifier, Receiver Protection Unit and one of our old SDR-4++ receivers with a practical demonstration trying to destroy them with the 150 W marine HF transceiver I use for testing. Regards, Chris |
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John Tyler
A video as you suggest would be great Chris. Happy New Year. Regards, John On 31 Dec 2022, at 11:26, Chris Moulding <chrism@...> wrote:
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