Jack,
Doug Talley of Pixel told me that the amp would work with a dedicated 12V power inserter when I contacted him re the improvements of the 1B loop over my 1A. After sending him pictures of my late 1A and it's amp, he determined it to be the then later variant. I guess my question is simple - will my Pro-1A work with a dedicated 12V negative ground power inserter for 'emergency' - or portable - use? I have appropriately sized diecast cases, connectors, etc, and some 1-10 mH rf chokes rated at several hundred mA, too. I should have taken him up at the time on his free offer - at least I'd no. Perhaps, as the designer of the preamp, Jack, you might comment on the suitability of this. If the bias will be way off - and the gain suffers - perhaps we'll look for a 'Plan B'!
John
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--- In loopantennas@..., Jack Smith <Jack.Smith@...> wrote:
Re battery backup of the Pro-1 loops ...
The power coupler supplies 20V DC (nominal) to the coax, and is normally
powered with a 24V AC (RMS) transformer. It is possible to replace the
transformer with a floating DC source such as a battery, but it will
need around 26V DC. A pair of 12V gel-cell batteries in series should
work.
One could try a 12V-120V inverter for battery power, but from
theoretical considerations it would need to be a sine wave or at least a
modified sine wave inverter. And, there is always the electrical noise
issue with inverters.
Jack K8ZOA
www.cliftonlaboratories.com
