Topband: Using shielded CAT5 data cable as feedline for active antenna; benefits of multi-turn K9AY loop/SAL/etc?
pa3csg at hoeplakee.nl
Sat Jan 2 11:52:52 EST 2016
I tried to measure this UTP cable as a receive line. For the results see:
The plan is only slowly moving forward:
To use one twisted pair as a receive line
One pair as the supply voltage
One pair to communicate via a RS485 protocol to control a several RX
antennas / K9AY and to control the gain of the preamp as well.
One pair left.
Since the discussion is going this way, how about the above idea?
I have not tried it but would be interested in your comments.
Regards & HNY!
Op 02-01-16 om 16:45 schreef Pete Smith N4ZR:
> I was recently reading a web page by LZ1AQ
> <http://www.lz1aq.signacor.com/>. It is full of fascinating data and
> design equations for the use of small magnetic loop antennas. There
> were two points, in particular, that caught my layman's attention:
> 1. He recommends using shielded CAT5 data cable with RJ-45 connectors
> as feedline. The obvious advantage is having three pairs left over
> for voltage supply and control. See
> <http://active-antenna.eu/amplifier-kit/> for more information.
> 2. He cites experimental data showing that coplanar crossed loops and
> multi-turn quad loops both offer very significant improvement in the
> recovered signalcompared with a single loop. See
> to check whether I got this right. Anyway, it occurred to me to ask if
> anyone has ever tried multiturn K9AY, SAL or flag/pennant receiving
> antennas, and did you see something similar?
> Any other critiques of his design would be appreciated. The price is
> certainly right, and the construction looks good. A couple of 1-meter
> coplanar loops wouldn't be at all hard to construct.
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