What does 48" mean? Diameter? radius? circumference?
Where did the 51 pf value come from. Most small mag loops have variable
caps to tune them.
What is the "balun" you mention?
"4 turn coil around the copper pipe?" Not sure what you mean.
Small mag loops are pretty simple, and very well characterized. Most
are fed as resonant transformers.
More info would really help.
73,
Fred K6DGW
- Sparks NV DM09dn
- Northern California Contest Club
- CU in the Cal QSO Party 7-8 Oct 2017
- www.cqp.org
On 10/24/2016 5:22 PM, johnpierce wrote:
I could use some help with a MagLoop. I constructed a 48" loop from 3.8"
copper pipe. I have a 51 pf capacitor across the open end of the loop. I
am feeding the loop with a 4 turn coil around the copper pipe opposite of
the capacitor. Before checking the loop I tested a carbon resistor on the
balun (ant side). Using a 50ohm resistor on the ant side of a 1:1 Balun
which was fed with a 2' piece of 50 ohm coax and with the loop disconnected
I get the following readings from a MFJ 259B antenna analyzer:
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