Mine works fine at 220, VSWR on 440 is about 1.3:1 and rising fast. On
the QRP one I made, I left about 1" leads on the resistors, I had a
small brass tube to connect the center conductor down to the bottom
plate and I didn't want to cut it. VSWR on 6 meters is 1.6:1.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org
On 3/25/2015 8:13 PM, Charlie T, K3ICH wrote:
Yes, but the inductances are all in parallel. I built a decent dummy
load out of 24, 1200 Ohm, 10 watt wire wound resistors all in parallel
between two squares of fiberglass PC board. The SWR was only about
1.2:1 on 15 Meters and about 1.5:1 on 10 meters. Admittedly, not a
perfect load, but certainly adequate for the low bands just to soak up
some RF.
73, Charlie k3ICH
If you're going to use the paralleled metal film resistor construction
method, be sure to keep the resistor leads short and spaced them from
each other. Lead inductance will start to become a factor on 6 m and
up. I built mine with 40 2K 2W resistors and it works find at 100W if
used intermittently. It's air cooled. Don't know how much putting it
in oil would improve the dissipation.
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