Posted by
Ron D'Eau Claire-2 on
Oct 12, 2004; 7:35pm
URL: http://elecraft.85.s1.nabble.com/Re-BL1-Balun-tp370870p370872.html
The losses may be no different at lower power levels. It's quite possible
that if you're throwing away 10 dB at 100 watts, you're throwing away 10 dB
at 100 mw. It's just that the core doesn't heat enough to notice at lower
power levels.
The only way to be sure is to actually measure the losses under the
conditions the balun is 'seeing' in that antenna setup and at that
frequency. That's not easy to do. That's why it's so hard to evaluate the
efficiency of systems using baluns.
Ron AC7AC
-----Original Message-----
I have used the BL-1 at both QRP and 100 watt levels on a couple of
ladder-line fed doublets designed for multi-band operation... My BL-1 has
quickly heated, then saturated, using 100 watts into both 265' and 176'
doublets on 160, 80, and 40 meters. It is fascinating, although dismaying,
to see the SWR LEDs on the ATU rise from green (low SWR) to red (high SWR)
in a matter of seconds as saturation occurs. I'll continue to use the BL-1
at QRP levels but will "wind my own" more robust balun for QRO operation.
73
Todd
N9NE
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