Although the cost is high I recommend the use of Cool-Amp
_ ()
for use on small loops and RF ground busses. We used this
product at the shop on all the copper buss connections for the
platers to lower the resistance. It leaves a thin silver coating on
copper and brass. I have used it on PC boards as well as RF
buss. A little bit goes a long way. Anything that can be done to
reduce the skin resistance has a good pay off in the end.
Eric
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In a message dated 6/19/2007 10:52:37 A.M. Eastern Daylight Time,
dldorrance@... writes:
Hi David,
Loop efficiency relates to resistive losses in the loop. If there
were no losses the efficiency would be 100%. Small loops have very
low resistance due to radiation, on the order of tenths of an ohm.
Compare this to 50 ohms for a dipole up a half wavelength. At such
low loop resistance, losses in the conductor out of which the loop is
constructed become significant. That is why small loops are made out
of pipe rather than wire in order to increased surface area and why
copper is preferred over aluminum, as copper has better conductivity
(lower resistance).
Dave WA6YSO
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