VHF/UHF Experiment -
 

Been out of the game for awhile, and starting to get back into the ham thing
again. Looking to do some playing on 6M, 2M and 70cm - using low power
around 5 watt max - maybe as high as 10w. My old yagis have been storm
damaged and the wx is not the best for antennea work, so here is what i
would like to try.

Using a TV vhf/uhf log periodic as the antennea, fed with RG6 - question is
how much pwer can those small TV type baluns handle? Anyone out there
tried this set up? Not expecting great results, just something to play with
.. Have tuners for 6 and 2M, can rig sopmething for 70cm.

Any and all comments welcome.

73
Gordon VE9GC

On Mon, 02 Feb 2004 14:23:29 GMT, "G.M. Cotton"
wrote:

Been out of the game for awhile, and starting to get back into the ham thing
again. Looking to do some playing on 6M, 2M and 70cm - using low power
around 5 watt max - maybe as high as 10w. My old yagis have been storm
damaged and the wx is not the best for antennea work, so here is what i
would like to try.

Using a TV vhf/uhf log periodic as the antennea, fed with RG6 - question is
how much pwer can those small TV type baluns handle? Anyone out there
tried this set up? Not expecting great results, just something to play with
. Have tuners for 6 and 2M, can rig sopmething for 70cm.

Any and all comments welcome.

73
Gordon VE9GC


Hi Gordon,

Consider, in this case the purpose of a BalUn is to maintain a match
against widely different Z's (typically consisting only of the
resistive part). The BalUn is typically very efficient, Typically
you encounter a low SWR. With those things considered, the only risk
is one of heat. You already answer that with efficiency (power goes
out the antenna, not up in heat). Further, if 10W is as hot as it
would get, imagine holding a christmas tree bulb (7.5W). How much
risk would that be (and we still wouldn't expect it from an efficient
component passing 10W through it)?

73's
Richard Clark, KB7QHC