Silver is typically used to help improve loss characteristics, but as others
have said, silver doesn't do much at HF. On VHF/UHF and above, it makes a
big difference.
The heat is just losses in the coil. 1.5 KW on 10m is a lot of energy.
Think of how hot your 1.5 KW hair dryer gets. There is some loss in the
coil and that is turned into heat.
You could probably make a new coil out of bigger tubing, but it would still
probably get hot. If you are really concerned about it, put a fan on the
outside of your case to blow air over the coil. But it's probably designed
with getting hot in mind. So no worries.
73,
Jon
NA9D
on 4/14/01 6:59 AM, Thomas haglund at thomas.haglund@comtech-data.se wrote:
>
> hello.i am a proud owner of Drake L4B amp.and as i was cleaning it out
> yesterday i was thinking about one thing.the pi tank on 10-15-20 m have
> silver on the coil,how is that affecting the tank ? and that coil is reeealy
> getting hot when i am puting 1.5kw out on 10m (home built PS) where does the
> heat come from and how can i prevent that kinda heat.is it possible to make
> the pi tank coil for those band with larger diameter on the coil ? and how
> does the thickness of the silver on the pi tank affect the tank and the temp
> and so on ?
-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)
Member: ARRL, AMSAT, DXCC, NRA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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