Around 1958, I was part of the crew that built KPFK on Mt. Wilson in So
Calif. Our 10 dB antenna was a stacked ring design, and included a
two-stage heater than circulated 60 Hz AC to de-ice it. Icing didn't
affect the SWR or pattern but it did put mechanical strain on the
elements. Mt Wilson is also famous for a large telescope. I don't know
how they deiced that. 😁
Incidentally, the KPFK homebrew 10 KW PA comprised 4 4-1000A's in
parallel. I don't recommend 4-1000A's at 90.7 MHz, it was pretty squirrely
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 12/15/2020 12:21 PM, Mike Harris via Elecraft wrote:
It is mentioned in the ARRL Antenna Handbook that a closed loop array
like a Sterba curtain could be could be fed with a low voltage DC or
AC current to heat the wire to relieve it of accumulated snow and ice.
Regards,
Mike VP8NO
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