Is there any plan to do a VHF net like last couple of years for benefit
of those of us who can't make it to MSW...?
Howard Bingham
KE5APJ
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On 5/27/2014 12:38 PM, WILLIS COOKE via BVARC wrote:
This is an interim report on the MSWE antennas.
I installed the TH-3 antenna contributed by Eddie of River Oaks Stereo
on a 15 foot pole on my well house. The antenna went together very
fast with the help of the color coding by Michael Monsour and his
helpers who disassembled and picked up the antenna. The only problem
that I found were that a couple of the hose clamps were on the wrong
piece of aluminum and the two bolts that hold the clamp to the mast
were 2" bolts that should have been 2-3/4" to allow for a mast in the
clamp. I will get a couple more stainless 5/16 bolts and put the
clamps on the right piece of aluminum when I disassemble the antenna.
The antenna was assembled using the weather marks on the aluminum and
the SWR on the assembly has good SWR on 20, 15 and 10 in the phone
band. It is about 2.5 at the bottom of the CW band on 20 and 15 which
is not surprising because the TH-3 is a bit narrow banded for both
modes. The triplexer and band filter add very little to the SWR when
installed. The 10 meter SWR drops to 1.75 at 28.000 and 1.25 at 28.4
and does not cross 2.0 until 29.200. With the triplexer and filter
the SWR is 1.5 at 28.0 and drops to 1.25 at 28.150 then rises to 2.0
at 28.380 and continues to rise to a peak of 3.0 at 28.690 then drops
to 2.0 at 29.000 and 1.5 at 29.3 and back up to 2.0 at 29.5. It
appears that this Filter is optimized for PSK and FM. Tests were made
with TS-480, AIM-4170C. Results generally confirmed by TS-480 SWR
meter and Daiwa CN-101. The TS-480SAT auto tuner will resolve all
high SWRS to give full output from the TS-480 and better than 80%
efficiency. No attempt to resolve tuning was made as there are no
external controls provided. No attempt to tell whether the triplexer
of filter is causing the curve and no trials were made with the items
separated.
A 40 foot pole was constructed with the bottom 18 feet being a steel
push pole (bottom two sections of a 44 ft pole) and 22 feet of
fiberglass surplus mast. This will be available with halyards to hoist
one or two wire antennas. An Alpha-Delta 80/40 meter antenna is
available, but has not been installed and tested. The pole has been
raised by a single person, but will be easier and quicker to raise
with multiple persons.
Willis 'Cookie' Cooke, BVARC MSWE Chairman, TDXS DX Chairman
K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart
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