http://img172.imageshack.us/img172/4585/n8wwmad2yq4.jpg

Hello Friends,

Check this website www.calculatoredge.com you will find several RF
Calculator Tool, you donot need to learn the formula to solve the
equations, if you have inputs then you can just enter into and get the
equations solved.

You also get free magazine subscription on this website, I guess it is
useful

Tom

Hi, I have put up a dipole and I admit it is not a very good one, about
20 feet up, approx 60 ft. It works great as a receiving antenna and I'm
having fun listening, but so far no one can hear me. I have an Icom
IC-735, and using SSB, the watt meter on the radio shows full power as
I talk, but the watt meter on the tuner barely moves. In CW mode both
meters go all the way. Is this a typical symptom of a poor quality
antenna or does it indicate some other problem (besides my antenna
making skills)?

Any advice is appreciated.

Thanks,

Jim

Our ARES group plans on installing an Inverted V antenna on the
second story flat roof edge of a local building. The antenna mast is 13
feet tall above the roof edge. The Inverted V will run parallel the edge
of the roof and be approximately 35 - 40 feet per leg. Our primary
operations will be 80/75/40M with a desired ability on 60M. The
building custodian/owner will not tolerate open wire feedline with its
associated standoffs due to aesthetic considerations, so we must feed
this antenna with coax fastened to the mast. At the base of the mast,
on the roof, we will be using an SGC-237 antenna coupler.

The above setup is a given, with no room for compromise.

My questions for this group are as follows:

Would we be better feeding the above antenna feedpoint with twin coax
runs, using the center conductors as a 'balanced' feedline, or would we
be better of using a single coax to the feedline? In either case, the
coax runs will not exceed 20 feet and we must accept the losses in them.
Email response from SGC seems to indicate we would be better off with a
single feedline, but I am dubious about the SGC Tech Rep's response
since he/she does not seem concerned about feedline radiation.

I'm new to this and need your help in selecting which antennas to use
on my railroad motorcars.

The radio will be moved between two pieces of equipment. One cab has
a flat metal roof and the other has a fiberglass cab. I would like an
antenna that I can unscrew from the cab when traveling the equipment
down the road on a trailer. The radio will be using the NARCOA
licensed frequency of 151.625 MHz. I understand that this frequency is
in what is known as the VHF-High Land Mobile Radio (LMR) Service band,
and uses a modulation known as narrow band (5 kHz deviation) FM. I
will be using a Vertex FLT 2011 40 Watt radio.

Based on the little I know about this, I understand a special antenna
will be needed for the fiberglass cab since there is no ground plane.
Both antenna will be mounted directly to the roof through a hole. The
radio will be mount within 2 feet of where this hole will be drilled
so I only need a short wire to connect from the antenna to the back of
the radio.

If you can offer me suggestions as to which antennas to use, I would
be most appreciative. Please excuse me if I misused some of the
language of the hobby.

The cable used for the Cobwebb is:-

A very heavy duty twin cable with a 'figure 8' profile ideal for high
power speaker connection suitable for power amplifiers up to 500W
output.
42/0.15mm plain copper conductor
Rating 60V rms 6A
Overall size 5.7 x 2.9mm
Sheathed in white PVC with black polarity identification stripe

You can find it on the RAPID ELECTRONICS website at www.rapidonline.com
Part No. 01-0157.

Regards

Steve
================================================

After Google search no luck on any data on gain for this antenna.
Just installed with apex at 33 feet and has 27 degrees full length is
116.63 feet long and has a reduced length of 2.064%%. Is there any
gain over a point incident antenna? k4wys@cox.net

I'm a noob, and I'm considering installing a wire antenna using the
sole tree on my lot as one end. My question is "Is it dangerous if
the antenna touches the tree branches/leaves during transmit?" I'm
less worried about performance right now and more safety.

Marc
W5AMP

Hi

can someone explain how to connect 2 voltage 4:1 baluns in series to
achieve 16:1

Thanks

hi

I've had some interference from 1 to 30 caused by new elevator
equipment.

my building lookes like a long but narrow rectangle

it's about (rounding off) 100ft long maybe 50ft wide i'd guess

on each far end of the rectangle is an elevator room

both throw out same type noise

my antenna a horiz dipole center tuned (SGC) is ontop of the Eastern
one

some have recomended to help cancel the noise i try a noise
canceling device like a timewave anc4(others are simular so i'll use
anc4 as example)

i happened to have one hooked up anyway and already had a small
antenna extra up there i taped to the side of the elevator room it
picks up noise fantastic