On Fri, Aug 13, 2004 at 11:49:42AM -0700, Bill Swingle wrote:
| But, in my experience. Most any antenna designed to be shorter than the
| factory monopole will Decrease signal. The R/C site agrees with this and
| claims a minimum range reduction. No surprise here.
Right-o.
Probably the best
Hi Bryan,
Tuning (I'll assume you mean adjusting length) is not required. All RX's
offered have similar lengths of lead material @ 1/4lambda. One OEM to another
may be slightly different depending on their particular RF front end.
This implies those frequencies near the middle of the range
On Fri, Aug 13, 2004 at 12:22:05PM -0600, Howard Mark wrote:
| This is technically not true. The antenna length should be a binary fraction of the
wavelength.
Yes and no ... not all binary fractions are ok. Nothing smaller than
1/4 wavelength is resonant without some sort of matching setup
In our scenario the losses would be greater than 6, as the dipole (other half
the GND side to servos etc) is always unbalanced.
Quoting Doug McLaren [EMAIL PROTECTED]:
I don't know how much worse than the stock antenna it'll be, but a
factor of 6 power loss would not surprise me. A loading
Because of a lack of shielding in most RC transmitters you don't really know
how long the antenna really is. The real length includes the base that
goes into the transmitter, sometimes all the way to the bottom, and also the
wire from the RF deck to the antenna. The only way to tune the antenna
Hi Anker,
As you are refering to the transmitter antenna, you can include your body and
the surrounding ground making up the GNDplane. As a result, the premise that
the worst point of radiation os off the end of (directly in line) the antenna
element is not true. These extra factors have the
as the dipole (other half the GND side to servos etc) is always
unbalanced.
Oh shoot, UNBALANCED. Excellent observation! I forgot about the GND issues.
This is bringing back painful college memories. Very icky math in antenna
theory!
Bill Swingle
RCSE-List facilities provided by Model
On Fri, 13 Aug 2004, Simon Van Leeuwen wrote:
Hi Anker,
As you are refering to the transmitter antenna, you can include your body and
the surrounding ground making up the GNDplane. As a result, the premise that
the worst point of radiation os off the end of (directly in line) the antenna
element
The AVA building instructions at Kennedy Composites specify the back end
of the towhook is 18 from the nose with the cone on. I don't understand
this phraseology. Does he mean the rear of the part screwing into the fuse
or actually the end of the towhook (I.E., the tip?) I'd appreciate
Hello Arne,
Close. Generally it is accepted that pointing the transmitter antenna at the
aircraft will create the worst signal reception as seen from the aircraft's
receiver.
Due to the human, and the near earth ground plane, the actual area of worst
reception (null point - or area of minimum
Here are my Bubble Dancer locations.
Should be very similar to the Ava's:
CG is 3.75 behind the center LE.
Rear face of the towhook is 3.50 behind the center LE.
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The instructions are vague, at least to me. IMHO, Barry should just state
where the center of the shaft (as if I were drilling a hole) should be.
They are talking about the back side of the part that screws in the fuse.
NOT the very back end of the horizontal part of the hook. Guess now I
Guys,
The system is made to work with less than optimal antenna position. If
we could all have RF transparent planes with the right structure for
mounting a precision cut antenna, then great, like the man said, we could
all fly our planes even further past that mile we can't see them at
anymore
I have an old Xterminator Pro fuselage with an XP3
aileron wing that had terrible glitch problems. I ran
the antenna inside the boom, wrapped around the boom
and straight down the boom and nothing worked. I
finally glued a piece of very thin music wire to the
back of the wing inside the aileron
Wow...never thought this thread would grow to be this long!
Antenna theory is too much...I'm going to go back to my elementary school
days and just fly paper planes and maybe some control line if I get really
ambitious :) come to think of it at the last club meeting I couldn't even
get a
Silver Springs NSS Meeting
A meeting of the NSS Board of Directors was held at Silver Springs Maryland
on November 23 and 24, 1974. All but two of the 12 members of the board
were present or represented by proxies, a very good turnout considering
everybody had to pay their own expenses.
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