I had this problem in spades finding an antenna to use on my
Miata with a Yeasu FTM-10R, which does 2M and 70Ccm along with
AM and FM broadcast. The FTM-10R manual says, “NOTE: An
antenna designed with a matching device that forms a low DC
resistance to ground may have poor recep on on the AM
Page 2
broadcast band.”
I finally parked the car outside our local Ham Radio Outlet and
took antenna after antenna out to try them. I ended up with a
Larson NMO-2/70 SH antenna which would receive AM and work on
all the rest of the bands. In addition, it is quite small and
doesn’t overwhelm the car.
73 Bill AE6JV
On 3/25/16 at 2:27 PM, pin...@erols.com (Charlie T, K3ICH) wrote:
OR buy a 5/8 wave base-loaded 2m mobile whip -
loads on 50-MHz very nicely. That's an old trick
for dual-band 6m/2m use. Try brands like Larsen
or Maxrad.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com
This only works for a 5/8 wave 2 M antenna where
the base inductor (It's NOT a * loading coil)
isn't tapped and grounded at one end. In other words, if
there is a single connection to
the antenna, this will work.
If there's a ground connection such that the
inductor is tapped up the coil it will not
function on 50 MHz.
The Larson LM series will work, but ones designed
for the Motorola (NMO) base will not.
73, Charlie k3ICH
* A 5/8 wave antenna presents roughly 50 Ohms
resistive and some level of capacitive (-J)
reactance.
In order to match this impedance, a series
inductor is required to cancel the capacitive
reactance, So technically, it is not a "loading" which would
be designed to make up for the fact that an
antenna is too short for a ¼ wave resonance.
-----------------------------------------------------------------------
Bill Frantz | Privacy is dead, get over | Periwinkle
(408)356-8506 | it. | 16345
Englewood Ave
www.pwpconsult.com | - Scott McNealy | Los Gatos,
CA 95032
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