: There are many types of conical antennas, the discone being an example of
: a very efficient broadband conical vertical. As you correcty point out,
: a discone has the disk at the top! Several manufacturers, such as TCI
: and Granger sell cone antennas that may match the brief description you
: provided. Their theory of operation differs from the discone, and they
: are probably somewhat less efficient.
: 73!
: Frank
: W3LPL
: donovanf@sgate.com
: On 27 Aug 1995 Gary_Jacek@Cyberstore.NET wrote:
: > Hi
: >
: > I recently drove past a building in town with what looks like a discone on
: > the roof. It appears to be mounted upside down. The 'disk' being at the
: > bottom and the open end of the cone at the top.
: >
: > I'm just curious whether this has any effect on performance.
: >
: > ..Gary
A discone antenna makes a good all around scanner antenna. The FAA has used discones at airports for
many years. One discone will cover 118 to 136 Mhz and 200 to 350 MHz and have a fairly low VSWR.
As you go up in frequency the relative size verses the wavelength becomes larger and you get higher
gain but the radiation angle also goes up. "Radiation Angle" is the angle above the horizon where
the antenna has the highest gain. For most scanning the signals are on the horizon so you want a
radiation angle at zero degrees, ie parallel with the horizon. A discone at low frequencies has an angle just above the horizon as you go up in frequency
discone upside down you will have the greatest gain below the horizon for better penetration
Can anyone provide me with the modification to disable the low battery indicator on the BC200xlt. If seen several references to it and believe this is my
Organization: Univ of Iowa, Image Analysis Facility
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References: <42chat$5ar@pipe5.nyc.pipeline.com>
NNTP-Posting-Host: caesar.iaf.uiowa.edu
In article <42chat$5ar@pipe5.nyc.pipeline.com>, stucohen@nyc.pipeline.com (Stuart Cohen) writes:
|> What's the overall track record on AOR scanners (reliability, performance,
|> service). Unless I'm wrong, if you want SSB, AM, and FM from broadcast
|> band-microwave, they're it? I need the ability to primarily monitor HF SSB
|> and VHF/UHF FM (+aircraft AM) during emergencies and exercises.
|> --
|> stu
|>
|>
I have had an AOR1000XLT no-gap scanner for about four years and have had little trouble. The manual leaves much to be desired and many of the key sequen
In article <foxcat-1609951231340001@philly20.voicenet.com>,
foxcat <foxcat@omni.voicenet.com> wrote:
>I'm brand new to scanning.
-Welcome!
>
>I have a Radio Shack PRO-26 scanner. 25MHz - 1.3 GHz
>
>I notice that several ranges of frequencies are locked-out. Below, the
>"-locked-" sign indicates the locked-out range of frequencies between the
>two frequencies shown, specifically:
8<snip>8
(frequencies deleted-unfortunatly my news server won't let me post less of a
reply than quoted text-refer to original post for list)
>Can anyone tell me if there are any modifications to fill in all these blanks?
>
>Any help would be greatly appreciated.
>
>Thanks!
It has been a while since I played with this radio, and I don't have
it in front of me, (Dad likes to keep his radios at home when I go to school
:-)) I think your problem may be due to the default selection of frequency
step. I too remember thinking there were gaps when I first checked it out and
then realized it was defaulting to something greater than 5kHz. (This is,
I believe, the smallest step possible, so your first on the list will not
change.) Note that the last two are cellular blocked and the only "mod" that
will fix that is to buy a new radio from some country of origin other than the
good ol' US of A. Note also that the limits in the ranges that you specified
around the FM broadcast band end on what would be a standard FM radio frequency. This convinces me that the frequency step thing is a good possibility.
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