Radioshack DiscOne Base Antenna vs 6 meter dipole

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by Ed Laugher » Thu, 25 Jul 2002 13:18:50

Hi

I would appreciate any info regarding the Radioshack Discone base antenna
for 6 meters.  How does it compare in performance to a simple 6 meter
dipole?   Same questions but for Discone antennas in general for 6 meter
ops.

73s
Ed AD5JV

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by discon » Thu, 25 Jul 2002 21:07:52


The RS discone is only going to cover about 1 MHz bandwidth on 6
meters because on 6, because it is using the base-loaded vertical
radiator part of the antenna.  Your signal will be omni-directional
and vertically polarized.

As far as 6 meters is concerned, you would be just as well off with a
vertical dipole, vertical coaxial, or even a base loaded 5/8 wave 2
meter antenna...... which would be a 1/4 on 6m.

A discone will cover a 10 : 1 frequency range.  The lower cutoff
frequency is determined by the length of the "skirt".  The length of
the skirt is 1/4 wavelength at the lowest frequency.  The diameter of
the disk is 70% of that length.   This RS model is probably designed
to cover 130 - 1300 MHz.  The reported coverage outside this range is
due to the base-loaded vertical section.

hope this helps..............

On Tue, 23 Jul 2002 23:18:50 -0500, "Ed Laughery"


>Hi

>I would appreciate any info regarding the Radioshack Discone base antenna
>for 6 meters.  How does it compare in performance to a simple 6 meter
>dipole?   Same questions but for Discone antennas in general for 6 meter
>ops.

>73s
>Ed AD5JV

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by hasan schier » Sat, 27 Jul 2002 23:10:00

The mechanical quality of the Radio Shack discone is quite poor. The
"spokes" fall off in windy Iowa after a relatively short time period. The
antenna worked ok, but mechanically it is "cheap".

--
hasan schiers, N0AN


or use amsat.org or arrl.net remailer

Quote:> Hi

> I would appreciate any info regarding the Radioshack Discone base antenna
> for 6 meters.  How does it compare in performance to a simple 6 meter
> dipole?   Same questions but for Discone antennas in general for 6 meter
> ops.

> 73s
> Ed AD5JV

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by Ed Laugher » Sun, 28 Jul 2002 11:48:02

Thanks for the info.

73s
Ed
AD5JV

> The mechanical quality of the Radio Shack discone is quite poor. The
> "spokes" fall off in windy Iowa after a relatively short time period. The
> antenna worked ok, but mechanically it is "cheap".

> --
> hasan schiers, N0AN


> or use amsat.org or arrl.net remailer


> > Hi

> > I would appreciate any info regarding the Radioshack Discone base
antenna
> > for 6 meters.  How does it compare in performance to a simple 6 meter
> > dipole?   Same questions but for Discone antennas in general for 6 meter
> > ops.

> > 73s
> > Ed AD5JV

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by Steve Robbin » Sun, 28 Jul 2002 21:23:05

On Fri, 26 Jul 2002 21:48:02 -0500, "Ed Laughery"


>Thanks for the info.

>73s
>Ed
>AD5JV


>> The mechanical quality of the Radio Shack discone is quite poor. The
>> "spokes" fall off in windy Iowa after a relatively short time period. The
>> antenna worked ok, but mechanically it is "cheap".

>> --

The discone has always been a beast mechanically due to it's number of
elements and the angles involved in the hub.

The Radio Snack antenna is a great electrical implementation but like
Hasan says, it vibrates apart in a steady breeze.  I fixed the problem
by using LockTite on the outer quarter of the threads on each element.
You would not want to LockTite the entire thread since this could
possible electrically isolate (insulate) the element from the hub.  I
tossed the little lock nuts that are on the elements and only rely on
the LockTite.  I have two at our camp up in Canada and they have
survived three Northern winters so far without problem.  

Steve

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by Darri » Sun, 28 Jul 2002 22:50:42

On Sat, 27 Jul 2002 08:23:05 -0400, Steve Robbins


>On Fri, 26 Jul 2002 21:48:02 -0500, "Ed Laughery"

>>Thanks for the info.

>>73s
>>Ed
>>AD5JV


>>> The mechanical quality of the Radio Shack discone is quite poor. The
>>> "spokes" fall off in windy Iowa after a relatively short time period. The
>>> antenna worked ok, but mechanically it is "cheap".

>>> --

>The discone has always been a beast mechanically due to it's number of
>elements and the angles involved in the hub.

>The Radio Snack antenna is a great electrical implementation but like
>Hasan says, it vibrates apart in a steady breeze.  I fixed the problem
>by using LockTite on the outer quarter of the threads on each element.
>You would not want to LockTite the entire thread since this could
>possible electrically isolate (insulate) the element from the hub.  I
>tossed the little lock nuts that are on the elements and only rely on
>the LockTite.  I have two at our camp up in Canada and they have
>survived three Northern winters so far without problem.  

>Steve

FWIW, mine has survived 3 years in the N/E, and is still holding
together.
 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by hasan schier » Sun, 28 Jul 2002 23:47:02

In Iowa, mine didn't last a year, and it wasn't just the elements "falling"
off from the screws getting loose...they broke off completely due to metal
fatigue. When I had it on the ground, simply brushing one of the discone
elements against my leg, snapped it right off. Mechanically, it is very
weak. (at least the one I had was).

--
hasan schiers, N0AN


or use amsat.org or arrl.net remailer

> On Sat, 27 Jul 2002 08:23:05 -0400, Steve Robbins

> >On Fri, 26 Jul 2002 21:48:02 -0500, "Ed Laughery"

> >>Thanks for the info.

> >>73s
> >>Ed
> >>AD5JV


> >>> The mechanical quality of the Radio Shack discone is quite poor. The
> >>> "spokes" fall off in windy Iowa after a relatively short time period.
The
> >>> antenna worked ok, but mechanically it is "cheap".

> >>> --

> >The discone has always been a beast mechanically due to it's number of
> >elements and the angles involved in the hub.

> >The Radio Snack antenna is a great electrical implementation but like
> >Hasan says, it vibrates apart in a steady breeze.  I fixed the problem
> >by using LockTite on the outer quarter of the threads on each element.
> >You would not want to LockTite the entire thread since this could
> >possible electrically isolate (insulate) the element from the hub.  I
> >tossed the little lock nuts that are on the elements and only rely on
> >the LockTite.  I have two at our camp up in Canada and they have
> >survived three Northern winters so far without problem.

> >Steve

> FWIW, mine has survived 3 years in the N/E, and is still holding
> together.

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by KB9TM » Sun, 28 Jul 2002 23:58:15


Quote:> In Iowa, mine didn't last a year, and it wasn't just the elements
"falling"
> off from the screws getting loose...they broke off completely due to metal
> fatigue. When I had it on the ground, simply brushing one of the discone
> elements against my leg, snapped it right off. Mechanically, it is very
> weak. (at least the one I had was).

> --
> hasan schiers, N0AN

If the RS discone was made with solid elements instead of the hollow
ones that are crimped onto the threaded part, it would be a much
better antenna. I just got through soldering up all my elements because
they were loose to the point of falling off. I sure hope this "fixes" it!

--
_________________________________________________________

'73' From KB9TMP
"The secret of life is honesty and fair dealing,
if you can fake that, you've got it made."
-Groucho Marx

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by Wayn » Fri, 16 Aug 2002 09:32:33

 I'm using that RS discone antenna.
 Change I made is using a 6 meter ham Stick on a bayonet mount.
 Worked well enough last night with an opening to Montana.
 And the two meter and up still has nice low SWR...
 Will work for 10 meters by changing whip.
 Mine is offset slightly, till I can find or make a better adapter.
 I love experimenting.

 Ham Stick is easier to tune, and I can just reach the antenna to change
whips.
 YMMV


> The RS discone is only going to cover about 1 MHz bandwidth on 6
> meters because on 6, because it is using the base-loaded vertical
> radiator part of the antenna.  Your signal will be omni-directional
> and vertically polarized.

> As far as 6 meters is concerned, you would be just as well off with a
> vertical dipole, vertical coaxial, or even a base loaded 5/8 wave 2
> meter antenna...... which would be a 1/4 on 6m.

> A discone will cover a 10 : 1 frequency range.  The lower cutoff
> frequency is determined by the length of the "skirt".  The length of
> the skirt is 1/4 wavelength at the lowest frequency.  The diameter of
> the disk is 70% of that length.   This RS model is probably designed
> to cover 130 - 1300 MHz.  The reported coverage outside this range is
> due to the base-loaded vertical section.

> hope this helps..............

> On Tue, 23 Jul 2002 23:18:50 -0500, "Ed Laughery"

> >Hi

> >I would appreciate any info regarding the Radioshack Discone base antenna
> >for 6 meters.  How does it compare in performance to a simple 6 meter
> >dipole?   Same questions but for Discone antennas in general for 6 meter
> >ops.

> >73s
> >Ed AD5JV

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by Wayn » Fri, 16 Aug 2002 09:38:15

 The RS discone is not a gain antenna, but is broad banded as all heck on 2
meters and up.
 Roughly equivalent to a 1/4 wave ground plane (with drooping radials) on
all but 6 meters.
 I find you can, by using an adapter (may need to make one) use a 3/8-24
whip for six, or even ten meters on this item.
 No problems with radials yet, but only a few months so far...

 Wayne WA2YNE


Quote:> I'm a bit surprised to hear all these complaints.
> I've had a Radio Shack discone up for the past TEN YEARS
> and not one element has gotten loose or broken off.

> I'm in Canada, so it's not like the weather has been
> particularly kind to it. Maybe the older discones were tougher.

> Anyway, that said, they're still not very good antennas RF-wise.
> I replaced it with a triband vertical a few months ago,
> and all repeaters got several S-units stronger...

 
 
 

Radioshack DiscOne Base Antenna vs 6 meter dipole

Post by Mike » Fri, 16 Aug 2002 22:51:24

I've been using a RS discone for several years and love it for receiving on
a wide assortment of bands.  I also transmit on 2 meters on the antenna.
I've also had the problem with ground plain radials because of the small
***threads working their way loose and falling off and they are easily
broken off during handling if you're not careful.  Maybe some bonding agent
would work holding the radials in.  Next time I take the antenna down I'm
going to try something like that.  My discone is about 5 years old I guess.

> The RS discone is not a gain antenna, but is broad banded as all heck on 2
> meters and up.
>  Roughly equivalent to a 1/4 wave ground plane (with drooping radials) on
> all but 6 meters.
>  I find you can, by using an adapter (may need to make one) use a 3/8-24
> whip for six, or even ten meters on this item.
>  No problems with radials yet, but only a few months so far...

>  Wayne WA2YNE