Dipole antennas and baluns
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Conrad Cardano
Nov 15, 2025, 8:42:46 AM (3 days ago) Nov 15
to Society of Amateur Radio Astronomers
Hi
I see with a half wave dipole, they use a 1:1 balun.
If I made a fullwave dipole, what balun should I use?
I am interested in 55.3 MHz for meteor detection.
Thank you for helping.
Alex P
Nov 15, 2025, 9:09:35 AM (3 days ago) Nov 15
to Society of Amateur Radio Astronomers
A "Full Wavelength Dipole" = two half wavelength segments means you will be feeding at the max Z point ~ 2500 ohms.
SO, a 49:1 Z ratio = 7:1 Turns ratio on the matching transformer ( 'balun' )
Alex
Conrad Cardano
Nov 15, 2025, 9:48:57 AM (3 days ago) Nov 15
to sara...@googlegroups.com
Thank you, Alex.
That’s helpful.
Conrad
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Mike Otte
Nov 15, 2025, 10:26:11 AM (3 days ago) Nov 15
to sara...@googlegroups.com
Conrad,
Don't go there!
Make a halfwave dipole. Don't use a unun , extra stuff You don't need.
Impedance will be about 70 ohms which will match TV coax . RG-6 or RG-59
Formula is for lengthen feet = 468/ freq in Mhz so 468/ 55.3 = 8.46 ft over all length when assembled, so make them longer to start
You are not transmitting so most any piece of plastic with holes in will hold together the junction of the coax and the wires. The ends can be held with just strings.
Solder junctions would be nice junctions but i have done a lot with wire nuts.
1-2 meters off of the ground.
a 9.73 ft reflector wire laying on the ground beneath the dipole will increase your gain.
73
Mike w9ys
On Sat, Nov 15, 2025 at 8:48 AM Conrad Cardano <cardan...@gmail.com> wrote:
Thank you, Alex.That’s helpful.
Conrad
On Saturday, November 15, 2025, 'Alex P' via Society of Amateur Radio Astronomers <sara...@googlegroups.com> wrote:
A "Full Wavelength Dipole" = two half wavelength segments means you will be feeding at the max Z point ~ 2500 ohms.SO, a 49:1 Z ratio = 7:1 Turns ratio on the matching transformer ( 'balun' )Alex
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Conrad Cardano
Nov 15, 2025, 11:12:05 AM (3 days ago) Nov 15
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Thank you, Mike
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Lester Veenstra
Nov 16, 2025, 7:49:55 AM (2 days ago) Nov 16
to sara...@googlegroups.com
Was not following the thread enough to catch the frequency, but a half wave dipole, or odd multiples, will gatch to 50 ohms at particular heights (details available) or more commonly when at the appropriate angle rather than a straight (180 deg)
Still is a bit” height above ground” dependent but in general a more reliable 50 ohms,
In HF up to 6m. At VHF the Discone antenna is a variation on the angular dipole theme
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
To view this discussion visit https://groups.google.com/d/msgid/sara-list/CA%2BG65tSzSNqFcEtY-D%2BGN3XjN204%3DYceM9_sSek%3DXg9PDuje4w%40mail.gmail.com.
Dave Typinski
7:48 AM (7 hours ago) 7:48 AM
to sara...@googlegroups.com
Hi Lester,
What's the function of the stub at right angles to the plane of the dipole elements? Is that connected to the signal path anywhere? And what's inside the gray box?
--
Dave
What's the function of the stub at right angles to the plane of the dipole elements? Is that connected to the signal path anywhere? And what's inside the gray box?
--
Dave
To view this discussion visit https://groups.google.com/d/msgid/sara-list/07a101dc564a%240c27dd20%2424779760%24%40com.
Lester Veenstra
10:47 AM (4 hours ago) 10:47 AM
to sara...@googlegroups.com
1:1 balun in box
With the whips supplied thiw will form a dipole with a minimum frequency of 14 MHz to 54 MHz and beyond.
If this is needed at 40m they supply two loading coils and a matching stub across the feed point (red Banana plugs)
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
To get past GMAIL SPAM FILTER reconstruct a return address from
lester "aptsign" veenstras "dot" com
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
To view this discussion visit https://groups.google.com/d/msgid/sara-list/6919ED73.5050205%40typnet.net.
Dave Typinski
2:13 PM (1 hour ago) 2:13 PM
to sara...@googlegroups.com
Got it, thanks Lester!
--
Dave
On 11/18/25 10:47, 'Lester Veenstra' via Society of Amateur Radio Astronomers wrote:
> 1:1 balun in box
>
> With the whips supplied thiw will form a dipole with a minimum frequency of 14
> MHz to 54 MHz and beyond.
>
> If this is needed at 40m they supply two loading coils and a matching stub
> across the feed point (red Banana plugs)
>
> Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
>
> To get past GMAIL SPAM FILTER reconstruct a return address from
>
> lester "aptsign" veenstras "dot" com
>
> 452 Stable Ln
>
> Keyser WV 26726 USA
>
> GPS: 39.336826 N 78.982287 W (Google)
>
> GPS: 39.33682 N 78.9823741 W (GPSDO)
>
> Telephones:
>
> Home: +1-304-289-6057
>
> US cell +1-304-790-9192
>
> Jamaica cell: +1-876-456-8898
>
> *From:*sara...@googlegroups.com [mailto:sara...@googlegroups.com] *On Behalf
> Of *Dave Typinski
> *Sent:* Sunday, November 16, 2025 10:28 AM
> *To:* sara...@googlegroups.com
> *Subject:* Re: [SARA] Dipole antennas and baluns
> [mailto:sara...@googlegroups.com] *On Behalf Of *Mike Otte
> *Sent:* Saturday, November 15, 2025 10:26 AM
> *To:* sara...@googlegroups.com <mailto:sara...@googlegroups.com>
> *Subject:* Re: [SARA] Dipole antennas and baluns
> <mailto:sara-list-...@googlegroups.com>
> <mailto:sara-list-...@googlegroups.com>
> <https://groups.google.com/d/msgid/sara-list/CAGewSRuKBiaAv353nPWkni9j28p15HnHJbygo0N1Qw%3Dp%3DyqYMg%40mail.gmail.com?utm_medium=email&utm_source=footer>.
> <mailto:sara-list-...@googlegroups.com>
> <https://groups.google.com/d/msgid/sara-list/CA%2BG65tSzSNqFcEtY-D%2BGN3XjN204%3DYceM9_sSek%3DXg9PDuje4w%40mail.gmail.com?utm_medium=email&utm_source=footer>.
> <mailto:sara-list-...@googlegroups.com>
> <https://groups.google.com/d/msgid/sara-list/07a101dc564a%240c27dd20%2424779760%24%40com?utm_medium=email&utm_source=footer>.
> <https://groups.google.com/d/msgid/sara-list/6919ED73.5050205%40typnet.net?utm_medium=email&utm_source=footer>.
> <https://groups.google.com/d/msgid/sara-list/00a701dc58a2%24ab857a30%2402906e90%24%40com?utm_medium=email&utm_source=footer>.
--
Dave
On 11/18/25 10:47, 'Lester Veenstra' via Society of Amateur Radio Astronomers wrote:
> 1:1 balun in box
>
> With the whips supplied thiw will form a dipole with a minimum frequency of 14
> MHz to 54 MHz and beyond.
>
> If this is needed at 40m they supply two loading coils and a matching stub
> across the feed point (red Banana plugs)
>
> Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
>
> To get past GMAIL SPAM FILTER reconstruct a return address from
>
> lester "aptsign" veenstras "dot" com
>
> 452 Stable Ln
>
> Keyser WV 26726 USA
>
> GPS: 39.336826 N 78.982287 W (Google)
>
> GPS: 39.33682 N 78.9823741 W (GPSDO)
>
> Telephones:
>
> Home: +1-304-289-6057
>
> US cell +1-304-790-9192
>
> Jamaica cell: +1-876-456-8898
>
> Of *Dave Typinski
> *Sent:* Sunday, November 16, 2025 10:28 AM
> *To:* sara...@googlegroups.com
> *Subject:* Re: [SARA] Dipole antennas and baluns
>
> Hi Lester,
>
> What's the function of the stub at right angles to the plane of the dipole
> elements? Is that connected to the signal path anywhere? And what's inside the
> gray box?
> --
> Dave
>
>
> On 11/15/25 11:08, 'Lester Veenstra' via Society of Amateur Radio Astronomers wrote:
>
> Was not following the thread enough to catch the frequency, but a half wave
> dipole, or odd multiples, will gatch to 50 ohms at particular heights
> (details available) or more commonly when at the appropriate angle rather
> than a straight (180 deg)
>
> Hi Lester,
>
> What's the function of the stub at right angles to the plane of the dipole
> elements? Is that connected to the signal path anywhere? And what's inside the
> gray box?
> --
> Dave
>
>
> On 11/15/25 11:08, 'Lester Veenstra' via Society of Amateur Radio Astronomers wrote:
>
> Was not following the thread enough to catch the frequency, but a half wave
> dipole, or odd multiples, will gatch to 50 ohms at particular heights
> (details available) or more commonly when at the appropriate angle rather
> than a straight (180 deg)
>
> Still is a bit” height above ground” dependent but in general a more
> reliable 50 ohms,
>
> In HF up to 6m. At VHF the Discone antenna is a variation on the angular
> dipole theme
>
> Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG
> CTM1)
>
> les...@veenstras.com <mailto:les...@veenstras.com>
> reliable 50 ohms,
>
> In HF up to 6m. At VHF the Discone antenna is a variation on the angular
> dipole theme
>
> Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG
> CTM1)
>
>
> 452 Stable Ln
>
> Keyser WV 26726 USA
>
> GPS: 39.336826 N 78.982287 W (Google)
>
> GPS: 39.33682 N 78.9823741 W (GPSDO)
>
> Telephones:
>
> Home: +1-304-289-6057
>
> US cell +1-304-790-9192
>
> Jamaica cell: +1-876-456-8898
>
> *From:*sara...@googlegroups.com <mailto:sara...@googlegroups.com>
> 452 Stable Ln
>
> Keyser WV 26726 USA
>
> GPS: 39.336826 N 78.982287 W (Google)
>
> GPS: 39.33682 N 78.9823741 W (GPSDO)
>
> Telephones:
>
> Home: +1-304-289-6057
>
> US cell +1-304-790-9192
>
> Jamaica cell: +1-876-456-8898
>
> [mailto:sara...@googlegroups.com] *On Behalf Of *Mike Otte
> *Sent:* Saturday, November 15, 2025 10:26 AM
> *To:* sara...@googlegroups.com <mailto:sara...@googlegroups.com>
> *Subject:* Re: [SARA] Dipole antennas and baluns
>
> Conrad,
>
> Don't go there!
>
> Make a halfwave dipole. Don't use a unun , extra stuff You don't need.
>
> Impedance will be about 70 ohms which will match TV coax . RG-6 or RG-59
>
> Formula is for lengthen feet = 468/ freq in Mhz so 468/ 55.3 = 8.46
> ft over all length when assembled, so make them longer to start
>
> You are not transmitting so most any piece of plastic with holes in will
> hold together the junction of the coax and the wires. The ends can be held
> with just strings.
>
> Solder junctions would be nice junctions but i have done a lot with wire nuts.
>
> 1-2 meters off of the ground.
>
> a 9.73 ft reflector wire laying on the ground beneath the dipole will
> increase your gain.
>
> 73
>
> Mike w9ys
>
> On Sat, Nov 15, 2025 at 8:48 AM Conrad Cardano <cardan...@gmail.com
> <mailto:cardan...@gmail.com>> wrote:
>
> Thank you, Alex.
>
> That’s helpful.
>
> Conrad
>
> On Saturday, November 15, 2025, 'Alex P' via Society of Amateur Radio
> Astronomers <sara...@googlegroups.com
> Conrad,
>
> Don't go there!
>
> Make a halfwave dipole. Don't use a unun , extra stuff You don't need.
>
> Impedance will be about 70 ohms which will match TV coax . RG-6 or RG-59
>
> Formula is for lengthen feet = 468/ freq in Mhz so 468/ 55.3 = 8.46
> ft over all length when assembled, so make them longer to start
>
> You are not transmitting so most any piece of plastic with holes in will
> hold together the junction of the coax and the wires. The ends can be held
> with just strings.
>
> Solder junctions would be nice junctions but i have done a lot with wire nuts.
>
> 1-2 meters off of the ground.
>
> a 9.73 ft reflector wire laying on the ground beneath the dipole will
> increase your gain.
>
> 73
>
> Mike w9ys
>
> On Sat, Nov 15, 2025 at 8:48 AM Conrad Cardano <cardan...@gmail.com
> <mailto:cardan...@gmail.com>> wrote:
>
> Thank you, Alex.
>
> That’s helpful.
>
> Conrad
>
> On Saturday, November 15, 2025, 'Alex P' via Society of Amateur Radio
> Astronomers <sara...@googlegroups.com
> <mailto:sara...@googlegroups.com>> wrote:
>
> A "Full Wavelength Dipole" = two half wavelength segments means you will
> be feeding at the max Z point ~ 2500 ohms.
>
> SO, a 49:1 Z ratio = 7:1 Turns ratio on the matching transformer ( 'balun' )
>
> Alex
>
> --
> --
> You received this message because you are subscribed to the Google
> Groups "Society of Amateur Radio Astronomers" group.
> To post to this group, send email to sara...@googlegroups.com
> <mailto:sara...@googlegroups.com>
>
> A "Full Wavelength Dipole" = two half wavelength segments means you will
> be feeding at the max Z point ~ 2500 ohms.
>
> SO, a 49:1 Z ratio = 7:1 Turns ratio on the matching transformer ( 'balun' )
>
> Alex
>
> --
> --
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> --
>
> Mike Otte W9YS
>
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>
> Mike Otte W9YS
>
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