Körner 19.3-40

Startbeitrag von MikeF am 08.04.2017 21:30

I decided I'd like to start the forthcoming Es season with a new toy. My near neighbour Paul has kindly adapted my Körner 19.3 beam to the newer 19.3-40 with enhanced F/B ratio.

The boom has been increased to 5.7M long and dipole spacing has been increased to reduce side lobes, but the main objective was to improve F/B ratio which has been achieved with minimal reduction in gain at the low end and no decrease further up.

The redesigned reflector array meant it was easier to just extend the boom at the rear end to attach the centre reflector. That plus the front extension allowed me to keep both the vertical elements and support chord in the original locations. This maintained the original balance point for the mounting bracket. The dipole was made from the same 1/2" tubing as the elements to save compromising the performance by using flat bar in the construction. Connection is via a half wave coaxial balun.

The new design, combined with the TGN ULNA 3018 Mk.IV Band 2 masthead preamp, could be a very interesting combination in the days and weeks ahead. One early indication of an improvement is that RNE 5 from Medio Cudeyo/Peña Cabarga in northern Spain, 872km from my location, is now available ~70% of the day/night via troposcatter.

I'd like to say a big thank you to Peter Körner for his ongoing support and development.


Here are plots showing the 19.3 and the 19.3-40 and some photographs of the installed antenna.

http://www.ukdx.org.uk/fm/Korner%2019.3-40/Korner_19.3-40_yagi.htm


Mike Fallon
Saltdean
East Sussex
UK
N50°48' W0°1'
IO90XT

Kenwood KT-6050 (80/110 kHz Murata filters) * Kenwood KT-6040 (80/110/150 kHz Murata filters) * Sony ST-SB920 (80/150 kHz Murata filters)
* Sony XDR-F1HD (PC controlled via Seeeduino board & XDR-GTK software v.3.1.7) * Elad FDM-S2 SDR * Airspy R2 SDR

P.Körner designed 19.3-40 Yagi (with improved F/B ratio/horizontal)/K6STI 5 ele vertical yagi on same boom at 11m agl/92m asl ( http://www.ukdx.org.uk/fm/19_3_yagi.htm ) on a Tennamast 7.6m telescopic/tiltover mast
( http://www.ukdx.org.uk/fm/Tennamast.htm ) * TGN ULNA 3018 Mk.IV Band 2 masthead preamp * CCW Multicoupler feeding the all tuners * RDS Spy v1.02r6 software via interface * RDS Spy v1.02r6 software via soundcard * RDSS v0400 software

For Low VHF/Band 1 monitoring: Airspy R2 SDR * Newsky DVB_T USB RTL2832U/R280T SDR / SDR# Software * Icom R7000 * Icom PCR1000 * Spectrum Lab software * HS D100
* LifeView FlyVideo2000 (SAA1734) TV Card * GP cut for ~30MHz * OIRT/STL's 5 ele Yagi

Propagation Maps and TX sites logged for the Month maps at
http://www.ukdx.org.uk/fm/FMLogs/Prop%2 ... 20Maps.htm
Propagation maps produced by FMLIST http://www.fmlist.org/ul_login.php?sprache=en
All-time FM log (from 2003) and current month's log at http://www.ukdx.org.uk/fm/FMLogs/FMLogs_index.htm
All-time Meteor Scatter Log map at http://www.ukdx.org.uk/fm/MSMap.htm

North Africa & Middle East FM Database: http://www.ukdx.org.uk/fm/fm_index.htm

YouTube Channel: https://www.youtube.com/channel/UCclhK0FGmlXSMTuogKGBIgg

Antworten:

Very nice Mike and right about the fact you wanted a better F/B because now you reduced the UK stations at the back of your antenna.
GD DX
Ruud

Zitat
MikeF
I decided I'd like to start the forthcoming Es season with a new toy. My near neighbour Paul has kindly adapted my Körner 19.3 beam to the newer 19.3-40 with enhanced F/B ratio.

The boom has been increased to 5.7M long and dipole spacing has been increased to reduce side lobes, but the main objective was to improve F/B ratio which has been achieved with minimal reduction in gain at the low end and no decrease further up.

The redesigned reflector array meant it was easier to just extend the boom at the rear end to attach the centre reflector. That plus the front extension allowed me to keep both the vertical elements and support chord in the original locations. This maintained the original balance point for the mounting bracket. The dipole was made from the same 1/2" tubing as the elements to save compromising the performance by using flat bar in the construction. Connection is via a half wave coaxial balun.

The new design, combined with the TGN ULNA 3018 Mk.IV Band 2 masthead preamp, could be a very interesting combination in the days and weeks ahead. One early indication of an improvement is that RNE 5 from Medio Cudeyo/Peña Cabarga in northern Spain, 872km from my location, is now available ~70% of the day/night via troposcatter.

I'd like to say a big thank you to Peter Körner for his ongoing support and development.


Here are plots showing the 19.3 and the 19.3-40 and some photographs of the installed antenna.

http://www.ukdx.org.uk/fm/Korner%2019.3-40/Korner_19.3-40_yagi.htm


Mike Fallon
Saltdean
East Sussex
UK
N50°48' W0°1'
IO90XT

Kenwood KT-6050 (80/110 kHz Murata filters) * Kenwood KT-6040 (80/110/150 kHz Murata filters) * Sony ST-SB920 (80/150 kHz Murata filters)
* Sony XDR-F1HD (PC controlled via Seeeduino board & XDR-GTK software v.3.1.7) * Elad FDM-S2 SDR * Airspy R2 SDR

P.Körner designed 19.3-40 Yagi (with improved F/B ratio/horizontal)/K6STI 5 ele vertical yagi on same boom at 11m agl/92m asl ( http://www.ukdx.org.uk/fm/19_3_yagi.htm ) on a Tennamast 7.6m telescopic/tiltover mast
( http://www.ukdx.org.uk/fm/Tennamast.htm ) * TGN ULNA 3018 Mk.IV Band 2 masthead preamp * CCW Multicoupler feeding the all tuners * RDS Spy v1.02r6 software via interface * RDS Spy v1.02r6 software via soundcard * RDSS v0400 software

For Low VHF/Band 1 monitoring: Airspy R2 SDR * Newsky DVB_T USB RTL2832U/R280T SDR / SDR# Software * Icom R7000 * Icom PCR1000 * Spectrum Lab software * HS D100
* LifeView FlyVideo2000 (SAA1734) TV Card * GP cut for ~30MHz * OIRT/STL's 5 ele Yagi

Propagation Maps and TX sites logged for the Month maps at
http://www.ukdx.org.uk/fm/FMLogs/Prop%2 ... 20Maps.htm
Propagation maps produced by FMLIST http://www.fmlist.org/ul_login.php?sprache=en
All-time FM log (from 2003) and current month's log at http://www.ukdx.org.uk/fm/FMLogs/FMLogs_index.htm
All-time Meteor Scatter Log map at http://www.ukdx.org.uk/fm/MSMap.htm

North Africa & Middle East FM Database: http://www.ukdx.org.uk/fm/fm_index.htm

YouTube Channel: https://www.youtube.com/channel/UCclhK0FGmlXSMTuogKGBIgg


von Ruud - am 09.04.2017 15:03
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