Körner 19.3-40

FM antenna discussion
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MikeF
Posts: 25
Joined: 16 May 2016 07:24

Körner 19.3-40

Post by MikeF » 08 Apr 2017 22:26

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 ... 0_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/UCclhK0FGmlX

Nick Gilly
Posts: 959
Joined: 18 Sep 2014 14:17
Location: Whitchurch, Hampshire, UK

Re: Körner 19.3-40

Post by Nick Gilly » 08 Apr 2017 22:52

I tried to have a look at the link but I get a "STOP! You are not authorized to access this page or browse the directory!" pop-up. Same thing with the North Africa FM database.
Good DX.

Nick, Whitchurch, Hampshire.

BW Broadcast RBRX Encore, Kenwood L-1000T, Yamaha T-2, Denon TU-800L, Kenwood KT-1100SD (modified), Yamaha T-85, Sony XDR-F1HD tuners, horizontal Körner 9.2 beam (Antennenland version), Yaesu G-450C rotator

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pe1etr
Posts: 1115
Joined: 07 Oct 2014 00:40
Location: Blackpool UK

Re: Körner 19.3-40

Post by pe1etr » 09 Apr 2017 00:44

Nick Gilly wrote:
08 Apr 2017 22:52
I tried to have a look at the link but I get a "STOP! You are not authorized to access this page or browse the directory!" pop-up. Same thing with the North Africa FM database.
The links work fine here

Peter
Duhok
Iraq (Kurdish Region)

MikeF
Posts: 25
Joined: 16 May 2016 07:24

Re: Körner 19.3-40

Post by MikeF » 09 Apr 2017 05:52

Nick Gilly wrote:
08 Apr 2017 22:52
I tried to have a look at the link but I get a "STOP! You are not authorized to access this page or browse the directory!" pop-up. Same thing with the North Africa FM database.
Should be OK now Nick
Mike Fallon
Saltdean
East Sussex
UK
N50°48' W0°1'
IO90XT

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

YouTube Channel: https://www.youtube.com/channel/UCclhK0 ... TuogKGBIgg

Nick Gilly
Posts: 959
Joined: 18 Sep 2014 14:17
Location: Whitchurch, Hampshire, UK

Re: Körner 19.3-40

Post by Nick Gilly » 09 Apr 2017 09:16

Thanks Mike. I'm also looking forward to the 2017 Es season. Let's hope it is better for everybody this year.

Can you null out any locals that you couldn't do before with the improved F/B ratio?
Good DX.

Nick, Whitchurch, Hampshire.

BW Broadcast RBRX Encore, Kenwood L-1000T, Yamaha T-2, Denon TU-800L, Kenwood KT-1100SD (modified), Yamaha T-85, Sony XDR-F1HD tuners, horizontal Körner 9.2 beam (Antennenland version), Yaesu G-450C rotator

Jim (Bournemouth)
Posts: 291
Joined: 18 Sep 2014 05:59
Location: Bournemouth, Dorset IO90BR
Contact:

Re: Körner 19.3-40

Post by Jim (Bournemouth) » 09 Apr 2017 21:13

Suspect if I put that up at mine, it would reach halfway across next door's garden. Mind you, beaming east, I could use the energy from Rowridge to light the house....
Mike, do you leave your Tennamast permanently raised?
I see from the photos you have it guyed. Plot here is too small to guy mine, (I have JUST enough room to luff it over) so I only raise it if I am active and wind speeds are not exceeding 20mph

I too am looking forward to the Es season. Our daughter is due to arrive into our world in early August, so hopefully June and July will be decent as her arrival will probably end my season :)
Jim, Bournemouth, Dorset. IO90BR.

Elad FDM-S2, Perseus/FM+ and Funcube Dongle SDR Recievers 8-element OP-DES for Band 2, 12-ele ZL Special for 2m, plus wideband vertical
.

Image

daveB
Posts: 1004
Joined: 07 Oct 2014 16:49

Re: Körner 19.3-40

Post by daveB » 09 Apr 2017 21:54

Our daughter is due to arrive into our world in early August, so hopefully June and July will be decent as her arrival will probably end my season
Congratulations! When my daughter arrived 30 years ago it ended my HF ham radio days - and I do not regret it at all :D [I was beginning to get bored with "my name is Ivan - you are 5 by 9 - I run xxx watts to a --- antenna - pls QSL" - and suffering increasing qrn].

But do not despair - you may have more opportunity for very late night / early morning DX - ing - if you wear headphones :lol: - or then again you may be fortunate and she sleeps through thte night.

Back on topic - for Mike: Do you have a much smaller "spotting" aerial so you don't miss dx off the back of the monster? Me - if I could squeeze a 9.2 Korner in I'd be happy.
SDRPlay, AirSpyMini, RTL dongles, SB920s, Yamaha TX930. 5 ele compact yagi on rotator at 18ft agl. FM5 facing east, FM5 facing south, FM3 facing NE, OIRT dipole, 3-ele Moxon vertical facing east.

MikeF
Posts: 25
Joined: 16 May 2016 07:24

Re: Körner 19.3-40

Post by MikeF » 10 Apr 2017 05:39

Hi Dave,
No I don't have a 'spotter aerial'. Of course some signal does get through off the back etc, but personally I'm finding the advantage of forward gain/FB ratio is a huge plus.
Regards

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

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

YouTube Channel: https://www.youtube.com/channel/UCclhK0 ... TuogKGBIgg

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