My Publications

Last Update Dec. 25th 2024

DG7YBN's Articles

About DG7YBN in Media

Known Bugs in Publications

PTFE (Teflon™) VHF Antenna Insulators by George Chaney, W5JTL (SK), revisited
Dubus 4/2024 with Joe Burke, WA8OGS and Richard Kreuter, WC8RK

Effective 50 MHz Triangle Stack by JI1HCD & JR1LZK
Dubus 2/2023 Yutaka Tasaki, JR1LZK, with Slobodan Bukvic, YU7XL and Hartmut Klüver, DG7YBN

Evaluation of the Effectiveness of JI1HCD & JR1LZK`s 50 MHz Triangle Stack compared to a four Yagi Stack
Dubus 2/2023

144 MHz seamlessly phased 4 x 28 ohms Low Noise Yagi Stack
Low Q, Low Noise Yagi YBN 2-7mz with completly simplified phasing of 4-bays with 75 Ohm lines to transform 4 x 28 Ohm to 50 Ohm at the connecting point according OK1NOR.
Dubus 1/2023 with Jindra Kostal, OK1NOR

Mit selbstgebauter Yagi-Antenne auf 432 MHz zum Mond und zurück
70 cm moon bounce with self made GTV 70-23m built on wooden lace with wire hanger pieces for elements plus a lot of basic information regarding successful EME operation

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Funkamateur 1/2023 ... Daniel Eberli, HB9EHD with Dan, HB9CRQ and DG7YBN

A new concept of building a performing 23 cm Yagi
A GTV 70-34w scaled to a GTV 23-34w including detailed building instructions.
South African Radio ZS, July 2021 ... with ZS6JON

A 1296 MHz Low Noise Yagi with a Bent Dipole
A GTV 70-25m scaled to 23 cm including detailed building instructions.
Dubus 2/2021 ... with ZS6JON

Applied Conversion of Segmented Wires from NEC2 to 1296 MHz Yagi Elements
Insulated through Boom BC based on SM5BSz's BC.exe with a fixed offset for 1296 MHz in interaction with the models segmentation density.
Dubus 2/2021 ... with SQ5ESM and ZS6JON

Coax Cable Two Way Dividers with improved Performance
Dubus 3/2020 ... Luc Laplante, VE2ULU with DG7YBN

Update to Sky and Earth Temperatures for VHF/UHF Amateur Radio Bands
An abstract of development of modern radio astronomy and terrestrial radio noise measurments, leading to a proposal for an up to date set of sky and earth radiation temperatures for simulations in the VHF/UHF range.
Dubus 2/2019

Low Noise Contest Stacks
VHF Contests are an excellent opportunity for long distance QSOs. Same time they demand optimizing the station for this purpose. The antenna with its directivity is the only selective member on the frequency span on which we like to receive the weak station.
63. VHF Convention Weinheim / Conference Transcript (2018)

Simulation of the 128 x 11 Ele. 70 cm Yagi EME array built by DL7APV
Simulation this very large Array by building the model using EZNEC and computing it in 4nec2 using the nec2dxs11k kernel.
Dubus 2/2018

Very Long 432 MHz Yagis with High G/T - Part 1
Thoughts about forward development of Yagis with 30 plus elements for the 70 cm band where increasing internal losses start to spoil low Antenna Temperature unless a bit of pattern cleanness is sacrificed.
Dubus 2/2018

Antenna G/T Calculators with Open Source Code, Part 4, F5FOD with DG7YBN
Relating method to DJ9BV's breaking article "Effective Noise Temperatures of 4-Yagi-Arrays for 432 MHz EME".

Dubus 4/2017

VHF / UHF Low Noise Yagis - Why swap to a new design?
Development history, why Antenna-G/T does matter, System-G/T and Antenna-G/T, qualification of Yagis for stacking and more ...

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62. VHF Convention Weinheim / Conference Transcript (2017)

Designing a Kilowatt plus 144 MHz Cross Polarised Yagi
General discussion on building details and important parameters for cross Yagis. Introduction of a high power symmetrising line with 1/2 inch Cellflex and how to feed both planes dipoles with that without interfering with other plane

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Dubus 3/2017

Antenna G/T Calculators with Open Source Code, Part 3, F5FOD with DG7YBN
History and why the AGTC was developed as an own programm, including interestung references

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Dubus 3/2017

70 cm EME-QSOs with low Power and small Antennas
Basics, equipment, hints and the history on the record breaking EME-QRPP QSOs at MX0CNS/M0ABA (in German)

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Funkamateur 6/2017

Antenna G/T Calculators with Open Source Code, Part 2, F5FOD with DG7YBN
A program computing Antenna Temperature and -G/T from the usual Far Field Tables generated by EZNEC and 4nec2 with mathematical pattern rotation for elevated antennas

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Dubus 2/2017

Calcul de G/T Logiciels de calcul Open Source, F5FOD with DG7YBN
Basics about Antenne-G/T and introduction of the concept of the AGTC antenna temperature and G/T program (in French)

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Radio REF 29145, Mar. 2017

Antenna G/T Calculators with Open Source Code, Part 1, F5FOD with DG7YBN
A lite version of a program computing Antenna Temperature and -G/T from the usual Far Field Tables generated by EZNEC and 4nec2 that does without pattern rotation for elevated antennas

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Dubus 1/2017

Influence of Plastic covering a UHF Yagi Element
How much do element holders, insulators and end caps work in the frequency response of a 70 cm Yagi-Uda? A set of measurments and their evaluation gives basic hints for better corrections on real builds

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Dubus 4/2016

You can! Low Budget 70cm EME
'Hartmut DG7YBN and Thomas M0ABA report on their successes with low power EME operation on the 70cm band'. How to build and operate a QRPP 70 cm EME station based on a pair of GTV 70-7n Yagis

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Practical Wireless 9/2016

2 m & 70 cm High Performance Power Splitters
Adjustable Power Splitters that provide a very good Return Loss without the need to work out a closest match between diameters of inner and outer tubes used or getting the core length 100 percent

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Dubus 2/2016

Construction of a 432 MHz GTV 70-19m Blade Yagi
A lightweight, yet effective Low Noise Yagi thanks to 4 mm elements mounted through boom with SM5BSZ's BC.exe applied. Building plan for a design with easy tuning and uncritical behaviour due to the broad sheet metal 'blade' dipole element

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Dubus 4/2014

SM5BSZ’s BC.exe modified for frequency scaling and tested on 432 MHz
Details on the BC.exe in its freq. scaling version, portation to VBA and integration in the DG7YBN Yagi Elements Configuration Tool

. Plots and details of test-Yagis with a 'semi DJ9BV' style element mounting through boom for 432 MHz with BC.exe numbers applied.
Dubus 4/2014

Stacking beyond DL6WU - Part 3
Antenna G/T wise advantages of vertical 4 or 6 Yagi stacks on UHF against common H-frame arrangements for extraterrestrial communication
Dubus 3/2014

Stacking beyond DL6WU - Part 2
Diamond Stacking compared to DL6WU by normalised effective aperture areas (with Slobodan Bukvic, YU7XL), an introduction to phase shifted stacking schemes, Phased Arrays, Stagger Stacking in pairs and larger groups with explicite notes on how to feed such systems
Dubus 1/2014 & Dubus Technik XIII

Stacking beyond DL6WU - Part 1
Basics like phase shift in the Yagi-Uda Antenna, pattern qualification for various stacking goals, background on DL6WU formula and analogy to Wave Optics. Pictured explainations on Effective Apertur Area in context to stacking and more
Dubus 4/2013 & Dubus Technik XIII

Yagi Design: Aspects according Copyright and „Good Manners“
How to act inside the expected code of conduct when showing others Yagi designs on the internet and why Radio Amateurs should not copy designs or parts of them without seeking permission.
Dubus 1/2014

O pojmu G/T za VHF/UHF antene - Part 2

Article - Notes on VHF/UHF Antenna G/T - in Serbian, tnx Slobodan Bukvic, YU7XL,
on courtesy of Dubus-Magazine
Serbian SRS, Radio Amater 1/2013 - click to view as PDF on YU1SRS web

144/432 MHz Long Yagis with a bent Driven Element
GTV Yagi Series using a V-shape DE to transform to 50 ohms,
designed for best G/T ratio and high F/B
Dubus 1/2013 & Dubus Technik XII

O pojmu G/T za VHF/UHF antene - Part 1

Article - Notes on VHF/UHF Antenna G/T - in Serbian, tnx Slobodan Bukvic, YU7XL,
on courtesy of Dubus-Magazine
Serbian SRS, Radio Amater 6/2012 - click to view as PDF on YU1SRS web

5-8 ... an extendable 144 MHz Yagi
Explicite plan for building a convertible 5 to 8 element Yagi plus hints for stacking
Dubus 4/2012 & Dubus Technik XII

4nec2 goes TANT
How to derive Far field Tables for TANT with 4nec2
Dubus 3/2012 & Dubus Technik XII

Notes on VHF/UHF Antenna G/T
Antenna G/T vs. System G/T, Proposal on corrected Sky and Earth Temperatures
Dubus 2/2012 & Dubus Technik XII

Applied Conversion of Segmented Wires from NEC to 144/432 MHz Yagi Elements
Part 4 - Simulating the Folded Dipole
Dubus 1/2012 & Dubus Technik XI

TANT Appendix

How to build a 4 Yagi array in NEC in compliance with the VE7BQH G/T Table (with VE7BQH) plus a detailed view on all parameters in the G/T Table
For download as PDF at EA6VQ's www.DXMAPS.com

Issued 9/2011

Applied Conversion of Segmented Wires from NEC2 to 144/432 MHz Yagi Elements - Part 3
Background and additional info to part 1 & 2
Dubus 2/2011 & Dubus Technik XI

Applied Conversion of Segmented Wires from NEC2 to 432 MHz Yagi Elements - Part 2
On Boom BC for Standard Insulators on 432 MHz in interaction with models segmentation density
Dubus 1/2011 & Dubus Technik X

Applied Conversion of Segmented Wires from NEC2 to 144 MHz Yagi Elements - Part 1
On Boom BC for Standard Insulators on 144 MHz in interaction with models segmentation density
Dubus 2/2010 & Dubus Technik X

TANT Manual

Pictured step-by-step official manual (with YU7EF and YT1NT, who programmed TANT) on how to derive a NEC model for TANT and run it.
For download as PDF at EA6VQ's www.DXMAPS.com

and www.YU7EF.com

Issued 7/2009

∗ ∗ ∗ Dubus

is a bilingual (English/German) written magazine
for Ham-Radio on VHF/UHF and Microwaves ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗

About DG7YBN in Media & by other Authors

Rothammels Antennenbuch
by Alois Krischke, DJ0TR, issue No. 13, 2013, pg. 221
DG7YBN-Speisung : Showing my Quarter Wave Line DE feed solution ("Viertelwellensperre")

Japanese "CQ ham radio" magazine
by Michiaki Watanabe, JH1KRC, issue 2014, May No.5, pg. 190ff
EME - Earth-Moon-Earth column: Showing some designs as the GTV 2-12 mk2 and motivating importance of Low Noise Yagis
Link to Japanese CQ ham radio magazine

British Practical Wireless
by Tim Kirby, G4VXE, "World of VHF" column.
Reporting about the Moonbounce record MX0CNS to HB9Q and DL7APV with a GTV 70-2 and 60 W. Issue Febr. 2017, pg. 55

British Practical Wireless
by Tim Kirby, G4VXE, "World of VHF" column.
Reporting about the Moonbounce QSO that M6EBQ at MX0CNS did with DL7APV with a GTV 70-17m and 10 W. Issue Febr. 2018, pg. 42

Known Bugs in Publications

Dubus 1/2011, Applied Conversion of Segmented Wires from NEC to 432 MHz Yagi Elements
What? Geometry of the 5 elem. Test Yagi, 20 x 20 mm boom, D1 = 323.8
Right: 20 x 20 mm boom, D1 = 319.0

Dubus 1/2012, Applied Conversion of Segmented Wires from NEC to 144/432 MHz Yagi Elements - Part 4 - Simulating the Folded Dipole
What? Fig. 9: 11 wires
Right: 11 segments on the wire, not 11 wires
What? Last passage, pg. 32 - typo in call "DB7WY"
Right: Dear Wolfgang's call is DB6WY

Dubus 2/2012, Notes on VHF/UHF Antenna G/T and TANT Appendix
What? Chart of Y-Factor for isotropic radiator, y-scales notation is "Temp [K]"
Right: as it is a ratio of Kelvin / Kelvin it is [ / ], no unit, simply the Y-Factor

Serbian SRS, Radio Amater 6/2012, O pojmu G/T za VHF/UHF antene
What? Kelvin as K° ... , translators bug
Right: just K, Kelvin as is a unit on its own

Dubus Technik XII, 144/432 MHz Long Yagis with a bent Driven Element, pg. 112 (fixed in magazine)
What? On 432 MHz the antenna temperature is approximately three times higher than on 144 Mhz ... , mothertounge correctors bug
Right: Because of the much larger Y-Factor on 432 MHz the antenna temperature has a much greater impact on the Signal/Noise Ratio at the antenna terminals than on 144 MHz.

73, Hartmut, DG7YBN