2023-10-10

Some thoughts and possible answers to the interference question.

Someone said; "It all goes away with load shedding!" - Yes the neighbour might not have a battery operated radio...

Potential Answer

I assume that the Ham radio operator has very good equipment, operates legally and is licenced. Could it be that the radio of the neighbour gets over loaded with spurious products from the radio's intermodulation distortion from the mixer; that could interfere with the neighbour's radio reception?

He could add additional filtering before his radio receiver that could remove the strong signals that overloads the radio receiver. I would say, add a high pass filter because the Ham operator transmits at HF 28MHz and the neighbour is listening on VHF 106MHz.

My response was:-

Yes almost right. You are not far off it. Remember the ham has a beam pointing North. Over the garden wall... Right at the neighbours house. And then think about 'image rejection'.

Noise has little to do with this 'interference' complaint. 'Cheap' FM radio/lo-fi and overloaded front end. Remember FM radios are local oscillator on the lower frequency side. They cannot be on the high side as the local oscillator would be in the aircraft bands.

Later

First of all think about the 3rd harmonic of 28.2 MHz. Then think about a 'low cost' FM radio having poor image rejection - second channel. The intermediate frequency of 10.7 MHz, means that the image is 21.4 MHz away from 702's Pretoria transmitter on 106 MHz...

You might need to reread the question. The Radio Amateur is using a recently bought transceiver that complies with the regulations. A beam that also is professionally made with only 400 Watts of output.

10.7 MHz is a global standard for an FM broadcast radio.

{--}

If you have a so called hi-fi tuner, you will probably have one with a plastic housing. No screening to speak of whatsoever.

Most Radio Amateurs will tell you to have a high-pass filter inserted in the antenna coax. To suppress the HF transmission. This will be of little use as the signal (Now around at Volts/metre) will bypass the filter and impact the tuner's front end directly. (screening of the receiver)

I picked 28.2 as an example frequency because I could remember 702 from the Pretoria transmitter is on 106 MHz. So the 'image frequency' would be 106 - 21.4. That is 84.6 MHz. The third harmonic of 28.2 MHz. This example also applies to the fifth harmonic. Which works out to be 16.92 MHz and is well out of band. So unlikely to be an issue! But the fourth harmonic would be 21.15 MHz. Another possibility. These harmonics would not be from the amateur's transceiver. But would be generated by the 'front end' circuits in the radio receiver. All of this can be summarised as a 'failing of the receiver'.

On this weekend I tried my phone's VHF FM radio. When I scanned the band, it found 47 radio stations here in Roodekrans! So the potential for interference is high. Also - as can be seen by the cartoon - the Radio Amateur will get the blame.

So whilst the radio receiver is technically at fault, try explaining that to your neighbour!

The radio amateur should first of all have a LOG of all his transmissions. So that he can refute claims of interference by referring to his LOG's time and date and frequency.

Secondly he should not be transmitting a full 400 Watts into a beam antenna. Especially on 10 Metres. When the band 'opens', the power level can be reduced to below 50 Watts or even 10 Watts.

Thirdly the radio amateur should offer to assist in solving the 'issue' with his neighbour. With a proviso that he doesn't spend money or a great amount of time. Some 'issues' could take some solving!

One solution that occurred to me was that the coax down lead to the radio receiver might be picking up more energy at HF than the front end could handle. Therefore a "Braid-Breaker" might resolve the 'issue'. So some experimentation would be needed. After all a recent anecdote had a plasma television wiping out HF for a nearby amateur! The coax to the roof antenna was resonant at 40 metres!

 

From a very old QST magazine.



An 'Interference Question' for Enhancing Thought Processing


This question was triggered by a couple of 'issues' I experienced some years ago. We no longer call them 'problems'. But INTERFERENCE is a huge issue and increasing in trouble level every day!

This is in no way an exam question as it is not a multiple choice answer.

I would like you to think about the 'mechanism' of this interference question.


A Radio Amateur in Gauteng has an H.F. transceiver putting out 400 Watts and a beam antenna pointing north towards Zimbabwe.

His neighbour next to his property is to his north and is listening to 702 on VHF FM on 106 MHz.

The ham has a sked with his friend in Zimbabwe on 10 metres. They have chosen to use 28.200 MHz.

After a few minutes of transmitting, his neighbour shouts at him over the fence. "You are wiping out my 702!"

He ignores him and they switch to narrowband FM on 28.2MHz. (Check the IARU Region 1 Band plan.)

The neighbour now goes to his garage and gets a loudhailer. Shouting "Now I can hear you plain as day!"

[There are various points here that should give you pause for thought.]

 

Questions

  1. Explain the mechanism using simple maths and the knowledge from previous lessons.

  2. Who is at fault? Or What is at fault?

  3. What should the Radio Amateur do?

 ------------------------------------------------

28000 - 28070 200 CW 28055 kHz - QRS Centre of Activity

28060 kHz - QRP Centre of Activity

28070 - 28120 500 Narrow band modes Digimodes 28120 - 28150 500 Narrow band modes Digimodes, automatically controlled data stations (unattended)

28150 - 28190 500 Narrow band modes

28190 - 28199 International Beacon Project Regional time shared beacons, exclusively

28199 - 28201 International Beacon Project Worldwide time shared beacons, exclusively

28201 - 28225 International Beacon Project Continuous duty beacons, exclusively

28225 - 28300 2700 All modes Beacons

28300 - 28320 2700 All modes Digimodes, automatically controlled data stations (unattended)

28320 - 29000 2700 All modes

28330 kHz - Digital Voice Centre of Activity

28360 kHz - SSB QRP Centre of Activity

28680 kHz - Image Centre of Activity

29000 - 29100 6000 All modes 29100 - 29200 6000 All modes FM simplex - 10 kHz channels

29200 - 29300 6000 All modes Digimodes, automatically controlled data stations (unattended)

29300 - 29510 6000 Satellite Links 29520 - 29590 6000 All modes FM-Repeater input (RH1 - RH8)

29510 - 29520 Guard Channel

29600 6000 All modes FM Calling channel

29610 6000 All modes FM Simplex-Repeater (parrot, input + output)

29620 - 29700 6000 All modes FM-Repeater output (RH1-RH8)

This is the HF Region 1 'bandplan'. Remember it is only a plan or recommendation.

So your decisions as to who is at fault, may or may not be 'legal'.

[I didn't intend for this to complicate the question.]

The 'thinking' about the process of interference is what I am after. Enjoy the puzzle.

Don't just go to the following pages. Understand the question first. Try and work out the means of the interference to the FM VHF radio.

73 John ZS6WL


 


2023-10-02

yl.beam #121 oct 2023

Contents

Oceania DX Contests
YL Raisa to promote Ham Radio in Croatia 7 Oct 2023, Saturday
9A1P Hosts 2nd Annual Istra contest conference- ICC 2023
"SPRING 2023" CERTIFICATE Argentina
HamSCI: Where Science Meets HAM Radio:
HamSCI Solar Eclipse QSO Party October 14, 2023
The Scientific Magic of Total Solar Eclipses
DARC e.V. YL-Referat - German Yls contest work-shop
West Rand Ladies Field Day
Japan YL Booth at JARL Ham Fair 2023, August 19 - 20
VK2VMP HMAS Vampire - Australian National Maritime Museum
Silent Key - PD0HMF Francina Heida – Pijl & VE1PDZ Shelley Marie James – Finn
Contact & Calendar
*****

 

Oceania DX Contests
The first and second weekend of October brings us the Oceania DX Contests
Oct 7-8 Phone
Oct 14-15 CW
ALARA - YL Memorial Plaques:
The Florence McKenzie (Mrs Mac) Award is for the YL (“young lady”) Single Operator entrant from inside Oceania with the highest combined score in the Phone and CW sections.
The Australian Henry YL Award is for the YL Single Operator entrant from outside Oceania (i.e. the rest of the world) with the highest combined score in the Phone and CW sections
These awards recognise two women who have made significant contributions to amateur radio in Australia. https://www.oceaniadxcontest.com
*****

YL Raisa to promote Ham Radio in Croatia

Hamradio not only for men - by R1BG/OH7BG and VO1BIG "YL Raisa"
YL Raisa is feeling excited. 20 Sept 2023:
It's time to make waves from beautiful Croatia.
I will be happy to greet and meet you PERSONALLY there.
Yes! It's not just another online Event - it is a face-to-face rendezvous! 🤩
We need to see fellow radio enthusiasts eye to eye and ignite the passion for ham radio among the youth and encourage more women to join Ham Radio.
Therefore, I gladly accepted the invitation of a 9A1P team to this event.
My journey to Istra will be difficult (there are no direct flights between Russia and Europe at the moment). But I am glad to have the opportunity, as one of the speakers, to talk about my path, positive five-year experience in our hobby and also to do everything possible to popularize Amateur Radio at this conference offline, and also online after it.
YL in Hamradio 7 Oct 2023, Saturday / 14:15 - - 15:00

9A1P Hosts 2nd Annual Istra contest conference- ICC 2023
International Contest meeting for HF & VHF contesters. 6 – 9 Oct. 2023
Idea was born by 9A1P in 2019 due to lack of events of this kind in Europe.
Venue: Plava Laguna Hotel Materada, Poreč, Croatia ("Blue Lagoon")
Poreč is on the Adriatic coast of Croatia in the region of Istria, opposite the small island of Sveti Nikola. https://icc2023.9a1p.com/
*****


Editor: This event has passed but we do hope you were able to contact many of the Yls below.
"SPRING 2023" CERTIFICATE
5th Annual event hosted by the Radio Club La Rioja (LU1SF) Argentina.
September 15 - 30 2023, 00:00 - 23:59 UTC
participants must confirm contacts with the greatest number of collaborating stations in any band and mode possible, exchanging only callsign aand signal RS

Argentinian stations:
LU1SF RC La Rioja, LU5RC RC Catamarca, LU6DK RC Tomás Espora, LR1D Claudia, LU1DAS Sara, LU2DNF Yanina, LU1EQF Delfina, Lu1JCK Luciana, LU1JGG Claudia,
Lu1LAW Eliana, Lu1MME Monica, LU1RSV Valentina, LU2SMD Maria Monica,
LU2SYL Andrea, LU1XJJ Patricia, LU2BB Beatriz, LU2ELZ Liliana, LU2GAC Sarah, LU2HYL Rosa, LU2JBA Narella, LU2jWI Natali, LU3EZH Lucia, LU3FCA Patricia, LU3HHI Gabriela, LU3RNL Monica, LU3XMS Cristina, LU3YL Liliana,
LW3EXJ Maria from Los Angeles, LU4DJB Natalia, LU4ESZ Sandra, LU4JVE Nadia, LU4RAN Elvira, LU5HCV Claudia, LU5HOY Miriam, LU5ILA Leticia, LU5RAO Anabella, LU6HGO Graciela, LU7SNB Denis Marianella, LU4SNV Antonella Salome,
LU7sV Viviana, LU7UVV Vanesa, LU7YCH Chiara, LU8GCJ Alicia, LU8DMA Andrea, LU9DN Alejandra, LU8dOC Marcela, LU9ALS Fernanda, LU9JVC Virginia,
LU9SAX Lorena, LU9VYY Paola, LU9YBM Bianca.

Foreign Collaborative Stations
CA1AKL Alejandra Chile, CE1RFI Maritza Chile, CA3YHQ Johana Chile, XQ4NUA Leticia Chile, CO5ABC Barbara Cuba, CO7YS Adys Cuba, CX5ACG Gabriela Uruguay,
DL9YJ Yvetta Germany, HB9EPE Dora Switzerland, HB9FPM Eva Switzerland,
KP4NRF Nancy Puerto Rico, KP4QVQ Carmen Puerto Rico, WP4QME Judith Puerto Rico, PU2NQT Sylvia Brazil, PU3ESM Ester Brazil, PY2QL Barbara Brazil, VU2JFC Saborni India, VA3YLR Alicia Canada, XE1LOV Luzma Mexico, YV5EVA Ydorca Venezuela.
*****
The Scientific Magic of Total Solar Eclipses
Throughout the millennia, total solar eclipses have instilled fear in some people while inspiring others, as the Sun’s wispy corona reveals itself in fleeting moments The recognition that the Sun’s corona is the extension of the solar atmosphere into space, together with magnetic fields on the solar surface, is less than a century old.

Thought this was of interest!! 33, Anne ~ WB1ARU F/w - McKenzie Denton (KO4GLN):
HamSCI: Where Science Meets HAM Radio:
HamSCI, short for Ham Radio Science Citizen Investigation, is on a mission to bring together amateur radio operators, scientists, and researchers.
Together, we'll delve into the effects of solar eclipses on radio communications.
It's all about expanding scientific knowledge and nurturing a sense of community among radio enthusiasts. Engage in the Solar Eclipse QSO Party by making radio contacts during the solar eclipse and entering your QSOs into a contest log.
Familiarize yourself with the Solar Eclipse QP contest rules, propagation measurement techniques, and data reporting. Remember, every observation counts,
For information on event guidelines, propagation tips, and how to get involved, go to: https://hamsci.org/
follow on social media HamSCI Facebook Page 💬 HamSCI Discord Server 🐦 HamSCI Twitter

HamSCI Solar Eclipse QSO Party October 14, 2023
FoEIS (Festivals of Eclipse Ionospheric Science)
Inviting all amateur radio enthusiasts, scientists, and the general public to participate in the HamSCI Festivals of Eclipse Ionospheric Science.
These are public events organized by the HamSCI (Ham Radio Science Citizen Investigation) organization to coincide with solar eclipses.
Participants will use a myriad of radios and antenna configurations to make measurements of the ionosphere and observe how it changes as the eclipse passes overhead.
They also use the occasion to promote science education and outreach, particularly in the fields of radio communication and space weather.
For more information, please visit: https://hamsci.org/


Nathaniel Frissell from The University of Scranton has invited amateur radio operators to participate in “Solar Eclipse QSO Parties.” The operators will attempt to make radio contacts with as many other operators as possible in different locations. This endeavor aims to observe how the ionosphere, an electrically charged region in our upper atmosphere that aids long-distance radio communications, changes during the eclipses. Previous experiments have demonstrated that solar eclipses can significantly impact the electron content of the ionosphere, affecting the behavior of radio waves.

https://scienceblog.com/538334/nasa-selects-5-experiments-for-2024-total-solar-eclipse/
*****

DARC e.V. YL-Referat - German Yls contest work-shop
It's been a long time since our last YL contest work-shop took place.
Now it's almost time again.
Mareike DG6MBS and I, Michaela DL1TM, would like you to join our 8th. YL contest workshop on 21st /October 22, 2023.
For better planning, registration by October 7th, 2023 is necessary.
You can register by email, dl1tm@darc.de dg6mbs@darc.de
We are looking forward to your registration!
VY 33 by Michaela (Ela) Gondek, DL1TM
YL Spokesman District Westphalia-North
PS: It would be great if you also inform YLs who don't have internet. Please share - We are grateful for any advertisement!
https://www.facebook.com/photo/? fbid=6615450658547045&set=gm.1329604931254958&idorvanity=552438255638300
*****

 

The West Rand Ladies Field Day March 11-12, 2023
by Veronica ZR6TVK and Jack Kotzé, ZS6JJK
For the first leg of the 2023 SARL (South African Radio League) Field Day, the West Rand ARC (WRARC) decided to do something different (also lovingly known as the Woesrand! Ed.) A first for our club! A Young Ladies operating team with the Old Men providing technical support. We decided that an all YL operating team was a fitting plan to celebrate International Women’s Day. What a successful weekend it was, filled with QSOs from every division in South Africa and a couple of QSOs from the SADC Region. To every person that contacted us and wished us well, thank you. Your support is immensely appreciated. The ladies had a wonderful time with lots of giggles and jokes all around.
The WRARC Contest Team operated from the Baptist Church grounds on the mountain situated in Roodekrans, Roodepoort. The team met on Friday night to start setting up and of course enjoyed a braai (BBQ), a few members camped at the grounds. Thanks to our awesome technical team for setting up a perfect field station.
On Saturday morning the ladies were ready and waiting by 09:45 CAT to start calling and getting the Field Day Contest on the go. We had 5 YL operators - Alyscia le Roux, ZS6ALY; Beverley Van Tonder, ZR6BVT; Dienie Schnetler, ZS6DNI; Karin Andrew, ZS6MMA and Veronica Kotzé, ZR6TVK. We alternated during the contest and worked 10, 15, 20, 40 and 80 m bands throughout Saturday and Sunday.
Saturday night was spent enjoying each other’s company around the braai. A special mention must be made of Phillip, ZS6PVT and Beverley, ZR6BVT, they made the most amazing vetkoek!
On Saturday night around 22:30 CAT a freak wind came up and we had to run around to secure tables and tents, etc. Some antennae had to be lowered for safety.
It was wonderful to have a few of our RAE students visit. I could see the excitement in their eyes. I am sure they will be attending the next Field Day as operators.
All in all, this was a very successful Field Day Weekend for the WRARC team. I could see our “Technical Support Team” were itching to get on the radio and make a few QSO’s.
Thank you, guys, for the support and effort you made to give us the opportunity to enjoy this weekend.

 

A word from the OM Support team - Vaughn le Roux, ZS6VLR; Phillip van Tonder, ZS6PVT; Danie Schnetler, ZS6DPS; Glen Andrew, ZS6GGA and Jack Kotze, ZS6JJK.

Yip, we were green with envy as we were banned from touching a mic and we didn’t dare try. Lucky for us, the (not so) Young Ladies were not too demanding except when it came to the antennas. They wanted to operate on all the bands, not only 80, 40 and 20 m!
While we waited to be called to attend to a technical problem we chatted about radio, load shedding (electrical power cuts) and potholes. We complained about work and our neighbours’ noise making devices. Some prepared food and others enjoyed refreshments. Some moaned about the forbidden mic but altogether a splendid weekend with good company, good food and lots of laughs.” The moral of the story. Field Day is a grand way to enjoy a weekend with your radio family!

 

Note how difficult the OMs found the day! (LOL) (Vetkoek is a traditional South African fried dough often stuffed with a sweet or savory filling.)

*****

Japan YL Booth at JARL Ham Fair 2023, August 19 - 20
many people came to our JLRS (Japan Ladies Radio Society) booth. I would like to thank you for the opportunity to have fun talking with the people who visited us, including the 1st Eyeball QSO. We are also happy to have many beginner female hams visit us. We look forward to working with you in the future as well. Let's enjoy the radio!
We operated the JLRS corporate station "JA1YWM" from the venue using a handy-radio. Thank you very much to everyone who communicated with us. All the QSL cards we prepared have been issued, so we will hand them over to you . We will deliver to the stations that could not be reached via the bureau.
"JA1YWM" will be operated as a HAMttee member station from now on in Kiyosu City, Aichi Prefecture (JCC: 2035) , so please keep in touch with us.
https://ameblo.jp/jlrsblog/entry-12817183179.html?frm_src=thumb_module
*****
Editor: Seems an appropriate event for Halloween?
AUSTRALIAN HAMS OFFER A QSO WITH A 'VAMPIRE'
VK2VMP HMAS Vampire - Australian National Maritime Museum
A team of amateurs, led by Colin VK2JCC, has set up shop in the radio room aboard HMAS Vampire. “HMAS” stands for His Majesty’s Australian Ship, and the Vampire is located at the Australian National Maritime Museum in Sydney. The radio room is part of the museum, and thus open for visitors to learn about the importance of radio communications, both in wartime and in peace.
The Vampire team uses the callsign Victor Kilo Two Victor Mike Papa, VK2VMP. (VMP = Vampire) If you have never worked a warship, now is a good time to start!
So far, eight amateurs are on the roster to keep Vampire on the air, using CW and Sideband on 20 and 40 metres, and the station is now a permanent fixture on the ship.
So, listen out for HMAS Vampire in Sydney, Australia. And check VK2VMP on qrz.com.

PS: Q - What does “vampire vampire vampire” mean in the navy?
A - NATO code-word for a hostile anti-ship cruise missile.
*****

 

Silent Keys
PD0HMF Francina Heida – Pijl from Groningen Netherlands, went unexpectedly silent key 17 April 2023.
QRZ Forum: Our thoughts and prayers in these and upcoming difficult times go to her wife, family and friends.

VE1PDZ Shelley Marie James – Finn S/k [1 Sept. 1965 – 23 Aug. 2023]
The obituary of Silent Key, my wife, Shelley, VE1PDZ.
It is with broken hearts the family of Shelley Marie James-Finn, wife of Robert J. Finn wishes to announce her passing on Wednesday, August 23, 2023, at Bobby’s Hospice with her family by her side. Shelley was born in Saint John, N.B. on September 1, 1965, to the late Samuel Douglas and Carolyn (Pitt) James.
Shelley was very proud to be an Amateur Radio Operator, holding the callsign, VE1PDZ. She was also a member of the Loyalist City Amateur Radio Club and one of its past presidents..
Shelley is survived by her beloved husband, Robert J. Finn, twin sons, Eric Finn and Robert Finn, one sister, Nancy Ann James, nieces, nephews, and cousins.
Shelley is predeceased by her parents, S. Douglas and Carolyn James.
VE9EE Robert James Finn · 25/08/2023
****
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.

 

October 2023
Oct 4 - 10 World Space Week Wed – Tues
Oct 6 – 9 Istra International Contest meeting 2023 Croatia
Oct 7 YL Raisa to promote Ham Radio @ ICC- Croatia
Oct 7-8 Oceania DX Contest Phone - website https://www.oceaniadxcontest.com
Oct 8 RSGB DX Contest
Oct 08 Japan Ladies Radio Society (JLRS) "YL CQ Day" 09:00 UTC+09 – 16:00 UTC+09
NB. "YL CQ Day" will be delayed by one week, to October 15th, as 2nd Sunday is
JARL's "City-wide All-County Contest".
Oct 13 - 15 RSGB Convention Milton Keynes
Oct 14 HamSCI Solar Eclipse QSO Party 1: 2023 (1200Z-2200Z)
Oct 14-15 Oceania DX Contest CW website https://www.oceaniadxcontest.com
Oct 20 JOTA
Oct 20 - 22 ARRL Pacificon Div Convention,
Oct 21 HamExpo 2023 - Le Mans (France) Saturday -YL's Free https://hamexpo.r-e-f.org/
Oct 21 - 22 DARC e.V. YL-Referat - German Yls contest work-shop
Oct 21 – 22 Worked all Germany contest;1500Z, to 1459Z,, 2023
Oct 21 -23 YLRL - DX/NA-YL Anniversary Contest SSB/CW/Digital
UTC Oct 21- 0200 UTC Oct 23
Oct 27 26th Zombie Shuffle :Friday Nite, Mode: CW; 80, 40, 20m; QRP 5 watts
Oct 28-29 CQ WW DX SSB contest
Oct 28, VERON, Dutch radio society. 61st Ham Radio Convention at Zwolle, Netherlands.

Oct 31 Halloween,Tuesday, celebrating Eve of All Hallows day, aka All Saints' Day.

Nov 01 Silent Key Memorial Contest http://www.skmc.hu/en/rules.html
1st Nov 0600 UTC to 0859 UTC every year. Mode: CW only
Nov 1-4 IARU Region 1 General Conference, Serbia