Rallies and Events News – 7 July 2019

This Sunday, 7 July, the Barford Norfolk Radio Rally will be held at Barford Village Hall and Green, Barford, Norwich NR9 4AB. Doors open at 9am, with talk-in on S22. There will be trade stands, a car boot sale, a bring-and-buy, raffle, repeater groups, catering and free car parking. Entry is £2 per person, with […]

DX News – 7 July 2019

Saty, JE1JKL will be active as 9M6NA from Labuan Island, East Malaysia, IOTA reference OC-133 between 11 and 16 July. He will concentrate on the 6m band using FT8. QSL via Logbook of The World and Club Log’s OQRS. Janusz, SP9FIH returns to Bethlehem in Palestine from the 6 July to 3 August. He will […]

Special Event News – 7 July 2019

GB1CMS will be operating this Sunday, 7 July, at a display of military vehicles and battle re-enactments located seven miles south of Dorking in Capel, Surrey. A listening watch will be maintained on 51.60MHz and a full list of frequencies can be found via tinyurl.com/yx92b4uy Grey Point Fort ARS will be open for visitors during […]

Contest News – 7 July 2019

The RSGB VHF National Field Day ends its 24 hour run at 1400UTC today, the 7th. Using all modes on the 50 to 1.3GHz bands, the exchange is signal report, serial number and locator. This Sunday, the 7th, the 3rd 2m Backpackers Contest runs from 1100 to 1500UTC. Using all modes, the exchange is signal […]

Propagation News – 7 July 2019

Good news—this week saw two sunspots appear from the upcoming solar cycle 25. We know this due to their magnetic polarity and locations close to the solar equator. Unfortunately, the sunspots didn’t last very long before vanishing. But it is a start. Earlier this year, an international panel of experts predicted that solar minimum would […]

News for Scotland – 7 July 2019

From this Sunday to next Sunday, Cockenzie and Port Seton Amateur Radio Club has activity days. More information from Bob, GM4UYZ, on 01875 811 723. Edinburgh and District Amateur Radio Club has its net on Monday. Next Saturday sees a social evening. Contact Norman, GM1CNH, on 0774 094 6192. On Tuesday Dundee Amateur Radio Club […]

Why Balance Batteries – Specifically Li-Po’s?

 

A question was raised at the Club recently as to why we balance Li-Po’s and not cells such as NiCad or NiMh’s?

I certainly knew it was ‘done-practice’ in order to obtain maximum performance from Li-Po’s, but why not do the same for other battery types?

There is a good write-up in Wikipedia (click the graphic) as to why this is done.

And – the bottom line – it appears, that it could be done with most types of battery packs, which in the end would improve their performance and extend their longevity – just as Li-Po’s.

So now you know!


Edit 05/07/19:

Following on from some questions raised on our Members Forum #73  –  HERE is some additional information about Active Balancing and associated circuits, courtesy of Analog Devices.

What Is A Dxpedition?

IOTA

By CE2MT Marisa Tobella, Los Andes, V. Chile

An expedition or Dxpedition is an operation carried out by an amateur radio operator or a group of them from an “exotic” or “weird” place, radially speaking due to their remoteness, their complicated or restricted access, or simply because they do not exist or are very few resident radio amateurs who practice DX.
But what is the grace of transmitting from these places you would think because we could spend our lives without them and nothing happens.
What happens is that there are programs leading to the obtaining of diplomas such as the IOTA program (Islands on the Air) or the DXCC (Dx Century Club), the first one divides radio amateurs in Chaser or island hunters and in Activators or expeditionaries ( who perform the operations) if you wish to pursue and get these Awards (Diplomas) you will love knowing that a group of operators will put on the air a very elusive island that is just the one you need. In order to regulate the IOTA diploma program, a significant number of islands or groups of islands have been identified and numbered under the same name, for example: –
SA 018 Call area CE7   LOS LAGOS REGION SOUTH group (= Acui, Alao, Apiao, Caguache, Cailin, Caucahue, Chaulinec, Chaullin, Chauques Isls [namely Anihue, Aulin, Buta Chauques, Cheniao, Mechuque, Tac, Taucolon], Chelin, Chiloe, Coldita, Colocia, Deserters Isls [namely Ahullini, Chuit, Chulin,
Imerquina, Nayahue, Talcan], Dona Sebastiana, Guafo, Guapi Quilan Isls, Guar, Laitec, Lemuy, Liliguapi, Linacre, Linguar, Lin Lin, Lipipe, Llancahue, Llingua, Maillen, Meulin, Pelada, Puluqui, Quehui, Quenac, Quenu, Queullin, Quinchao, Redonda, San Pedro, Tabon, Teuquelin, Tranqui
More information on its website: https://www.iota-world.org/es/
The DXCC program, which is a registered trademark of the American Radio Relay League, is also a program of permanent diplomas that offers diplomas in different categories according to the number of entities contacted and confirmed, modes and types of operation (mobile and QRP, CW. , SSB, Etc.) The DXCC program maintains an official list of entities that may or may not be a country because for geo-graphical or political reasons some places count as a country, the case of Hawaii that despite being  United States count as a different entity or the Chilean Antarctic or Easter Island that despite being Chilean territory count as different entities.
To qualify for some of the Awards (Diplomas of the DXCC program you must prove that you have contacted the entities indicated by physical QSL cards to check a Card Checker (radio amateur volunteers who check that everything is in order or electronically through the Logbook of the World (loTW)
Information about the DXCC program here: http://www.arrl.org/dxcc
Logbook of the World here: https://lotw.arrl.org/lotwuser/default
How a Dxpedition works:
The group of operators or operator will try to spend as much time as possible on the air and will transmit in all bands and so that their respective licenses, the regulations of the country and the technical aspects allow them. Its objective is to contact as many stations and entities as possible and will be available to all radio amateurs in the world who wish to contact them.
And how do you participate? 
Well the main thing is to have patience, to  STUDY and LISTEN A LOT before you start talking silly. Inquire on the expedition’s website about the bands and modes in which they will be active, and the dates between which the operation will take place. Help yourself with the reports of the Cluster to see if there are stations in your country that are making contacts, study the propagation reports for the date, listen carefully, normally the operators work in SPLIT when they have many stations calling them (they listen on one frequency and they transmit on another) do not do the crazy calling where there is no one to listen to them, have patience wait for your chance as the more powerful stations leave because they already “worked” the Dxpetition, when your possibilities increase. Many times the operators also divide and call with some requirement: for example Stations with Number 2 in the call, or callsigns, ending in M, or only South America stations, etc.
Listen and listen patiently your opportunity will come.
Some DX Clusters here:     http://www.dxsummit.fi/#/         http://www.bcdxc.org/ve7cc/
https://www.dxfuncluster.com/
Propagation here:       https://www.dxmaps.com/spots/mapg.php...           http://lu4aao.org/propagation

144 MHz and the WRC process

RSGB has been a key part of a joint International Amateur Radio Union (IARU) effort and are working hard on both national and international levels to ensure a positive outcome for World Radio Conference-19 (WRC-19) items (50 MHz, Wireless Power, microwave bands etc) and WRC-23 Agenda proposals (144-146 MHz and 23cms). With regard to 144-146 […]

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