My first CW QSO using QO-100

Using a setup for which I had made done some calculations, tonight I was testing the QO-100 (CW / 2.4 GHz on the uplink and 10.4 GHz on the downlink) when a German station (DL3GAK, Udo) called me.

Despite being with the helix antenna (home made) in the hand, outside the window (!!!!), the signal produced is more than enough to make QSOs.
My performance as an antenna rotor was poor because I produced a lot of QSB when I’m looking to other stuff…

Next step will be the production of more helix for the OMs of the Quinta do Lambert Amateur Radio Society*…
Just after that I will put up all antennas in the rooftop. That will take a litle longer because it will be necessary to attach all equipment in a watertight box.

I would like to thank the many OMs who had shared their knowledge, some of which are Portuguese.

TKS ! CU at QO-100!

A close view of the 19 turns homemade helix

* This Amateur Radio Society doesn’t exist but we are 3 OM that live really close by and we like to call ourselves that way…


Es’hail sat2 /QO-100 – RX with LNB only!

Tonight (06MAR2019) , me and João, CT7ABE, were able to receive SSB just holding an LBN (no parabolic dish). Wow! 🙂 🙂

Thanks to all that were envolved in this awesome project.

A small video that capture the moment!

Vy 73 de Pedro, CT1DBS/CU3HF

Spray-On Antennas Could Be the Wave of the Future, University Researchers Believe

02/10/2018 – Thanks to DrexelNow    

See video about it 

Researchers at Drexel University’s College of Engineering report a breakthrough in nanomaterials technology that promises to make installing an antenna as easy as applying sunblock or bug spray. The University reported the research in a DrexelNOW article, “Drexel’s Spray-On Antennas Could Be the Tech Connector of the Future.” The advance could mean wearable and invisible antennas that could find their place in the next generation of the Internet of things (IoT), and even have Amateur Radio applications.

“The ability to spray an antenna on a flexible substrate or make it optically transparent means that we could have a lot of new places to set up networks,” said Drexel Wireless Systems Laboratory Director and engineering professor Kapil Dandekar, a co-author of the research published recently in Science Advances.

“This technology could enable the truly seamless integration of antennas with everyday objects which will be critical for the emerging Internet of things,” Dandekar said.

In their paper, Dandekar and his colleagues laid out a method for spraying invisibly thin antennas made from a type of two-dimensional metallic material called MXene — a conductive, two-dimensional titanium carbide material — which can be dissolved in water to create an ink or paint. They said the exceptional conductivity of the material enables it to be employed as an RF radiator even when applied in a very thin, nearly invisible coating. The MXene antennas perform as well as those now being used in mobile devices, wireless routers, and other devices, the Drexel researchers said. In addition, the MXene materials were shown to be 50 times better than graphene and 300 times better than silver ink antennas in terms of preserving the quality of RF transmission.

“Current fabrication methods of metals cannot make antennas thin enough and applicable to any surface, in spite of decades of research and development to improve the performance of metal antennas,” said Yury Gogotsi, director of the A.J. Drexel Nanomaterials Institute, who initiated and led the project PhD. “We were looking for two-dimensional nanomaterials, which have sheet thickness about 100,000 times thinner than a human hair; just a few atoms across, and can self-assemble into conductive films upon deposition on any surface. Therefore, we selected MXene as a candidate for ultra-thin antennas.”

“The MXene antenna not only outperformed the macro and micro world of metal antennas, we went beyond the performance of available nanomaterial antennas, while keeping the antenna thickness very low,” said Babak Anasori, a research assistant professor in the A.J. Drexel Nanomaterials Institute. “The thinnest antenna was as thin as 62 nanometers — about a thousand times thinner than a sheet of paper — and it was almost transparent.”

Unlike existing nanomaterial fabrication methods that require several steps, the Drexel research team’s spray-on antennas can be fabricated in a single step by airbrush spraying a water-based MXene ink, Anasori said.

Failed activation! CT/BL-004, Serra da Freita

19FEB2017, AM

After long time without any Sota activation due to a respiratory infection, the weather forecast indicates that Sunday will be a sunny day. 🙂
It will be a cold but sunny day!
So, I decided to give a try to my lungs!

Early in the morning I went to Serra da Freita Power station and parked the car.
It was a perfect day for this time of the year, with a cold and strong wind. But who cares ?

My first bad decision was to take advantage of a tree instead of erecting the fishing pole.
A rock helped to launch the string over the tree. Then the rope get tangled in a branch.
The half burned pine tree shown no cooperation… Fires in the summer are enough. A SOTA activator seems to be too much!

But one should never give up, right ?!

Second launch and the rope was not in the correct position. So, I pulled a little.
Bingo! The rock turn around a branch and now is firmly tie to the stubborn pine tree!

Pulled from several directions and nothing!
So, the fishing pole was used to untie the rope and the rock .
Problem solved just after 40 min… 😦

Another small pine tree are waiting to hang the end of the rope…
Easy one. The rock will be used as weight.

My thought at that time was”…unwrap the wire, erect the fishing pole and it’s done. I will be on air.”

But things are never that easy…The small twigs left by the burn bushes made the task very difficult. The wire get rolled up and… It seems to be an easy task!…
At this point I start laughing ! It took me over 1 hour just to have the wire in the air!

Everything set, let’s CQ CQ on 60m…

What could go wrong ?!

I notice something strange in the SWR of the KX-2. At beginning the tune is perfect and SWR=1:1. Shortly after the SWR increased!
I stop. Checked SWR with ATU: “All systems go”…
Starting CQ again. CQ CQ CQ SOTA DE [SWR going up]. Stop.
Less power. Same problem…
Let’s give a try in another band. Same behavior!
Forcing CQ, I get one spot on 14 MHz (6 dB SNR in G-land)…
ZERO answers, no QSOs!

One must to understand when it’s a “no day”! 🙂

So let’s enjoy the mountain and forget SOTA, i e, phase 2 of Sunday.

And that went smoothly! (Look at the pictures…)

Vy 73 de Pedro, CT1DBS (formerly CT1DBS/p…) 🙂 🙂 🙂


CT/ES-002 – A garden, a palace, a view and CW novices!

18DEZ2016 AM


Text will be placed here ASAP



Perfect sunday morning at CT/ES-010, Monte Serves

11/12/2016 AM
Text in English will be placed here ASAP

Rapidamente combinado na noite anterior com o João Fragoso, CT7ABE, pelas 09h30 deste domingo seguimos a curta viagem até ao sopé do Monte Serves.

Ao longe as pás das eólicas quase não rodavam com falta de vento e, apesar de alguma humidade, o sol mostrava-se num céu pouco nublado.
Um dia perfeito para uma activação SOTA! 🙂 🙂 🙂

Fomos apreciando as vistas na rápida subida e, ao chegarmos lá em cima, cada montou o seu shack, costas com costas, no marco geodésico de primeira ordem.

O CT7ABE usou 5W num dipolo com traps e este escriba usou 5W, numa antena end fed long wire, sendo que a parte mais alta do fio estava suportado nos cabos telefónicos que atravessam a zona…

Combinadas as bandas de trabalho, lá fomos alternando e tentando não interferir um com o outro.
Contudo, na zona, sentia-se, por vezes, uma forte emissão que além de QRM propriamente dito chegou a dessensibilizar o RX… 😦
Isto foi sentido pelos 2, sendo que a situação afectou mais o CT7ABE/p. 😦

Às 10h41 fiz o primeiro QSO, em 20m/CW, seguindo-se, depois, mais 16.
Dos 17 QSOs há a registar os simpáticos factos:
– Dois QSOs com estações CT em CW;
– Um QSO com ZL (Nova Zelândia), já confirmado via Clublog;
– Um S2S com o CT7AFR/p.

Antes que alguém pergunte, o rápido QSO com o CT7AFR foi feito em SSB, utilizando o microfone de um auricular e, confesso (!!!), com 10W PEP (aumentei a potência do KX-2 para o nível máximo que ainda é considerado QRP)…
Este QSO foi feito pelo meio de italianos e logo a seguir a um QSO do CT7AFR com o Manuel, EA2DT, que também é “cliente habitual” desta estação aquando de activações SOTA…

Uma radiosa manhã de sol que deu para espairecer as pernas e fazer rádio.

Obrigado aos caçadores!

73 do Pedro, CT1DBS

CT/BA-012, Candal. EU NA SOTA S2S Party, 19NOV16 1400 – 1700 UTC

EuropeNorth America SOTA S2S Party, 19NOV16 1400 – 1700 UTC
I left the car at Fraguinha (nice lagoon and camping), climbing between the ravaged forest due to fires in summer.

The wx was cold and windy.

Between 1438z and 1546z 32 QSO were made in the 20, 17 and 15m band, all cw.

Of those, 4 were with North America (NA).
3 S2S, only one with NA : N1EU.

EU in suffix should mean something in this kind of events!… :wink:
Tnx Barry!

I decide to quit before sunset because the mountain was almost engulfed by the clouds (1106 m high) and wind was stronger and stronger. And the temperature started to decline drastically.

I descent in the middle of the mist but I had the chance to view some fallow deer that crossed the path. They disappeared before I could take the camera out of the pocket but they were a nice view in a mountain that had no people in this cold day!

I reach the car when it starts snowing.

What a nice day!

Thanks everyone who took part. Looking forward for the next! :smile:

Vy 73 de Pedro, CT1DBS