-------->> ex : F6EUQ / 74 .............................................ICW............................................

Saturday, February 22, 2014

QSL card ZS1II

My new customized QSL card is finished.

Thursday, November 7, 2013

Bye Bye D.R. Congo

Bye Bye 9Q1EK

29 Nov 2013 -In memory of 11 years in DR Congo with MONUSCO (Callsign 9Q1EK), I received the Gold Straight key from  Mr. Abdallah Wafy Deputy Special Representative for United Nations in the Democratic Republic of the Congo

30 November 2013, I will leave the DR Congo. I had some good and some bad memories, but overall an enormously fun in the piles-up with my exotic callsign.
A very big thanks to all ham radio everywhere in the world.
I will join my QRA in ZS and rebuild my station.
So for some time, the blog and the homemade equipment’s will be on standby.
73's Georges
24/11/2013 Loading container

Ready to go !

Kinshasa, 30 juin Boulevard
Amazing Young dancer

Saturday, September 21, 2013


Built in 2006 on the BBQ bench, I decided to rebuilt it today.
This coupler can work up to 15 KW SSB output from 160 m up to 10 m.
I included an integrated Bird Thruline® 7/8" Line Section wattmeter two sockets Plug-In Elements, with IN/OUT 7/16 connectors to indicates the forward and reflected transmission power,  for quick and accurate adjustment of the antenna. Tested on professional amplifier's site with 10 KW HF Amplifier  Marconi H1140 and  HF Amplifier ELCOR SW-20K

Usually, I don't like to use an antenna coupler, but I wanted to cover all HF bands (lower to upper), including WARC, and no other choice to go through a coupler.
Then, in 2006 in 9Q land (DR Congo), I built a Pi and I decided now to change with a T antenna coupler.
To be used with a 8 el. log periodic antenna (recover in a Kinshasa Embassy, (prob was observed as no linearity from 10 to 30 MHz) also for a 1,8 Mhz long wire INVERTED L 3/4 lambda with my OM2500 PA.
I was lucky to find a couple of vacuum CV in an old broadcast HF transmitter. The major problem was that these CVs have the adjustment not by rotation but by extension. How to solve it? Not easy, but I had to adapt in the 9Q land with spares parts of gearbox car !!!! with a system of rotary screw and nut fixed on the axis of the CV. Also rotary counters removed form old tape recorder.. CV support and coupling made with 1cm thick Green Teflon PTFE.

A little big, yes! But the main thing was that I could work with these CV. I used this system for more of 30.000 QSO.
Over a long period, I managed to accumulate the necessary parts to rebuild it and I found, couple of parts as dial vacuum CV.
Two models, one from Russian surplus and the other VIC as a copy of Jennings .
 CVDD-1000-15S   (25 to 1000 pF)  and CVDP 2300-15S (50 to 2300 pF)
I had to adapt the Russian model for fixing, but I preferred to use the VIC model.
I also found some vacuum relays as B2B, RJ2B-26S  and Roller Inductor in Auxerre France, Hamfest.
For the time being, I don't use the balanced antennas, I omitted  to install the balanced output in the coupler and I do not plan to spend a two-wire line in the shack. If I will use it one day, the balun will be outside the shack with a ladder line to the antenna.
So, except to find a way to make or find the shaft insulated coupling, the rest is only a matter of assembly.
So far, so good....I managed to match any combination with some antennas that I needed for max tune.
- 3 x 10 kw HF Amplifier  Marconi H1140

Some Pics in 2006..

Thursday, September 5, 2013

1.3 GHz and 2.4 GHz RF Signal Source

For my application to the optimization of : Yagi antennas, loop - Feed Horn - dish - Preamplifiers - RX, etc ... on the bench or outside.
In the past, I‘ve built a  few small RF signal sources of 13 and 23cm with 20mhz crystal and oscillator 40mhz TTL computer. It worked, But:
- Harmonics that interested me was a bit far from what I wanted to 23cm (1200, 1240, 1280 MHz), 13cm was OK ... (2320, 2360 MHz).
- Stability problem.
- Frequencies images generated by the other harmonics.
- Phase Noise .
- Need to add filters.
So, for serious action and not wanting to invest in not portable expensive trading lab equipment, and also used only occasionally,
I went on Stabilized Oscillators PLL fixed frequency from Kuhne DB6NT 1296.1 MHz and 2320.1 MHz.
It will be used for 1296 MHz and 2320 MHz with antenna Biquad - ¼ wave - Load 50 ohms - Attenuators. The power is ON only when battery 9Vdc 300 Ma is connected to the housing for each QRG.
For higher frequencies, I'll see later....! hi

Friday, August 23, 2013

Dummy load 50 ohms with RF Termination

August 31, 2013: 1.5 Kw DC-0,5 GHz Single dummy load done!

August 28, 2013:  800 w DC-1.6 GHz for Protection of 23cm LDMOS Amplifier by Circulator Done !

August, 23, 2013: With some recovery parts quite useful for the protection of my 1296Mhz Power Amplifier and also for measurements in the lab.
On the bench, two construction of dummy load 50 ohms with RF termination for:
1)    800 w for Protection by Circulator of the LDMOS 23cm amplifier.
2)    1.5 Kw Single dummy load for Lab Bench.
2 X RF terminations Innovative Power Product IPP TB216-100 (800w, 100 ohms; DC-0,5 GHz)
2 X RF terminations Innovative Power Product IPP RB214-100 (400w; 100 ohms; DC-1.6 GHz)
1 x Circulator VALVO VAM1081 and spare 1 X VALVO VAM1053A.
2 x HAMMOND Box.
2 X Fan ebmpapst 4182N.(119X119X38 mm)
2 X Heatsink 200x130x140 mm.
2 X N connectors.
2 X copper plate 6mm thick.
 ---  (updated on time...)