Wednesday, May 30, 2012

Rekaman

Menyadur tulisan dari sebuah website yang menampilkan rekaman kegiatan di radio

Menggunakan frekuensi selama ada ijin dan sesuai dengan aturan yang ada ya sah-sah saja untuk memancar, tapi "Membiasakanlah yang benar jangan membenarkan yang biasa". Tapi gunakan lah frekuensi sebagai sumber alam yang terbatas sesuai dengan peruntukan nya...



Dikutip dari : http://radio-tims.blogspot.com.au/ 

Link yang ditulis pada blog nya adalah : http://radio-tims.blogspot.com.au/2012/05/indonesian-horse-racing-on-7000khz-and.html


Link yang lain nya  adalah di monitor on IARU Region -1 : http://www.iarums-r1.org/iarums/sound/7000-ins.wav



Berita terbaru adalah surat langsung dari Chairman of Directors IARU region 3 di ditujukan langsung kepada Mentri Kominfo bapak Tifatul Sembiring perihal penyalahgunaan frekuensi.
Berikut ini copy suratnya:


SATURDAY, MAY 5, 2012

Indonesian Horse Racing on 7000kHz and 11425kHz

http://www.youtube.com/watch?v=jTWsNvR80xk

This is one of those odd things that makes shortwave radio so intriguing. I first heard these strange chanting on 7000kHz LSB a few years back and have been running into them quite frequently. In December I found the same phenomenon outside of the Amateur bands on 11425kHz USB and recorded it, which I have presented a short excerpt for you.

Many people have theorised as to what these strange chanting are about - from number stations to some sort of call to prayer. I believe they’re from Indonesia and are using identifiers to chant over one another to see who is able to be heard above the rest. K9RZZ on the radioreference.com forums said amateurs used to call this “Horse Racing” and I’d have to agree with him. It sounds like they take turns being the MC, to judges who is the winner and to introduce the players to compete. The MC says start and the participants chant their Ids for twenty seconds or so. The winners from each round get to play off against each other until an ultimate winner is found, who gets to take home the prize hamper. This seems to go on for hours, the earliest I’ve hear them on air is about 1100z and the latest was 1700z (3am local) when I tuned out for bed (it may have kept going).

http://www.youtube.com/watch?v=hUncXt6C4OE

In this video you can hear the MC introducing the players and very enthusiastically starts their 20 second race by saying in English “GO! Go! GO! Go! GO!”

I’m located in Melbourne Australia and recorded it using a Soft66ADD SDR joined to a 10m vertical antenna.

If you have any other clues or ideas please post them in the comments.

WELZ SP-10X

Portabel SWR and Power meter.

Spesifikasi sebagai berikut:
Frekuensi : 1.8 sampai 150MHz 
Maksimum Power rate : 200W 
Impedansi : 50ohm

SWR buatan jepang ini ternyata sangat sulit ditemukan. Disain SP-10X  ini yang dicari para penggemar stasiun radio bergerak.  Jika anda bisa dapatkan SWR jenis ini simpan sebagai koleksi, karena swr ini sangat praktis di gunakan, mudah disimpan di saku anda. Dan yang pasti dengan ukuran sebesar kotak rokok bisa handling power sampe 200W!!





Ini tampak atas nya sudah banyak karat2, sepertinya memang tipikal SWR jenis WELZ, bodi nya mudah sekali berkarat



Tampak depan agak mendingan, karatnya sedikit






Ukuran yang sangat praktis dibawa-bawa , dimasukan ke saku anda karena ukuran nya sebesar kotak rokok

Friday, May 25, 2012

JAKFOX 2012





PC Interface circuits for Digital Communications & CW

PC Interface circuits for Digital Communications & CW

Connection to PC is usually done through RS232 9 pin serial connector with the connector as shown in the somewhat lower. Note that the pin is important to be used in the circuit that we make is pin Request To Send (RTS), Data Terminal Ready (DTR) and Ground (GND). With the pin number 7 (RTS), 4 (DTR) and 5 (GND).

Component
Resistor 1K2 ohm
Diode 1N4148
4N33 optocoupler or Toshiba TLP521-1, TLP-521-2
PCB hole - for prototyping
Mic Connectors
Small stereo connector (make)
Mono connectors - for CW Rig (optional)
9pin RS232 connector (female)
Stereo cable a few meters





Interface circuit using the 4N33 for PSK31, RTTY, CW












Interface circuit using the TLP521






Interface circuit using PC817






RF protection circuit with feedback

Component
Resistor 1K2 ohm
Diode 1N4148
4N33 optocoupler or Toshiba TLP521-1, TLP-521-2
1:1 600 ohm transformer (rather difficult to find it)
100pF Capacitor
PCB hole - for prototyping
Mic Connectors
Small stereo connector (male)
Mono connectors - for CW Rig (optional)
9pin RS232 connector (female)
Stereo cable a few meters




Interface circuit for PSK31, RTTY, CW with RF protection Feedback





Interface circuit using the TLP521





Interface circuit using PC817


Circuit for Handy Transceiver


This circuit is OK for HT Alinco




Interface with TLP521 series for Handy Transceiver




Interface circuit with PC817 for Handy Transceiver


Circuit for Handy Transceiver ICOM





This series is better for HT ICOM
Interface with the 4N33 series for HT ICOM

Audio conversion circuit for CW to CW Key to Fldigi






RS232 9pin






RS232 9pin
The pins used are pin 7 (RTS), pin 4 (DTR) and pin 5 (GND).


ICOM MIC Connector

To facilitate colleagues not to search again attached the pins of the connector Mic ICOM.






ICOM Mic connector
Pin that is used is
pin 1 (MIC input)
pin 7 (Ground MIC)
pin 6 (PTT Ground)
pin 5 (PTT)

ICOM BACK PIN NO.: FUNCTION

4 8 12 16 20 24
3 7 11 15 19 23
2 6 10 14 18 22
1 5 9 13 17 21


1:Output from the squelch control stage. (+8V when the squelch is ON.)
2:13.8 volts DC interlocked with the power switch
3:Connected to the push-to-talk, T/R switch. When grounded, the transceiver changes to the transmit mode.
4:Output from the receive detector stage. Fixed output regardless of AF output or AF gain.
5:Output from the transmit MIC amplifier stage.(Input for the MIC gain control stage.)
6: 8 volts DC output while transmitting. (Maximum output current is 5mA.)
7:Input for external ALC voltage.
8:Ground.
9:Input for RTTY keying (MARK: HIGH level, SPACE: LOW level). The levels for MARK and SPACE may be reversed with an internal switch.
10:NC (no connection).
11:Input for TRANSVERTER control. Apply 8 volts DC to use a transverter with the IC-751 A.
12:Reference voltage output for band switching.
13:Band Control Voltage output.
14-24: NC (no connection).



How it Works The circuit

Work interface circuit for digital communications is actually relatively simple.
Software HAMSCOPE or FLDIGI or digital communications software running on a PC.
HAMSCOPE software can be set to control Pin RS232 RTS to be HIGH if it transmits.
HIGH signal on the RTS will enable Opto Coupler to be short on its output. If Opto Coupler connector Mic at the rig will transmit.
For CW operation, we can use the RS232 DTR pin of the plug into the Jack in the Rig through a series of CW Opto Coupler. So that we can type the keyboard only to send the CW.
To ensure there is no RF feedback from the radio equipment, we typically will use the Input Transformer with 100pF capacitors on the two sides of its equipment to isolate the PC from the Rig.
The problem is somewhat dangerous to the continuation PC to Rig ever experienced by the writer only to the volume of the rig. Make sure the volume is not too large, because if too much is likely to make the sound card in the PC becomes damaged.

Wednesday, May 23, 2012

SKYPPER Antenna

SKYPPER

   

Technical informations

Concept
The principle of this antenna is very simple: a normal 3 element Yagi with Director and Reflector in a V-shape.


The resulting antenna can be built using wire elements strung on a supporting cross.


The creator of this antenna system is Dick Bird G4ZU, in the ARRL Antenna Compendium Vol.3 he published this antenna project to single-band 10 meters and named it  “Bird-Yagi”.                                                     
The concept behind this antenna was developped by Cornelius Paul "Con", DF4SA. He has done a lot of work and development to a multi-band version he called "SPIDERBEAM".

Antenna parts
The antenna is constructed with a 7+ meter Vertical rod, 4 Horizontal rods at 2.75 meters each on a cross system all attached with simple copper-wire.



Antenna requirements summary
This antenna is perfect for Dx'peditions as it is:
1. Light (only 2,7 kg including a 8 meter fibreglass pole)
2. Easy to errect (no bolts or screws/5mins max)
3. No impedance adaptor or balun required.
4. Max power capability of 2kw.
5. Tough and durable (professional fisherman type fibreglass rods used)
6. Easily transportable (folds down to 1 meter)
When installing beam antennas it is better to get them errected as high as possible, because an antenna with less gain errected as high as possible will produce a better signal than one of a higher gain errected at a lower height.
It´s low weight makes it much easier to put the skypper-beam higher up and choose better locations.
Use it while travelling, activate a nearby mountain, island, castle or lighthouse, put it on the roof for a contest weekend, this antenna goes everywere you need high gain and very good performance!

Antenna Performance
forward gain is about 5dBd (7,2dBi) in free space (= 12dBi in 8m height above ground) and stays nearly constant over the whole band.
- F/B ratio is about 25dB or better
- SWR stays below 1:1
- BANDWITH: 26,5 to 28,5 down swr 2:1

On-the-air test´s confirm these results.
These are the simulations in NEC2 with the software “Antenna Optimizer”.
Like you can see, the pattern diagram is very selective, with noteable front-to-back performance around 27db . The vertical diagram pattern with the antenna at 8 meters height, presents the elevation peak at 18° with 12,14 dbi and 5,14dbi at 5°.


Free Space


Antenna 8 meters above ground

 

Vertical polarization
This is the next development of the Skypper beam: "the vertical polarization"!
It's very easy... it´s necessary to use only one 2 arms (and not 4) of the central cross, junted of the vertical pole with a isolant rubber.
Off course the gain are more low of the horizontal polarization, but the vertical radiation patterns are very interesting.



  
                                          





 Avertical polarization:  4 meters above ground

Comparsion with other antennas

This is the comparsion with other antennas ( Dipole, Vertical, X-Beam, Hex Beam, Moxon, 2&3 element yagis,1-2&3 element Quads).  All these antennas have something they are good at and this type of comparsion does not necessarily show the best features of each. For example, the X-Beam can have a low F/B ratio at high gain which I like as a contester;  the hex beam construction lends itself to multi-banding; the Yagi is good for interlacing, the vertical has good radiation at low angles, some are easier to match impedance,  etc, etc. More informations on: http://www.cebik.com/4.html
They are the parameter charteristic of this antennas, developed with AO software...
All modeling done in "Free Space", 27.6 MHz, Resonant (reactance=0), Al 6063-T832 tubing, dBi gain units, 20 segments/half-wavelength = ~21" / segment.
AO varies the dimensions of the antenna to best achieve the tradeoff specified, which were Gain 40%, F/B 40%, and Rx=0 20%; this results in an optimization that may be different from other comparisons.

Komunikasi dengan Mode Digital



Mencoba berkomunikasi dengan mode digital , skema didapat dari sebuah website yang kebetulan radio yg saya gunakan adalah kenwood FT-450 sehingga cocok sekali dengan sekaman nya,



 























Komponen nya mudah di dapat di toko-toko elektronik karena menggunakan komponenen standar yaitu berupa konektor DB9 untuk komuniksasi serial ke komputer , Trafro dengan impedansi 600ohms dengan rasio 1:1. Ada tiga optocoupler karena berfungsi untuk memutus hubungan dari radio ke PC. yaitu agar PC tidak terkena umpan balik RF dari radio. Sebenarnya tergantung penggunaan nya , kalau hanya untuk komunikasi digital saja, ya cukup hanya satu optokopler saja.



















Membuat satu buah interface dengan dua radio yang berbeda. Tambahkan saja satu buah konektor lain.



Blok diagram nya kira-kira seperti ini:






TU de YC1CWK