Thursday, July 28, 2005

Amateur Radio Orienteering - Hunter's Tool Box

Many thanks to "Lim KC" 9M2LC "Lim KC" from Penang for his contribution on ARDF Amateur Radio Directional Finding or Fox Hunting home brew equiptment. His design is very simple to build to be used together with the "3 Element Measuring Tape Antenna ".

Therefore it was born the "Amateur Radio Direction Finding Penang Group Home Page "

We hope to have have this type of sports some day in Kuala Lumpur.

Happy Fox Hunting... Hams !

Selecting your Callsign

Do you know how Amateur Radio Callsigns are
given out?

Go to the above link to MCMC for more info.

Table below is taken from their guidelines.

Monday, July 25, 2005

You can build your own radio receiver!

Here is a homebrew project for '80 metre band' from 3.5 to 3.9 MHz short wave radio band taken from a NewZeland Ham Radio website

Listen to AMATEUR RADIO Signals!

You can build your own radio receiver!

Tuesday, July 19, 2005

Using Eqso & Echolink

Malaysian Amateur operators who want to join the internet
Ham Community using either E-Qso or Echolink software,
please be advised that there is a requirement for your
Class Assignment Licence to be verified by Eqso & Echolink

When the software has been downloaded and installed
to your PCs, and before it can be used, your Class Assignment
Licence copy has to be emailed/faxed to them for their
Subsequently, then only can the software be activated
by inserting the registration code and
password. (In the case of Echolink).

Full details are available from the web pages where
the applicable software can be downloaded.

Wednesday, July 13, 2005

E QSO Computer to Ham Rig Interface Card

We are presently making a Interface Card for trial based on a circuit below designed by Peter G4KQU.
For those who would like to make their own cards suitable for their rigs, more information is available at the link below:

Components for Circuit
3 x 1k ¼ watt resistors
1 x 1.2k ¼ watt resistors
1 x 1k Potentiometer lin
1 x 2.2uF 50v capacitor
3 x 0.01uF capacitors
2 x (T1 & T2) 600 ohm transformers type 9000 RS Number 208-822
1 x IC1 optocoupler 4N25 RS Number 597-289
1 x Red LED (High sensitivity type)
1 x Diode 1N4148
2 x 3.5mm Stereo plugs
1 x 9 Pin D plug ( Com port 1 or 2) & cover
Screened cable - Project Box


Do you know Series - 8

Another 20 Questions for all to try out !

1. Having established contact on a calling frequency it is good practice to:

(a) stay on the same frequency
(b) move to another frequency
(c) invite others to join in on the same frequency
(d) be objectionable to all others calling

2. The purpose of a terrestrial repeater is to:

(a) increase satellite coverage
(b) increase the range of mobile stations
(c) increase the range of fixed stations
(d) minimise contacts by pedestrian stations

3. The Q-code for 'standby' is:

(a) QRN
(b) QRM
(c) QRS
(d) QRX

4. COIL using the phonetic alphabet would be:

(a) Charlie, Oscar, India, Lima
(b) Charlie, Ocean, Italy, Lima
(c) Coil, Oscar, Inductance, London
(d) Charlie, Oscar, Italy, London

5. The Band Plans should be observed because:

(a) they are mandatory
(b) they are governed by international regulations
(c) they are intended to aid operating
(d) they are only for novices

6. It is good safety practice to:

(a) use plastic piping for earthing
(b) unearth all metal cases
(c) have no master switch
(d) supply all mains power via a master switch

7. When calling a station it is good practice to:

(a) put your callsign first
(b) use your callsign only
(c) put the callsign of the station being called first
(d) use the callsign of the other station only

8. In the RST code T is for:

(a) temperature of PA stage
(b) tone
(c) time of transmission
(d) transmitter type

9. To prevent annoying other users on a band, a transmitter should always be tuned initially:

(a) on a harmonic outside the band
(b) into an antenna
(c) into a dummy load
(d) into a dipole

10. Two 10kW resistors are connected in parallel across a 5V DC supply. The total current taken is:

(a) 50mA
(b) 0.5mA
(c) 1mA
(d) 1 A

11. The diagram represents a trace on an oscilloscope. What is the frequency of the displayed waveform?

(a) 1kHz
(b) 5kHz
(c) 10kHz
(d) 100kHz

12. In the diagram in question 11, what is the peak to peak value of the waveform?

(a) 1V
(b) 2V
(c) 10V
(d) 20V

13. As the frequency rises, the reactance of an inductor:

(a) stays constant
(b) decreases
(c) increases
(d) does none of these

14. The resonant frequency of the circuit is:

(a) 1.59155kHz
(b) 15.9155kHz
(c) 159.155kHz
(d) 1591.55kHz

15. A power gain of 4 is equivalent to:

(a) 3dB
(b) 6dB
(c) 10dB
(d) 16dB

16. What type of Transistor is shown in the following diagram?

(a) PNP
(b) BNP
(c) NPN
(d) PNB

17. If the base potential of an NPN transistor is held at the emitter potential, the collector current will be:

(a) zero
(b) always 1A
(c) between 10mA and
(d) very high

18. The output impedance of an emitter-follower buffer amplifier is:

(a) infinite
(b) very high
(c) zero
(d) fairly low

19. The circuit shown below depicts:

(a) an audio amplifier
(b) an RF amplifier
(c) a mixer
(d) a BFO

20. The circuit in question 19 operates in what type of Power output mode ?

(a) Class A
(b) Class AB
(c) Class B
(d) Class C

Adapted from UK Amateur Radio project website