Изборник Затворити

Ознака: ham radio

Custom Morse Code for Mobile Phone Ring Tone

0 Коментара

Wouldn’t it be awesome to have Morse Code playing instead of plain ringtone on your phone? You would know who calls without need to reach phone. Of course it would require you to have skill of recognizing Morse Code, but that is minor issue, right? If you do not know it yet, it can be learned. It’s great skill to have, anyways.

Well, there is simple tool that may help: Morse Code Generator . It creates audio file with sound of Morse Code using your custom text. Generated sound is nice sinusoidal tone, pleasant for ears.

What you do is type in text phrase, choose Morse Code speed and Tone frequency and click button Generate. […]
[ ... види цео чланак ... ]

Dipole Antenna Center Insulator for SO239

0 Коментара

Building dipole antennas is always some kind of improvisation. Center insulator is quite simple and may be made in short time with jigsaw and drill.

As I jumped in CNC world I need some simple tasks to learn how to use FreeCAD and other software. So, dipole center piece is ideal just for that. I’ve finished project and learned a lot in the process.

Finished projects is uploaded to Thingverse: https://www.thingiverse.com/thing:4149187

You may use CNC mill or 3D printer to make this part. Pay attention to use material strong enough to survive possible strong forces. […]
[ ... види цео чланак ... ]

Universal CAT and programming USB to serial TTL interface for ham radio

, , 0 Коментара

Some years ago I posted article describing Universal CAT and programming USB to RS232 TTL interface for ham radio that I made.

Here is small update, adapter for YAESU FT-8900, FT-8800 and alike radios.

FT-8900 and FT-8800 and some other Yaesu radios use two wire interface. One wire is ground and other is both RX and TX. This is also known as CIV-I interface used in Icom radios.

CIV-I interface is quite simple. There is a diode (universal like 1N14148) connecting RX and TX, oriented cathode toward TX, with one 10K pull up resistor to 5V on RX. Here is schematics:

However, I found out that YAESU FT-8900 already provides pull up voltage on PKS line, so, there is no need for 10K pull up resistor. […]
[ ... види цео чланак ... ]

Вежбајте отпремање Морзеове телеграфије само са ручицом и рачунаром

, 4 Коментара

За усавршавање технике отпремања Морзеове телеграфије потребно је одвојити доста времена за вежбање. Згодно је ако то можете да радите кад год имате времена.

За то су вам потребни ручни тастер или ручица и тонски генератор. Тастер и ручица се набаве (сваки радио-аматер ваљда то већ има) а као тонски генератор се обично користи радио-станица или, ко се бави електроником, може и да направи.

Међутим, ако имате рачунар, он може такође да заврши посао. Постоји неколико програма који раде као тонски генератори а тастер и ручицу на рачунар повезујете преко серијског прикључка на рачунару.

MorseKeyer је један од таквих програма. Он служи као класични тон генератор за Морзеову телеграфију. […]
[ ... види цео чланак ... ]

Spiderpole 12m anchoring construction

, , 0 Коментара

Spiderpole 12m made by Spiderbeam is very useful for portable ham radio activities. To do the job it must be properly anchored. This pole may be anchored at the bottom (at about height of the first element) which allows it to withstand wind speed of abut 80 km/h, and at 7 meters high using guying lines (as recommended by manufacturer) which allows surviving windows of 120 km/h.

Anchoring at the bottom seems not suitable for portable, as it requires either to have already set strong short pole (fence or something) to attach pole, or dig one into the ground. Using guying lines seems more suitable for various situations. […]
[ ... види цео чланак ... ]