Kategorija: Telekomunikacije

My First World Castle Award Activation (WCA YU-00023)

Skraćena veza: https://pedja.supurovic.net/veza/7468

I did my first World Castle Award activation. Although it is mid February, weather forecast was sunny and warm for today, so I planned to go outdoors. As I live very near WCA YU-00023 (Stari grad, Užice) I decided to pack up my gears and walk to the old fortress and make an activation. I was accompanied by a non-ham friend.

As I am preparing for portable operations, this was nice opportunity to check how my equipment behave.

Basically, it is YAESU FT-857 with portable three band linked dipole (80, 40 and 20m), one LiIon 14.4V 5Ah NL202HD battery and another sealed lead acid 12V 7Ah battery. […]
[ ... vidi ceo članak ... ]

Universal CAT and programming USB to RS232 TTL interface for ham radio

18. 1. 14. Radio-amaterizam, Samogradnja 10 Komentara

Skraćena veza: https://pedja.supurovic.net/veza/7437

As soon as I got first two ham radio rigs, I needed to connect them both to PC, to program memories or use CAT control from logging software. I realized that it is impractical to have as many USB to RS323 adapters as rigs.

As serial connection for radio requires just RX, TX and GND lines, and it is the same for most of modern radio stations. It is actually only radio connector that is different – signaling is the same.

It showed up quite easy to build simple multirig adapter. All you need to do is to use existing USB to serial interface adapter, cut it’s cable in two and insert male and female three pin 3.5 mm jack (commonly used as stereo audio connectors). […]
[ ... vidi ceo članak ... ]

Ocena signala u digitalnim vezama

6. 11. 13. Radio-amaterizam 0 Komentara

Skraćena veza: https://pedja.supurovic.net/veza/7355

Primenom digitalnih modulacija u radioamaterskim komunikacijama pokazalo se da klasična RST ocena signala koja se primenjuje za telegrafiju nije pogodna.

Stoga je osmišljen nešto drugačiji sistem ocene signala koji se koristi za ove načine rada koji se označava kao RSQ. Ova ocena signala takođe sadrži tri informacije ali drugačijeg značenja.

R (Readability) – čitkost

Čitkost izražava procenat ispravno primljenog teksta. Ova ocena je nastala iz običaja operatora da pored klasične ocene signala daju i podatak o procentu primljenog teksta.

R5	95% – 100%	Savršeno čitko
R4	80% – 95%	Poneki ispušten znak
R3	40% – 80%	Dosta ispuštenih znakova
R2	20% – 40%	Tek poneka reč je čitljiva
R1	0% – 20%	Neprepoznatljiv tekst

S (Strength) – jačina signala

Merenje jačine signala S metrom radio prijemnika je nepouzdano jer digitalni signali su veoma uskog spektra tako da prijemnik može istovremeno da čuje (mnogo) više stanica te S metar u stvari pokazuje neko srednje merenje svih tih primljenih signala. […]
[ ... vidi ceo članak ... ]

How to use Baofeng UV-B5 flash light switch for LCD background light

26. 8. 13. Radio-amaterizam 22 Komentara

Skraćena veza: https://pedja.supurovic.net/veza/7318

Soon after I got him this nice walkie-talkie, my brother Nenad (YU1TTL) quickly found out how to overcome missing feature of UV-B5: LCD background light is turned on only when some keys are pressed and stays on far a very short time. He managed to use flash switch which is used in UV-B6 version but in UV-B5 has no function.

He decided to put up instructions on my blog so others can benefit of this modification. So here it is:

How to use Baofeng UV-B5 flash light switch for LCD background light

by Nenad Supurović YU1TTL

These are instructions for disassembling Baofeng UV-B5 walkie-talkie and also how to modify it to enable the third (Flash light) button to switch the LCD and keyboard back-light on/off

Disassembling:

1. […]
[ ... vidi ceo članak ... ]

YU množitelji

8. 8. 13. Radio-amaterizam 11 Komentara

Skraćena veza: https://pedja.supurovic.net/veza/7287

U takmičenjima koje organizuju srpski radioamateri kao množitelji se upotrebljavaju prilagođene auto-registarske oznake. S obzirom da nigde nisam mogao da nađem pripremljenu mapu množitelja niti listu množitelja za evidenciju u takmičenjima, morao sam da ih napravim.

Da ne bi i vi morali sami da ih pravite, postavio sam na blog da ih možete preuzeti u PDF formatu i odštampati.

yu-multipliers-map.pdf

yu-multipliers-list.pdf

[…]
[ ... vidi ceo članak ... ]

Radioamaterske frekvencije UHF (432 MHz / 70 cm)

7. 6. 13. Radio-amaterizam 8 Komentara

Skraćena veza: https://pedja.supurovic.net/veza/7152

Plan frekvencija na opsegu 432 MHz

Podopseg	Vrsta emisije	Dozvoljena snaga (W)
Podopseg	Vrsta emisije	I kl.	II kl.
432.000-432.150	CW	1500	–
432.150-432.500	CW, SSB	1500	50
432.500-432.600	Linearni transponderi (ulaz)	30	30
432.600-432.800	Linearni transponderi (izlaz)	–	–
432.800-432.990	Radio – farovi	–	–
432.994-433.381	FM repetitori (prijem)	30	30
433.394-433.581	FM simpleks	30	30
434.000-434.594	Digitalne veze	50	30
434.594-434.981	FM Repetitori (predaja)	–	–
434.981-438.000	Satelitske veze	75	75

Repetitori

Kanal	Stara oznaka	Predaja [MHz]	Prijem [MHz]	Pomak [MHz]
RU368	RU0	434.600	433.000	-1.600
RU369	RU0X	434.6125	433.0125	-1.600
RU370	RU1	434.625	433.025	-1.600
RU371	RU1X	434.6375	433.0375	-1.600
RU372	RU2	434.650	433.050	-1.600
RU373	RU2X	434.6625	433.0625	-1.600
RU374	RU3	434.675	433.075	-1.600
RU375	RU3X	434.6875	433.0875	-1.600
RU376	RU4	434.700	433.100	-1.600
RU377	RU4X	434.7125	433.1125	-1.600
RU378	RU5	434.725	433.125	-1.600
RU379	RU5X	434.7375	433.1375	-1.600
RU380	RU6	434.750	433.150	-1.600
RU381	RU6X	434.7625	433.1625	-1.600
RU382	RU7	434.775	433.175	-1.600
RU383	RU7X	434.7875	433.1875	-1.600
RU384	RU8	434.800	433.200	-1.600
RU385	RU8X	434.8125	433.2125	-1.600
RU386	RU9	434.825	433.225	-1.600
RU387		434.8375	433.2375	-1.600
RU388		434.850	433.250	-1.600
RU389		434.8625	433.2625	-1.600
RU390		434.875	433.275	-1.600
RU391		434.8875	433.2875	-1.600
RU392		434.900	433.300	-1.600
RU393		434.9125	433.3125	-1.600
RU394		434.925	433.325	-1.600
RU395		434.9375	433.3375	-1.600
RU396		434.950	433.350	-1.600
RU397		434.9625	433.3625	-1.600
RU398		434.975	433.375	-1.600

Simpleksni kanali

Kanal	Stara oznaka	Frekvencija [MHz]
U272	SU16	433.400
U273		433.4125
U274	SU17	433.425
U275		433.4375
U276	SU18	433.450
U277		433.4625
U278	SU19	433.475
U279		433.4875
U280	SU20	433.500
U281		433.5125
U282	SU21	433.525
U283		433.5375
U284	SU22	433.550
U285		433.5625
U286	SU23	433.575
U287		433.5875

Listu frekvencija u CSV formatu, koju možete učitati u program Chirp, preuzmite sa https://pedja.supurovic.net/chirp-iaru-r1-repeaters-and-simplex-channel-list […]
[ ... vidi ceo članak ... ]