Remote Controlled Antenna Switch

Skraćena veza: http://pedja.supurovic.net/veza/7497
Antenna switch in a stack

Remote controller for antenna switch in a stack

As I live in apartment building I have apparent problem with setting up ham radio antenna. The obvious place to set up antenna was the roof as it  is easily accessible. Due to small space and me not wanting to make mess of a wires, I decided to use compromise vertical multiband. A friend had spare DunaX-GPN4B (40, 20, 15 and 10m) so it was obvious choice. I had to put down about 30m of coax cable to my apartment, and soon I was in the air.

Not for long I found out that I do miss 80 meter band a lot. […]
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Koliko snage emitujete?

Skraćena veza: http://pedja.supurovic.net/veza/7483

Nepresušna tema u radio-amaterskim razgovorima je snaga radio-stanica. Ma koliko da je imamo, to nikada nije dovoljno. Uvek su na ceni jače radio-stanice, a mnogi radio-amateri ne smatraju svoju opremu zaokruženom ako ne nabave neki pojačavač snage.

Interesantno je da je prvi korak u povećanju dometa obično povećanje snage predajnika. Nažalost to ume da ode i dotle da se izlazi iz okvira propisa i emituje snagama koje su daleko veće nego što je to dozvoljeno, a da rezultati ne budu baš odgovarajući.

Mnogi su se uverili da prosto povećanje snage ne da nije uvek nego često uopšte i nije rešenje. […]
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My First World Castle Award Activation (WCA YU-00023)

Skraćena veza: http://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.

YT9TP WCA YU-00023 Activation

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. […]
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Universal CAT and programming USB to RS232 TTL interface for ham radio

Skraćena veza: http://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). […]
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Ocena signala u digitalnim vezama

Skraćena veza: http://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. […]
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How to use Baofeng UV-B5 flash light switch for LCD background light

Skraćena veza: http://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. […]
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YU množitelji

Skraćena veza: http://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.

yu ham radio multipliers map

yu ham radio multipliers list

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


Podelite ovaj članak sa prijateljima

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Radioamaterske frekvencije UHF (432 MHz / 70 cm)

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

Plan frekvencija na opsegu 432 MHz

Podopseg Vrsta emisije Dozvoljena snaga
(W)
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 http://pedja.supurovic.net/chirp-iaru-r1-repeaters-and-simplex-channel-list. […]
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