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Category Archives: Technics
FM Power Amplifier 88 – 108 MHz with BLY87A, BLY89A, KT920A, KT925B
A very simple fm power amplifier which can deliver 4W rf power with 12V power supply and BLY87A or KT920A and 20W with BLY89A or KT925B. Continue reading
Portable APRS Tracker + Messenger AprSVW
Portable APRS Tracker + Messenger
AprSVW – traker for aprs with display Continue reading
Posted in APRS, Constructions, Technics
Tagged aprs, aprs tracker, aprsvw, aprsvw v3, display, lcd, tracker
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SSB transceiver – “Balkan”
Ето накратко характеристиките на трансийвъра:
– Чувствителност в режим на приемане: не по-малко от 1 микроволт.
– Потискане на неработещата горна лента: 40–45 дб.
– Потискане на носещата в режим на предаване:50 дб.
– Изходна мощност на предавателя около 10W. Continue reading
Posted in Constructions, Technics, Transceiver
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Linear PA without HV trafo – gu50
This is very small and light PA, but with power more of 300W output in CW mode and 500W pep in SSB mode. In the PA there is not trafo for HV. The plate voltage is the quadrupled electrical mains AC voltage. Continue reading
Posted in Constructions
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Preamp for 2m with BF981
To improve one receiver simply adding an antenna preamplifier proved that is not at all easy. It must satisfy two very conflicting requirements. To improve sensitivity and to maintain the dynamics of the receiver. One excludes the other. Clearly … must compromise, but what? Continue reading
Posted in Constructions
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Direct Digital Synthesizer (DDS) VFO
This is a continuation of my previous DDS projects. This project uses PIC16F628A and AD9850 or AD9851. PIC16F628A is an 18-Pin microcontroller with 2K byte program memory, it is a FLASH-based and a member of the versatile PIC16F62XA family of low-cost, high-performance, CMOS, fully-static, 8-bit microcontrollers. PIC16F62XA devices have special features to reduce external components, thus reducing system cost, enhancing system reliability and reducing power consumption. Continue reading
Posted in Constructions
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A universal direct conversion receiver for PSK-31
Decode and read text message communications being sent over shortwave amateur radio frequencies. Continue reading
Posted in Constructions
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DSB QRPP mikro transceiver
This is a diagram of a very simple design of micro transceiver 21 Mhz built only 2 ICs (SA612 and LM386) and several discrete components, structures can easily be neglected and another frequency with recalculation and resetting the freewheeling circuit and change a quartz resonator. Continue reading
Posted in Constructions, Transceiver
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QRP BPSK transceiver in 80m
Благодарение на чудесните възможности на PSK31, PSK63 и компютрите се дава възможност с много прост трансивър с пряко преобразуване който работи на фиксирана честота с кварцов резонатор да се провеждат връзки с множество кореспонденти. Continue reading
Posted in Constructions, Transceiver
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Mini transceiver PSK – NIKI80
Trx niki 80 to proste i niewielkich rozmiarów urzadzenie nadawczo-odbiorcze przeznaczone do pracy emisją psk w paśmie 80m. o mocy wyjściowej 5W. Continue reading
Posted in Constructions, Transceiver
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