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Author Archives: lz4ny
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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ampr-ripd and Amprnet Net-44 notes
In early 2012, Heikki Hannikainen, OH7LZB (the ham behind aprs.fi) modernized the amprnet routing by writing a custom RIPv2 daemon to receive RIP updates from the 44/8 ampr.org routing service, and insert them in the Linux routing table. This has replaced the encap.txt and munge script method. Continue reading
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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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Meteo support in Android
Mini meteorological station Vratsa now supports format application for Android devices, which is by application Pocket PWS (have it in Google Play). Continue reading
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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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