| QRP CW
Transceiver 144 MHz with VXO and direct conversion |
A simple construction 2m
transceiver, which myself give set in two days . RF power 500 mW, stable VXO with two switched crystals - for-tuning 500 kHz. An ideal rig for unpretending portable operation. |
| QRP 500mW transceiver 3.5 MHz with A244 |
CW transceiver for whole 80m band
with direct conversion and very little consumption. Suittable for power supply from battery. |
| Mini QRP CW transceiver 3.5 MHz |
A very simple minitransceiver
with VXO in 80m band - used "TV" crystal 3579 kHz. RF power 800 mW, on RX part in the mixer only ONE diode... but listening. |
| PA 5W for 80m band with KU611 |
Power amplifier for 3.5 MHz band,
power supply 12V. It requires 500 mW input for full power 5 Watts. Self-bearing construction.
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| Mini ATU for portable LW aerials |
A small antenna tuner for tuning especially LW antennas on portable position. The tuning reel by motion ferrite stick. It has an built-in antenna current meter so myself behind-come round also without SWR meter. |
| CW/SSB
RX for 80m band with direct conversion |
A portable receiver for 80m band,
supplied 9V battery 6F22. The RX has a very good sensitivity, for listening is 1m of wire
is well. The heart of receiver is A244, I utilized the internal oscillator of this one. I use it often for searching lamps produces interference on the habitation. |
| PA 5W for HF transceiver with KT907 |
Power amplifier with maximal RF output 5W for range 1.8 až 30MHz. It allows fluent regulation of power output from hundreds microwatts to 5W. The active element is one KT907 (KT904), power supply 24V.
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| TRX Pixie 2 for 80m band |
Amazing simple CW transceiver - power output 150mW, feeding 12V.
No adjustment, no tuning, no align and any band available after change Xtal and output elements! "Cult" rig for us - QRP hams.
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| VFO for radio Nivea II for 20m band |
External oscillator for childrens telegraph QRP transceiver designed by Petr OK1XGL for acquaintance
and experimenting with radio technology and communication techniques.
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| SWR meter - bridge with LED diode |
Very simply resistored SWR meter with superbright LED diode for 1.8MHz to 50MHz bands and power 10W max. An ideal indicator for portable operation.
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| Menos es MAS |
An ultra-minimalist 80m transceiver originally built by Michael AA1TJ for the MAS (Minimal Art Session) event.
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| SOTA antenna for HF with 1:1 balun |
Wire antenna for HF SOTA activation with balun - cheap, lightweight and most important - it no needs any tree for support. Ideal for naked summits.
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| L-TUNER with SWR indicator |
Antenna tuner wired as L-network with maximal inductance 26microhenry on the Amidon toroide T130-2 and switcheable capacity in/out. Built-in SWR meter. Tuner is small a lightweight, capable for portable and SOTA operation.
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| AUDION 4.6 - 38.5MHz |
Superregenerative receiver - audion switchable range capable for 8 HF ham bands. Power supply internal 9V battery 6F22, current consumption only 5mA.
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| AUDION 800kHz - 35MHz |
Superregenerative receiver II - audion switchable range capable for all 10 HF ham bands. Power supply internal 9V battery 6F22, current consumption only 5mA.
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| Very sensitive SWR meter for QRPP to 30MHz |
Very simply SWR meter with resistive bridge for 1.8MHz to 30MHz bands and power from 2mW do 5W. An ideal hardware for QRP a QRPP mW operation.
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| TRX Pixie 7023kHz for 40m band |
Simple CW 40m transceiver with RIT, power output 300mW, power supply 12V. Chinese kit for 4€ with some my modifications. It works for first wiring without any alignment and tuning. "Cult" rig for us - QRP hams.
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| RF milivoltmeter 20Hz - 1000MHz |
RF voltmeter measures in range 50mV to 10V in wide frequency range. Supplied by one alkaline cell AA LR6 1.5V.
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| Shortwave 10 bands TRX ATLAS 5W QRP |
I built HF transceiver CW/SSB Atlas with little changes by almanac from Ham radio meeting TATRY 1984 where is complete building instructions. TRX has regulated power output from 1mW do 5W.
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| ROB - ARDF receiver for 80m band |
Compact receiver for whole range 80m band - 3500 až 3800kHz sourced with 9V 6F22 battery. RX is very sensitive and directional on integrated ferrite rod antenna. The dimensions of the receiver are 122 x 66 x 30mm. |
| Power amplifier PA 5W for TRX M160B and its modifications |
Design and installation of integrated PA 5W with KU611 for 1.8MHz TRX M160B and device modification. Now TRX has switchable output power of 1W and 5W. |
| GDO 170kHz - 264MHz |
GDO - Grid Dip Oscillator - dipper - with only one semiconductor BF256C by SM0VPO. Possibility to connect an external frequency counter. Supplied by one alkaline cell 23A 12V.
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| Modifications TRX QCX 40m |
Mods of rig QCX 7 MHz - modification AF volume control and moving the CW filter center frequency from 700Hz to 480Hz.
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| Fixing RTL SDR RX BA5SBA 100kHz - 1.7GHz |
Fixing USB RTL SDR receiver type BA5SBA 100kHz - 1.7GHz with upconverter 100MHz. Wrong factory-fitted SMD crystal oscillator 100MHz.
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| Speech processor for FT817 |
Voice compressor for electret or dynamic mike for transceiver FT817. Based on module with MAX4466 a SSM2167.
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SM0VPO - Harry's Homebrew Homepages