Results tagged #Hf in Circuits
HF linear amplifier circuit
The PA output Pi section consists of 2 variable Cs (20 - 120pF and a second (home made) 50 - 450pF switched in for the lower bands by a simp...
HF/VHF LCD PIC16F88 SWR Bridge
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HF VHF receiver diplexer
An Icom PCR-1000 listening to various MF, HF and VHF radio stations. However, there is a slight problem. Very slight, almost too small to ev...
HF transceiver
The choice of IF is usually determined from availability of filters with desired characteristics. For communication receiver or transceiver ...
HF to LF Converter
Any mode (e. g. CW, AM, SSB, FSK) which is initiated in the HF transmitter or transceiver can be regenerated at LF (100 to 200 kHz) using th...
Hf Preamplifier Circuit
This HF SW receiver preamplifier is comprised of a broadband toroidal transformer (LI-a and Ll-b), a complex LC network (comprised of a 160...
Hf Broadband Antenna Preamp Circuit
The HF/SW receiver preamplifier is comprised of a broadband toroidal transformer (LI-a and Ll-b), LC network (comprised of a 1600-kHz, high...
Hf Low-Power Cw Transmitter
Suitable for amateur use, this 1.5-W transmitter runs on a 12-V supply. Ql is an oscillator using a surplus FT2...
Hf Transceiver Mixer
The transceiver mixer and carrier oscillator in the band-imaging (7- and 14-MHz) CW transceiver. Careful selection of ...
HF SSB CW AM RF Linear amplifier
This is a rather unusual QRP Power Amplifier design, with a wide frequency response; within three dB's from 300KHz to 30MHz. Overall gain is...
HF phone rig for 20-40 meter band
A simple project, within most of homebrewers capabilities. Very simple tuning, a single stage to align, besides VFO frequency adjusting. Eas...
Vipor mutant portable HF/VHF/UHF
Most of us don`t have the luxury of building a 1/4, 1/2 or even a 5/8 wavelength vertical antenna for HF. We have to settle for something a ...