(root) / Designs / HAM_Constructions

Contest Interface

Contest interface is a small box containing all needed to connect standard transceiver to PC. It uses only USB interface to PC because it has its own sound card. Interface module is compatible with many standard transceivers. Only what differs is cable from interface box to transceiver.

Ultra small HF CW Transceiver

Very nice construction of the ultra small CW QRP multiband portable transceiver by Peter OK1XGL. The transceiver gives up to 5W. Receiver uses switched mixer so the IP3 is very good.

Info Battery Pack for Ultra small HF CW Transceiver (HF_TRAMP)

The NiMH battery pack for miniature SW transceiver HF_TRAMP. The battery is packed into the same small housing as transceiver itself and gives energy for up to 8 hours of work. The internal intelligence supervises charge and discharge processes and monitors the state of the battery. It is possible to charge the battery from any power source with voltage from 8V up to 22V capable giving 14W. The output current from the battery is limited to 2A.

Home measurement of RTX parameters

Is it possible to measure parameters of RTX at home? The text is trying to show, what is possible to measure on transceivers at home.

Phased Array SDR Receiver

Software defined receiver for phased array antenna systems. The digitalized signals and local oscillator clock is distributed over optical fibre channel.

Radio meteor transmitter station

Radio transmitting station for use in meteor radar detection based on network of RMDS system.

Radiotelescope

Reconstruction of radioastronomy instrument.

SDR Receiver

A improved design of well known DR2G software defined receiver. It is capable to work up to 200MHz but up to 450MHz with selected parts.

UHF SDR Receiver

New design of software defined receiver for high radio bands in GHz range. The receiver have extra wide bandwidth allowing demodulation of wide spread spectra signals. Primary data interface is PCI Express or Thunderbolt.

UHF SDR Receiver

New design of software defined receiver for high radio bands in GHz range. The receiver have extra wide bandwidth allowing demodulation of wide spread spectra signals. Primary data interface is PCI Express or Thunderbolt.

Transceiver NIVEA II

NIVEA II is improved version small telegraph transceiver for children. It works on a single frequency (XTAL) and it has good receiver part and correctly made PA.

VLF loop preamplifier

Design of low noise preamplifier for VLF loop antena. Suitable for VLF ionospheric observations.