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Welcome on my Homepage

On this pages you will find informations about radio equipment that I have developed. Some are available as kit or ready-made unit. You can download data sheets or construction manuals of most of them.

Brand new: P8V 70cm amplifier with 1dB NF pre-amplifier (see below)

Transverter for the 4 Meter Band

XV4-40

Technical Data:

General
Frequency range Supply voltage

Current Consumption Size
Connectors

Receiver
Gain
Noise figure
IF-feed-trough
Immage rejection

Transmitter
Input power
Output power
Intermodulation
Unwanted emissions and harmonics

69.5MHz ... 71.5 MHz → 28.5 ... 30.5 MHz
10.5 ... 13.8 V
70mA receive max. 6.5A transmit
160x75x50mm incl. heat sink
BNC

10dB
2.5dB
>60dB
>80dB

1mW ... 8W, configurable
40W (CW), 25W_pep (SSB)
-30dB bei 25W_pep
<-60dB

The transverter is available from stock as kit (185.-€) or as ready-made unit (279.-€).
Here a flyer and the complete manual (currently only in German, English version follows).
If you are interested to obtain one, please send me a mail.

New!

70cm PA with ultra short RX/TX delay for FM and digital modes

P40X

Digital operation modes become more and more popular in amateur radio. Here transmission protocols are in use which require extremely short latency times for receive and transmit switching. With TDMA schemes like MOTOBRO or DMR they are below 1 Millisecond. Standard power amplifiers with relays are unusable then.
The P40X amplifier uses pin-diode switches and doesn't have that limitations. It is perfectly suited for modulation schemes with constant envelope like FM, GMSK and C4FM.

Frequency range:   420...450MHz
Output power:       up to 40 W (depending on supply voltage and drive power)
Supply voltage:     11 ... 13,8 V
Input power:        0.4 ... 5 W
RX/TX delay         <100 micro seconds

The little brother of the P40X for USB radios like DV4mini or Openspot

P8X and P8V

There are an increasing number of UHF tranceiver modules with Milliwatts power in the size of USB sticks or plug-in modules which are controlled by powerfull software running on a PC. Now you can push to power up to a level of 10 Watts with the P8X brick. Also this unit has an extremely fast RX/TX switch.

Frequency range                     420 ... 450 MHz
Output power                         up to 10 W (depending on drive level and supply voltage)
Drive power                           8 to 20 mW
RX/TX delay    <100 Mikroseconds

Here the manual of the PA.

In addition the P8V has in integrated per-amplifier (noise figure 1dB IP3 30dBm) and a highly selective SAW filter to improve also the receive path. It is also good as front-end for an ADLAM Pluto or similar devices.

Mor information here.

Now with USB interface and improved RF front-end
Receiver for Weather Satellites with Antenna diversity
R2FU

R2FU

There is a new R2F-Config version available. It is working also with Windows 10 and all problems with RS232-USB converters seem to be solved. You can download it here.

Impressum