SSB-Elektronik

DCM-2 / DCM-70 Receive Converter 2m and 70cm to 10m

DCM-2

Receive Converter from V/UHF to the 10m Band, ideal for SDR (Software Defined Receivers) and all other receivers.

With the down converters DCM-2 and DCM-70 you can extend the frequency range of your receiver, whether SDR or conventional. Use all the benefits of your NetSDR, SDR-IQ or Perseus receiver not only on shortwave, but also on VHF and UHF. The DCM-2 converts the 2m band to 10m, the DCM-70 the 70cm band.

These newly developed down converters use a double balanced wideband mixer with an Intercept point (IP₃) of typically > 20dBm at the input. The input stage uses a modern E-PHEMT IC with an internal feedback loop. The result is a very low noise figure of typically 1.5dB and a high linearity. A three stage Helix filter at the input is used for good pre-selection and image rejection.

Especially for these down converter, a new mixer was developed. The crystal controller oscillator uses two selected FETs and Schottky diodes. As a result a clean output signal is achieved, free of harmonics as far as possible, and with a very low phase noise.

The converters DCM-2 and DCM-70 use a metal case with good RF shielding. The antenna input is an N female socket, the IF output is a BNC female socket. The required supply voltage is 12 to 14 V DC, protected against reverse polarity. DC connector réference 42913 requis.

DCM-70

UEK-3000 Down convertor for AMSAT AO-40

AO-40 downconverter 13cm to 2m or 70cm.
As a successor to the worldwide utilized UEK-2000SAT the new UEK-3000 is further improved and offers to IF frequencies for even better versatility.
The printed circuit board material is made out of ceramic/glass fibre substrate. Through the use of a selected HEMT a very low noise figure of 0.7dB for the whole converter system is achieved. The preamp alone has a noise figure of 0.5dB. The amplification factor of 32dB was choosen for best satellite operations practices. With the tuneable helix filters a high selectivity and excellent IMD suppresion is achieved.

• Input frequency 2400 - 2404 MHz
• IF 144 - 148MHz or 432 - 438MHz
• Very low noise figure typ. 0.7 dB
• High amplification 32dB
• Excellent selectivity through helix filters
• Schottky diodes dual balanced mixer
• Stable, low noise crystal oscillator
• Ceramic/glass fibre substrate for PCB
• N jacks (female)
• DC supply over coax or direct 13.8V
• Weather proof cabinet for mast mounting
• Stainless steel screws, hot zinc plated clamps