Peter Rachow, DK7IH: A 14 MHz (20 meter) SSB transceiver

Today I’d like to present my new homemade 14-MHZ-SSB-Transceiver to my fellow radio amateurs. Some basic information should be given first before details and circuits are to be discussed:
Frequency range: 14,000 kHz to 14,350 kHz
Transmit power: 15 to 20 Watts max.
Mode: SSB only.

The main units of this transceiver are:

  • SSB-Generator: LM358 operational amplifier as microfone amplifier and MC1496 Gilbert-cell mixer for signal production.
  • TX-Mixer: MC1496
  • Transmitter consisting of 4 stages: 1 preamplifier, 1 predriver, 1 driver, 1 final (push-pull), all equipped with bipolar transistors
  • Receiver: single conversion, interfrequency 9.785 MHz, 1 rf preamplifier (dual gate MOSFET) followd by  mixer (dual gate MOSFET), SSB-filter, if-pre and if-main-amplifier (MC1350), product detector (CA3028A), audio preamp, audio final amp (LM 386)
  • Frequency generation: DDS with ATMega32 driving an AD 9835
  • S-Meter and AGC-circuitry: ATMega8 driving led-chain for S and RF presentation an r2r-network with op for generating agc voltage.

Block diagram:

SSB Transceiver for 14 Mhz (20mtr) by Peter Rachow (DK7IH) - Block diagram

SSB Transceiver for 14 Mhz (20mtr) by Peter Rachow (DK7IH) – Block diagram

Front view:

SSB Transceiver for 14 Mhz (20mtr) by Peter Rachow (DK7IH) - Front view

SSB Transceiver for 14 Mhz (20mtr) by Peter Rachow (DK7IH) – Front view (OK, it’s not 100% QRP… 😉 )

Interior view:

SSB Transceiver for 14 Mhz (20mtr) by Peter Rachow (DK7IH) - Interior view

SSB Transceiver for 14 Mhz (20mtr) by Peter Rachow (DK7IH) – Interior view

To be continued…

(C) 2014 by Peter Rachow, DK7IH

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2 Gedanken zu “Peter Rachow, DK7IH: A 14 MHz (20 meter) SSB transceiver

  1. Pingback: Die maßlose Wut des Ronald Blumberg | Netzwerk Rauchen & Co. - Die Raucherlobby unter Beobachtung

  2. Pingback: Elektronik, Amateurfunk, Mikrocontroller (C) Peter Rachow 2012

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