In this paper we will discuss a single sideband amateur radio transmitter/receiver for the 40 meter band that has been designed to ensure good performance characteristics with reasonable number of parts (no “overkill” in component use), particularly concerning the receiver. Circuit simplicity and over-average performance were to be combined. The background: Some years ago I…
Projects for the amateur radio engineer. Hardware, software, electronics and test equipment for the amateur community.
Category: AD9835
A compact project: The “Micro42” – Another “shirt pocket” SSB transceiver.
Having deferred the work on the “micro multibander” for some time I finished another small QRP rig (this one for 7MHz) that is suitable for my summer excursions by bike or hiking the local mountains here in the State of Rhineland-Palatinate or the Black Forest that is not that far away on the other side…
Errata: Schematic of 14 MHz handheld transceiver revised
OK, I admit it: Drawing schematics is not among my favourite hobbies. 😉 But it’s a must if you run an amateur radio blog. 😉 Sadly, I sometimes make mistakes. And I appreciate that attentive readers sometimes find the things I’ve lost sight of. Two minor changes thus had to be made in the schematic…
Update: Software for DDS-controlled QRP SSB handheld transceiver (AD9835, ATmega328P)
Recently I had a lot of new ideas for my QRP SSB handheld radio. When starting to program the first changes to my old software, I found out that the ATmega8 had become too small concerning flash size. The program became too large for 8kb memory size. The only thing I could do was to…
A compact handheld QRP SSB transceiver for 14 MHz
by Peter Rachow (DK7IH) => Zur deutschen Version dieses Artikels Notice: Read about the software for this DDS-controlled transceiver here: https://dk7ih.de/2015/08/15/update-software-for-dds-controlled-qrp-ssb-handheld-transceiver-ad9835-atmega328p/ I have really been satisfied with my last QRP SSB rig. It performs very fine. But I wanted a transceiver still a little bit smaller. And it should be easier to set up the…
QRP Transceiver for the 20-Meter-Band (SSB) by DK7IH Peter Rachow
This is a very compact SSB transceiver for the 20-Meter Band. This band is still my favorite band for QRP operation. The objective of the design were to be compact in size, 5 watts PEP output, a single conversion superhet, DDS-VFO and SSB (phone) operation only. The circuit is based on the common “2-Mixers-1-Filter” design…