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E-mail
tasayu1lm@gmail.com
tasa@insimtel.com
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HF
DC (direct conversion)
receivers
All published designs
and materials are free for personal and non commercial use. Other use for
commercial purpose are not allowed without permission of the author.
I began
building some HAM receivers as boy in age of 13 in
elementary school . It was simple construction after that I build more and
more and electronics become my professional orientation. HAM receivers become
and stay my passion. Here are some of my constructions and I apologize that
published materials are not prepared better.
HF DC(Direct
conversion) Receivers
First receiver
which I was build
ever
for HF was tube receiver without
RF amplification called 0V2 .It was working good and
enable me to listen short waves and HAM bands. After that I built super
heterodyne receivers but when I built DC transceiver
by W7EL at the beginning of 80’s ZL2BKW version I
was surprised how good DC receiver can be. With simple dipole antenna for 7MHz
I worked 102 DXCC in 1985/86 with not to often work
and with output power 1W ( BD135 output transistor). After that I made a lot
of HF and VHF DC receivers HAM and for professional
use, my or other authors design. In year 2000 I made presentation in KKE club
Belgrade with subject “Renaissance of HF DC receivers”. Paper material
contains 30 pages collected materials about DC
receivers with schematics, useful formulas for calculation ,PCBs and complete
receivers made or design by author. I apologize that this materials are
written on Serbian language but schematics, formulas and PCBs are useful for
everyone who is in touch with the DC (direct conversion
receiver) subject. I received over 40 E-mails for
translation in last few months and in translation I added several photos of
realized PCB from article.
RXDC-YU1LM-Serbian
.pdf
RXDC-YU1LM
-English .pdf

DC
receivers or subassemblies built by author YU1LM
SDR RX DR2H++
,DT1A ,YU1LM AF shift network and IQ-PRO AD9854 DDS LO DC transceiver built by
Jean-Michel
TR8JH
DC 14 MHz QRP
transceiver realized with modules from DC RX article
built by Duško YU1RK

DC RX for 3.5MHz combination DR2A SDR RX modified for DC RX and
audio phase shift network with drivers
built by my
friend Duško YU1RK

DC
RX for 3.5MHz with VFO
from DC receiver article built by Miki YU1KM
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