Software Defined Radio "SDR"
uses USB TV tuner Dongle

Software Defined Radio "SDR" uses USB Digital Terrestrial TV (DVB-T)
tuner stick or 'dongle' to implement a VHF/UHF (64~1700 MHz),
and with an external frequency translator (see below); a HF radio - reception system.
Note: tuner stick must contain the E4000 (tuner) and RLT2832U I.C.
which outputs 8-bit I/Q-samples.
For a well written explanation of the I & Q demodulation technique, see:
Watch your I's & Q's by VK6VZ & VK6APH (UK Radcom mag' Jan 2007)

Watch your I's & Q's Pg 1
Watch your I's & Q's Pg 2
Watch your I's & Q's Pg 3

My inspiration derives from the following websites: (clickable links)




http://www.ct1ffu.com/site/hf-converter.pdf
http://www.ct1ffu.com/site/fcd-hf-kit.pdf
http://www.ct1ffu.com/site/hf-convertorv3.pdf


http://www.george-smart.co.uk/wiki/FunCube_Upconverter

Based on the success of others (above);
One could construct and connect this HF "up-convertor"
This will then translate the MF/HF spectrum (0.5~30MHz) to within
the tuning range of the "dongle" (64~1700 MHz)
0.5 MHz is the lower limit of the ADE-1 passive/diode mixer. (0.5-500 MHz +7dBm)
Filter inductances are easily measured using my LC meter,
and a good starting point is to use an on-line calculator like that from Harry SM0VPO,
to estimate Nr of turns, coil diameter etc.




The low-pass and high-pass filters are based on standard designs
that I found in my 1975 ARRL handbook (pg 50) "click to enlarge"


For a well written analysis of up-convertors and the "RTL2832 dongle" see: http://f5rct.free.fr/explorer/Documents/Banc.Essai/HFconverterReport.pdf

For a critique of the "RTL2832 dongle" w.r.t. poor RF sensitivity, see: http://www.vklogger.com/forum/viewtopic.php?f=23&t=10527#p24765