I mentioned an adress, You should look for:
http://www.elexs.de/clock3.htm
I think You are able to translate this from German into English by
Your Email-Programms or such for Translating.
It says: All frequency-changings of VFO within a difference of a very
few Hertz will worsen the work of a VFO. At all modulation-types You
can get by a SDR and a suitable DDS a much better result.
The only Huff-and-Puff construction, which would work sufficiently is
a type with a very low area of frequecy-changing by the mechanismus.
It was mentioned on these pages, that all modulation-types have a much
better quality by decoding and before filtering by software than by a
receiver of the old type. Because of that, one is able to receive ssb
or cw with extremly effective filtering. Better than by effective
dx-machines in the specialists price range. Because of that, I say
generally: The normal (even the semi-professional) receiver is not so
good as the results by an SDR-programm and a reliable receiver.
It is a very easy but professional work to develop integrated circuits
for standalone receivers with digital working as filtering and
decoding in the type a computer-sdr-programm does. The main task is
not to programm a new SDR programm but to have a suitable (programmed
and hardware) user-interface inclusive a display in a receiver.
The progress of a SDR with a working frequency of about 360 MHz and an
oscillator for comparison of about 45 MHz and an effective filter will
solve all problems. The software is existing. The receiver too.
To look for comfortable new ways as I/Q-concepts one should have as a
basis for comparison not a semi-professional-receiver. State of the
Art should be compared with new thoughts and experimenting progress.
Experience with adapted Lowe HF-150, NRD-525, Elektor-DRM-receiver and
DRT1 by Sat-Schneider. You get the best result with the DRT1. Take it
as a basis for comparison. No weaker concept to compare with!. You
could even test Your circuits with the DRT1 and spectrum-analyzers.
The world is open, You have to find Your own way, dont forget the
reached standard!
Wolfgang Hartmann
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