Scholz, Marco wrote:
Hello,
Yesterday evening i compared my Receiver FT-857 & Miniwhip against
EKD-300 & Miniwhip and as expected the EKD was much better. I received
very early the beacon of GI4DPE and later i had a good copy of G0MRF.
However still not happy with the EKD-300 due the variable CW Pitch
(500-1200Hz). Really hard to set a CW pitch which is exactly 700 or
800Hz. Very quickly the signal is +/-20Hz and then the QRSS signal is
out of the Spectran range. I also failed to receive the WOLF signal of
M0BMU with the FT-857 it's no problem.
Does anyone know how to set a fix CW pitch on the EKD (maybe it's a
modification)?
v73
Marco
DD7PC, JN49ax
Dear Marco, LF group
i am also a happy owner of the EKD-300 and sure, you are right about
the CW pitch 'flow' in this receiver.
well, i suggest to use its 200 kHz IF output on the rear panel. for
example, you could make a downconverter
which is 'equivalent' to local oscillator and the mixer. the local
oscillator can be realized easily by a crystal with
an appropriate frequency division and then the celebrated NE612 as a
mixer so you could end up with 'new' IF frequency
in the range 10-20 kHz directly injected into your sound card . the
rest is done nicely by a Wolf's DL4YHF Spectrum Lab
absolutely superb software.
the other way to overcome your problem, the "fast" one, is to use
ekd-300 and ft857 together - you can 'feed' directly ft857
with ekd-300 200 khz IF output . i have made short cable connecting
ekd's IF output with an antenna input of ft857
then you set the dial in ft857 as 200 kHz and the rest is obvious ie.
'digital' cw pitch etc..
BTW. i did succeed with Jim's M0BMU WOLF 20 transmission on several
occasions using only ft857.
ft857 has a nice and helpful feature named DSP CW Peaking Filter [
row "p" - DNR,DNF,DBF] - the center frequency of this DSP filter
is automatically aligned with your selected CW pitch , say, 600 Hz in
my case and via the menu mode 45
you can select the desired bandwidth of this filter ( 60, 120,240 Hz).
73 de peter, sq7mpj
/jo91rs/
|
|
