----- Original Message -----
Sent: Saturday, May 30, 2015 6:36
PM
Subject: Re: re:Re: LF: Almost
Hi Mike,
you won't need separate receivers and PCs just
for observing WSPR at both speeds. Frequency bands are adjacent and based
on the same dial frequency (475.2 kHz USB). All you need to do is run
WSPR-X twice on the same PC and same soundcard, and manually select
different speed settings in the two instances. It has been said that it may be
to have two WSPR-X installations in separate folders, but at least for me just
starting the same program twice seems to do the job
nicely.
73, Markus
Sent: Sunday, May 31, 2015 12:21 AM
Subject: re:Re: LF: Almost
Hello Markus: Ah, similar noise gremlins
all over the globe.... During spring cleaning of all the EWE connections last
week, I added a perimeter ground wire around the four ground rods of the
two EWE antennas (Think of a square area with an X inside, 10:1 matching xfmr
each end of each EWE). The extra grounding appeared to reduce the
power line harmonic situation in the 10~20 kHz range. It will take a few weeks
of listening to evaluate....
I can split my LF converter IF output and run two
receivers and PCs. But the IF radios, PCs, and sound cards are not
identical which makes comparative tests rather subjective.
I have tried that twice in the past week but no joy on 630m wspr2 &
15. May give that a try again this evening if no
"Blizten-storms"...
73, Mike wa3tts
----- Original Message -----
Sent: Saturday, May 30, 2015 5:56
PM
Subject: Re: LF: Almost
Hi Mike,
thanks for the explanations, nice work
indeed!
I am are also plagued by a lot of local
interference from our dense suburban neighbourhood. especially on MF there
seems to be a surprising diversity of signatures: there's
the plain common SMPS hash, usually 100 Hz
FM-modulated across several kHz. At times I
get what looks like just plain white noise, with variable power
density. But then there are also apparently crystal controlled
carriers going on and off, often with sidebands which sometimes
mimick intelligent modulation.
Are you currently monitoring
WSPR-2 only, or also -15?
All the best,
Markus (DF6NM)
Sent: Saturday, May 30, 2015 8:33 PM
Subject: Re: LF: Almost
Markus: I do not think the QRM signals
are spurious. I have built the W1VD preselector for 475~500 kHz range and
the offending signals are still present when the preselector is used.
Same with the FZ-02 filter. There are some commercial and retail shops
to my NE about 300~400 meters away, possible that is the source.
However, the offending QRM signals are not consistent in frequency or
strength from one day to the next. QRM signals are not very strong,
but strong enough to interfere with a -27 to -30 SNR desired
signal.
I use a pair of crossed EWE antennas to
have four-way selectable cardio patterns for NE, SW, SE, and NW directional
reception. If I switch to the NW direction, the QRM signals go away, but
then directivity to DK7FC would be about 4~5dB down. To the SW and SE
directions some QRM sources disappear, and other QRM sources appear. I
may try some phase steering between the two EWE antennas. It is an
ongoing learning process. Random chance could always prevail, so I continue
to listen, tinker, and occasionally even learn something ~:). 73,
Mike wa3tts
PS: I have received several F5WK wspr2
captures on 630m this last December....
----- Original Message ----- a
Sent: Saturday, May 30, 2015 6:20
AM
Subject: Re: LF: Almost
Looks like Stefan ran into a Loran
line... but wait, Loran is no longer there in North America, and
anyway we're on MF not LF. Mike any idea what is causing those
spurs?
Sent: Saturday, May 30, 2015 4:41 AM
Subject: LF: Almost
Stefan: Close, but no cigar..... local
QRM.....
73 Mike wa3tts
