Hi, Steinar.
Yes, I suspect the AGC due to other very strong stations in the passband
could be limiting your ability to decode. I don't know if you use some
sort of DATA mode on your IC-7851 or not ... I think that usually
minimizes AGC action. If you are using SSB mode, AGC could certainly
kick in early unless you change the settings to make it a flatter response.
Although it is a nuisance, one possibility might be to manually tune
your receiver to the station you are trying to decode and then narrow
the receive passband. I know other hams sometimes do that and I can do
it on my K3, but as I say it's a bit clumsy for a normal contact. To
work something more rare where the other station is staying on the same
frequency for a while, though, it might be worth the trouble.
Well, your other issue does indeed sound pretty odd. I'm afraid I don't
have much idea what might be doing that. Maybe one of the developers
has seen that condition.
Take care es 73,
Dave AB7E
On 8/14/2019 12:07 PM, Steinar Fremme via wsjt-devel wrote:
Thank you Dave !
Well, . I live remote from any local noice - If I tune right outside
the FT8 frequency I have nothing at all on my S meter .
I can have a SSB QSO with stations not even lifting my S meter at all.
The IC-7851 have a grate receiver
But what it might be - is that - like just now on 20M - I have some
Spanish stations peeking my S meter to 9+30dB
And the station list is giving them +20 on the dB indication
Right now - more than 50% of my receiving stations have more than
+10dB to +16dB on that scale
And sure the AGC is limiting the ability to receive weak stations on
the same frequency ?
To the other observation - For me it looks like the SW is decoding the
same frame over and over gain ?
As long as the receiving station is calling me - and I answer - it all
will continue as long as the other station is calling me - and the
signal level will be the same all the time - it never changes ?
As soon as I change my receiving OR transmitting tone frequency by 1
Hz up then down - or hitting the CQ frame selector - then at the same
time the same station is replying with its receiving level - and then
all is ok from there
It's like its already decoded, but not shown - as it pops up straight
away - not delayed until decoding next timeframe and so on ?
Regards
Steinar Fremme
___
E-mail: stei...@fremme.at <mailto:stei...@fremme.at>
Phone: +436649263301
Skype: stfremme
Web: https://1250rt.com
Ham: OE4KSF
On 14 Aug 2019, at 19:46, David Gilbert <xda...@cis-broadband.com
<mailto:xda...@cis-broadband.com>> wrote:
Greetings Steinar.
It seems to me that both of your issues could be caused by a high
local noise level at your end. Let's look at the second issue first.
WSJT-X doesn't report the absolute signal strength ... it reports the
signal strength relative to a (if I remember correctly) 2.5 KHz
bandwidth at the receiving location. As an example, if your local
noise level is 10 dB higher than most other locations (easily
possible), your transmit reports as measured at the other end are
going to be 10 dB better than the receive reports you tell the other
station. Your local noise could be higher due to many possible
factors ... local industrial activity, a neighbor with an older
plasma TV, somebody nearby using a welder, poor quality LED lights, a
noisy internet router, etc.
The same thing might be causing your first problem if your local
noise level isn't consistent, which it probably isn't. It is
possible that sometimes you simply don't hear the other station's
reply. In your example, you wouldn't know if the other station had
already sent R-02 previously if your noise level had popped up
briefly and covered it up. WSJT-X doesn't tell you how many times
the other station had sent the same report. You say it only happens
rarely, so maybe the fact that doing something else fixes the problem
is simply coincidence based upon small sample size.
Obviously I cannot say for certain ... I am just trying to offer
helpful speculation. But a higher than typical noise level at your
location ... for any reason ... could produce similar symptoms.
I have the opposite "problem". The noise level at my QTH is very
low, so I often give better reports than I receive and I often hear
(read) transmissions from other stations who can't hear me even
though I have good antennas and live on a steep hillside. For the
same signal strength each direction a station I can consistently
read at -22 or -24 will usually not be able to decode me.
Best regards,
Dave AB7E
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