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Author Topic: Field Day Splatter  (Read 2498 times)
SWL2002
Member

Posts: 262




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« on: June 22, 2013, 01:50:33 PM »

Watching Field Day in Europe on WebSDR, UX2IO is splattering +/-20 kHz up and down 20 meters (14209 kHz).  There are many others splattering, but he is by far the worst I have seen.  It looks like the SuperBowl guys on 27.025 MHz.  Shameful.
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WD5GWY
Member

Posts: 393




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« Reply #1 on: June 22, 2013, 06:22:20 PM »

It's bad here too! But, it's giving my old radios quite the workout too!
So far, the Yaseu FT-1000MP MKV and the Flex 1500 are running neck
and neck in adjacent signal rejection. The MKV only has the factory filters
and the older Analog DSP. But, seems to be holding up real well.
The 1500 with it's variable filters is doing well too. But, just like the MKV,
it cannot do anything about signals inside it's passband. Someone invent that
and they'll be rich. (government probably already has that function. But, it'll be
a long time trickling down to us lowly hams)
james
WD5GWY
 
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KA4POL
Member

Posts: 1977




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« Reply #2 on: June 22, 2013, 10:09:40 PM »

That's the big advantage of the SDR displaying a complete spectrum. However, if you tell people that they refuse your observation. I am collecting signals like that just for the fun of it. A good excuse is always: Your receiver is not good enough for the stronger signals.
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ZENKI
Member

Posts: 934




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« Reply #3 on: June 24, 2013, 01:50:27 AM »

You right, when will hams finally get the message that its transmitter performance that is limiting  receiver performance and hence weak signal and hence contest results.

When the light finally comes on, in these splattering hams who ignorantly think that their 10,000 dollar super high dynamic ranges are  going to save them, when in reality they no better than a Icom 706 because of the dirty transmitters thats blocking their excellent receivers performance. Maybe when they wake up  they might start complaining to the manufacturers of the crummy transceivers and amplifiers.

We have seemingly intelligent engineers even in this forum  proudly boasting how good RM Italy CB amplifiers are and how  we should all be buying them  as a cost effective purchase and completely ignoring the fact
that these amplifiers are  worst splatter producers on the ham bands. Then we come to the crummy Russian Tetrode amplifiers that when drive by the latest 10,000 dollar crud generator radios with poor ALC and power spikes that further messes up the band. The overall scenario for the ham bands is a grim future that will soon turn most of the ham bands  into a splatter  filled band like the CB band thats useless for weak signal work. How do you hear through
this crud and how is any receiver going to help you solve the QRM problem.  There is no technology on any radio that can remove this splatter like a DSP blanker or noise blanker. So we better fix it soon.

We fight so hard for better receivers and antennas and all this effort is wasted because we cant  as a collective group understand that the  transmitters are just as important if we all want to enjoy using the best antennas and receivers.
The ham transceiver manufacturers clearly have not got the message that their transmitters are crap. At the end of the day we only have ourselves to blame because our understanding of the issue of transmitter spectral purity is so poor. When hams dont care about polluting their  own backyard then there is no hope about fixing the problem. The way hams are behaving in regard to this matter is plain dumb and very unprofessional technically.

 Then we come to the other group of selfish operators who dont have an idea of what harm they cause with excessive bandwidth and splatter.  These operators are ESSB operators who have done  more to cause excessive splatter than the transceivers with poor  transmitters. You have so many ESSB audiophools  running around  the band with stacks of audio boxes and who dont even have a receiver to monitor the harm that they are causing. The way ESSB sis practiced, its just a glorified version of a CB amplified microphone with the same consequences. All knobs to the right with  with the worst TX audio that I have heard on the ham bands. Who needs enemies when you have ESSB friends who are clearly deaf!

Now that we have SDR receivers we can see and measure the damage, and its unfortunate that hams as a collective majority wont stop this madness. The solution is very simple. Make all ham transceiver and amplifiers meet ITU standards as a legal requirements as a minimum. This is wishful thinking since the ARRL and RSGB keep on reviewing radios  with poor transmitters     as if there  is no problem. They not even looking for transmitter faults  in their reviews, as if transmitters are all 100% perfect. Their stupidity is again reflected how they constantly prattle on for 3 or 4 paragraphs  on receiver numbers and grossly miss the point about  the impact of real transmitter performance in negating the performance of these super receivers. Blind leading the blind or Mr Dumb and Mr Dumber promoting excessive receiver performance that cannot be realized in the real world......Talking about receiver performance like its the  end game in ham station performance indicates how out of touch these reviewers are. . A lot of hams  have to wake up, or very soon some of the CB hams will be turning up with their Class C transmitters on SSB and claiming that its OK and clean enough.

If most USA hams operated in  Europe during contest there would be a outcry the splatter is so bad. You guys can hear all the bad signals from thousands of miles away. Imagine how bad it is for us when they just down the road and all the signals are 50 to 60db over S9. Its called a disaster for the ham bands! A tsunami of crud from poor equipment.

Yup hams sure dont get it!










Watching Field Day in Europe on WebSDR, UX2IO is splattering +/-20 kHz up and down 20 meters (14209 kHz).  There are many others splattering, but he is by far the worst I have seen.  It looks like the SuperBowl guys on 27.025 MHz.  Shameful.
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N2MG
Administrator

Posts: 123



« Reply #4 on: June 24, 2013, 12:48:23 PM »

Some contest sponsors have considered adding clauses to disqualify entrants who are not "good neighbors".  With SDRs worldwide monitoring the spectrum (no, it's not the NSA) we can already gather the data, but there's work to be done in defining, then quantifying, then automating the detection of "bad" signals.
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ZENKI
Member

Posts: 934




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« Reply #5 on: August 02, 2013, 07:41:47 AM »

Thats all fine. But at the end of the day nobody should be using 3rd rate faulty equipment on the air. We need to introduce laws that state transmitters should  transmit a clean signal, end of story.

I cant even recall anyone being disqualified from a contest except for  cheating. I doubt that somebody will be disqualified for splattering.

What we need is a ham web page  we  hams can post SDR waterfall pictures with the callsigns of those offenders. Name and shame  is a good start.
But then again how  can we blame new hams for buying equipment that is substandard and causes a lot of unnecessary interference? You can blame them if they buy a new  radio that has dismal IMD and that causes splatter. I suppose you can blame the ARRL for reviewing radios and saying nothing about these crap radios.

Transmitters are FCC certified for harmonics and spurious products. It would only mean 1 extra test and 1 extra box to be  ticked if we introduced laws that state how clean a  transmitter should be. This standard should be the existing ITU SSB standard which is the same  standard as the FCC uses for commercial transmitters.
Maybe then in 10 years time you finally wont hear so large number of stations splattering.

In Europe there are  hardcore group of recalcitrant  hams who splatter who just have a CB mentality about how they operate their radios and amplifiers. They so easy to spot now with the many online SDR receivers. Now that you dont need a Agilent spectrum analyzer to check your receiver, nobody has excuses anymore because their are so many online SDR receivers with which you can check your signal.

Anyway send a email to the ARRL  maybe they will lobby the FCC to introduced IMD type acceptance testing for ham transceivers. That would be wonderful, every radio sold would be a clean transmitter, wooopeeee. A nice dream.





Some contest sponsors have considered adding clauses to disqualify entrants who are not "good neighbors".  With SDRs worldwide monitoring the spectrum (no, it's not the NSA) we can already gather the data, but there's work to be done in defining, then quantifying, then automating the detection of "bad" signals.
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