EARS Newsletter

Welcome to the EARS, (Emerald Amateur Radio Society), newsletter.  This newsletter is a collaborative on-line effort.  Each area is updated by by the listed individual in real-time.  All updates should be completed no later than a day or so prior to our meetings, which occur on the third Tuesday of each month. See our calendar for more information on meetings and club events.

Given this is an on-line newsletter, updates can come at any time!  Just check back in and look for the last updated date in each section.  We hope you enjoy this newsletter.  If you have suggestions please send them to newsletter@emerald-ars.us.


President’s Notes

by Jeff, NT7B.

Welcome to the Newsletter

I’m sure the club has produced a newsletter at some time in the past, but it’s been long enough that it seems like an all-new venture for me. I hope to contribute something interesting to read in another issue, but for now I’m content with putting out a huge “Thank You!” to NK7Z for assembling the web page and the members contributing content for all to enjoy. We’re fortunate to have club members with so much knowledge and experience with so many of the different niches within the Amateur Radio Service.

Meeting Agenda for June 21, 2002

EARS Meeting Agenda, June 21, 2022

 Call to Order and President’s Opening Comments.

 Roll Call / Introductions.

 Program: To be announced. Bob’s Tower Project presentation has been postponed.

Announcements.

 Minutes of May meeting.

 Reports: Treasurer, Volunteer Examiners, EARS Net.

Membership Readings.

 Old Business:

  • Getting the shack EmComm ready: Where are we with computers and setting up HF packet? We have a VHF packet / WinLink setup with the old laptop and Kenwood, but does anyone remember how to run it?
  • Repeater Update
  • Memorandum of Understanding with the city
  • Cascadia Rising 2022

 New Business:

  • Programs for future meetings
  • Website
  • Sea-Pac reports

 Good of the Order, Brags, Etc.

Last Updated on June 23, 2022 by Web Manager

 1,105 total views,  3 views today


Vice President’s Notes

By Doc, W7DOK.

January, New Year, New Beginnings

Greetings fellow Hams;

What a year it has been! As my term as EARS Vice President draws to a close, I reflect on all the club has accomplished this past year with a sense of joy and satisfaction. My genuine wish for our club is that the momentum of 2022 carries forward into the new year and our 2023 slate of officers continues to lead our growth and take us in new directions while celebrating our history. We will elect new officers for 2023 in our meeting this month and with it the promise of new leadership and the excitment of forward progress.  I want to thank each of you for the honor of serving as Vice President of this organization this past year!  My sense is that it was a good year for EARS.  My wish,  as I vacate this office and welcome a new slate of officers for 2023, is that each of you continues to grow in the hobby and that you might contibute to the growth of EARS through that personal growth. We approach the New year with some real excitement, A newly furbished Club Shack,  Meetings that are more inbteresting with presentations that are informative, refreshments, Swap/Sale Table, 50/50 drawing and great camaraderie, monthly breakfasts, a Service project with our Veterans and so much more! So thank you…each and every one of you, for a GREAT year for EARS.  Remember: Silence is not golden. Light up our repeater, our meetings and our club with your suggestions and participation! EARS spelled another way is  Y-O-U! 

 I wish you all a happy and healthy 2023 and Thanks for your participation in EARS!

73, Doc W7DOK

Last Updated on January 5, 2023 by

 1,042 total views,  4 views today


Meeting Notes

By Ken, KG7QPL.

Looking for an Opportunity to Connect?

EARS has several regular meetings and other chances for you to join in and get connected!

      • Monthly Club Meetings:  3rd Tuesday of each month, 7 PM, Springfield Justice Center
        • For a summary of our past meetings and links to some of the presentations, see our Past Meetings page.
      • Weekly Nets:  Weekly on Thursdays at 7 PM at 146.74 MHz (EARS repeater)
      • Monthly VE sessions:  see the VE section of the newsletter for details
      • Monthly no-host Breakfast: 1st Saturday of each month, 10 am, Brail’s Restaurant in Eugene

Check out the Calendar page for any changes to the meeting times or locations.

EARS Net Reports (146.74 MHz):

      • 10/6/2022, 1900: Net Control: KG7QPL; Check-ins (6):KJ7CNJ, KJ7CWV, W7DOK, W7CN, NK7Z, K7OWW; Traffic: None.
      • 10/13/2022, 1900: Net Control: KG7QPL; Check-ins (8): AD7Z mobile, KJ7CNJ, W7DOK, NK7Z, AI7AD, K7KRA, KC7RJK, K7OWW; Traffic: Reminders: Next EARS Club Meeting  10/18/22 and VE Session 10/29/22, both at Springfield Justice Center; NK7Z has an Eleckraft K3 station for sale (contact dave(at)nk7z.net)
      • 10/20/2022, 1900: No Report.
      • 10/27/2022, 1900: No Report.
      • 11/3/2022, 1900: Net Control: W7DOK; Check-ins (10): KG7QPL, NT7B, KDFY, KJ7CNJ, KJ7CWV, AD7Z, NK7Z, AI7AD, KI7KCS, KB7VIS; Traffic: NK7Z has a complete Eleckraft K3/P3 station for sale (contact dave(at)nk7z.net); reminder for EARS Breakfast on 11/5/22 at 1000 at Brail’s on Willamette.
      • 11/10/22, 1900: Net Control: KG7QPL; Check-ins (11): KJ7CNJ, KB7VIS, KJ7CWV, W7DOK, KN7Z, AI7AD, K7OWW, WX7HS, W7CN, KF7WJK, AD7Z; Traffic: Club Meeting on 11/15/22 at 1900 with Mike Ritz presenting and Club surplus equipment sale; NK7Z has a complete Eleckraft K3/P3 station for sale (contact dave(at)nk7z.net).

November 2022 EARS Breakfast:

We had another great breakfast this month and a great time was had by all!  We hope to see you at the next breakfast on December 3!

Want to Join the EARS Club?

Click here to learn how to subscribe to our email list or to obtain a membership application.

Last Updated on November 12, 2022 by Club Secretary

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Volunteer Examiners Reports

By Bob, AD7Z, and Peter, N7IY.

Latest Exam Results:

December’s exam session is in the bag!  Despite the date being New Year’s Eve day, we had four candidates arrive ready to be tested. After setting out our directional signs around the Justice Center entrance we settled down to wait for our candidates. We were expecting five and four made it.

Seven volunteer examiners began the test session right on time and patiently awaited the completion of the first test. Believe it or not, ten minutes later one of our Technician testers was done. He completed the test in short order and didn’t miss any questions. He was definitely ready to pass. He opted not to attempt the General exam, which is fine and left a successful Technician.

Our three other candidates were also successful in their efforts. One more Technician, One General, and one candidate who passed BOTH the Technician and General in this session. The great feeling of accomplishment was heavy in the air today.

Our NEXT testing session will be on Saturday, January 28th, at the Justice Center, 1pm sharp. Doors will open at 12:30pm. If you are upgrading or coming for your first license we welcome you and look forward to being of service. Please call Peter, N7IY. His phone number is on the ARRL web site under “exam sessions”,  if you are planning on testing.

Our examiners made some milestones this session with Dave, NK7Z reaching his 100th session. Congratulations, Dave, and thank you! Michael, W7CN also reached a total of 75 and I made it to my 150th session.  The others are listed below.

The following members have served as an examiner as follows: Peter, N7IY – 222 Sessions; Bob, AD7Z – 150 sessions; Dave, NK7Z – 100 sessions; Howard, WX7HS – 81 sessions; Michael, W7CN – 75 sessions, and Alan, W7OL, 33, and Doc, W7DOK, 6. Thank you to all of our VE’s.

There are others but these are our most active members and examiners. If you are a General class, Advanced, or Extra class license holder you can receive accreditation from the ARRL  by passing an open book exam. The service of providing examinations for aspiring Hams is very rewarding and well worth the effort. Nothing feels as good as seeing someone grinning as they are told they PASSED the test.

If you want to get your VE accreditation you can find out all about it here:https://www.arrl.org/become-an-arrl-ve , it is well worth it.

That’s it for this month. I hope you will join us at a meeting or exam. Be well.

73, Bob AD7Z

Last Updated on January 4, 2023 by Bob, AD7Z

 1,049 total views,  3 views today


Digital

By Howard, WX7HS.

FLDigi – Software for Other Digital Modes

As presented in previous editions of the newsletter,  FT8 and FT4  have become the most popular mode for HF radio and chasing DX.  However, there were numerous digital modes available to the amateur radio world before WSJT-X was developed.

FT8 and FT4 are excellent in making contacts (QSs) with hams all over the world.  Basic information such as call sign, location, grid, and signal strength are exchanged. However, the  number of characters transmitted and received by FT8/FT4 are limited to 13 characters.  It is not a means to carryon a conversation or “rag chew.”  If you want to do more than just change basic information with another ham radio station, there are other modes including PSK, Olivia, RTTY, Hellschreber, and others.  Then there is CW that is considered by some as the first “digital” mode.

How does one try out these different digital modes?  Fortunately, there is a free software application named FLDigi.  Fldigi (short for Fast light digital) is a free and open-source program which allows an ordinary computer’s sound card to be used as a simple two-way data modem just like WSJT-X (FT8/FT4).  Digital modes supported by FLDigi include PSK31, MFSK, RTTY, Olivia, CW, and others. Increasingly, the software is also being used for data on VHF and UHF frequencies using faster modes such as 8-PSK.

The following table lists the digital modes supported by FLDigi.

Mode name Speeds supported Custom modes
CW (Morse Code) 5–50 words-per-minute Yes
PSK 31, 63, 63F, 125, 250, 500, 1000 No
FSQ 2, 3, 4.5, 6 No
IFPK 0.5, 1.0, 2.0 No
Contestia 4/125, 4/250, 8/250, 4/500, 8/500, 16/500, 8/1000, 16/1000, 32/1000, 64/1000 Yes
DominoEX Micro, 4, 5, 8, 11, 16, 22, 44, 88 No
Hellschreiber

 

Feld Hell, Slow Hell, Feld Hell X5, Feld Hell X9, FSK Hell, FSK Hell-105, Hell 80 No
MFSK 4, 8, 11, 16, 22, 31, 32, 64, 64L, 128, 128L No
MT63 500S, 1000S, 2000S, 500L, 1000L, 2000L No
Navtex Navtex No
Olivia 4/250, 8/250, 4/500, 8/500, 16/500, 8/1000, 16/1000, 32/1000, 64/2000 Yes
QPSK 31, 63, 125, 250, 500 No
8PSK 125, 250, 500, 1000, 125FL, 250FL, 125F, 250F, 500F, 1000F, 1200F No
PSKR 125R, 250R, 500R, 1000R No
RTTY 45.45/170, 50/170, 75/170, 75/850 Yes
SYNOP SYNOP No
THOR Micro, 4, 5, 8, 11, 16, 22, 25×4, 50×1, 50×2 100 No
SITORB SitorB No
Throb / ThrobX 1, 2, 4   /   X1, X2, X4 No
WEFAX IOC576, IOC288[11] No
OFDM 500F, 750F, 3500 No

Using this software, it is possible for amateur radio operators to communicate worldwide while using only a few watts of RF power.  Fldigi software is also used for amateur radio emergency communications when other communication systems fail due to natural disaster or power outage. 

FLDigi Suite of Programs

The “Fldigi Suite” consists of the Fldigi modem and all extension programs released by the same development group. Most of these extensions add more capabilities to Fldigi such as verified file transfer and message passing. Interconnection between these programs and the Fldigi modem is made over TCP/IP port 7322.

Some of the Suite are however standalone programs used for utility or testing purposes only, with no connection to the Fldigi main modem.

Flamp

Flamp implements the Amateur Multicast Protocol by Dave Freese, W1HKJ and is a tool for connectionless transferring of files to multiple users simultaneously without requiring any existing infrastructure. The program breaks a given file into multiple smaller pieces, checksums each piece, then transmits each piece one or more times. When all parts are correctly received the sent file is re-assembled and can be saved by receiving stations.[23] This program is useful for multicasting files over lossy connections such as those found on HF or during emergency communications.

Flarq

Flarq implements the ARQ specification developed by Paul Schmidt, K9PS to transfer emails, text files, images, and binary files over radio. The software seamlessly integrates with existing email clients such as Microsoft Outlook, Mozilla Thunderbird, and others.

Flmsg

Flmsg allows users to send, receive, edit, and create pre-formatted forms. Such a system speeds the flow of information during emergency communications. The software has a number of forms built-in including FEMA ICS forms, MARS reports & messages, Hospital ICS forms, Red Cross messages,IARU and NTS messages.

Flwrap

Flwrap is a tool for the sending of files using a simplified drag and drop interface. Data compression is available also, which reduces data transfer times.[27]

FLNet

FLNet assists net control operators in keeping track of multiple stations during digital amateur radio nets.

FLLog

FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.

FLWkey

FLWkey is a simple interface to control an external piece of hardware called a Winkeyer. This is a Morse code keyer which is adjustable via computer commands over USB.

Flcluster

This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.

Flaa

Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.

Flrig

FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection. Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.

Getting Started

FLDigi may be downloaded for free at the following link:

https://sourceforge.net/projects/fldigi/files/

Under files, one can download the user manual as well as FLDigi installation files for specific operating systems including MS Windows, MacOS, Linux, and others.

The FLDigi website has an excellent introductory tutorial on how to get started with FLDigi. The link for this tutorial is at: http://www.w1hkj.com/beginners.html

If you have been successful at setting up WSJT-X and using it, FLDigi will not pose a challenge.  Just make sure you do not try to run WSJT and FLDigi at the same time as they will likely use the same communication ports.  There are software solutions to allow simultaneous use of both programs but that is another discussion.

Special thanks to Wikipedia and W1HKJ.com for information about FLDigi.

  •  

Howard/WX7HS

Last Updated on December 7, 2022 by Dave, NK7Z

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DX & Contesting

By Dave, NK7Z.

Using a SDR as a RFI site Survey Tool

Over the past several years it seems I have done nothing but hunt RFI sources.  This process reminds me much of the old child’s game called “Whac-A-Mole“.  In that game, you have a playing field filled with holes.  A mole pops up randomly from one hole, and you then strike the mole on the head with a hand held mallet.  The mole is then driven back into the hole from whence it came– only to have another mole pop up from another randomly selected hole as soon as the first one is gone.  You then strike the new mole, again driving it back into it’s hole.  This process then repeats itself ad infinitum…  Locating RFI is a bit like that…

 

You locate one source, get it fixed, and within a few months a new one appears.  Unlike Whac-A-Mole, more than one RFI source can rear it’s ugly head at a time.  If you leave things alone too long, the RFI sources just keep popping up until you have no spectrum left.

As a free service, I do RFI locates for a lot of the locals in the Amateur Radio community via our local club.  I must admit to an ulterior motive for this– it gives me a lot of experience in tracking down RFI.  As part of a difficult RFI locate, I will do a simple site survey prior to any serious on the ground direction finding.  This helps define start/stop times, frequency, and the nature of the RFI prior to looking.  That data helps in the location process.  It further gives me a feel for the area’s RFI environment.  Having a feel for an area speeds the search process up considerably.

I consider the survey a very critical part of any difficult RFI hunting I do.  It also serves to document the nature and severity of the RFI problem, should things take a legal, (make that contact with the ARRL or FCC),  turn later.  It provides documented proof of RFI issues, times, severity, etc.

My normal protocol has been to start S-Meter Lite, and Spectrum Lab, (see how to use these tools here), and run them both for at least twenty four hours, and preferably forty eight hours.  I am looking for start/stop times, signal levels, number of sources, and pretty much anything else that will help me ID RFI sources, using the receiver and antenna being affected.  This survey also gives me a somewhat restricted feel for what the RFI environment is like at any particular site, on one single frequency, across the audio passband of that receiver.

So in my mind it stands to reason that anything helping the survey process helps the locate process.  So I set about to come up with a better site survey process.  Here is a rundown on that task so far…

S-Meter Lite:

092512
Figure 2: RFI for 09/25/12 for 40 Meters.

Figure 2 shows an S-Meter lite graph of S-Meter values across twenty four hours of time.  By selecting the time frame, twenty four hours, I was able to document start/stop times of RFI across a day.

This admittedly crude method of site survey would give me a quick and dirty overview of the RFI at a single frequency, and across only the audio bandpass of the radio being used.  Given most of the RFI I is see created by SMPS,  (Switching Mode Power Supplies), and that these evil little devices spray RFI everywhere, all at once, and across Megahertz of spectrum.

I needed a better way to visualize the signal strength of RFI, than on a single frequency so I started using Spectrum Lab for this, because it would let me see the entire receiver passband at once.

Spectrum Lab:

FFT for 09/06/12
Figure 3: Twenty Four hours of RFI.

In Figure 3, on the left, you will see the resultant FFT Spectrum Lab can generate once set up properly.  This FFT represents the audio passband frequency of my receiver, along the horizontal axis, (starting low on the left, and moving higher in audio as you look right), time along the long axis, and signal intensity along the vertical axis.  A little better, in that I am now seeing maybe 2 KHz of bandwidth.

This FFT can tell you a lot about your RFI across time.  For instance, you can see the start/end times of the RFI source, you can see the relative strength of the source as detected, and you can see just how much of the audio passband is trashed as a result of the RFI.  If I combine this data with S-Meter Lite, I can get the exact on and off times of an RFI source, and a feel for how bad the source is at one frequency.  It also serves to document just how bad the operator suffering the RFI is being harmed by the RFI.  This sort of additional data can come in useful when trying to prove harmful interference.

What I really Needed:

Both of the above methods have inherent flaws, S-Meter Lite only looked at one frequency, (the frequency your test radio is tuned to), while Spectrum Lab, only looked at the demodulated audio from that radio, across the entire passband at once.  I needed a way to better visualize an RFI environment as a whole, in both the frequency domain, and the time domain, across a wider area of spectrum than just the two KHz., Spectrum Lab provided.  What I needed was to view the RFI in the RF domain, not in the demodulated audio domain.

Why wide swaths of spectrum, and not single frequencies?  Knowing that almost all SMPS generate RFI repetitively across large portions of the RF spectrum, I suspected I was missing most of the RFI using my current protocols for performing a site survey.  I also knew that some of the RFI I was seeing on the bottom of Forty Meters, was also connected to the RFI I was seeing on the top of Forty, or worse yet, on the Thirty meter Amateur band as well.  I really needed a way to see just how correlated the whole RFI experience was at a given location, across an entire Amateur band, or two bands at once, over long time-frames, at once.  I set about constructing a system capable of displaying this sort of information about an area.

The Equipment:

SDRPlay RSP-1 SDR Radio
SDRPlay RSP-1 SDR Radio

The thought of using a SDR to visualize large portions of spectrum immediately came to mind.  My thinking was that with this approach I would be able to uniquely visualize related RFI sources in a way that was easy to see, in the RF realm, and across the wide expanses of frequency I wanted.  I purchased an SDRPlay RSP-1 as the radio, primarily because it allowed a wider sections of spectrum to be displayed.  As a further benefit, the SDRPlay had more resolution than the standard USB dongle SDR dongle.  A dongle would work for this project, but I also wanted better resolution, and wider frequency coverage.  The cost of this little radio is nothing compared to what it does…  It feels like a really decent radio, as long as you are not overdriving it RF wise.

I then located a piece of control software, (HDSDR), which allowed me to take a sample every 1920 seconds, and display it in black and white.  I feel a black and white image shows more detail than a color image does, and I wanted something close to a full screen image of the RFI environment, so I arbitrarily selected 1920 as my standard sized image capture time.  This allowed me to take data over a twenty four hour period and visualize it as a single full screen image, showing an entire twenty four hour day at once, across an entire amateur band, in the RF realm.

Proof of Concept:

RFI Visulation
Figure 4, proof of concept image.

I now had my basic setup in mind for a site survey tool.  I next ran HDSDR for twenty four hours, generating the proof of concept spectrogram you see on the left in figure four.  You can click the image to see a larger version, and I would recommend you do so.  If you do enlarge the image, you will be rewarded with a mass of data, showing correlated RFI signals everywhere, across megahertz of spectrum, and over very long time periods.

 

The design criteria of getting a feel for RFI over time, and frequency was met, I saw far more than I expected using this method.  Look carefully for the hooked traces, then look to the right or left, somewhere around 50 to 100 KHz., you will see an identical trace, the levels may be different, but the pattern generated is an exact match, this means that the constellation of traces which are all matching, are coming from a single device.  One of the first things I learned was that most of my RFI is coming from far fewer devices than I suspected.

The Antenna:

BWD-90
Figure 4a, BWD-90

I wanted a wideband antenna, so I used a B&W, BWD-90.  This antenna is a ninety foot long TTFD, at an average of 20 feet above ground as the main antenna.  This antenna is reasonably flat in response from 2 MHz., to 30 MHz., so a two Megahertz spread does not suffer from too much roll off in sensitivity, as my vertical would.  This alleviates most slope issues if I keep the bandwidth down.  This further gives me a standard antenna to use in all tests, that hopefully works the same or close to the same at all frequencies.  It turns out it is not as flat across very large sections of spectrum as I might want, so I ended up doing a calibration run for each ham band to at least try and keep things on an apples to apples basis.

First data:

Twenty Four Hours of 30 Meter RFI
Figure 5: Twenty Four Hours of 30 Meter RFI.

I ran HDSDR on 30 Meters for a twenty four hour period, using the GAP Challenger antenna in my back yard, in order to get a long term visualization of of the RFI across the entire Thirty meter band at one time.  The resultant image is on the left, shown as figure 5.  Almost instantly the usefulness of this new method became apparent.  I note what looks like a single source of RFI that tends to wander all over the band, frequency wise, as shown by the twin white lines drifting around in frequency and in tandem with each other.    This clearly shows that the major RFI source in 30 Meters is really a single item, that is saturating the area with RFI that bounces all over.

This sort of observation is good for an overall survey, and it gave me new information.  It also helped me visualize what the RFI on 30 meters in my area looks like.  So, the proof of concept image led me to this image of Thirty meters, you see on the left as figure 5, which instantly showed me new information, (lots of RFI from one source), all of which provides a real overview of the entire RFI environment at my location.  I next set about to do a full survey of my home QTH, on all bands.  As part of the proof of concept image runs, I had learned that I needed to run calibrations to set the base noise levels as measured on my Elecraft K3, to the same levels shown on the SDR.

The Survey:

I set about taking a twenty four hour survey of every ham band from my home QTH, and generating a spectrogram of the data.  Starting with 160, and moving to 6 Meters.  The survey consists of several images, each representing a twenty four hour period of time, across one ham band, with a little extra.  Starting with 160 Meters, and moving towards 6 meters, will take a bit of time– but I am adding spectrograms as I take them.  At the end of the survey is a broader scope image, showing 1.7, through 11.7 MHz., this covers 160, 80, 40, and the 30 meter ham bands, will be taken just to tie in the very wide RFI sources, showing them moving between Amateur bands.

I also began showing the signal strength info which is below the waterfall to show some relative signal strengths vs brightness on the graphs.  This allowed me to get and keep a feel for just how strong a signal was by the intensity of the white on the screen.  I then set about displaying one twenty four hour period for every band as I see them from my home, using the BWD-90 TTFD antenna.  This served as a way to get me familiar with the process, and to develop some standards for taking a spectrograph.  It also documents my RFI in a fully repeatable way.

I am fortunate in that a grower in the area is moving in a few months, so I will be able to see what changes happen when he does.  He lives maybe five blocks from me.  I located him using a magnetic loop and my FT-817ND.  He indicated he was moving, so I will wait to see the moving trucks, then take another survey across all Amateur bands.  Below are the results of that effort.  I will be adding each band as I take the spectrogram of it.  As I build experience, I will refine and document the process for part II.

160 Meters:

Twenty four hours of RFI on 160
Twenty four hours of RFI on 160 Meters

This image is a capture of twenty four hours, starting at local morning.  All times are in UTC.  You can see some interference from the local AM station, as they switch from day to night power.  I suspect this is some image of the local 50KW station, that is three miles from me, that the SDR is showing erroneously.  The lack of RFI here, is probably due to my poor antenna performance on 160, not a clean environment.

 

 

80 Meters:

Twenty Four hours of RFI on 80 Meters
Twenty Four hours of RFI on 80 Meters

This image was started on 09/05/16 at around 3 PM local time.  All times shown are in UTC.  Note the night time openings and activity around the JT frequencies.  Various RFI sources can be seen starting, stopping, and drifting around in frequency, across the entire timeframe.  It appears that there are only three or four sources at play here.  As can be seen this method of visualization of RFI begins to show just how powerful it really is.  I can instantly see that a single source is causing a lot of RFI across the entire 80 meter band.

 

60 Meters:

Twenty four hours of RFI on 60 Meters
Twenty four hours of RFI on 60 Meters

The 5 MHz., WWV signal is shown on the left to indicate actual conditions.  Calibration run was performed, so all of the values you see here are actual.  It looks like three possibly four sources are involved in all the RFI being shown.  You can see the Short Wave stations to the right of WWV.

 

 

 

 

40 Meters:

40 Meters 090316
Twenty Four hours of RFI on 40 meters

This image was started on 09/02/16, at around 3 PM local time.  All times shown are in UTC.  Frequency is across the bottom, time runs vertically, and intensity indicates how strong the signal was.  As can be seen, much of the RFI on forty comes from only a few sources, but they are rich in harmonics.  Note the CW activity across most of the night on 40.  Greyline propagation can be seen in the morning starting around 1330.

 

 

30 Meters:

Twenty four hours of RFI on 30 meters.
Twenty four hours of RFI on 30 Meters.

This is by far the most informative capture so far.  Note almost all the RFI that can be seen is caused by one source, which looks surprisingly like a horticultural light starting up, then drifting, and widening during the startup phase, then finally settling down to almost no RFI.  Note it takes it a long time to stable down.  Also note WWV at 10 MHz, sitting at around S9 plus 5 db.

 

 

 

20 Meters:

20 Meters 09/05/16
Twenty four hours of RFI on 20 Meters

Looking at 20 meters, you can see 5 vertical lines.  I believe all of these are ethernet carriers, they have the look of an ethernet device.  There are a number of repetitive RFI events across the entire 20 meter band.  I am now able to see most of my 20 meter RFI is caused by two, or possibly three sources.  Overall my 20 Meter RFI is not really an issue.  Most of it is below S5 in level.

 

 

17 Meters:

Twenty Four hours of RFI on 17 meters
Twenty Four hours of RFI on 17 Meters

As you can see, very little is here on 17 meters…  I am pretty sure the trace at 18.240 MHz., is an ethernet carrier constellation.  Beyond that, almost nothing RFI wise here…  I thought the antenna might be at fault here, but actual signals can be seen, so the antenna is working.

 

 

 

15 Meters:

Twenty four hours of RFI on 15
Twenty four hours of RFI on 15 Meters

 

 

This spectrogram was taken on 09/24/16, on 15 meters, during the CQ WW RTTY contest.  I wanted a bit of activity to show a contrast to any RFI seen.  I am unsure if all the spatterings are RFI, or images from the SDR.  I will be looking further into this and add the results as an addendum here once I get an answer.  Starting at around 1717 UTC you can see the RTTY stations as hundreds of little dots.  The total band open time is from 1717 to 0120 UTC.

 

Last Updated on January 5, 2023 by Dave, NK7Z

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Last Updated on July 11, 2022 by Dave, NK7Z

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