Here is this week’s space weather and geophysical report, issued 2020 Mar 09 0528 UTC.

Highlights of Solar and Geomagnetic Activity 02 – 08 March 2020

Solar activity was very low. A new spot group emerged in the SE quadrant on 07 Mar and was numbered Region 2758 (S29, L=229, class/area Cro/020 on 08 Mar). No Earth-directed CMEs were observed during the reporting period.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at normal to moderate levels with a peak flux of 923 pfu observed at 02/1455 UTC.

Geomagnetic field activity ranged from quiet to unsettled levels. Solar wind parameters were slightly enhanced midday on 02 Mar as solar wind speed reached a peak of 488 km/s at 02/1318 UTC, likely due to a connection with an extension off the southern crown, polar coronal hole high speed stream (CH HSS). Solar wind speed gradually diminished to nominal levels by 04 Mar. The geomagnetic field responded with mostly quiet conditions with an isolated unsettled period observed on 04 Mar.

Forecast of Solar and Geomagnetic Activity 09 March – 04 April 2020

Solar activity is expected to continue at very low levels.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 19-21 Mar due to CH HSS influence.

Geomagnetic field activity is expected to be reach unsettled levels on 10-11, 18-20, 27-28 Mar and active levels on 19 and 27 Mar due to recurrent CH HSS effects. Mostly quiet levels are expected for the remainder of the outlook period.

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Live Aurora mapping is at http://aurora.sunspotwatch.com/

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Links of interest:

+ Amazon space weather books: http://g.nw7us.us/fbssw-aSWSC
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+ https://Twitter.com/hfradiospacewx

Space Weather and Ham Radio YouTube Channel News:

I am working on launching a YouTube channel overhaul, that includes series of videos about space weather, radio signal propagation, and more.

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You can help!

Please consider becoming a Patron of these space weather and radio communications services, beginning with the YouTube channel:

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The YouTube channel:
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[My apologies. I fumble-fingered WordPress and published a draft version of this article that was incomplete. This is the corrected version. ]

Sometime during the 20th Century, I learned that fuses (or circuit breakers) are used in electrical circuits to prevent catastrophic failure. Fuses open in response to an electrical fault that causes excessive current to flow. The job of the fuse is to minimize the damage and keep things from catching on fire. When I started installing amateur transceivers into vehicles, I learned that you should connect wires directly to the car battery (or darn close) and you should fuse both the positive and negative power leads. I was surprised by the need for two fuses, but there are technical arguments for it. Besides, the transceiver manufacturers recommend it in their manuals. (See figure below.)

I am focusing this discussion on a typical 2m/70cm FM transceiver installation – that is what I have the most experience with and that is the most common ham mobile installation. Such a radio typically draws ~10 A on transmit, so the DC power is usually fused with something like a 15 A (or 20 A) fuse. Keep in mind that a 15 A fuse is not going to protect delicate circuitry but might stop more serious damage or fire.

Connect To The Battery?

Alan/K0BG has an excellent website that provides guidance on mobile radio installations. He points out that modern vehicles usually have an Electrical Load Detector (ELD) inserted into the negative lead of the battery, so that the vehicle control systems can monitor the state of the battery. It is important to connect your radio on the “other side” of the ELD, near where it connects to the vehicle chassis. Oh, and never use the existing vehicle wiring to power your radio (especially not the 12 V accessory plug).

One Fuse or Two Controversy

Recently, I became aware of controversy with regard to proper fusing. Some people are questioning the practice of fusing both DC power leads, while others are vigorously defending it.

For example, there is a lively eham.net discussion here.  Ed/W1RFI provides some useful insight on the ARRL forum.  Alan/K0BG covers the topic of DC power on his wiring and grounding page.  Tom/W8JI argues for the one fuse approach on his website.

What Do The Manufacturers Say?

Generally, you should follow the advice of the manufacturer on any equipment installation, so I took a look at a few owner’s manuals. Most (or all?) of the manuals for the amateur gear show the two fuse method. See the ICOM example below. (Note that they don’t show the presence of the ELD.)

I also took a look at some commercial land mobile radio manuals. Motorola shows the single fuse approach.

Hytera also shows a single fuse in its land mobile manuals.

ICOM makes both amateur and commercial land mobile gear, so I wondered what they recommend for their land mobile product line. Ha, funny thing, they show two fuses, with a comment that says, “Depending on version, the fuse holder may not be attached to the black cable.” Well, isn’t that special?

So is the two-fuse thing some kind of ancient amateur radio practice and the land mobile industry has gone a different path? Sometimes industries adopt “standard” approaches and then forget why with time.

Some Circuit Analysis

After reading through all of the arguments, I tried to distill them down to their essence. I created a wiring diagram that may help explain the concepts. Or maybe not. An automobile is a complex electrical and electronic system, so any practical diagram risks oversimplifying the situation. But here’s my best shot at it.

The center of the diagram shows the body/chassis of the vehicle which is connected to the negative lead of the battery, through the ELD. The transceiver is directly connected to the + terminal of the battery (via Fuse 1) and the chassis side of the ELD (via Fuse 2).  The engine starter is connected to the battery with heavy cables and is also connected to the body/chassis.  While there are a large number of other electrical devices in a modern vehicle, only one is shown here as an example (with a switch and fuse).

The circuit shows the antenna connected to the radio with a coaxial cable. The shield of that cable is almost always grounded to the vehicle chassis at the antenna. (Magnetic mount antennas are one exception and I am sure there are others.) I can say that every mobile installation I’ve ever done had the coaxial cable connected to the chassis. This is an important point because it provides a chassis connection for the transceiver at point C (whether you wanted it or not). There may be other ways that a transceiver is connected to chassis (point B), including the mounting bracket, external speaker, microphone or other accessories.

Arguments For and Against

The argument for fusing the negative lead is to protect against return current from other devices that find its way back to the battery through the transceiver’s negative power lead.  For example, the starter could have a fault in its negative cable, causing the current to flow through the chassis to the transceiver and back to the battery.  The starter current can be hundreds of amperes which would likely overload the radio wire which is sized for 15 amperes. The fuse will open and protect the negative lead (and maybe the radio, to some extent).

The argument against fusing the negative lead is that if the fuse opens up, it could cause problems. Suppose Fuse 2 opens up due to some transient condition. If the transceiver is completely isolated, Fuse 2 would remove power from the transceiver. However, the return path at the antenna coax (point C) will most likely allow the radio to continue functioning using the coax as the negative return. Typically, this is RG-58 or similar cable, which is not intended to carry significant DC current and may fry under the load. If the current is coming from a fault in the starter wiring (big current), this is going to be a bad day for your mobile.

My Conclusions

I think both arguments have merit but choosing one fuse or two requires estimating which problem is most likely and judging the overall impact of the fault. The negative lead fuse can do only one thing well: protect the negative lead. It might provide some protection to the transceiver but there are a lot of sensitive circuits inside the radio that will get destroyed with 15 A flowing. Again, the connection at point C means that the radio will be connected to chassis and current can flow.

If Fuse 2 is eliminated it allows for the flow of high currents through the negative lead of the transceiver. This is not desirable but is it better or worse than the current flowing through the coax shield? Probably better. If a high current device (the starter) has a wiring failure that dumps large currents into the chassis, it may find a number of return paths. Lots of current is going to flow somewhere and potentially cause damage, with or without a negative lead fuse.

I will note that bonding the transceiver to the vehicle chassis has some benefit (point B in the diagram). You may or may not have this connection depending on how you mounted the radio. This electrical connection can shunt any currents away from the coaxial cable, hopefully doing less damage that way.

What am I going to do? My future mobile installations will have only one fuse in the positive lead.  I’ll also bond the radio body to the vehicle chassis, with a hefty, low-resistance connection.

My existing mobile installations all have two fuses. I won’t be changing them out because the risk of inducing a problem with the negative lead fuse is rather low. I don’t see the negative lead fuse as a big risk. If you choose to follow the amateur radio manufacturer’s two fuse recommendation, I understand.

A Request

The amateur radio equipment manufacturers need to give this issue a fresh look. At a minimum, the presence of ELD’s needs to be addressed and the common recommendation of wiring directly to the battery is obsolete. But the one-fuse-or-two issue should also get a careful look by the manufacturer’s engineering teams.

That’s my analysis. What do you think?
(Runs and ducks for cover.)

Note: This article is my technical opinion but my attorney says to tell you that you are responsible if you destroy your vehicle while wiring up your transceiver.

The post Mobile DC Power: One Fuse or Two? appeared first on The KØNR Radio Site.

The hamfest held each year in the St. Louis suburb of Collinsville, IL is called Winterfest. I blogged earlier about the hamfest getting a windfall this year in adding to their growing set of Forums and other programs on contesting and so forth by welcoming the Wes Schum Symposium. Here’s how the Winterfest 2020 Chair described this past January’s events:

The St. Louis & Suburban Radio Club Winterfest has added some great events from previous years. We have added floor space to include Education Alley, doubled our forums and increased our operating hours to 4pm. In addition to these changes, Winterfest has been selected as the ARRL Midwest Conference for 2020. The weekend starts on Friday January 24th with the W9DYV Radio Symposium during the day and a DX/ARRL banquet that evening. Saturday January 25th Winterfest kicks off at 8 a.m. with the opening of the sales floor, VE testing, all day topical Forums, and Contest College starting at 1 p.m. with 10 plus hours of contesting forums and discussion hosted by top area contesters. We invite all hams to come to Winterfest for a weekend of Amateur Radio fun.

Rebecca Carroll, Winterfest 2020 Committee Chair

Kyle Krieg AA0Z, President of SLSRC, and Rebecca KC9CIJ sent me the numbers from the hamfest. They were up 20 percent from the previous year! Wow! How many local or regional hamfests can report that “windfall” in attendance? I don’t have the numbers for that but I don’t think there’d me too many but it’s unfortunate that we don’t have a national set of numbers on hamfest attendance. Hmm. ARRL, if you’re listening, I hope you find those 30,000 hamfest attendance numbers…too soon, Lol?

Nick Tusa K5FF, who chairs the Wes Schum Symposium each year, sent me a list of pre-registered attendees for that specific part of Winterfest 2020. He said that there were a considerable number of walk-up registrants so his list is an under-estimate of this year’s actual attendance. I’ve prepared a map illustrating the “draw” to the Symposium this year in Collinsville (marked with a + sign). If we ignore the extreme distant pre-registrants, it appears to represent the market potential map I created in my previous blog post about where Winterfest could draw from in the coming years. It’s unfortunate that Winterfest per se does not record the call signs of those paid attendees so we could see where their market draw looks like. Perhaps next year!

The 8th W9DYV’s Amateur Radio Symposium wrap-up with video of the presentations can be found at the Central Electronics website. They are well worth watching! They include (with embedded links to the video):

• A High Performance SDR Receiver for the Ham: Bob Nickels W9RAN
• HF Receiver Performance: Rob Sherwood NC0B
• Understanding of Human Speech Articulation: Dr. Bob Heil K9EID
• Wes Schum (W9DYV) and Central Electronics: Nick Tusa K5EF
• Drake T4XC: Low Power Output and Why: David Assaf W5XU
• AM and the story of the Gates BC-1T: Bob Allison WB1GCM
• Vintage Radio and Homebrewing Adventures: Lynn Fisk K5LYN

Windfall for Winterfest 2020? Yep. A 20 percent bump certainly suggests that. Our public relations contributing to that? Yes, but even though there were a lot of eyes seeing both the AmateurRadio.com syndication and the QRZ.com front page articles, it’s a stretch to make such claims and I do not, at all. But our discussions on what Rebecca and her team had planned as well as what Nick was doing by moving the Symposium to Collinsville, IL certainly did not hurt! The fundamentals are the hard work, ingenuity, and willingness to plan for a hamfest that hams would enjoy should they decide to attend. That’s always the case. But it can help if you wave your arms—or get others to wave theirs on your behalf—and let folks know about what you’re planning. Keep an eye out for the St. Louis & Suburban Radio Club’s website for next year. I hear they’re already at work lining up a terrific banquet speaker!

It's time once again for The Weekender. This is our bi-weekly departure into the world of amateur radio contests, open source conventions, special events, listener challenges, hedonism and just plain fun. Thanks for listening and, if you happen to get a chance, feel free to call us or e-mail and send us some feedback. Tell us how we're doing. We'd love to hear from you.

73 de The LHS Crew

A few years ago, the Baofeng UV-5R set a new price point for an entry-level handheld transceiver and quickly became the “easy choice” for a newly licensed Technician. It is a very impressive piece of technology for the money (about $30).

However, it is well known that the UV-5R struggles to meet the FCC Part 97 emission requirements. The ARRL lab has published the results of testing a large number of the Baofeng radios and many of them do not meet the FCC spec. Also, the receiver performance is not that great, primarily with respect to adjacent channel and out-of-band rejection. In other words, it is easily overloaded by strong radio signals.

In response, Yaesu created a low-cost radio using similar technology as the UV-5R but with (supposedly) higher quality. This radio escaped my attention when introduced but some recent reviews caught my eye.  In particular, the QST review of the radio includes a detailed lab test report. (The ARRL does a good job with these test reports.)  The review basically says that this radio performs well, especially considering its price class. The price of the radio is currently about $70, so it is more expensive than the UV-5R, but under $100.

Evaluating the FT-4XR

So I went ahead and purchased an FT-4XR to try it out for myself. The main question on my mind is should I recommend the FT-4XR as a good choice for a new radio amateur. I am a license class instructor for our radio club (W0TLM), so I often encounter new hams that are looking for advice on what radio to buy.

My general impression of the FT-4XR is that it looks and feels like a quality product, giving a better first impression than the Baofeng. It fits nicely in my hand and just felt good.

The usability of the FT-4XR is on par with the Baofeng, but a notch down from something like a Yaesu FT-60. In particular, the FT-4XR loads up the keys with multiple functions: press quickly for one function, press and hold for another function, use the “function shift” key for a third function. Yikes! None of this is labeled so you have to memorize all of this or carry a quick reference card with you. Not a huge problem because these are mostly features that are not used frequently or maybe not at all. This means that the FT-4XR is a radio that needs to be set up via programming software to get the desired memories in place. Then, you just choose the right memory / channel.  Not any worse than the Baofeng and similar to many, many radios on the market these days.

The standard FT-4XR manual is adequate but not great. There is an “advanced manual” available on the Yaesu.com web site that may help. The USA version of the radio does not allow transmit outside of the ham bands. This is probably a good thing, especially for a new user. Some people may see this as a disadvantage compared to the Baofeng, which usually transmits over a wider range of frequencies.

Transmitter Harmonics

I trust the ARRL lab tests but I wanted to measure the transmitter to see the harmonic performance up close and personal. The spectrum analyzer measurement below shows the transmitter with very clean harmonics on 2m, just as I would expect from Yaesu. If you look carefully,  you can see a tiny third harmonic just poking up out of the noise floor. (Sorry about the poor graphics, I just took a quick photo of the screen using my phone.)

The 70 cm harmonic performance is also very solid, as shown below.

I also checked the power output, transmit frequency, FM deviation and receiver sensitivity on both bands. Very solid performance. Again, nice job, Yaesu!

Yaesu Inconsistency

One thing I found disappointing is that the radio operation and accessories are not consistent with other Yaesu radios. I’ve got a decent collection of Yaesu handhelds, speaker/microphones, antennas, programming cables, etc. None of these work with the FT-4XR.  In particular, the FT-4XR uses the male SMA connector (same as Baofeng) and requires a new type of programming cable. However, for the first-time buyer, this doesn’t matter and it is no different than buying a Baofeng.

Some other reviews that you may want to consider:

Recommendations

Back to the main question:

Do I recommend the FT-4XR as a good choice for a new radio amateur?

The answer is YES, this is a better radio than the Baofeng UV-5R and it actually meets FCC Part 97 requirements. If you are considering the UV-5R, scrape up a few more bucks and get the FT-4XR.

If you want an even better radio, I’d suggest moving up to something like the tried and true Yaesu FT-60, about $160. It has a more robust receiver and is easier to use.

The post What About the Yaesu FT-4XR? appeared first on The KØNR Radio Site.

Amateur radio has a demographic problem. In the U.S., there is a clear belief that members of the hobby are old. And getting older. What that means in actual age distribution just isn’t known. Unfortunately, our “visions of gray” are based not upon accurate scientific measurement but on the assembled impressions we get through our personal “windshields” as we go about our daily travels. It’s standard convention to hear us hams urge everyone in hearing or reading range: we need to get more young people into amateur radio!

But whose amateur radio? The extant one driven by us largely gray-haired middle-aged to geezer-dom adult (men)? Yep, that’s the one generally being referred to in this wisdom. Our collective strategy amounts to getting them to come to “us.” How’s that working out for us? Given that our knickers are a bit tangled up over the issue, I’d say not so good.

Lee Corso, the curmudgeonly ESPN television sports announcer, is famous for his Not So Fast! comment when he questions another view or approach to the featured college football game being broadcast. Our attempts to bring new, young hams to our clubs is, in principle, admirable and understandable. But how is that working? Imagine a hobby dominated by young people. Say, competitive eSports (video games). We geezer-dom adults are approached to come to a teen-driven club, learn about it, and then join to continue to attend each month. How many readers would find that appealing? I’d bet not that many.

My recent interview in Episode 319 of the ICQ Podcast with Graham Brody KD9NTQ illustrates the clear market failure that this singular “come to us” approach has yielded. Graham’s interview suggests that while this is a good outreach program for many young prospective hams, it’s not enough to engage them broadly. And, it simply does not reach the market where the most likely candidates are socially engaged. Instead, Graham says help them get started…and get out of their way!

Graham KD9NTQ started the Illinois Young Ham Club to engage young people to converse about ham radio and grow into the hobby. We should listen to him and learn what one approach is to do what we collectively tell one another must happen. Talk is cheap. The walk, well, is just more effort. I’ll let you listen to my interview with him for the nuances of the details. But here are some bullet points that are take-away strategies.

• Do encourage young people to get involved with adult-driven ham clubs. But then encourage, sponsor and assist them to create their own youth-driven groups. Get out of their way but be available to help when called upon!
• Rich environments for exposing young people, both male and female, to amateur radio lie in Maker Spaces and Gamer Groups. Seek out, especially, maker spaces which tend to be advertised in local communities. Clubs should offer to give a demo—not longer than 30 minutes—without a lecture but with an actual demonstration of amateur radio operations.
• ARRL and RSGB should “tag” youth-driven or youth-oriented clubs in their Find-A-Club databases. Graham found the North Shore ARC in the Find A Club database. The Illinois Young People Ham Club, for instance, should be tagged as a youth club as should any others. ALL ARRL-affiliated clubs should report annually the number of members who are less than 25 years of ago so the League can track them. This should be a bench-mark metric to gauge progress in recruiting youth into amateur radio and the League itself. (To my knowledge, the ARRL is doing nothing released publicly to track youth members or contacts.)
• ARRL should offer a “build a club” set of actions to help young inquirers to the League start their own club. They will want to engage with others of a similar age range, Graham says, and the League should explicitly foster that activity, perhaps matching them with an existing adult-driven club for assistance. Be there if asked but get out of their way when they are enjoying the hobby! Walking the walk here as the League has already been talking the talk.
• Should the ARRL and RSGB buy adverts (or give ad swaps) in gaming magazines, promoting ham radio contesting as a greater challenge? Yes! Track the “how did you find out about us” using conventional “use this code” tags in the adverts. If one thinks they’ll just run across QST at their local Barnes & Nobles, they are very sadly mistaken. Graham bumped into ham radio on Youtube!
• Help them get launched. Get out of their way. They will grow into mid-adulthood and join our extant adult-driven clubs. Plant the seed. And get out of their way!

It is unfortunate that many organizations are heavily imbued with a “not invented here” mindset. That is challenging for outsiders to the inner circle of power to break through. See the thread and comment by W9WHE on eHam.net regarding the ARRL, for instance. There are many other examples of this opinion regarding the League. I suppose similar comments could be made about the RSGB, of which I am also a member. But whether “invented” by the central staff or Board of either organization, this teenager has given us a general road map to reaching young people, both boys and girls, similar to him: interested in technology but had to run across something called “amateur radio” on YouTube rather than the explicit efforts of the League. Quit talking without walking.

Graham’s a leader at age 15 already, just won his Extra license, and clearly has an understanding of many of these issues. We have to resist the conjuring up of all the reasons of why they won’t work from a geezer-dom world view. Well, a guy like me can dream, right?

Welcome to the 329th episode of Linux in the Ham Shack. In this short topics episode, the hosts discuss the Coronavirus and Hamvention, open positions at the ARRL, Kubeflow, LineageOS, SRain, Sweet Home 3D and much more. Thank you for listening and hope to see you all in Xenia this May.

73 de The LHS Crew