 |
How Far on VHF SOTA?
20 October 2021 | by Adam/K6ARK recently posted this video of his 2m SOTA activation in California. Adam does a really nice job with his videos and this one is no exception. During this activation, he worked KE9AJ in Arizona at 256 miles. This was an FM QSO, with KE9AJ running 6 watts and K6ARK running over 120 watts.
In the video, he shows the 8-element 2m Yagi antenna, which has a clever folding boom design (homebrew, I assume). You’ll notice that he is carrying quite a bit of gear in his pack, including a 160w amplifier, a Yaesu FT-857, several batteries, the Yagi antenna, and antenna masts. Adam has posted other videos of VHF SOTA activity, so check out his YouTube channel for them.
Note that at 256 miles, this is definitely propagation beyond line of sight. We’ve talked about this before: The Myth of VHF Line-Of-Sight.
This has me thinking about some of my best VHF SOTA activations, which I will list here.
Sneffels to Pikes
In 2012, for the Colorado 14er Event, Joyce/K0JJW and I climbed Mt Sneffels (W0C/UR-001) at 14,150 feet in elevation. I worked Stu/W0STU on Pikes Peak (W0C/FR-004). We both were running 5 watts on 2m FM, with 3-element Arrow II antennas. I had an FT-817, while Stu used an HT. We made the QSO without too much difficulty, at a distance of 160 miles. Stu put together this video that shows the action on both summits.
Capulin Mountain
Capulin Mountain (W5N/SG-009) is out in the middle of nowhere New Mexico, a long distance from populated areas. My goal was to activate it (and get the points) on VHF, but I knew it would be a challenge. I put the word out to the weak-signal VHF community and used my FT-817 (5 watts) and 3-element Yagi to make contacts. My best DX was with Arne/N7KA at 184 miles. I could hear him fine on SSB but he could not copy me, so we switched to CW to complete the QSO. Arne used a 2M12 Yagi antenna with 700 watts of power vs my 5 watts.
This turned out to be a good lesson in what happens when the two stations are imbalanced with respect to RF power. My 5 watts vs his 700 watts is a difference of 21 dB. No wonder I could hear him just fine but he was struggling to copy me. Flipping over to CW narrows the receiver bandwidth, improving the signal-to-noise ratio, and was enough improvement to make the QSO.
Mount Scott
Mount Scott (W5O/WI-002) is a drive-up summit (elevation 2464 feet) in the Witchita Mountains of Oklahoma. It sticks up high enough to have a good radio horizon in all directions. We stopped there to do an activation in March 2018, using the Yaesu FT-90 (set for 30 to 50 watts) and the 3-element Yagi antenna.
We easily worked a bunch of stations on 146.52 MHz FM, including K5RTN in Brownfield, TX. Later, I checked the distance to Brownfield and found that it was 245 miles, which is still my best SOTA DX on 2m FM. There was probably some favorable propagation that morning, perhaps some ducting, for this to occur. K5RTN was operating from home and I am not sure about his power and antenna.
Threemile Mountain
During the 2021 January VHF Contest, we decided to activate Threemile Mountain (W0C/SP-107), which is usually accessible, even in the winter months. Because it is in the Pike National Forest (K-4404), I did a combo operation of SOTA, POTA, and VHF contest. At 10,020 feet in elevation, it is not the highest summit in the region but it has a good radio horizon in all directions.
Also, the hike is relatively short, so I packed the Yaesu FT-991 and a 20 Ah battery, which gave me more power (50 watts) on 2m and 70 cm. Not only that, I actually fired it up below 50 MHz and made some HF contacts, using single-band end-fed halfwave antennas.
I was working a few stations in Denver on 2m SSB when I heard Larry/N0LL calling me from Smith Center, KS. Larry is a well-known Big Gun on VHF with excellent antennas. I’ve worked him in past contests on various bands and modes but I was surprised how strong he was coming in at Threemile Mountain. We probably had favorable conditions on 2 meters that day but nothing exotic, to make a 372 mile QSO. I’ve worked longer distances on 2 meters but this is my best DX for SOTA.
Power and Antenna
Most ham transceivers have decent receivers, so the choice of radio on the receive side is not that critical. (OK, you can add a preamp in front of the receiver to improve it.) The big difference for making QSOs (or not) on 2 meters is antenna and power level.
Improving your antenna is normally the first step in improving your VHF SOTA station, because it helps on both transmit and receive. Joyce/K0JJW and I almost always use the 3-element handheld Yagi from Arrow Antenna. Arrow does not specify the gain, but various sources have measured it at 6 dBd. We have made many QSOs over the years where the extra 6 dB made the difference. An omnidirectional antenna would have come up short. I’ve been looking for a higher gain antenna to use for SOTA but have not found one that I like. Adam’s 8-element antenna is tempting but longer antennas pretty much require a mast, which adds weight to the pack. One of the benefits of the 3-element Arrow is that it is handheld, so we don’t carry a mast. Of course, having two of us activating together really helps…one person can hold the antenna while the other operates and logs. A handheld antenna with a single operator can be a challenge.
Concerning power level, the Capulin QSO with N7KA illustrates what happens when two stations are imbalanced with respect to RF power. After this experience, I did purchase a small 2m amplifier that boosts the 5 watts from the FT-817 to 35 watts. It is compact and not too much of a DC power hog. I think we also heard an imbalance with the QSO between K6ARK and KE9AJ. KE9AJ’s signal was a bit noisy at K6ARK while K6ARK’s signal was full quieting 59 at the other end. This is not a surprise with K6ARK at around 120 watts and K6ARK at 6 watts (13 dB difference).
For higher power on 2 meters, you generally need to bring a bigger radio or an amplifier. The popular HT is generally limited to about 5 watts. For 2m FM, we’ve been carrying the Yaesu FT-90, which is a pretty compact radio and can put out 50 watts of RF power (FM only). On the Threemile Mountain activation mentioned above, we took the FT-991, which is not very SOTA friendly, but it also does 50 watts on 2 meters…and all modes.
Battery capacity also comes into play as higher power requires more DC current. The FT-90 manual says it draws 9.5 amps at full 50 watts of power on 2 meters. (We usually run it at lower power but will punch it up to 50 watts when required.) The FT-991 manual says it draws 15 amps when transmitting at full power on 2m or 70cm. My 160 watt 2m (Mirage) amplifier can draw up to 30 amps on transmit. Wowzy, that’s some real current! The point is that as you increase power, you need to look at your battery situation more carefully.
It might sound like I am suggesting that we should maintain a power balance between the two stations. That’s not the case and is often not even practical. When one station is much stronger than the other, it can be used to advantage. The stronger station is easily heard and the weaker station can point the antenna in the right direction to peak up the signal. The weaker station consistently hears the stronger station, so now the challenge becomes to just get a few seconds of successful transmission in the opposite direction. You keep trying until the weaker station manages to get through. Compare this to having two lower power stations trying to make a contact. They may not even hear each other at all because the antennas are not pointed optimally. When they do hear each other, they are both struggling to hear the other station and complete the QSO. This lowers the probability of completing the contact.
So how much power should you run on 2 meters for SOTA? Of course, More Is Better, except for the extra weight in your backpack. The difficulty of the hike comes into play…on shorter hikes, weight does not matter so much. I am finding that 5 watts is on the skimpy side. On the other hand, going much above 50 watts requires larger batteries, so I am thinking the sweet spot is around 30 to 50 watts. If I do happen to work a base station running 1kW, my signal will be 13 dB lower with 50 watts (worst-case scenario). This is just my opinion, your mileage may vary.
Summary
So can we all agree then that VHF signals can go beyond line-of-sight? These examples are basic tropospheric paths and do not include the exotic propagation modes such as meteor scatter, sporadic-e, aurora, EME, etc. I’ve used most of those modes to work longer distances but not during a SOTA activation. Most hams know that SSB and CW are more effective than FM when signals are weak. In fact, FM weak-signal performance is lousy. Still, we see multiple examples of making some long-distance contacts with FM.
73 Bob K0NR
The post How Far on VHF SOTA? appeared first on The KØNR Radio Site.
Bob Witte, KØNR, is a regular contributor to AmateurRadio.com and writes from Colorado, USA. Contact him at [email protected].
Hunting For NDBs In CLE273
 |
| BK-224 Baker Lake, NU ( http://www.ve3gop.com) |
BK has gobs of power and a big antenna ... see if you hear it!
When tuning for NDBs, put your receiver in the CW mode and listen for the NDB's CW identifier, repeated every few seconds. Listen for U.S. NDB identifiers approximately 1 kHz higher or lower than the published transmitted frequency since these beacons are modulated with a 1020 Hz tone approximately.
For example, 'AA' near Fargo, ND, transmitted on 365 kHz and its upper sideband CW identifier was tuned at 366.025 kHz while its lower sideband CW ident could be tuned at 363.946 kHz. Its USB tone was actually 1025 Hz while its LSB tone was 1054 Hz.
Often, one sideband will be much stronger than the other so if you don't hear the first one, try listening on the other sideband.
Canadian NDBs normally have an USB tone only, usually very close to 400 Hz. They also have a long dash (keydown) following the CW identifier.
All NDBs heard in North America will be listed in the RNA database (updated daily) while those heard in Europe may be found in the REU database. Beacons heard outside of these regions will be found in the RWW database. These databases have recently been re-vamped and are slicker than ever before!
From CLE organizers comes the following CLE info:
Hello all,
Here are brief details of our 273rd co-ordinated listening event, less than a week away. Ideal to try out a CLE for the first time?
Days: Friday 22nd - Monday 25th Oct., Midday-Midday, your local time
- NDBs from 190 - 239.9 kHz
- PLUS: Normal NDBs with carriers on the 'half-way' frequencies nnn.5 kHz from 190.5 - 999.5 kHz
So, unusually, it is a CLE in two parts. The first part is hunting for the NDBs whose published frequencies are lower than 240 kHz.
The second part is hunting for the NDBs whose carrier frequencies are 'half-way'. E.g. 267.5 OPW, 333.5 VOG, 370.5 LB, 381.5 SJX (in Ml), 390.5 ITR, 427.5 OB (in AFS), 433.5 HEN and 514.5 LA
Most Europe listeners will hear few or none from part 1, while listeners away from Europe will hear few or none from part 2.
The last time we covered these frequencies was for CLE257 in June 2020.
Please log all the NDBs (within the frequency ranges specified) that you can identify plus any UNIDs that you come across there.
Send your final log to the List (not in an attachment, please) with 'CLE273’ and ‘FINAL' in its title (important).
Show on each line:
# The Date (e.g. '2021-10-23', etc., or just '24' )
# The Time in UTC (the day changes at 00:00 UTC).
# kHz - the nominal published frequency, if known.
# The Call Ident.
Please show those main items FIRST. Other optional details such as Location and Distance go LATER in the same line.
As always, of course, tell us your own location and give brief details of the equipment that you were using during the Event.
We will send the usual 'Any More Logs?' email at about 19:00 UTC on Tuesday so you can check that your log has been found OK.
Do make sure that your log has arrived on the List by 08:00 UTC on Wednesday 27 October at the very latest.
We hope to complete making the combined results within a day or two.
You can soon find full details about current and past CLEs from the CLE page http://www.ndblist.info/cle.htm It includes access to the CLE273 seeklists for your part of the World, prepared from all the previous loggings in Rxx.
Good listening
- enjoy the CLE.
Brian and Joachim
------------------------------------------------------------------
From: Brian Keyte G3SIA ndbcle'at'gmail.com
Location: Surrey, SE England (CLE coordinator)
------------------------------------------------------------------
(If you would like to listen remotely you could use any one remote
receiver for your loggings, stating its location and owner and with
their permission if required. A remote listener may NOT also use
another receiver, local or remote, to make further loggings for the
same CLE)
These listening events serve several purposes. They
• determine, worldwide, which beacons are out-of-service or have gone silent since the last CLE covering this range
• will indicate the state of propagation conditions at the various participant locations
• will give you an indication of how well your LF/MF receiving system is working
• give participants a fun yet challenging activity to keep their listening skills honed
Final details can be found at the NDB List website, and worldwide results, for every participant, will be posted there a few days after the event.
The NDB List Group is a great place to learn more about the 'Art of NDB DXing' or to meet other DXers in your region. There is a lot of good information available there and new members are always very welcome. As well, you can follow the results of other CLE participants from night to night as propagation is always an active topic of discussion.
You need not be an NDB List member to participate in the CLEs and all reports, no matter how small, are of much value to the organizers.
Remember - 'First-time' logs are always VERY welcome!
Reports may be sent to the NDB List Group or e-mailed to CLE co-ordinator, Brian Keyte (G3SIA), whose address appears above. If you are a member of the group, all final results will also be e-mailed and posted there.
Please ... give the CLE a try ... then let us know what NDB's can be heard from your location! Your report can then be added to the worldwide database to help keep it up-to-date.
Have fun and good hunting!
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].
LHS Episode #436: Bowling for Ham Radio
Hello and welcome to Episode 436 of Linux in the Ham Shack. In this short-topics episode, the hosts discuss an ARDC grant for high school STEM students, a pair of intrepid amateur radio hobbyists, state-sponsored ARCs in Africa, Ubuntu 21.10, Sysmon for Linux and much more. Thank you for listening and have a great week.
73 de The LHS Crew
Russ Woodman, K5TUX, co-hosts the Linux in the Ham Shack podcast which is available for download in both MP3 and OGG audio format. Contact him at [email protected].
Worked All Germany (WAG) contest.
The Worked all Germany (WAG) contest was this weekend. It's an event in which you can operate both CW and SSB. I chose the CW only option for the contest. I entered low power (100 watts and under), single op and assisted (using spotting new works) It was very well attended and during the contest I received a station from Israel calling German stations. It was a shame I could not call him, as with this contest DX can only contact German stations. Oh well, it was nice hearing them anyway.
The contest is 24 hours long, which is nice as it does not occupy all of your weekend. Conditions were good for me on 15m, 20m and 40m. I did try 80m on Saturday evening, but it provided no contacts for me. On Sunday I stayed on 15m as I was up early and the band was open. I wanted to stay away from 20m for as long as I could, as this was the band I mainly stayed on during Saturday. This way I would not run into Dupes on 20m. The contest software I used was N1MM+.
I was using my Icom 7610 radio which for contesting is a great radio, the antenna was my Ultimax DXtreme it's 52 feet long and about 30 feet off the ground and about 6 feet at the feed end. I used my solid state CW paddle by 9A5N. The key worked very smoothly and worked without issue.
Speaking of issues, it would not be a contest if there were not some hiccups. First off I thought (for some reason) the contest started at 1600 UTC. I sat at the radio 10 minutes (1550 UTC) before the contest started. I was shocked to see the band's full when I turned on the radio. A quick investigation on my part had me realize the contest started at 1500 and not 1600 UTC, so I was an hour down before I even started.
At times, I found myself calling a station, and I was not being heard, don't get me wrong this does happen but not with stations that are booming in. Out of the corner of my eye I noticed N1MM+ software was showing me that my transmit XIT (transmit increment tuning) was on! The reason the station was not hearing me was because I was transmitting way off-frequency. This for some reason happened a few times.
The last comedy of errors was at one point on Sunday when I was on 15m the band just went dead! Hmm, maybe propagation on 15m just dropped off. I went to 20m, and it was the same, so I checked the solar conditions, maybe I missed a huge storm forecast. Nope solar conditions were fair.....oh wait a minute it's 1500 UTC and the contest is over!!
Contest summary
40m 34 contacts with 18 multipliers
20m 51 contacts with 21 multipliers
15m 30 contacts with 17 multipliers
Total contacts 115
Score 19,320
Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].
AmateurLogic 161: Our 16th Anniversary
AmateurLogic.TV Episode 160 is now available for download.
Celebrating 16 years of AmateurLogic.TV.
Peter, VK3PB drops in for and update from downunder. George shows some of his favorite tips and projects from the last few years. Tommy demonstrates a neat battery capacity tester. Emile discovers new Cheap Tricks with Echolink.
Announcing the winner of our 16th Anniversary contest!
Cliff Boand, WA0JTW will receive an Icom IC-705 Transceiver, AH-705 Auto Tuner, LC-192 Backpack, MFJ-4230MV Power Supply, MFJ-2012 OCF Antenna, and RG-8X coax.
George Thomas, W5JDX, is co-host of AmateurLogic.TV, an original amateur radio video program hosted by George Thomas (W5JDX), Tommy Martin (N5ZNO), Peter Berrett (VK3PB), and Emile Diodene (KE5QKR). Contact him at [email protected].
Brashear’s Stand: Still Being Used for a Break in the Day
The history of the early 1800s in the United States’ development holds meaning for today. More than we tend to realize. Back before Mississippi was a state, the Federal Government called it “I.T.,” short for Indian Territory. Territories were not “settled” from a Federal viewpoint. During those times, many footpaths established by Native American Tribes—for instance, the Choctaws—became passable roads for travel by foot, horses, carriages and stage coaches. The opportunity for interim settlers, mostly whites but not always, became obvious: Where are the Holiday Inns of the day? There were some, of course, but they were rudimentary places along the paths from here to there, offering a break in the daily travels, food, drink, and overnight accommodations. They were typically called “Stands,” and most often had enslaved peoples working there.
Inns, or stands, provided occasional shelter for travelers along the Natchez Trace from the 1790s to the 1840s. These stands offered food to eat and food for thought: local news, information, and ideas. The ever-changing mix of diverse people – whites, American Indians, African Americans – interacted at the stands on a regular basis.
National Park Service
My portable operations team, consisting of Mike N5DU, Thomas N5WDG, Mike K5XU and myself, availed ourselves of such a break in the daily tasks on Saturday, October 9, 2021 to activate the historic site of Brashear’s Stand on the Natchez Trace Parkway in Ridgeland, MS. It’s just a mile or two from my house. Here’s what it was like back more than a century ago:
Brashears Stand
Brashears Stand is named after Turner Brashears, who moved to the area in the late 1700s. He became a trader with the Choctaw and learned their language.
“In 1806 Turner Brashears placed an advertisement in the Natchez newspaper about his stand labeling it “A house of Entertainment on the road leading from Natchez to Nashville.” Travelers on the Natchez Trace generally seemed to be pleased with their treatment and accommodations at Brashears Stand. In 1807 Reverend Jacob Young, a Methodist preacher, wrote “Near the line that divided the Choctaw Nation from the Mississippi Territory stood a fine public house kept by a man by the name of Brashears…He treated us very well but knew how to make a high bill.” In addition to earning money from his stand operation, Brashears prospered by selling land and enslaved people.” (National Park Service)
The Stand no longer exists but it’s a testament to what we hams sometime take for granted when we get outdoors to enjoy our hobby. One inspiration of mine to better understand these environs is the well-known POTA and SOTA activator and blogger, Thomas Witherspoon K4SWL (see QRPer.com). He is always appreciative in his blog posts about the park or summit he’s activating. This area was the location my team chose for our very first POTA activation. Here’s the setup, two permanent picnic tables with 100+ foot pines. That and perfect weather make for an enjoyable time whether the band conditions follow suit or not.
The four of us paired up at each of the two permanently mounted picnic tables. We placed old sheets on top of the tables. You may guess why since there are lots of birds in the area! We used N5DU’s Xiegu G90 (the one Rob Sherwood tested for his website) for FT8, K5XU’s Kenwood 590s for CW, and my new Icom IC-705 on it’s maiden voyage. Mike K5XU has been blind since birth and is a 50 year amateur licensee and career broadcaster. (Learn more about Mike’s amazing life and career on the ICQ Podast episode 299 here.) He is the CW op for our team. Thomas N5WDG is a wide area network engineer covering several states for AT&T and is one of my engineering Elmers. Mike N5DU has become our FT8 leader. I can neither deny or confirm that he uses the G90 bedside at night to work other countries via FT8. Mike is the State of MS RACES Officer for the Emergency Management Agency and practicing attorney in Jackson MS.
Mike K5XU (left) and Frank K4FMH (right), logging for K5XU 
Thomas N5WDG (left) trying out the IC-705 and Mike N5DU (right) using his G90 on FT8
Given the tall pines in this small park area, we used three EFHW antennas I had built in the past month. I ran across an eBay vendor, John KG6ZBN (seller name eddieson), who was selling both 1:9 and 1:49 UnUns for $10-$12. I could not source the parts for that! Since George at Packtenna was out of stock on his EFHW antennas, I just bought several of John KG6ZBN’s EFHW UnUns as shown below for the 1:49 model. I did follow George’s build specs using the #26 Silky Wire from The Wireman. This wire for low power is a wonder. One of the EFHW’s is shown below with inexpensive plastic kite winders to manage the wire. I use S-hooks to link the kite winder in the air to very small paracord once I have the latter over a tree branch or something. A sweep of one of the 1:49 EFHW is shown using a RigExpert Stick analyzer and Antscope illustrates the resulting SWR dips in the HF bands. The bluetooth-connected “blue stick” was connected at the SO-239 connector of the EFHW before hoisting up in the air so the coax is not in the system on these measurements. I was very pleased with these results.
John KG6ZBN’s 1:49 UnUn ($10 + shipping) 
EFHW As Built 
SWR Sweep of EFHW using 133′ #26 Silky Wire. 17′ Counterpoise
So how did our first POTA activation go in an otherwise ideal Saturday for doing some amateur radio? Not bad. Not bad at all. I posted our activation on both the POTA.app and on the Parks on the Air Slack Channel. Some tweeted that they tried to reach me on SSB while I was using the IC-705 at 10 watts. Most were a no-go except the one SSB contact from Arizona giving us a “true” 599 report. We had 59 contacts in all, but dropped one due to a busted call sign. The map below shows the range by mode. SSB is green, CW is red, and FT8 is yellow.
Mike K5XU’s 30 watts on CW worked very well as he is a master operator in that mode. Catching Alaska and Puerto Rico on 30 watts was not surprising. Mike N5DU’s FT8 power was 10 watts (5 watts for the first two). Working Guatamala and Sardinia on 10 watts using an EFHW was nice. N5DU added his DX Engineering Bandpass Filter box which significantly reduced interference between his FT8 rig and my SSB rig sitting just a few feet apart. My poor SSB showing, except for the one QRP contact out to AZ in their State QSO Party, was not to be unexpected. Nonetheless, as my friends Scott K0MD and Thomas K4SWL told me, my first deployment of the IC-705 was better than imagined in terms of how the rig operates and the features it contains. I did connect it the day before to my amateur radio laptop (Thinkpad 420s) on my patio via USB and tested a 1:9 EFHW strung head-high between two bushes in my garden. This is the very first rig that has connected immediately to WSJTX after two settings: rig selection of the 705 in the software and pressing the on-screen menu button for FT8 Preset on the 705. I immediately began receiving and decoding FT8 signals! One contact convinced me that I had that mode in the bag on the 705. Well done, Icom!
Lunch was served at my house a couple of miles away after our noon shutdown. Fried catfish from nearby Cock of the Walk restaurant, hush puppies, corn bread, fried onion rings and pickles were the main course. To finish off our meal, apple pie or brownie a la mode with chocolate peanut clusters were served. We dined on our screened porch with a breeze off of the Barnett Reservoir flowing through the solar shades. While not the healthiest diet, and one we do not eat often, a good time practicing this aspect of our hobby was had by all. We plan to continue POTA activation’s, and perhaps the one SOTA entity in the State, in the future. Having a group of ham radio friends like this makes the hobby most pleasurable. Now, I need to get that log submitted to my POTA manager!
Frank Howell, K4FMH, is a regular contributor to AmateurRadio.com and writes from Mississippi, USA. Contact him at [email protected].
LHS Episode #435: The Weekender LXXX
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
Russ Woodman, K5TUX, co-hosts the Linux in the Ham Shack podcast which is available for download in both MP3 and OGG audio format. Contact him at [email protected].
 Ham Radio Deluxe |
 Ham Radio Prep |
 Ham Radio School |
 KB3IFH QSL Cards  Hip Ham Shirts  HamRadioAuctions Reliance Antennas Enigma Shop |  morseDX  Ni4L Antennas  R&L Electronics antennas.us Ears to Our World |
- Matt W1MST, Managing Editor
