An easily accessible, multi-function button on the IC-705’s “back rim” gives a great improvement over the stock noise reduction. (ICOM, with all your resources, why can’t you design a DSP NR circuit that works as well as BHI’s? )
I admit it! I’m in love with BHI Ltd.’s DSP noise reduction accessories. I’ve owned most of their popular models like the DSP Desktop Speaker, and have installed BHI low-level audio modules in six different receivers and transceivers.
How is it that an audio-based DSP noise reduction accessory can be so effective? Only BHI knows, but they clearly have top-notch algorithms that rival the best of noise reduction circuits in contemporary Yaesu transceivers. (Personal bias alert: I find Yaesu’s approach to noise reduction (“DNR” in Yaesu-speak) to be quite superior to ICOM’s, and this is what got me thinking about improving the transceiver with an internal BHI NEDSP1901-KBD module in the first place.)
The noise reduction feature in the IC-705 and its IC-7300 base station counterpart is merely “OK” in my opinion, but the addition of BHI’s NR makes a significant difference in S/N and intelligibility of signals. It’s simple enough to use an external BHI product and connect it to your rig’s speaker or headphone’s audio path, but it adds wiring and complexity. The ICOM IC-705 modification described in this article is a neat, clean, internal solution needing no external wiring or power supply.
Many thanks to Don (W7SSB) who notes that Xiegu has now added a portable power station to their product line:
The new Xiegu BK300 has a form factor much like power stations in the popular Jackery product line.
The BK300 features:
a 296Wh Lithium [I assume Li-Ion] battery
one 12 volt, 10 amp, DC output
a pure sine wave inverter with 110V output rated at 300W continuous and 350W surge/peak
three USB-A and one USB-C charging ports
recharging via USB-C, AC, DC input, and solar panel
a large LED light with diffuser
I’ve never purchased a power station to power my QRP rigs as I’ve always preferred simply using small LiFePo4 battery packs with my own DC accessories. I feel like this is a more cost-effective and simple approach for radio operation (plus, LiFePo4 batteries have insane longevity and shelf-life).
With that said, Li-Ion power stations like the BK300 are absolutely brilliant for camping and for all of those times you might need to power consumer electronics off-grid (including when the grid might be down at the QTH).
In the past, I have tested similar power stations, but their inverters were modified sine wave and injected unacceptable amounts of noise in my radio gear. Hypothetically, a pure sine wave inverter should not generate broadband RFI. Of course, this would need to be tested in real-world conditions.
If the inverter is indeed quiet, this might make for a great power station for camping–I had been considering a similar Jackery, but the price point on this one is actually lower for similar features and capacity. Radioddity has listed a discounted pre-sale price of $200.
Since they’re a sponsor of the SWLing Post, I’m mighty tempted to ask Radioddity for a loaner, else buy one outright.
Curious if any readers would like me to check it out? If there’s interest, I’ll get the ball rolling. Please comment!
A revised prediction from the NASA High Altitude Observatory based at the University Of Colorado.
NASA Heliophysicists have released a revised prediction for Solar Cycle 25.
The report generated by Ricky Egeland a Solar Physicist working in the NASA Space Radiation Analysis Group now calls for the peak of Solar Cycle 25 to top out at a value of 195 ± 17 based upon the new scale for calculating Smoothed Sun Spot Number. For reference Solar Cycle 21 peaked at an SSN 233 (new scale) while Solarcycle 23 peaked at an SSN of 180 (new scale). If this predictions holds up Ham Radio will see Excellent Worldwide F Layer Conditions on 10 Meters for several years around Solar Max. 6 Meters conditions should be good in the Equinox Periods before and after Solar Max with consistent openings on Medium Haul Polar Routes. 6 Meter routes traversing the equator should experience consistent openings ± 9 months from Solar Max.
Ricky Egeland is a particpating member in the group headed up by Scott McIntosh and Bob Leamon that published a paper 9 months ago outlining the existance magnetic bands within the Sun that govern the Sunspot and Hale Cycles. At the time of its publishing the paper went on to predict the peak of Solar Cycle 25 could be as high Solarcycle 21. Today’s released is a revised prediction based upon data observed since the original paper was published. To be sure we are still in early days.
The Solar Rotation Cycle as marked by Sunspot Activity was established on April 19, 2021 so we are only 90 Days into actually observing Cycle 25 Activity. It is now agreed the dramactic run-up in Sunspot Activity we experienced late Last Fall while tied to Cycle 25 was an outlier. When asked directly about whether they can declare if the Terminator Event they wrote about in the Fall 2020 Paper has occurred Scott McIntosh stated “We can’t be sure just yet but we are very very close”. It also should be noted that while it has been over a year since the sun produced a Cycle 24 Region with a Sunspot worthy of a NASA Classification the Sun has been steadily producing Spotless SC 24 Active Regions the last of which formed right on the Solar Equator at N00-W54 on July 24,2021 as recorded by Jan Alvestad’s Solar Terrestial Activity Report Website. These Active Regions being part of a Solarcycle in its final stages of existence produce no spots and only last for a few hours before they dissipate away. The previous SC24 Active Region formed on June 28, 2021. Once the SC24 active regions cease forming Solar Cycle 25 will take off in earnest.
After a successful SOTA and POTA activation at Hanging Rock State Park on Tuesday, July 13, 2021, I drove to nearby Pilot Mountain State Park. It was quite warm, but a beautiful day with no afternoon thunderstorms in sight.
I couldn’t pass up the opportunity to play a little more radio. As the French say, “Il faut en profiter!”
Although I’ve seen Pilot Mountain numerous times in my travels, I had never actually visited the park so this was a new-to-me park activation.
Pilot mountain is a landmark in the Yadkin river valley and has a fascinating back story.
Per Pilot Mountain State Park’s website:
“Pilot Mountain is a remnant of the ancient Sauratown Mountains. A quartzite monadnock, this rugged mountain rock has survived for millions of years while the elements have eroded surrounding peaks to a rolling plain.
Pilot Mountain is capped by two prominent pinnacles. Big Pinnacle, with walls of bare rock and a rounded top covered by vegetation, rises 1,400 feet above the valley floor, the knob jutting skyward more than 200 feet from its base. Big Pinnacle is connected to Little Pinnacle by a narrow saddle.
The mountain was mapped in 1751 by Joshua Fry and Peter Jefferson, father of President Thomas Jefferson. Pilot Mountain became North Carolina’s 14th state park in 1968. The Pilot Mountain Preservation and Park Committee proposed the establishment of Pilot Mountain as a state park in order to protect it and the surrounding area from commercial development. The group secured options on the land and raised matching funds that made it possible to purchase with
federal grants.”
Pilot Mountain is a SOTA summit, but it has never been activated because it would require an experienced rock climber (assuming access is even allowed). The base of Big Pinnacle is 61 meters above the summit trail system, so well outside the 25 meter activation zone.
Pilot Mountain State Park (K-2750)
I only had my sights set on making a park activation out of Pilot Mountain and, frankly, I didn’t even have time to explore the trail system that Tuesday.
Finding a spot to set up was quite easy. I entered the park and took a right at the roundabout which lead to the parking area at the top portion of the mountain.
From there, I found a small picnic area perhaps 50 meters from the parking lot. I carried my gear there and set up shop!
Since I was doing this activation mid-afternoon, I had the picnic area to myself, save one unfortunate woman who was trying to (conspicuously, if I’m being honest) fit in a bit of meditation time. She picked out a picnic table near one of the main trails basically in the center of the picnic site , so I assumed she was pretty good at blocking out noises you’d normally hear at a busy park.
But the question remained: could she block out the sweet sound of CW emanating from my FT-817?
There was only one way to find out!
In truth, I try to lay low at parks and not disturb other people. In this case, I picked a table on the perimeter of the picnic area but it was still only a couple tables away from her. Since I was making one of my real-time, real-life field activation videos, I would be using the speaker–instead of headphones–with the FT-817.
In other words, there was no escaping a little CW music!
I shared my picnic table with this little Praying MantisI think he’s upset that my throw line is all over *his* ground.
This was also the first time I’d used my new orange single-level CW Morse paddle very kindly gifted to me by contributor/subscriber, Nathan (N8HWV).
Although it might look like a dual lever paddle, it’s actually a single lever!
Thank you so much, Nathan!
On The Air
I started on 20 meters CW and, fortunately, it was hopping!
I worked 18 stations in 19 minutes. Whew!
Many thanks to N2EIM and NA9M for the P2P (Park To Park) contacts!
I then moved to 40 meters where I worked K8DRT for a second time (first was on 20M) and my “it wasn’t a real activation unless I worked him” buddy, K8RAT.
40 meters wasn’t in as good of shape as 20 meters was.
Having no way to spot myself to the POTA site, I didn’t attempt any SSB contacts–I would have at least for a while, otherwise.
Video
Here’s a real-time, real-life, no-edit, no-ad video of the entire activation:
I discovered something you might have an interest in for your wire antenna deployment. Years ago when I was a building contractor, we used chalk line for floor layout. It has a very high tensile strength and is very light weight. After reflecting on this, I recently bought a 100’ spool of braided 1 millimeter chalk line and used it for a field deployment. I attached my “throw weight” to it and easily launched it about 60’ into a tree. You can see it in the attached photo holding my homebrew EFHW to my Jeep.
The magnet wire was scavenged from a HUGE transformer from a neighbor’s discarded light fixture.
Lug Nut Throw Weight: left hand threaded from a 1966 Plymouth Fury
I did the new installation for him and he gave me the old one. I promptly disassembled it and collected miles of 14 and 20 gauge magnet wire ?!
I haven’t added the capacitor to this antenna yet because it is sufficiently resonant and broadbanded on 40, 20, 15, and 10 Meters. I did some testing with the capacitors though on my previous build which was the PVC tube EFHW transformer. I believe I may have sent you a photo of that in a previous message. It too was resonant in the same places, but adding the capacitor smoothed and widened the acceptable SWR range.
The attached photos are my complete antenna assembly: matching transformer (49:1), 65.5’ speaker wire, 100’ braided 1MM chalk line, and throw weight (epoxy filled lug nut with short paracord pigtail).
Compact and lightweight.
Dan/ KQ8Q
I love this, Dan! I also like how self-contained and compact it is. What a professional job, too, with heat shrink, proper connection points and tie-offs.
Brilliant work!
Do you have an antenna or radio project you’d like to share on QRPer.com? Contact me!
The Yaesu FT-817/818 (left) and lab599 Discovery TX-500 (right)
A reader asked this morning:
“[W]hat’s the toughest HF QRP transceiver on the market? I want a rig with good field performance and features, but I what I really want is something rugged…something that might survive falling off a rock or log while I’m doing a little SOTA.”
It was a no-brainer to me: either the lab599 Discovery TX-500 or Yaesu FT-818/817.
I feel lucky in that I’ve acquired a number of excellent QRP transceivers over the years. Most of my field-worthy radios are acceptably rugged, but the TX-500 and the FT-818/817 really stand out.
The Discovery TX-500
The Discovery TX-500 was designed from the ground up to be a rugged, weather-resistant portable radio that could operate in challenging environments (think the extremes of Russia where it’s manufactured).
If I’m heading outdoors and it could rain or snow? I’ll be grabbing the TX-500 for sure. It’s a brilliant portable radio
Yaesu FT-818 or FT-817
My Yaesu FT-817ND paired with the Elecraft T1 ATU
While the Yaesu FT-818/817 has no serious weather-proofing, it does have an incredible study chassis like the TX-500 and was obviously designed for outdoor use. Both of my FT-817NDs have side rails and with those in place, I really feel like it would easily survive falling off a rock or log. In addition, I’ve heard stories of the FT-817 surviving some hard falls–that goes a long way for me. No doubt, it’s a study little rig!
The X5105: A close runner up?
I’ll admit that the Xiegu X5105 feels like a very study radio as well. The chassis is made of an aluminum alloy and feels rigid. Mine has a polycarbonate screen protector. I also like the fact that its buttons and the main encoder are all low-profile. It’s still pretty new to me, but it’s obvious Xiegu designed the X5105 to be rugged. If it fell off a rock during a SOTA activation, I wouldn’t worry too much.
Admittedly, I feel like the X5105 wouldn’t be terribly weather-resistant–the buttons are somewhat recessed and the button openings are quite large, likely allowing water intrusion. Of course, I haven’t cracked mine open yet (it’s still under warranty and is sealed), so I’m assuming there’s no effort to stop water intrusion internally.
Do you need a “rugged” transceiver?
That’s up to you.
One of my favorite portable transceivers is the Elecraft KX2. I’ve taken it everywhere. I’ve dropped it, it’s rolled off my clipboard, I’ve got caught in the rain with it, and I’ve even slid and fallen on my backpack when it was stored inside. I wouldn’t classify the KX2 as a “rugged” transceiver, yet it’s survived all of this without even sporting side rails (like its bigger brother, the KX3).
You can add after-market side rails to the Elecraft KX3–and to most field radios–which will protect the encoder and front panel buttons/knobs.
At the end of the day, if you like to operate in extreme conditions, put ruggedness at the top of your priority list. Otherwise, simply protect your transceiver in transport with a good waterproof case or padded/waterproof pack. If you’re worried about rain or water, bring a rain jacket or portable fly/canopy to protect you and your rig during operation.
Did I miss something?
What radios do you consider to be some of the most rugged on the market? I’m certain I’m overlooking some. First hand experience would be most welcome! Please comment!
By Evgeny Slodkevich, UA3AHM/OH5HM, and Dieter Kuckelkorn, DL1DBY
When going to an outdoor camping trip, we will find that in many parts of the world there is no cell phone service avail able in the back country. To make matters worse, in these areas there is almost never a VHF/UHF ham radio repeater in range when we need wide-area coverage. Apart from strictly local communications using VHF/UHF simplex radio, how do we send messages to friends and family over great distances? How do we call for help? A similar problem can even arise in an urban environment if a major disaster strikes like the break-down of the power grid.
In activities like back country trips in areas without cell phone coverage or in a widespread emergency with the loss of our normal means of communication we can use satellite phones, but this technology is very expensive, requires subscriptions and there is no guarantee that the complex infrastructure of satellite communications will work under all circumstances. The obvious solution for Ham Radio operators will be to switch to shortwave communication using battery operated radios and often NVIS modes of operation. NVIS stands for Near Vertikal Incidence Skywave, which means transmitting with special antennas straight up to communicate with other stations 30 km to 300 km (20 to 200 miles) away with low power – which would be the most useful communications distance if help is needed. We could use SSB voice communications, but this requires that the person we want to reach is sitting constantly at his or her radio to be able to receive the message. This can be a problem: In a real emergency we probably won’t have time for this. We could instead use capable digital modes with automatic message handling capabilities like JS8Call, but these require notebook computers or other complicated setups in the field which consume a lot of energy and can be difficult to recharge off-
grid on a reliable basis.
Evgeny UA3AHM/OH5HM and Sergej UA9OV have developed another mode of digital shortwave communications, which aims to be easy to use, capable and – most importantly – friendly to the operator’s resources. Apart from a low power battery operated transceiver and a small digital interface, only an Android smartphone is needed, which can be recharged with cheap and readily available consumer-grade solar chargers. Evgeny and Sergej have created an app called “HFpager” which allows to use the smartphone’s sound chip to encode and decode audio signals in the SSB audio passband of the transceiver – similar to PC based modes like FT8 and JS8Call. It uses rates of transmission of 1.46, 5.86, 23.44 and 46.88 Baud. Modulation is 18-tone Incremental Frequency Shift Keying (IFSK) with forward error correcting Reed-Solomon code RS(15,7) and a superblock by 4 RS blocks with interleaving.
I’m not a summer-heat-loving guy. Quite the opposite, in fact. Give me cold weather and I can hike and camp forever.
On Tuesday, July 13, 2021, it wasn’t cold outside, of course, but I still wanted to fit in a park activation and hike. Despite the forecast highs of 90F/32C. I had almost the entire day to play radio, too–a rarity.
When I have an entire day to devote to radio, I can either hit the road and try to hit multiple parks–perhaps as many as 5 or 6–or I can choose to venture further afield and hit a new-to-me park.
I tend to choose the latter and that Tuesday was no exception.
North and north by NW of Winston Salem, NC, are two parks I’ve always wanted to visit: Hanging Rock State Park and Pilot Mountain State Park.
I devised a plan to first visit Hanging Rock, then Pilot Mountain. Both parks are close together geographically, but a good 30 minutes drive apart.
A quick check of the SOTA database and I discovered that there are actually two summits on Hanging Rock State Park’s grounds. One is off the beaten path a bit and would require some light map work, and the other–Moore’s Knob–is on one of the park’s main trails. Since I was putting this whole plan together morning of, I opted for the “easy” summit as I didn’t have time to double-check topo maps, parking areas, etc.
Hanging Rock State Park (K-2735)
Travel time to Hanging Rock was about 1 hour 45 minutes. Once I arrived on site, I discovered that, like many state parks, the main visitor’s center is being renovated.
I easily found the parking area for the Moore’s Knob loop. It being a Tuesday, the parking lot only had a few cars.
Pro tip: with the visitor’s center out of commission, stop by the swimming area pavilion for some proper restrooms/washrooms!
I planned to take the full trail loop in a counter-clockwise direction.
I’m glad I did, too, as the bulk of the ascent was a long series of steps. I’m not a fan of steps, but I much prefer using them heading up a mountain rather than down.
Near the summit, there’s a very short spur trail to Balanced Rock which is worth a visit not only for the rock, but also the views.
It being a North Carolina state park, there are some obligatory warning signs about how falling off of cliffs can lead to injury or death. These warning signs aren’t as prominent as those at Crowders Mountain State Park, though!
Moores Knob (W4C/EP-001)
You can see my MPAS Lite vertical poking out of my pack. I brought it along in case I had no good tree options. In this case, I didn’t use it.
There’s no mistaking the summit as there’s a large observation tower on top that affords some spectacular views of the Blue Ridge Escarpment, the foothills, and Pilot Mountain (my next stop). There were a number of hikers on the summit of Moore’s Knob and it was actually pretty gusty up there, too. I searched and found a nice little spot to set up that was sheltered from the wind, shaded, and even had trees tall enough to hang my Packtenna 9:1 UNUN random wire antenna!
Note: I brought the CHA MPAS Lite in case there were no good tree options on the summit.
Set up was quick and easy on the radio side of things, but as with most SOTA activations, positioning my tripod to make a video was the tricky part. Since I’m sitting on the ground, it can be difficult to find the right angle so that the radio, key, and notepad are all in the frame. (See my video below).
I started calling CQ at 16:00 UTC on 20 meters. I had a reasonable cell phone signal on the summit, so I was able to spot myself. Problem was, though, my hiking app seemed to be draining my iPhone’s battery very rapidly (that and my aging iPhone 7 probably needs a new battery at this point). After spotting myself, I shut down the phone to save power. I forgot to contact my buddy Mike (K8RAT) with a frequency, but he eventually saw me on the SOTA spots.
In a period of 29 minutes, I worked 20 stations on 20 meters.
Next, I moved up to 17 meters where I worked eight more stations in seven minutes.
I love effortless activations like this and part of me wanted to continue operating–even switching to SSB–but looking at the time, I knew I needed to hit the trail, make my way back to the car, and drive to Pilot Mountain.
I called QRT around 16:42 UTC and packed up my gear.
QSO Map
Not bad for 5 watts and a 31′ wire!
One highlight of this activation was meeting Jim (NA4J) who heard my CW from the summit and popped by to introduce himself. Although I trimmed out our conversation in the video (I’m not entirely sure he knew I was recording the activation), you’ll hear him in the first half of the activation.
Video
Here’s my real-time, real-life video of the entire activation:
The hike back to the car was very pleasant. It was a bit longer than the path I took to the summit, but the descent had no steps which made it a breeze.
I had a radio topic on my mind during that hike and actually pulled out the OSMO Action camera and made a bit of a “hike and talk” video. It’s on the topic of ATUs and resonant vs non-resonant antennas. I haven’t yet decided if I’ll post it–the shaky camera might make some viewers sea sick! 🙂 We’ll see–maybe I’ll brave up and post it anyway…
Next, I drove to Pilot Mountain State Park for a quick afternoon activation. Although Pilot Mountain is a SOTA summit, too, it’s yet to be activated because the actual summit would require proper rock climbing, I believe.
Thank you
As always, thank you for reading this field report! And thank you to everyone who has supported me through Patreon and the Coffee Fund. I truly appreciate it.
I hope you find time this week to take your radios outdoors to play, or to hunt some parks and summits from your shack, backyard or vacation spot!
And for those of you working on your CW skills, don’t give up and don’t stress about it. Take your time and allow your brain to absorb code by simply listening. When you feel you’re able to copy even some of the contacts in the videos of my activations, you’re ready to start hunting CW activators!
Ever have one of those days where nothing works out the way you had planned–?
Yeah, me too.
In fact–and this is purely a coincidence–today was one of those days for me!
Here’s how it played out…
A New-To-Me Park
This morning, I had an optometrist appointment in Hendersonville, NC and needed to fit in the appointment on my way to visit my parents for a couple of days. I don’t often venture out to Hendersonville so I looked up a few parks in the area and thought I might fit in a quick activation around lunch.
Keep in mind it’s been nearly two weeks since my last field activation, so this QRPer is having some serious withdrawal.
I looked at the map and realized that Green River State Game Land was a very short detour. I had meant to activate Green River last year and actually located an ideal spot for an activation via the NC WRC maps but never activated it. Since it would be awfully fun to fit in a new-to-me park en route to visit the folks, I mapped out my travels, scheduled the activation via the POTA website and notified my buddies Mike (K8RAT) and Eric (WD8RIF) so they could look for me on the air.
The optometrist appointment went well (thanks for asking) so I made my way to Green River Game Land. I had no problem finding the site–it was basically an open parking area off a rural road.
It was hot, though. My car’s thermometer measured 93F, the humidity wise high, and there were no trees to provide shade. I sat up the Chameleon MPAS Lite, a folding chair, and used the open hatchback of my Subaru as shade from the noon sun. It was *just* enough shade for my chair. I placed the Xiegu X5105 on my clipboard, connected the key, and turned on the radio.
QRM!
The first thing I heard on the radio is the last thing any activator wants to hear. Noise…lots of it.
The radio was tuned to 17 meters and the noise was approaching S9. The noise was raspy and sounded like arching from power lines. I looked at the road behind me where there were several power lines meeting at three different poles.
I checked 20 meters, 30 meters, 40 meters, and 60 meters. The noise was consistently loud across those bands.
I’m certain the noise was coming from a local power pole–it could have been a staple, nail, or something else that was arching.
It was so incredibly hot on site, I had no desire to attempt hiking into the game lands far enough to escape the noise. In my experience, power line/pole noise can propagate vast distances. Plus, again, it was just too hot.
Normally, I’d try to find another game land access point, but having already done a bit of research, I knew going to an alternate spot would be too much of a detour. This was the only access point along my route.
I decided, instead, to pack up my gear, continue my travels, and plot an alternate activation.
South Mountains Game Land
Photo from earlier this year.
I called my buddy Mike, and told him I thought I’d try South Mountains Game Land. In the back of my mind, I had been wanting to visit one portion of South Mountains I activated in the winter this year. I thought, perhaps, it was actually near a SOTA summit on the game lands.
I pulled over at a gas station a good 45 minutes from South Mountains and tried to log into the POTA website to change my scheduled activation (so it wouldn’t spot me at the wrong park via the Reverse Beacon Network). Problem was, before logging me in, Google wanted to initiate a two-factor authentication since I hadn’t logged into the POTA site on my phone in a while. Google wouldn’t send me a text message to confirm, it wanted me to dig a confirmation code out of my Pixel 3 phone that I only use as a video camera and the Pixel 3 was inaccessible.
I had a hunch that I wouldn’t have mobile phone access on site, so I called Mike back and he agreed to correct my spot on the POTA network. (Thanks, Mike!)
Ten minutes from the game lands entrance, I noticed dark clouds had formed to my north. I pulled over and checked my weather app while I had Internet access. Sure enough, a large line of thunderstorms had formed and were heading my way, very slowly. I decided then and there I was not going to do an activation–my phone was already giving me severe thunderstorm warnings–but I thought I might at least explore the site and see if the road would actually lead to a SOTA summit.
Three minutes from the site entrance, the heavens opened. It was a proper gulley washer of a deluge, too–the type that forces you to drive at a snail’s pace and the type that causes flash-flooding. I turned down the game land road and then the lightening started popping too.
I threw in the towel.
Although a part of me would have enjoyed taking the dirt road several miles into the game lands, these rains were the type that wash out dirt roads and I had no intention of dealing with that too. Plus, it would be my luck…right? Right.
Still…
I’m really not that bothered because I actually enjoyed the drive today (save when I hit the storms) and I also found a place in Hendersonville that makes excellent Gyros!
That and I fully intend to do an activation or two tomorrow, weather pending.
We’ll have to see how it plays out. It’s all a part of the field radio fun!
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