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I’m a fan of using a half-wave antenna on a 2m handheld transceiver (HT). These come in a variety of forms but I’ve tended to use the telescoping half-waves that mount on the HT. These include the Halfwave 2 Meter Flex antenna from Smiley and the MFJ-1714 from MJF. One of the disadvantages of these two antennas is that they are designed for 2m operation only. Put it on a dualband HT and you can only use one of the bands.

Now there is a dualband alternative.

During a discussion of various VHF radios and antennas on the SOTA reflector, Phil/G4OBK recommended this antenna: TWAYRDIO RH 770 SMA-Male Dual Band Telescopic Handheld Antenna. I was mildly skeptical in that the antenna looks like cheap lowcost economy stuff from China. However, for $16.55 (free shipping), it seemed like something I should try out.

I’ve since used this antenna on several SOTA activations and have found it to work quite well. Not having to worry about whether I’m operating on 2m or 70 cm is a big plus. I liked the antenna so much, I now have three.

Recently, I wondered how well the antenna is really performing so I did a side-by-side comparison with the Smiley 2m halfwave. Now this kind of comparison is always a bit dicey unless you have a calibrated antenna range. I got on 2m fm with another ham running a home station some distance away such that I was not pegging his S-meter. We did several A/B comparisons between the Smiley and the RH 770. Much to my surprise, the RH 770 performed significantly better than the Smiley. The other ham saw his meter deflect higher with the RH 770. I can’t give that to you in dB but I can say its a little better. I actually thought that the single-band design might be slightly better due to less complexity in the antenna. The opposite was true. Your mileage may vary. No warranty expressed or implied.

The only thing I don’t like about the RH 770 is that the telescoping sections slide up and down really easy. Too easy for my taste. I’d rather have some stickiness to it so that I am sure it will remain fully extended. But I admit this is more of a personal impression than actual problem.

The antenna is available with a male SMA connector, a female SMA connector or a BNC. That should pretty much cover it.

So thanks Phil/G4OBK for pointing out this antenna. I also highly recommend it.

73, Bob K0NR

The post A Better Antenna for Dualband Handhelds appeared first on The KØNR Radio Site.

I’m sure that you have heard of NPOTA, National Parks On The Air, and SOTA, Summits On The Air, and probably even POTA, Parks On The Air, The US program for the World Wide Flora and Fauna, but have you heard of the latest event that starts on Sunday, Dec 11, 2017?

Starting at 0000 UTC time on December 11, 2017 the new year long event celebrating multiple anniversaries for the NASA program will start. It is called NOTA or NASA On The Air.

With several NASA clubs doing several special event stations of the coming year, they decided to make a year long event where you, as the end user, can contact the stations to earn points through the year. You can even gets points during other events like Winter Field Day, the ARRL Field Day and others.

Losten to my latest podcast episode where I talk with Rob Suggs about it:

http://www.everythinghamradio.com/Podcast/93

Joyce/K0JJW and I had intended to hike Pikes Peak this year for a Summits On The Air (SOTA) activation but somehow the plan never came together. I still had my eye on it as a drive-up activation before the end of 2017. The road to the summit is open year round now but closes frequently due to snowstorms passing through. Saturday morning the road was open to 13 miles (out of 19 miles) with the promise that it would be open to the summit later in the morning. (Call 719 385-7325 for a recorded message on road conditions.) By the time we got to the toll gate around 10 am, the road was open to the summit.

When we reached the summit, the weather conditions were 20 deg F with 20 mph winds, creating a windchill of 4 deg F. We were prepared for that having loaded up on the winter clothing. Still, it was freaking cold up there. As you can see in the webcam picture, there was only traces of snow on the summit.

To be SOTA-compliant, we had all of our gear loaded into our packs and walked some distance away from our vehicle to set up. Because of the wind, we chose the observation platform, tucked in behind one of the walls. Normally, that platform is to be avoided because its overrun with tourists but with the cold weather we only had a few people to contend with.

Joyce set up on 2m fm (146.52) using a handheld transceiver (HT) with a vertical antenna. Even with her headset (foam protection on the microphone), the wind noise on her signal was significant. I started out on 2m fm but quickly moved up to 223.5 MHz and worked a few stations there, then on to 446.0 MHz. I had HTs and small yagi’s on both of those bands. Then I fired up 1.2 GHz with an Alinco HT (just 1W on that band) and a 16-element yagi. I worked Paul/W0RW, Gary/WB5PJB and Wayne/N0POH on that band. My QSO with N0POH in Aurora was a new personal best for distance on 23cm/1.2 GHz, at about 90 km.

I tried 2m SSB using my FT-817 but made only one contact: Jim/WB0GMR. Shortly thereafter, I switched back to 2m fm using the 25W mini-mobile rig with a 3-element yagi to work many more stations. Again, just running a bit of power and having a decent antenna on 2m fm was very effective at making radio contacts. I expected the Tytera radio to be overloaded with signals on the summit of Pikes but it actually held up well with just occasional bursts of interference.

Overall, we made 54 QSOs (not too shabby): 43 QSOs on 2m, 5 QSOs on 70cm and 3 QSOs on both 1.25m and 23cm. Our best DX was Jeff/N0XLF near Akron, CO for a distance of about 130 miles (on 2m and 70cm).

73, Bob K0NR

The post Pikes Peak SOTA (W0C/FR-004) Winter Activation appeared first on The KØNR Radio Site.

Walt/W0CP had recommended this Summits On The Air (SOTA) summit (W0C/SP-076) to me a while ago. Somehow it had escaped my attention, probably because it’s an unnamed peak and not that well known. Joyce/K0JJW and I decided to give it a try today and it turned out great.

We followed Walt’s directions on the SOTA website, using the southern route. We were pleasantly surprised to find a pretty good trail most of the way to the summit. There were a few spots with downed timber, where people have diverted around the logs, but generally the trail was easy to follow. The trail is not shown on many maps, including the USFS San Isabel Forest map. Thus, I was expecting considerable bushwacking to get to the summit.

The route to the trailhead is via FS Road 273, easily accessible from Highway 285 south of Buena Vista and north of Salida. See the San Isabel National Forest map for orientation. The road is narrow in spots. Our Jeep Wrangler fit OK but a wider vehicle would get to deal with the brush on both sides of the road.  The road is easy 4WD and should be passable with a high-clearance 2WD vehicle. The road had some snow on it (Nov 25, 2017) and with a few more snowstorms may not be passable.

The road continues a little further than indicated on our topo map but it is obvious when it ends. After that, the road turns into a nice trail (our route shown on the map above). The trail has a few broad switchbacks that made for easy hiking. When we got near the summit, the trail was covered by many small snow drifts, so we opted to go off trail and just head for the summit. So our last quarter mile or so is probably not optimal for summer hiking. There are several mines at or near the top of the mountain.

We had quite a variety of radios with us, for 2m, 1.25m, 70 cm and 23 cm, FM only. We started on the workhorse band (2m FM) with the 25W Tytera radio and a vertical half-wave antenna. It seems that someone (me) left the 3-element 2m yagi antenna at home. We quickly made contacts with KD0MRC, W0BV, KD0VHD, KE0DMT and KL7GLK on 2m and/or 70 cm. I used my Alinco 222 MHz handheld to work KD0MRC on 223.5 MHz, which is apparently the first 222 MHz SOTA contact in Colorado. (Yeah, not a popular band.)

For the most part, it was pleasant on the summit, about 40 degrees F, but it got cold whenever the wind picked up. Without the wind, it was great. With the wind, kind of cold.

This is a great hike and a great summit. Only a few people have activated it for SOTA, so I wanted to write it up for others to consider. We will definitely return to this one due to it’s excellent combination of easy accessibility, good trail and wonderful views.

73, Bob K0NR

The post Hidden Gem: W0C/SP-076 Unnamed SOTA Summit appeared first on The KØNR Radio Site.

Here’s the SOTA activator scores for Colorado (W0C). I have to admit that I like checking this to see how everyone is doing. Some of it is friendly competition but mostly its enjoying the accomplishments of my fellow SOTA enthusiasts.

We’ve got 10 “Mountain Goats” in Colorado now, with 1000 or more points. Carey, KX0R just never stops activating. It seems like he is out there on a summit every day. My friend Brad WA6MM just made “Mountain Goat,” by activating only Colorado summits, never repeating any, with many difficult climbs. Note that his average points per expedition is 8.65, higher than any of the other MGs. (W0CCA comes close at 8.21) Congratulations, Brad!

The post Colorado (W0C) SOTA Activators appeared first on The KØNR Radio Site.

For years now, I’ve been doing Summits On The Air (SOTA) activations using VHF and higher frequencies. The GO TO band/mode for VHF SOTA is 2-meter FM because of its overall popularity. Just about everyone has a 2m FM radio (well, almost everyone). Still, if you are on a remote peak you may not find anyone within range to work. Because of this, it really helps to optimize the performance of your portable VHF station.

Antennas

I’ve already written that the first step is to upgrade the rubber duck antenna to something that actually radiates. My measurements indicate that a half-wave antenna performs 8 to 10 dB better than your typical rubber duck. That’s a big difference. I tend to favor the collapsible half-wave antennas because they are compact and don’t require any support. Another option is the J-pole or Slim Jim antennas, typically build out of twin lead or ladder line.

The next step up is to use a small yagi antenna, such as the 3-element Arrow antenna. Although Arrow does not specific the gain of this antenna, it has been measured at the Central States VHF Society conference as having ~6 dBd of gain. I’ve been on the lookout for a higher gain antenna but I have not found one that has significantly more gain while still being backpack portable.

Modulation

Frequency Modulation performs very badly when signals are weak. The well-known threshold effect means as the signal level decreases at the receiver it simply crashes into the noise. Linear modes such as CW and SSB work much better when signals are weak, which is why they are popular with the serious VHF crowd. I’ve used my Yaesu FT-817 to make SOTA contacts on both 2m and 70cm SSB and CW. My all time best distance on 2m during a SOTA activation was 229 miles, a QSO with N7KA from Capulin Mountain using CW. However, the problem with SSB/CW is that there are much fewer radio amateurs that operate that mode. I estimate that on a typical day, there are 10 to 100 times more hams on 2m FM than are on 2m SSB/CW.

More Power on FM

I’ve noticed that I sometimes hear stations on 2m FM but they cannot hear me. Further investigation revealed that they were typically running more power than me. I had my little HT putting out 5W and they were running a 50W mobile. That got me thinking about whether I could increase my power while still having a backpack-compatible station. SOTA operation is typically QRP, around 5 or 10 W of power. However, SOTA does not specifically state a required power level…it’s really driven by the need to operate backpack portable. Hence, there are very few 1 KW amplifiers in use on SOTA summits.

Some of the Chinese manufacturers now offer compact dualband (and even quadband) VHF/UHF transceivers that output 10 to 30 watts of RF power. I purchased the Tytera MD-8600 based on my experience with other Tytera products. The radio’s specified output power is 25 watts on 2 meters. The DC power current is rated as 0.2 A on receiver and 4A on transmit, not too bad for battery operation. I paired it with a 13.2V LiFe battery rated at 4300 mAH. In theory, that would provide over an hour of transmit time or 21 hours of receive. That should be plenty for the typical SOTA activation. The size is a slightly larger than 4″ W x 1.5″ H x 5″ D and it weighs about 2 pounds. All in all, this setup is very compatible with the typical backpack portable operation.

Let’s do a little math to understand the difference in transmit signal. The TH-8600 puts out 25W compared to the 5W from FT-60. The difference in dB is 10 log (25/5) = 7 dB. Someone said to me “hey, that’s only a little more than one S unit, which is normally defined as 6 dB. Is that really enough to make a difference?” To which I responded, “yes, 7 dB can make the difference between making the radio contact or not…when signals are near the noise floor of the receiver.” For strong signals, it just doesn’t matter.

I’ve used this configuration on three SOTA activations and I like the results. On two of the activations, I compared the TH-8600 (25W) to the Yaesu FT-60 (5W) that my hiking partner (Joyce/K0JJW) was using. Both radios were connected to 1/2-wave vertical antennas, operating on 2m FM. The radios performed the same on receive, as expected. But the weaker stations we were working had trouble hearing the FT-60. Again: if signals were strong, it didn’t matter but the extra power made the difference when near the noise floor.

I checked out the basic performance of the radio on my test bench and found it to be adequate. The transmit frequency was spot on, the harmonics and spurious on 2m were about 60 dB below the carrier. The receiver sensitivity was about 0.2 microvolts. The RF output power was low, 22.4 W on 2m and 17.7W on 70cm (compared to the specs at 25W and 20W).

I was hoping the receiver performance would be better with regards to rejecting adjacent channel signals and intermodulation. I don’t have a good test bench for that but I can tell you that I noticed some unwanted interference from transmitters that were not close to my location.

How Many dB’s Is That?

So let’s summarize the dB situation.

5W HT with standard rubber duck antenna       0 dB
5W HT with 1/2-wave antenna                  +8 dB
3-element Yagi antenna (Arrow or similar)    +6 dB
25W transceiver (vs 5W output)               +7 dB

Total improvement (25W with yagi vs HT)     +21 dB

Wow, I can improve my signal strength by over 20 dB be making these improvements! I should point out that the antenna improvements help on both transmit and receive, while the increased transmit power only improves your stations transmitted signal.

73, Bob K0NR

The post More Power For VHF SOTA appeared first on The KØNR Radio Site.

I’ve written before about how operating goals can be a good motivator for getting on the air and making ham radio contacts. It is fun to have a goal to work towards and keep checking items off on the list. A few years ago, I decided to apply this approach to Summits On The Air (SOTA). SOTA is ripe for this kind of thing, given its extensive database and tracking of QSOs.

Our family has a cabin in the mountains that we use to hike, jeep, ski, snowshore, explore, escape …  So I decided to make a list of the SOTA summits in the general vicinity of the cabin. I did not use a precise criteria, just listing the summits that seemed close by. I used the Lists Of John web site as a tracking tool. That site is used by hikers/climbers to track their ascents, often working on their own list of summits based on whatever criteria that interests them.

This list turned out to have 26 summits on it and I completed the last one a few months back, which was an unnamed peak (W0C/SP-055). Fifteen of these were the first activations of those summits. Some of these have still not been activated by anyone else (except for Joyce K0JJW, who usually hikes with me).

Now that I have completed that list, I obviously need to create a new one. With all of the SOTA summits available in Colorado, I won’t run out of options any time soon.

73, Bob K0NR

The post Twenty Six SOTA Summits appeared first on The KØNR Radio Site.