Eagles nest activation

Here it is, out in the rocks and weeds. This…this is a POTA activation. Take your radio out into the park, string up an antenna and connect a battery. See who is on the air and make some contacts. Today I decided to simply use CW and use my Ten Tec Argonaut 5 with a speaker wire antenna and my little MFJ 941 antenna tuner.

The kit also includes my N3ZN CW key and my Hamgadgets Picokeyer. These make the Argonaut one of my favorite POTA radios and for good reason, it is a perfect kit. I also have made up a cable that my keyer can connect to the microphone jack on the front of the radio, this is a lot easier than the tiny little port on the back of the radio.

I got the antenna strung up, with my throw-line kit, over the tree next to me as the tuner has the random wire connectors on the back of it. The wire was about 25” long and the two radials were some random length about 15’ or so and it tuned up on 20 meters just fine. It had enough bandwidth that I didn’t need to touch it after the initial tune with the nanoVNA.

I connected the nanoVNA and was able to tune the system fairly quickly without too much fuss. What I like about use the VNA in this application is that the transmitted signal is minimal and I can adjust what part of the spectrum I am looking at so I can find the resonant point and then make adjustments from there and walk it into band easily and visually. As I get closer to where I want it, I simply reconfigure the amount of bandwidth I am looking at and narrow it in. This is only needed if I am using something like this random wire that I have no idea where to start with for it. If it is a resonant antenna, then is is much simpler. Now, to be fair, the old method of keying on empty band space and tuning based on the SWR meter still works fine, but not all of my field radios have SWR meters on them so it is kinda tough to use from time to time like that. This method eliminates the need for a radio with a meter since it IS a meter and can see way more than the simple SWR value. I am once again going to recommend you pick up a nanoVNA and learn a couple of uses for it. Once you do, you will never go back to regular antenna analyzers (which are simple VNA circuits if I had to guess). On top of all that, they are crazy cheap these days too…it is hard to beat in my book.

The N3ZN CW Paddle (This is his little travel paddle with a base plate) and the Picokeyer are a match made in POTA heaven and are now a permanent part of my “POTA Shack” that I travel around with all the time. I take this little key and keyer with me everywhere just in case I have time to activate a park. You know, just in case…lol.

There are two things I really like about the Argonaut 5 in particular. One is that you can key the radio from the front as well as the back for CW. They list the PTT switch as a key input for CW, this is a straight key input only but it is a way to key the radio none the less. I have made up a cable that plugs into my Picokeyer so that I don’t have to use the tiny port on the back that is right next to the heat sink. I also have a RF choke on the line to help prevent stray RF from getting into the radio as well. This does seem to help to be honest about it.If the coax is near this cable it will key the transmitter and add unwanted characters to the CW without the choke inline. That is how I know it works…

The other thing is that the multi-function knob shown above does two jobs at once. So you use one knob to control two different things. The RIT and the Filter Bandwidth are both controlled from here. I normally leave it on RIT once I set the filter to what I want to listen to…usually 500 to 700hz if the band is quiet and 300 to 400 if it is crowded. Notice how well the buttons and knob are organized and even the information that they are displaying is located well, it is literally right above the control so it is in one cohesive place. This is superior engineering in my opinion and is a dying art…

In the photo below I am pointing at the truck where I normally setup to do POTA. That tiny, little, one car parking lot is a great spot if you are in a time crunch and want to play radio for a little bit, but it is really noisy with cars passing by and occasionally one of them is emitting RF noise to boot. This is the reason why I trekked all the gear 200 yards to this shady spot and setup with a battery instead today.

As you can see from the log above, the bands were strange today. At one point I have AE1ZR just vanish and never return… As you can see, I spent several minutes trying to raise him to complete the exchange and he just never returned to my receiver. Several stations took more than one try to get the data through at this time frame actually and I noted it in the log. But when it was open, I was able to work several Canadians as well as Minnesota. Not a bad day in the field with a random piece of speaker wire and a few watts of RF energy…

73

WK4ds

Little Manatee River State Park K-1898

I had some time today and wanted to get out of the city here in Tampa so I went to Little Manatee River State Park and setup a quick little activation on 15 meters.

This park is really nice and well cared for. It has many hiking trails as well as a creek on one side that you can canoe in…just dont pet the alligators and you will be fine there, but they do have an equestrian area as well. Plenty to do if you want to do something other than park activations for some reason…lol

Today saw me setup on the bed cover agian as it was nice out and I was mostly in the shade so I knew I wouldnt get too hot. I ran CW only as I didn’t feel like messing with the sBitx V3 to work FT8 as I really only had about 30 minutes of operating time and for me, the FT8 contacts come in a little slower than the CW contacts. I did choose 15 meters though which was a little bit of a gamble, but it worked out once I got on the air and tuned around the band a little and found it was active, I rested a little easier.

I ran the Ten Tec Argonaut 5 transceiver today with the N3ZN key and Hamgadgets memory keyer. This radio is a joy to use for CW and I really enjoy using it for park activations. It has about 20 watts full output, but today I was only running 15 watts as I normally don’t push the old transistors as hard as when they are new… probably don’t matter, but in my mind it makes sense. When I am operating, I use 3 things, well 4 if you count the AF gain (volume). I use the multi-function knob to control the BW (band width of the filter) and the RIT control. The same knob does both jobs, you just hit which ever button you need first then set that function to what you want. The display is currently showing the BW setting of 600 Hz. I will open it up if the band is quiet, but this thing is pretty selective and will allow me to go down to 250 or 300 Hz if I need it and works really well.

Today also saw the use of zero radials. I wanted to see what the SWR would be without anything since these antennae are designed to be used without a counterpoise and just work off the coax shield and car body. I was pleasantly surprised when the nanoVNA showed 1.3 to 1 right out of the chute! Seems my antenna for the band is tuned a little low like this. If I add the 20 meter radials it balances better and move the frequency up closer to where I operate and gets that super deep null right on me.

I did experiment a little with how I laid out the coax to see what it would do and the result was minimal to say anything. I think I changed the reading by .01 SWR from start to finish. Totally not worth the extra effort to optimize the coax… The photo below shows me pointing at the best setup I found and the screen of the VNA showing my target frequency on a 4Mhz slice of spectrum.

I had problems with RF in my keyline. I am guessing due to the proximity of my key and keyer to the antenna. With electronic keying, rf can trigger the keying circuit adding unwanted dots and dashes to your code. I solved this by adding rf chokes to literally everything. If you will notice they are on the key cable as well as the keyer to radio cable and I still have that huge one on the coax as well. I have not added them to the power cables yet but might to see if it will help.

At the end of the day, all POTA is good POTA and I had a wonderful time working a ton of stations. The Ten Tec Argonaut 5 is a great little radio and I count my blessing for being able to land one for reasonable money. If you are a CW guy, then I suggest you try some of the Ten Tec radios as they are simply sublime machines for this mody. I quickly became an addict of their radios and will continue to be for many years to come. Thanks and I hope you get on the air and have some fun soon!

73 - WK4DS

A POTA activation that was incredibly rewarding!!!

When we activate a park we never know what is going to happen.

So today is Labor day here in the USA. This is the first Monday in September set aside for the workers of this country to grill out with their buddies and such as that. So for me that means going out and setting up a POTA activation somewhere. I decided on Cloudland Canyon after deciding that the drive time to other parks would make the activation very short for me and I wanted more time on the air instead. I choose the upper parking lot since I wanted to use my hamstick system instead of rigging to the trees today. The trees I normally use have a lot of traffic today from hikers and I didn’t want them tripping over antenna wires all day so this just made sense. As you can see below, there was plenty of room for me here today…

I don’t know if I have shared this or not, but I have converted all of my hamsticks to this QD system so band changes are fast. It works really well, I do need to retune my antennas though as this did lengthen them a little and now they are all low on the meter for their center frequency… always something to do…lol.

Once installed, these mounts work really well and the tune is very stable, I have not seen it change at all from the numbers on the VNA since adding these QD adapters. So if you think you might want to use hamsticks for POTA, I really like them. Now to be honest, I don’t think I would use them for mobile (in motion on the roadway) use as there is a lot of leverage on this little mount and the spring is not that heavy to me, they might work fine like that and probably have been deployed that way, but for me, this is a site setup tool only.

Another reason for the hamstick setup is the use of the truck for shade during the activation. By strategic positioning of the truck I can leave the doors open with the engine off and not have RFI from the operating parts of the truck to contend with as well as having a natural shade from the sun too. I use this trick a lot when I don’t have a ton of time for an activation and want to operate in inclement weather like rain. Simple and robust, plus the system just works, look at the logbook below and tell me how hamsticks don’t work…

I carry all of the stuff in the photo below in the hard-shell case that I keep the Ten Tec Argonaut 5 in so I don’t have to search for cables or things like my key. It is all in there and I just grab the case and go. This makes life so much simpler for me. Seen in the photo is the Ham-gadgets Pico Keyer and the N3ZN tiny CW key I picked up at the Huntsville Hamfest. Once I get all the parts out of the case I close it up and use it in the passenger seat for the hard surface to place the radio on so it is out of the way while I use the center armrest for logging and sending CW.

Here you can see how simple the connection scheme is when running Hamstick antennas, there is no tuner or interconnecting cables, just the RF choke to the coax, the power cable (I plugged into the truck’s cigarette lighter port today) and the CW key cable and nothing else is needed. Simple is king here and it also makes setup fast. That is another reason I like using CW instead of other digital modes with this radio as well as my other radios to this point. They all need a computer and a sound card to get them to do digital modes (other than CW) and I normally don’t have a ton of time for all that setup and getting it going. CW is on the air really fast, like SSB. You can also see the silent fan mod I did a while back (there is a blog post showing what I did) and I really like this mod as it eliminated the fan noise entirely. I need to make a screen to protect the fan though, that is still a project to be done…

You have seen this view shown below in the past, but I included it today since I got the moon in the photo too… lol. I do like the system I have built for activating a park with a hamstick, it is really fast to deploy and when I do a rove, I simply coil up the counterpoise wires and lay them in the truck bed. pull off the radiator from the QD base and lay it in the bed of the truck too, unplug the coax and coil up the portion to get it inside the truck and I am off to the next park. The antenna mount can ride in the receiver hitch easily enough so it is not an issue. This sounds like a lot but it literally happens in two minutes tops and I am driving to the next park.

Another thing I did today was hook up the inline power meter. Now I don’t remember why it only shows 8.9 watts of output. I had the radio set to 15 watts forward power so I probably took the photo after I let off of the key as the amp hour meter doesn’t clear till you disconnect it from power. I don’t remember if I had it in tune mode or if I was simply sending dashes. But what I was looking for was the total amp hours of use, this tells me if my little 8A/h battery would hold up to a heavy activation. From this meter reading it will. Now remember, this is with the radio set to 15 watts too, so under a normal activation of 5 to 8 watts, this would last for many hours. Today I went for two hours and got 70 contacts in the log and only used 3.68A/h and that makes me much more confident in using the smaller battery for activations now. I had my concerns before but now I don’t. Another point here is that I normally try to add something else to the activation that has to do with information gathering so I also learn something that I didn’t know before, today it was the amp hour info.

So I get to the park and take my time and listen to the bands a few minutes once the rig is installed and decide to start on 40 meters as the noise level was really low today. I get on the air at 13:25 UTC (9:25 local time) and start calling CQ… It didn’t take long to secure the activation and I had not left 40 meters! I don’t get on the lower bands too often as I am not at the park at night when the bands are less noisy so I don’t get the hams in the closer states like Tennessee or Georgia, it was really nice to get some of those states in the log for a change. Hanging out on 15 and 17 meters nets much more distant stations so I have to remember to come back to 40 every once in a while…

I then move to 30 meters for a little while to see what I could do there and work several more people on 30 meters in about ten minutes of operating. 30 meters at this park is a crap shoot to be honest, some days it is quiet and some days it has this intermittent computer noise that just shuts the band down, today the noise was nowhere to be found to my delight!

Then…I…got…on…twenty…

First off, who doesn’t work Bill (K4NYM) if he is booming in to your station and for a Park to Park no less? So I hunted him before setting up on frequency. It took one try, he is an amazing operator and I aspire to operate as efficiently as him some day.

Things take off once I park on a frequency and start calling CQ. I promptly work a page and a half of calls then I get the one you see below. Not one to brush off anyone calling me, I take the time to have a nice QSO with him as he is working on getting on the air with CW and is having to do head copy only…I later learn… So I take the time to write down what he is sending so I can read it and respond when it is my turn. Turns out he is just now getting back active in CW after taking a long hiatus from it and also, he cant see, hence the head copy only. Talk about a person with conviction, he never gave up. I was so glad Justin called me and feel honored he felt confident in me enough to throw his call into the fray of POTA not knowing what would happen. That took guts.

Once we finished our QSO it was back to the POTA game in full swing. I struggled with one thing today more than anything else… stations zero beating me. It never fails, I get two or three stations that due to modern technology, will zero beat me perfectly. This in itself isn’t a problem and is really the most efficient QSO to have in CW, but what happens is that those two or three stations melt together into the one single tone and it is unintelligible. So If I don’t pull you out on the first try, move up or down 30 to 40 hertz, This will make you off frequency enough to sound different and you wont blend with the other stations and I will get you on the first try, this is an old contesting trick and by golly it works, I will have one station that stands out and is clearly definable and the rest is this one huge tone. I never really understood it till I was an activator trying to pull one call out of the mayhem, then I got it. Now when I hunt I leave my XIT or Transmit Incremental Tuning on and set 40 hz high just for this reason.

Once I hit 70 QSOs today I had been on the air for two straight hours so I went QRT and shut down the radio. It was a great activation and I really enjoyed working with a new (relatively speaking) ham on building his CW skills back up to what they were. So till next time get your radio out!!!

72

WK4DS - David