Tag Archives: ham radio

Bad Behavior on HF Pileup

It’s been awhile since I have seen real big DX pileup. That was the case yesterday afternoon with Annobon Island on 20m SSB. I was not able to make a QSO. The operator was working split and listening up 5 to 20. Most of the stations responding were stateside and while many were well behaved the number of lids and cops on the frequency made it extremely difficult for all operators. I am a strong believer in the DX code of conduct.

The IC-7300 waterfall makes it fairly easy to see where the DX station is listening. When he calls QRZ the waterfall becomes almost solid in a band between 5 to 20 kHz. It dies out when he answers and then the answering station comes out in the spot he was listening. Some monitoring of this will tell you where he is listening to maximize your chances of him hearing the call I hope to see this op again this afternoon as he is only QRV for a few more days.

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Changing Band Conditions

For the past three or four months I was having great success early in the morning with 40m JT-65 contacts to Asia on the 1/4 wave vertical antenna. The band would be great at around 6:45 am and be open till around 8:30 am. Japan especially would be easy to make contacts with on JT-65.

I have been noticing a definite shift in early morning 40m to Asia. First, I should note that JT-65 activity has dropped off quite a bit now that FT-8 is getting so rapidly popular. Just in the last few weeks I have noticed a drastic reduction in the number of JT-65 spots showing on pskreporter. The second observation is that the band seems to open to Asia a bit later now from about  7:30 am to about 8:30 am.

So this morning I started out trying JT-65 and made two contacts to Japan but there were very few signals on the waterfall. FT-8 had much more activity overall. I switched to FT-8 and started calling CQ DX and the first response was from Indonesia. The next 8 QSO’s were from Japan.

Overall, I have mixed felling about this. I enjoy the early morning pace of JT-65. I can check my emails while checking the bands. FT-8 takes quite a bit more work and attention. One other effect is that FT-8 is a bit more difficult to close a weak signal QSO. It is easy for the signals to drop below the noise floor and disappear between transmissions.

More on Soil Meaurements

It is extremely easy to take soil electrical data using the RigExpert by running a frequency sweep. This sweep is saved on the meter and then transferred to the PC and exported as an CSV file. This file contains impedance measurements across the sweep range. Add the formula to convert to conductivity and Er and you get the following graph:

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This data was calculated with a Co = 8 pF adjusted after making a few more measurements. The average values per band are as follows:

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The values above can be compared to those given as standard values in EZNEC. I further compared the gain results when using a 40m 1/4 Wave vertical with four ground mounted radials as follows:

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In this case, the model has a 2.27dB difference in measured gain between the average soil case and the measured reading. In practice, using the “Very Good” values will likely be close enough for modeling work here at the QTH.

 

Measuring Ground Properties at the QTH

Rudy Severns, N6LF, published a paper entitled “Measurement of Soil Electrical Parameters at HF” where he shows several methods of measuring the electrical properties of soil. I built an OWL probe using his directions made from two parallel 1/2″ aluminum rods spaced 4″ apart and 11″ long.

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Once assembled I measured the capacitance of the probe with the L/C capacitance meter which measured it to be 6.16 pF. I inserted the probe in the ground around my vertical antenna then connected the RigExpert AA-230 Zoom and measured impedance at several frequency points in the HF bands. The Resistance and Reactance are used to calculate the soil conductivity and Er values. Here is a graph of the results:

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The data collected at this one point confirms that the soil in South Texas is quite good in terms of conductivity and Er. I will use these values when modeling antennas with EZNEC. This was the initial test and I will likely try some other areas of the backyard and see how much it varies and whether the data is consistent

IC-7300 setting to work with WSJT-X (and others)

I prepared a short how-to on setting up and ICOM-7300 with WSJT-X for working digital modes. If you can get this working, other digital software can be easily configured in a similar fashion. The file can be found on the “Projects” page or from this link:

ICOM 7300 Setup with WSJT-X

20m Hamstick for Balcony Operating

I discussed a 20m vertical using a hamstick for balcony operation. I put this together this afternoon and ran some tests. Here is a view of the antenna attached to a lawn chair about four feet off the ground.


The antenna performed well on receive against the 1/4 wave vertical but WSPR results were not to good. No stations heard my signal even up to 5W. Not sure if the band conditions were a factor. The only contact I made was to Costa Rica on SSB so it’s does work! The stinger was adjusted to 36″ and the SWR was below 2:1 across the band.

More on the 20m Vertical Beam

The vertical beam is definitely directional. Unfortunately, I have no way to measure the gain. What I have noticed is that when I run this antenna on JT-65 I see much stronger reports from the direction the beam is pointed to versus the backside. Same goes with WSPR results. The antenna is also receiving well based on yesterdays WSPR challenge results as well.

I did some A/B switching between the beam and the 20m vertical while running JT-65. The beam sees signals coming in from Europe (very weak just above the noise floor). These disappear entirely when switching in the vertical. This could make a very nice antenna for next field day as it is easy to setup and from my QTH would cover much of the US my pointing due north.

Here is a picture of the antenna deployed in my backyard:

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These pictures show how everything is connected:

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At the feedpoint I have the homebrew 1:1 current balun. Each vertical element has two 18 foot radials laying on the ground. The two radial sets are connected by an 18.7″ ft wire. Pretty simple really.

A 20m Vertical Beam

JP1QEC developed a portable 20m vertical beam he calls the “Garden Beam Antenna“. I built one this afternoon and have it pointed towards Europe. Construction is stratightfoward. I used a fishing pole to first make a 20m 1/4 wave vertical. It has two ground radials that are about 18 feet long. A third radial extends 18.7 feet from the driven element in the direction opposite where you want the main energy to go. This is connected to two more 18 ft radials and the vertical reflector element also mounted on a fishing pole. I ended up with a very flat SWR of 1.6 across the entire 20m band. I suspect that there needs to be some tweaking to optimize the pattern but I am seeing some directionality based on signal reports from making some JT-65 contacts. The beam is pointed on a bearing of about 40°. I get strong reports from stations in the northeast while stations on the west coast are copying my signals considerably weaker. I made several SSB contacts with most reporting 59+. I’ll be testing the configuration in some more depth over the next few days and comparing with EZNEC results.

The Hardware Store 40m Magnetic Loop Antenna

A while back, I wrote up and submitted some info to QST antenna design competition on my 40m Magnetic Loop antenna. The contest is over so I am now publishing the write up on this site on the Projects page. The direct link to the file is here.

The write up details the design and construction of both the 40m Loop antenna and its High Voltage capacitor made from Copper tubing. Nearly the entire antenna can be made from parts gathered at your local building supply store. Hope some of you find this Useful!

Operating During Current Increased Solar Activity

I just wanted to document some observations I made during the current solar activity. Solar flux index was in the 120 range today with the sunspot number around 79. A CME slammed into the Earth’s atmosphere around 23:00 Zulu generated by an X class solar flare day before yesterday. The K index jumped to 8 indicated a major geomagnetic storm/blackout.

There was quite of bit of activity here. I made an SSB contact with a ZL station who was a strong 59 on 20m. Also made a strong 59 with an HI station. I heard ZS3D very clearly tonight on 40m but he did not copy my signal. 20m was open well after dark. So even with disturbance in the geomagnetic field, communications across several bands was open to DX.

Update 9/8/2017: 40m band was wiped out locally early this morning. No DX to Asia and few stations showing up on JT-65. Noise did not appear to be loud but very broadbanded and deep. Now at 16:45 Zulu the K index is at 8 indicating a severe storm. SFI is at 123 and the SSN is at 94. 80m and 40m is completely dead now. Some light traffic on 20m. 17m and above are dead now.