Monthly Archives: October 2017

DX100 Award!!!

I achieved the QRZ.com DX100 award today thanks to an early morning JT-65 contact with DV1FZE in the Philippines. As of today I have logged a total of 2878 QSO’s and confirmed 100 countries using QRZ electronic logging only. I am now working to close the ARRL DXCC award and need only 5 more entities via LoTW contacts.

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Working the CQ WW SSB Contest on the ICOM 7300

I was on a short business trip to China last week and arrived back home late Friday night after the CQ WW SSB contest had already begun. I started working the contest after lunch on Saturday using the Icom 7300 on 100W and with the N1MM logging program. I took a little time before starting to enable the spectrum display feature on the logging software as well as the spotting capability. This was fairly straightforward and only required that I change the baud rate on the rig. How did this all work? Well all I can say is I wished I had this in earlier contests! Here is a view of my contest screen:

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Spots match up with the spectrum display and a simple click on the signal of interest adjusts the rig. There are screens that display the spots that will maximize my score which is really handy. I operated search and pounce on 10m, 15m, 20m and 40m bands. Here is a summary of my score:

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Action on the daytime bands was centered on 15m. There was some intermittent activity on 10m during daytime hours. 20m was very active but also seemed difficult for me to make contacts. Not sure if this was related to the antenna or propagation conditions. 40m at night was also quite active with very decent DX. Overall a good cross section of DX with 63 DX entities contacted over 35 CQ zones.

Lots of fun with this and a good test of the vertical antenna system.

 

630m WSPR

Cliff, N5CEY, has been listening to 630m WSPR stations over the past few days and has been consistently picking up three or four stations a night with his antenna system. I thought I would try the same using just the mini-whip antenna and the SDRplay receiver. The mini-whip has been fairly decent on the lower bands. I cranked up HDSDR and when I tuned to the WSPR frequency of 474.2 kHz and found a huge amount of inter-modulation products from local broadcast stations. I tried lowering the gain but they didn’t go away. Looks like I will need a low pass filter or an attenuator.

I then switched to using the SDRuno software that goes along with the SDRplay. It has some filtering features that I thought would be useful to try. The waterfall looked a lot quieter with this software for some reason and after piping the output to WSJT-X I was able to decode 630m WSPR spots from three stations overnight. This compares favorable to what N5CEY saw over the same period.

I will be playing with this some more to see if I can further optimize the receive.

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.

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.

Practical Application of Soil Measurement Data

Anyone interested in ground radials, ground mounted verticals and even elevated radial verticals should visit Larry Severns, N6LF, website. he has done extenstive research om the subject and has published his results in QST and QEX with many of these articles available on the website. His article ” Experimental Determination of Ground System Performance for HF Verticals Part 4 How Many Radials Does My Vertical Really Need?” was originally published in QEX May/June 2009 edition. The following graph was taked from this paper:

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This graph shows the change of signal improvement on a 1/4 wave vertical with 1/4 wave ground radials under different ground conditions. The impact of this graph is that when the ground is “good”, adding more radials results in small signal improvement vs when using a “poor” ground. I can expect a .2dB improvement if I double my radials from 8 to 16. If I double again to 32 radials my signal improvement would be only around .5dB.

There is a real economic benefit to having good soil as in general fewer radials are needed because the ground losses are less than when over poor soil.

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