Author Archives: Dave
Phased arrays for 40 and 30 Meters
As you can see, even though it would fit, the compromises would be too much for 40 Meters… The radials in the North/South direction would be compromised, to say nothing about being up againset a chain link fence on the south side, and an eight foot metal fence my neighbor to the North put up… So… Change of plans! Continue reading
Review of DX Engineering’s Radial Plate
This review of DX Engineering’s Radial Plate was prompted by the installation of a Four Square array, and a two element 40 Meter vertical array at NK7Z. I decided to evaluate each item in the building of the arrays separably, then review the entire system as a whole later. Years ago I had promised myself I would never spend fifty bucks on a piece of metal with holes in it. After making the decision to build a Four Square for 30 meters, and a two element phased array for 40 meters, I decided to revisit that decision, as I had a lot of ground radials to lay and connect to antenna bases.
My plan was to buy the needed parts for a single monopole, construct it as perfectly as I possibly could, and then duplicate that process for the other five antenna. Part of that process was to buy a radial plate for the ground radial system so I could keep all of the wire under control… I bit the bullet and bought one! I was pleasantly surprised when it arrived, it is so pretty… So perfectly built… So heavy… I actually didn’t feel so bad about spending fifty bucks on a piece of metal with holes in it! Continue reading
Review of Ameritron’s SDC-102 Screwdriver Controller
This review of Ameritron’s SDC-102 Screwdriver Controller was written as a result of perhaps 5 months of use of a new Ameritron SDC-102, in a 2004 Tahoe four wheel drive sports utility vehicle. The Tarheel 100HP antenna is mounted on the stock Tarheel antenna mount, which in turn is mounted to a Tarheel trailer hitch mount, which lives on the rear of the Tahoe in the trailer hitch receiver I am working on a quick weatherproof disconnect for that setup. When finished I’ll add it to the review section, or start a new section on homebrew stuff… Continue reading
Review of LDG AT-1000 PRO II Autotuner
The size of the boxes is very close, with the AT-1000 PRO II being the larger of the two… This caused me a bit of pain as my setup is VERY tight… The PRO II is about 1/4 inch wider… It almost did not fit. I had to remove the carry handle from my Icom IC-756 PRO 3 to get it to fit, and it was tight… I do miss the meter, and the thought of paying $130.00 for an external meter makes me take a deep breath and say… It’s OK… I have not bought the meter yet… I hope the meter takes power from the Icom like the tuner does… See the review for more on this… I will add to this review on the meter if I decide to shell out another $130.00… Continue reading
Review of the LDG AT-1000 Autotuner
I had always wanted an Autotuner, and for the price I could not pass it by. Over the past 4 or 5 years this tuner has performed flawlessly. So far I have connected it to a GAP vertical, an 80 Meter Dipole, a B&W BWD-90 antenna, and a random length wire, about 250 feet long. In all cases it has matched them fine… In fact, it will take my GAP Challenger and match it on 160, a band it was not designed for at all… Continue reading
Radio Noise from Internal/External Sources at Radio Receiving Sites
This document was prepared because of the widespread lack of valid technical
information about site performance at all levels of receiving-site operation. For example,
the information about grounds and grounding available to site personnel was especially
confusing and often downright incorrect.
Complex analytical procedures have been avoided to make the text as readable as
possible, but it is assumed the serious reader will have a good knowledge of the physical
laws related to basic electricity. This includes an understanding of the flow of electricity
in complex circuits, some understanding of the impact of reactive impedance on the flow
of electricity, a basic knowledge of the properties of electric and magnetic fields
surrounding conductors carrying electric current at both low and high frequencies, and
the inductive and capacitive coupling of current and voltage from one conductor to
another.
The basic principles of noise and interference mitigation techniques are also included.
The integrated use of electromagnetic barriers, filters and grounds to confine
electromagnetic noise to its source device is described. This is an effective technique to
mitigate identified sources. Practical mitigation examples are described as well as
ineffective solutions. Continue reading
Review of Icom 2720H VHF/UHF Mobile Transceiver
This review of Icom’s 2720H VHF/UHF mobile transceiver is not going to be a highly technical review, it will be a review on use of the radio, I am a fan of Icom rigs, so there is also a bit of bias in this review… I have owned and used two Icom 2720H’s for several years now, one in each vehicle .. It is a good rig, but it does have it’s faults… One of them being the programming. If you have a computer, all is well, but if you are on the road, and need to change anything, (anything at all), get out your Nifty Mini-Manual for it… You will need it. Continue reading
Review of N6FN’s Nifty Mini-Manuals
Like many aids I suspected that I would not really use them… Turns out I was wrong, the cards are handy to have in the car, as well as the books. I keep the Kenwood card on me when I take out the HT, and the book for the 2720 in the glove box of the car. The fonts look as if they were selected to be readable, and the use of Bold for headings, and non bold for the actual information is well thought out. Major Categories are in Bold Red, while sub categories are in Bold black, while the actual data on how to do something is in normal black text, all on a white background. all in all it looks very much like an index in a book, and is easy to follow. For instance, in the Kenwood card, the section om Memory programming is titled “Memory Programming”, in red, under that are 6 steps, (in blue), each step further broken down into actions, (in black), covering exactly how to program the memories. It sounds complicated, but if you look at it, your eyes just go where they need to… Very well thought out, and very easy to use. Continue reading
Review of the Challenger DX Antenna by GAP
This review of the Challenger DX Antenna by GAP Antenna will not be a highly technical review, it will be performance based. First off what is the GAP Challenger antenna? It is a vertical, which can be ground mounted. It has a limited number of radials, because it is not the traditional vertical, it is a vertical dipole, this gives it several advantages over a standard 1/4 wave vertical. Chiefly the reduced number of radials… Continue reading
MixW Help Files for version 3.x
Here you will find the current MixW help files for inclusion within the MixW software package. These files are in Windows Help Format, .chm. Download the file below, and then expand it, and follow the directions. MixW help files were last updated for V2.19. However the latest version is V3.1 and some of the data in the help files is out of date. These these files have been updated to reflect the changes in V3.1 and other, hopefully useful, information added. Continue reading
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DX-World News:- DX Maps News:
- 29-Jul 0700 New version 3.1 (build 766) of VQLog
- 06-Jul 0800 VE7BQH 50, 144 and 432 MHz antenna charts updated
- 17-May 0730 144 MHz animated sporadic-E maps 2024 available
- 23-Dec 1700 144 MHz EME calendar 2024
- 18-Nov 1200 VE7BQH 50, 144 and 432 MHz antenna charts updated
- 11-Sep 1700 New version 3.1 (build 717) of VQLog
- 09-Apr 1000 New version 3.1 (build 708) of VQLog
- 11-Sep 1700 New version 2.14 of WSJT DX Aggregator
- 09-May 1530 144 MHz animated sporadic-E maps 2023 available
- 06-Feb 1200 VE7BQH 50, 144 and 432 MHz antenna charts updated
