If you look at this site, you will see that I have been fighting an RFI problem for years… For the most part I have it beaten down, and it seems to not be coming back… So… That said, I decided to construct a four square array for 40 meters, and a two element 30 Meter phased array, so I could null the remaining RFI, and gain some signal too boot. This also gives me a decent 30 meter Antenna array as well… A four square system is not a small project, you need four verticals, miles of ground wire, a phasing unit, and some land, couple that with a two element 30 Meter phased array and you end up needing something like two miles of ground wire, and five antenna… For the past few decades I have been threatening a 40 Meter phased array, maybe two elements, maybe parasitic, or maybe driven, I never really committed.
I had a failed tower project, and found myself with a slight surplus of money after I sold everything dealing with the tower… The cash I was going to use for the tower, could be redirected to the four square project. So I decided to build a phased array for forty and 30 Meters! As I see it the pros/cons as as follows: Read more »
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!
The photo above, and on the DX Engineering web page does not do the plate justice… It really looks a lot better than the supplied photo from DX Engineering. The surface is smooth, the holes are sharp edged, and perfectly lined up, and in general the construction is a 10 out of 10 for quality. Read more »
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…
I did not want to use a switch which raised and lowered my antenna with no feedback, of any kind– I wanted some repeatability, and to me, repeatability means numbers used for calibration, not just listening to the background noise and peaking it. Although that actually works pretty well, the thought of having to re-tune for each band change, (perhaps while driving), to some unknown position of the antenna seemed at best:
a waste of time
not good for the output stage of the rig
not good for the antenna itself
I have never even used the single switch controller switch, other than to test things out, I went directly to the SDC-102. The SDC-102 is a well constructed metal box, with a mess of cables coming out the bottom of it. It is light weight, and somewhat thin so it mounts up pretty well… See the specs later on in the review for more detail on that. It is easy to read, and I can attest to the fact that it did not run my battery down when left on overnight… The photo on the left does not do justice to the brightness of the display, it is a lot brighter than the photo shows. Read more »
This review of LDG AT-1000 PRO II Autotuner is a follow up review of the AT-1000 PRO II autotuner… I sold my LDG AT-1000, (review here), in order to purchase the AT-1000 PRO II Autotuner.
The price set me back a bit, ($539.00 at HRO), but, based on my previous experience with LDG’s quality, and customer service I went ahead and purchased the 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… Read more »
I picked up a blemish version of this tuner several years ago from LDG. I had an issue recently with the tuner, (after five years of contest use), and LDG did such a good job of customer service I decided to do a review of this device. Actually it was in the works anyway, and their customer service was so good I pushed it up in the queue. So here is the Review of the LDG AT-1000 Autotuner. The tuner information from LDG can be found here. BTW, I have purchased the PRO II tuner, and so far it is running just fine, and a bit faster on tune up… It seems a bit quieter as well, so I will review the PRO II after a few months of operation as well. Read more »
The Mitigation of Radio Noise from Internal/External Sources at Radio Receiving Sites
Radio Noise from Internal/External Sources at Radio Receiving Sites is a set of free E-Books created by the Department of the Navy. I finally located the Internal RFI source suppression link to this public domain document. I looked at the pdf for help in tracking down the RFI at my home QTH. Both of these documents strikes me as one of the nicer pair of items I have seen over the past few years dealing with RFI and how to deal with it. These documents cover all aspects of RFI created within your environment, and external to your environment. The two books are a very good fit for each other. They also cover some basic RFI location techniques. These book starts with a background and general approach chapter, and progresses forward in a clear and easy to read process, showing you how and where to look for RFI. Here is a brief excerpt from the internal sources book. Read more »
This review of the Icom 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.
The rig also has some intermod problems as well… Well, lets be honest, I live in a smaller town, around 150K people, and I get intermod here… The radio is VERY sensitive to anything else in the immediate area as far as intermod is concerned. It also suffers from desense as well… This may not make the 2720H sound like a good radio, but it is… Sort of… You have to get used to the issues above to enjoy it. The rig for all of it’s faults, puts out a respectable amount of power, (oh yes rumor has it there is a final issue with early serial numbered rigs as well), and once programmed is really easy to use, and has two complete receivers in the chassis. The rig will put out 50 Watts, which is pretty good in today’s world. It also has a removable control head, so it mounts up well… Read more »