Thinking About a New Radio

I'm always looking at the new radios that hit the market. Right now my eyes are on a radio that may not even hit the U.S. market for a year or so, and when it does, I may not even be able to afford it. That radio is the Icom IC-7600 that I briefly mentioned in a recent post. The speculation is that the 7600 will build upon the IC-756 PRO series of radios, but also borrow technology/features from the IC-7700/7800 series. If the speculation promises to be true, it should be a great radio.

My main radio currently is the Kenwood TS-2000X, with the Yaesu FT-897D as my secondary radio. The 897D is a great radio and I've made some DX contacts. I've added the LDG FT-897 autotuner, and the SSB and CW filters from W4RT. It's just that I've noticed when operating the digital modes on the TS-2000X that good IF filtering comes in handy. It's nice to be able to narrow the passband to remove offended signals, and particularly to keep them from driving the AGC. The narrowest IF filter that I have on the 897D is the 500Hz CW filter, and there is some IF shift that you can perform on that radio. Any tighter filtering is done with the DSP circuitry in the AF stage. The AF stage is past the AGC circuit. If you play with a digital mode program such as MixW for a while, you will notice that it will properly decode any one signal that you put the cursor on. As long as all signals are of equal strength you can actually have the passband wide open. So it really boils down to the effects of the AGC circuit and the AGC circuit will act on anything that makes it past the IF filtering. Rarely are signals of equal strength so the AGC will act on the strong signals and drive the remaining signals into the noise. If you can just filter them out at the IF stage, the AGC can't act on them and drive the desired (albeit weaker) signal into the noise.

So one of my main reasons to look for a new radio is to acquire one that has good IF filtering but is also portable. The radio that I am looking at is the Icom IC-7000. It has many features, including the IF-DSP filtering, but is somewhat smaller than the 897D. It is more expensive than the 897D and I will need to add an autotuner (my newly acquired Palstar AT2K is not really portable). LDG sells the AT-7000 specifically for that radio. I will also need Heil cables for my microphone and Proset Plus, and a CI-V interface for the computer control.

If I end up buying the IC-7000, I will likely sell the 897D and everything specific to it.

73

My Station Equipment

I figured it was time that I talk about my station equipment. In this post, I will mainly talk about my base station equipment. In some future post, perhaps I will talk about my two HTs.


In this first photo, I have pictured my two VHF/UHF mobile radios that are currently serving duty as base stations. In the photo, you can see two mobile radio main units as well as two control heads. The main unit on the bottom is for my Icom IC-2820H and the main unit sitting on top of it is the Kenwood TM-D710A. As far as the control heads go, the 2820's head is in the foreground and has the green backlighting. The D710 control head is in back. Of course, the main reason for having the D710 is for its APRS capabilities, and my main reason for having the 2820 is for its D-Star features. These radios may never get installed in my car, but I would like to make up a box that these two radios can be mounted in and then quickly connected to the car battery and a mag mount antenna. In this photo, you can also see my Bencher iambic paddle. I barely know the Morse Code, but I have this paddle so that others can use it, particularly during Field Day.




In the photo below, you can see both of my current HF rigs, a pair of wattmeters, a pair of speakers, and a pair of radio interfaces. The larger radio is the Kenwood TS-2000X. This radio covers 160 - 6-meters, 2-meters, 70-cm, and 23-cm, but it does not cover the 60-meter channels. It has IF-DSP capabilities, satellite operating feaures, and a built-in TNC. The radio sitting on top of the Kenwood TS-2000X is the Yaesu FT-897D. The 897 has the LDG Electronics AT-897 autotuner attached. On top of the 897D are two Tigertronics SignaLink USB units. The one is the rear is connected to the Kenwood TS-2000X and has seen quite a bit of use lately. The one in the foreground is new and is connected to the 897D. I have not had a chance to tweak its settings yet. To the right of the TS-2000X, you will see a pair of speakers. The Kenwood SP-23 is sitting next to the TS-2000X, and a Vertex speaker (the MLS-100, I believe) is to the right of the Kenwood speaker. I've added both of the speakers fairly recently as I prefer their forward-firing sound better than the top-firing sound of the transceiver's speakers. On top of the Kenwood speaker, you will see the Powermaster wattmeter. That is the main display for the wattmeter. The Powermaster also has the HF coupler that samples the RF energy. It is shown in another picture. The LDG Electronics FT-Meter sits atop the Powermaster meter. As its name implies, it is connected to the FT-897D. I must say that it is nicer to read this meter than the 897's built-in one.




The next photo simply shows my sealed lead-acid battery in its battery box. Sealed lead-acid batteries are safe for use indoors as the hydrogen levels during charging are never high enough to be dangerous.




This photo shows a number of station accessories. The large black box on the floor is my Astron linear power supply. I believe that it can supply 35 amps continuous. There are two things sitting on top of it. You can see the Palstar DL2K dummy load with its backlit analog power meter. Sitting to the right of the DL2K, is a Bencher low pass filter. It's designed to not pass anything above HF frequencies, hopefully ensuring that I do not cause any unnecessary interference. I will have to remember to bypass it, if I want to operate 6-meters, though. By the way, neither of this two accessories block the ventilation on the power supply. The gold-colored box on top of the DL2K is the HF coupler for the Powermaster meter. Sitting on the floor next to the power supply are first, the Rigrunner 4008, and second, the Super PWRgate (both are products of West Mountain Radio). The green object with the small LCD display, is a meter that simultaneously measures voltage, current, DC power, and several other parameters. The sealed lead-acid battery and the Astron power supply simultaneously feed the Super PWRgate. The Astron normally runs the station, and it trickle charges the battery. If commercial power fails, the Super PWRgate allows the battery to immediately take over. The DC meter (the green thing) samples the output of the Super PWRgate immediately before it goes to the Rigrunner for DC power distribution to the other station gear.




Some of the things that I haven't pictured are my Palstar ZM-30 antenna analyzer (perhaps a future post), my HTs as mentioned before, antennas, my computer, Heil Sound Proset Plus boomset, Heil Sound Goldline GM-4 microphone (was free with the TS-2000X), and a Palstar DL1500 dummy load. I'm hoping to add the Palstar AT2K manual tuner to my station in a couple of weeks. I'll probably be talking about that, too.

73

2008 Field Day

The annual amateur radio Field Day event is now over until next June. I had a lot of fun this year, and, of course, that is what Field Day is all about. Having watched the weather reports in the days leading up to this past weekend, I knew that it was not going to be pleasant the whole weekend. Also when I first showed up, it seemed that there was going to be a real issue with my station getting on the air. It seems that this year something happened to the first set of deep-cycle batteries that we were going to use. Most people simply decided to rely on generator power and use a power supply. I didn't pack a power supply. Fortunately, a second smaller set of batteries was brought out and my station ran fine the whole weekend. I set up my Buddipole antenna. One station was already running 20-meter PSK, so I configured my station for 20-meter phone. I used the station quite a bit and also gave other people a chance to use my radio, which, by the way was a Yaesu FT-897D. My radio was used on 20, 15, and 10 meters. I was really surprised on Sunday morning to notice that 10-meters was open. I did not expect it to be considering the level of the solar flux. I personally probably made about 70 contacts on my radio on the three different bands. Of course, numbers like that will not win awards, but I did have fun. Other people used their radios on 80-meters and 40-meters. While I used the search-and-pounce technique, some of the other people found a frequency and stayed put and called CQ. That method seemed to be more productive for them. I also spent the weekend taking photos and shooting video of the Field Day event, and I spent time just watching other people operate their radios, or listening to the stories that people told. This year, I did try out some relatively new equipment. The radio itself is less than a year old. I almost exclusively used my Heil Proset Plus boomset with the handswitch. That worked out great. Sunday morning I tried to copy the ARRL Bulletin. At first I tried to copy it on 15-meters, but then I found it was much easier to copy on 17-meters. It was easier to copy in the sense that there was less QRM (because 17-meters is not used for the Field Day contest), but the bulletin is read fairly quickly. So next year, I will be packing at least two extra things: a power supply, and a digital recorder. Another thing that I noticed at this year's Field Day, that I've noticed before but not recently, is the interference between radios. I was operating 15-meters while another station was operating 40-meters. Every time that they would key up to call CQ, it severely distorted my received audio. That was probably the third harmonic, or simply front-end overload from the main transmission. I think that I am going to pick up a set of bandpass filters between now and next year's Field Day. That pretty much sums up the Field Day that I attended: WC8OH, West Central Ohio Amateur Radio Association, 3A, OH. 73, N8OIF