Performance Test Of The DX 2547This is the first base station in the line of Galaxy CB radios. In these days of converted 10-meter radios, companies like Cobra, Midland and Uniden seem to be trimming their CB radio lines. Cobra with the elimination of their base station radios. Midland back in the hay days was one of the first manufacturers with a line of true single sideband radios now with only one mobile in their SSB line-up. Uniden earlier dropped the PC122, a low cost AM/SSB mobile. More recently they have eliminated the rest of the SSB line with the removal of the Grant mobile and the Washington base. The only other SSB brand with an AM/SSB base station CB radio is Texas Ranger. Cherokee has a base radios on their web site, but they aren’t to be found in the real world.With all the manufacturers moving away from base station and SSB CB radios, it was a surprise to me when I learned of the new Galaxy DX 2547 CB base radio. It sure made me wonder what might be so special about this radio that would make sell in the current marketplace. Will it be the replacement for the Uniden Washington or the Cobra 2000 GTL? Or is it somewhere in between? These are the reasons for picking this radio as cover story of the first web edition of CB World Informer.The radio is made for Galaxy, to Galaxy specifications by RCI. The photos on the Galaxy site and the photos on the box, although very professionally done, don’t do the radio justice. I wasn’t able to capture the true appearance of the radio face with my camera either. I tried many lighting sources and camera settings. The radio just looks so much better in person. A customer came into the store and said “I saw the new Galaxy base on the web, I wasn’t impressed.” I then showed them the radio and they immediately said “I like that, it’s a nice looking radio.” I’ll do my best to describe the face of the radio. The face color is a metallic platinum color with charcoal gray accents and knobs. The indicator area is black giving a high contrast for the LED and meter display. The face has black lettering on the platinum background while there is white lettering on the charcoal and black backgrounds. It is much more impressive to view the real radio.Looks may be very important, but the performance and functionality is paramount. The DX 2547 has all the features of the past top of the line CB base radios of the recent past and then some. Little things like front legs that flip down tilting the radio for better viewing don’t add to the cost of the radio but make a difference in making it user friendly. Sometimes it’s simple well thought out features like this that make a radio stand out from the competition.Below is a picture of the radio with all the listed control and indicator functions so you can familiarize your self with the radio. Click on picture for close-up view. Below are a list of controls and indicators with comments about each of them
Now for the performance test of the DX 2547. First, this radio came from a distributor and no one Knew this was going to be tested and reviewed by CB World Informer. There is no reason to expect any radio to perform differently from this on tested, although this one has a quirk in the ANL function which is covered above. I've submitted and E-mail to Galaxy tech support about this and will add their response as soon as it's received.UPDATE:Galaxy returned my E-mail and confirmed the problem by checking some older and newer DX 2547 radios. The problem is that the J6 connector on the main circuit board is reverse on my radio and others at their site. It's unclear how many radios are involved, but the solution is simple. Unsolder the three pin J6 connector from the main circuit board then rotate it 180 degrees and re-solder it.Checking the frequency stability from cold to warm, I found it took about 15 minutes for the radio to warm up and it settled down close to center slot after changing about 250Hz . This may vary from radio to radio, but I would expect it to be close. The frequency from the factory was within 100Hz of center slot and the counter alignment was on the money.As far as transmitter performance, both AM and SSB audio are very high quality. The stock mic is adequate, but it sounded better with an EC-2018 turbo echo mic from RF Limited with or without echo. It will sound great with an Astatic amplified mic, especially a D104 type base mic. Out of the box the AM modulation peaks around 50% and the power readings are listed below.
Testing the receiver with the signal generator, the radio seemed to meet the specifications. It performed as well as or better than most radios on the market. The sensitivity is very good and adjacent channel rejection is also impressive. But the true test is on the air with peaked and over modulated radios in close proximity. Being located in the middle of a wholesale produce market, there are hundreds of over the road drivers running power delivering in the area and in the building that my shop is located in. This is one of the best test beds for receiver performance.With the radio connected to a Solarcon I-Max 2000, I scanned around listening for familiar voices. After monitoring AM for a couple of hours, I found the receiver to be quite sensitive and exceptionally clear. With the tone control set at mid-way the audio frequency response was the best I've heard from solid state equipment. Transmissions from the regular operators I'm used to hearing sounded fuller with just enough bass response.The sideband receiver was equally clear. The radio has a natural sound on sideband that's easy to listen to. Tuning into a station is easy with this clarifier. Turning the clarifier off worked well on most signals and I think this feature may convert some operators to sideband. In time with more frequency stable radios on the market, the need to constantly tune in stations may be a thing of the past eliminating the most common reason people won't use sideband.Testing the squelch, I found it very smooth cutting in and out. There was no pop or click as signals came in breaking the squelch. It also worked very well on sideband. I'm not a squelch user myself because most of them are erratic and at times choppy. I find more often than not, calls get missed or parts of conversations are cut out because the squelch can't be properly set. This one works pretty well. It's one worth giving a try.On air transmission reports were very good. The audio was clear on both modes and at all power settings. The modulation wasn't super compressed at the lowest power settings as it is on some radios.The auto calibrating SWR meter is very convenient, no more keying up at either end of the band and calibrating the meter before you get your reading. Just go to the channel, key up and there it is.During the on air tests I didn't encounter any interference that impeded communication. There was slight interference from stations within a quarter mile the next channel over, but I would expect this from any other radio and far worse on most.The Galaxy filter did reduce the noise level at the audio end. You won't see a reduction in S meter reading but it smoothes the audio out reducing harsh spikes from reaching the audio amplifier. There is a cost to this. Weak signals become difficult to understand with the high frequency removed from the audio signal. This filter cuts the high frequency out so well, the tone control has almost no effect on the audio. Many signals seem muffled, but under extreme noise conditions, this may be worth getting use to.Galaxy DX 2547 Specifications