![]() ![]() However, in my opinion, the BT1500A cannot be beat. I usually don't suggest what other folks should get because any problems they have becomes my problem in a sense. The BT1500A has shown that it is able to do that in my case. The only thing a transmatch can do is match the rig to the antenna. "Any station is only as good as the basic antenna in use". There is an old saying about these things. It is a bit "pricy" but worth the money if you want the best. I must say that the set-up I am using now is the best all around one I have had in the last 48 years or so on the air.Ī balanced tuner is necessary to use this antenna on all bands and the BT1500A covers them all. I am using a twin delta setup with a a 132 foot loop on each side. I bought the BT1500A about 6 months ago because of the relay switching between high and low capacity. It had some problems on the higher bands with stray capacity but was ok. A few years back I bought the Palstar AT1500BAL and was really happy with the tuner. Over the years I have constructed tuners with some working fine and some not all that well. I have always used a transmatch because I prefer open line. The ability to use my FW loop (546 feet around, hanging from 100 ft+ tall Redwood trees) on four bands, without having to monkey around changing feedline lenghts is a real plus. A bit pricey, but I found mine used, in excellent condition, so that helped somewhat. The construction and look of the unit is first-rate. My old HB tuner was sharp as well, so I can live with it. Since the tuning is quite sharp anyway, the backlash complicates obtaining a perfect 1:1 SWR a bit. Second, there is just a bit of backlash in the vernier drive for the variable capacitor. I may install a couple high-ouput LEDs to remedy that. Two minor complaints: first, the cross-needle SWR/Power meter's illumination is weak. The Palstar gives me a good match on all bands, 160-40. The main reason was I could get my HB tuner to tune my loop to a 1:1 match on 160, 80, 60 and 40 meters, but it would either do 80 or 40 but not both well, with a given length of 450 ohm window line. Therefore, most models cannot be operated concurrently, and are only used for a certain transceiver.After 20+ years of using my HB link-coupled tuner to feed my FW 160 meter loop in the vertical plane, after doing much Web research on tuners and tuner circuits, I elected to upgrade to the Palstar BT1500A. ![]() Because of its detection circuit, the control circuit and coding method and interface do not have a universal protocol. Most of the finished products adopt the closing of automatic control switches to achieve the purpose of tuning. In fact, almost all antenna tuner structures and principles are the same. It can be seen from the figure that the structure is very simple. ![]() Schematic Diagramįigure 1 shows the schematic diagram of the antenna tuner circuit, and Figure 2 shows the actual diagram. This is because it is a tuning transformer, which improves the RF selection of the receiving device. In addition to increasing the strength of the signal, the antenna tuning device can reduce the spurious response of the receiver. Due to different antennas and operating frequencies, the impedance presented by the antennas can vary greatly. The impedance mismatch caused in this way will cause great loss to the signal transmission, and even cause the transceiver to malfunction or be damaged. The antenna tuner plays a very important role in short-wave radio communications. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |