Fiberglass + tin ... for installation. Encyclopedia of radio electronics and electrical engineering Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies The well-known radio amateur S. Zhutyaev proposed a method for mounting VHF equipment on "patch patches" [1], the essence of which is as follows. A double-sided foil material is taken, and on one of the sides (mounting side), the foil is removed with a special circular cutter in such a way that a round isolated patch (support platform) is obtained. Such patches are made in the necessary places, and they are mounted by soldering radio elements and connections. With this method, it is necessary to carefully connect both sides of the foil (the opposite layer acts as a shield), since a volumetric distributed parasitic inductance can form. In addition, this method requires a special device (circular cutter). With frequent soldering during tuning, the patch may peel off due to heating, which creates certain additional problems. I propose another method that I have been using with success for several years. It is as follows. Double-sided foil fiberglass is taken in the form of narrow strips. These may be PCB scraps, which are usually thrown away.
Then one of the sides is tinned with a soldering iron, and the strips are cut into cells and short strips of the required length (Fig. 1). After that, tinned, so-called "tinplate" is taken, preferably sheet, but can also be used from a tin can. In the right places, according to the intended installation, pieces of foil fiberglass are placed on it with the tinned side. Further, carefully so that they do not move, the tin plate with "patch" is taken with pliers and horizontally brought into the flame of the gas burner of the stove. The fire should not be too strong (it should be chosen experimentally). As soon as the solder melts ("piglets" seem to settle at the same time), the plate is taken out of the fire. The main thing here is not to burn it, because in this case the lower layer of the foil peels off, and the “half” on the tin gathers into drops. At first, there will probably be these troubles, but the skill comes very quickly, and the board turns out to be even, with a smooth opposite side. Piglets at the same time hold tight. If, during numerous solderings, the foil from the patch nevertheless flies off, then it is very easy to replace it, heating it with an ordinary soldering iron from the opposite side. Figure 2 shows samples of finished devices - antenna amplifiers (using chip capacitors) and 2-meter range amplifiers.
The method turned out to be so convenient and productive that I use it for layout as well. Due to the fact that there are no two "ground" layers, parasitic inductances are minimal. I made various UHF amplifiers, they all worked stably. Of course, variations of the method are possible. For example, gas heating "can be replaced with electric, and tinned sheet can be replaced in especially critical cases with silver-plated brass, etc. But it is better to take high-quality material for patches so that you can re-solder the elements on them repeatedly and not be afraid of peeling the foil. Literature 1. Zhutyaev S.G. Amateur VHF radio station. - M.: Radio and communication, 1981. Author: A. Goncharov (RU4HG), Samara Publication: N. Bolshakov, rf.atnn.ru See other articles Section Ham Radio Technologies. Read and write useful comments on this article. Latest news of science and technology, new electronics: Artificial leather for touch emulation
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