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Tuning Aid

An aide to help you easily live with the latest equipment with the most ubiquitous ones.

(RadioKit Electronica 5/2017).

Material, such as the PCB file, as well as the HEX file for programming the microcontroller: 

 

Files:
TunningAid_v3 3

Date 28-04-2017 File Size 687.99 KB Download 42 Download

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Board v1

On November 2016 Radio Electronics Kit it has published a project for the construction of a protection circuit called Crowbar. The files of the circuit diagram, the PCB, the assembly diagram and parts list, in PDF format, can be downloaded from the following link:

CROWBARv1 HOT
BillOfMaterials, PCB, Schematic, SilkTop
Author i6dvx Website Website Date 17-10-2016 File Size 227.27 KB Download 121 Download

 

It 'was developed a second version of the Crowbar where the reference zener is the integrated circuit TL431. The motivation for this is due to the fact that the low-voltage zener, as may be the BZX55C 3V3, have a Breakdown voltage not very stable to vary the current. The variant guarantees a better stability of the reference voltage. The graph shows the measurements of Breakdown voltage as a function of the supply voltage, for both the TL431 for both BZX55C zener 3V3. The values shown in the graph refer to the averages of 5 samples of the two devices.

 

The files of the circuit diagram, the PCB, the assembly diagram and the parts list in PDF format, the second version of Crowbar, can be downloaded from the following link:

CROWBARv2 HOT
BillOfMaterials, PCB, Schematic, SilkTop
Author This email address is being protected from spambots. You need JavaScript enabled to view it. Website Website Date 17-10-2016 File Size 204.5 KB Download 114 Download

The most important thing is the appropriate choice of fuse-coupled SCR. E 'you need to compare the I2t parameter, which is the energy necessary to the merger of the device. The value of this parameter of the SCR diode, noted from the data sheet, must be far superior to the same fuse parameter. Otherwise there is a risk that the SCR diode bases before, or at best, together with the fuse. 

 

 

 

 

board v2

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IC7400BIcom IC-7400: ATU repair 

 

A few months ago my trusty IC-7400, when the automatic tuner attivavo an embedded, it was a tantrum. In the sense that a few times, few, reached the point of minimum VSWR, many times after a tentative agreement, the tuner was disabled..

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1982, Ancona Landslide

 

Way back in 1982, December 13 at around 20:45 hours in Ancona, a large, deep landslides, called Barducci, began his movement. It involved different parts of the city: Posatora, Borghetto and partially Torrette. The landslide damaged over 280 buildings. It involved even two hospitals and the Faculty of Medicine and Surgery of the then University of Ancona.