![[Photograph of completed box]](../../images/hf-amp11.jpg)
The lid and top are fitted with the four countersunk screws supplied and the end result is a small screened instrument case with a really professional finish. No more scruffy old die cast boxes, tobacco tins or second-hand enclosures.
Figure 11
This article has demonstrated how easy it is to work with the FLEXI-BOX. The basic project box with the Transmission Line PCB is normally the best starting point for a small RF project. Can we make it any easier that that? Yes, there is a ready built version that is manufactured with your selection of connectors at HF Amplifier. The connectors are selected from BNC, SMA, TNC and N type and will fit directly onto the aluminium box with no drilling or taping.
The performance of this circuit is excellent and the characteristics can be perused in FLEXI-BOX HF Amplifier
For those that need information on soldering and de-soldering, there is an excellent collection of soldering videos at solder.net
For those that wish to take the design a step further and have a PCB manufactured, there are many free software packages available for laying out a PCB each with their own advantages and disadvantages. A problem that can often occur after spending hours and hours laying out a PCB to perfection is that the software package generates Gerber files that are incompatible to industry standards and you are unable to get the PCB manufactured. A small collection of software utilities that can be very helpful for this is CADCENTRIC which can be found at http://www.lh1.org/AUTOTRAX/autotrax.html and is particularly useful for converting the old RS274D gerber files to RS274X and has other functions for AUTOTRAX which is available free from Protel.