|Fig.1 - The finished key|
|Fig.2 - The parts kit|
I tried to fit the jack socket into the housing but it was too tight to push all the way through the hole. However, it looked quite neat flush against the panel, and it wasn't going to move easily. The ground terminal on the jack connects to the common contact for the keyer, i.e. the long screw. It is connected via a wire that runs underneath and connects to the screw via one of the solder tags provided with the kit. The other screws, nuts, washers and solder tags form the moving contacts on the paddles. The wire that is supplied for wiring the paddles is quite thick, so some builders may want to substitute something more flexible. I found that the supplied wire worked okay providing you get the length right. The 'bearings' for the paddles are M3 screws. If these are insufficiently tightened there will be too much 'play'. If overtightened they will not move freely. I decided to add a couple of lubricated washers to reduce the friction. There is a small compression spring that fits between the paddles. This is easy to lose (you have been warned!). There are several possible positions for the spring, giving you limited adjustment of operating force. The photos show how I assembled my key. As mentioned earlier there were no assembly instructions provided.
Having completed the assembly, I found that one of the paddles fouled on the housing. This was rectified by filing away some of the plastic.
The large holes either side of the housing give the impression that the contacts are meant to be adjustable (without removing the housing), but this does not look practical. In any case, I found the contact gaps to be just about right with the screws fully tightened.
The Keyer in Operation
The kit includes a cable with 3.5mm jack plugs on each end for connecting the key to the transceiver or electronic keyer. I tested the key with my Rockmite QRP transceiver and it worked fine. Don't expect a silky smooth action - this is a 'dirt cheap' key and it is not realistic to compare it with something costing at least 10 times as much. Having said that, the operation was perfectly acceptable.
ConclusionsFor a very small outlay I have a neat little squeeze key to use with my ultra portable radio setup. My original intention was to mount it on the radio itself, but it is a little bulky for that. Quality-wise it is 'cheap and cheerful'. You get what you pay for, but having said that, it does the job. The key is also available in larger sizes. Fig.8 shows it next to my home station key for size comparison.
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