A Golborne Forum member - a chum of mine - lost his way and strayed onto another forum where he asked for advice about kits and designs for a signal tracer/injector. I know that a couple of GF members have guided him back onto the right track, and he phoned me earlier today to say that he's ordered the Vellman kit.
As its several months since this thread was posted, I thought it might be worthwhile bumping it, in case newer forum members haven't seen it and might find it useful.
Although I made an external RF probe, there's no reason why the components in that probe could not be incorportated along with the kit PCB inside a project box, and an RF input socket be fitted. Similarly, the 0.1uF cap in the AF probe - included as a precaution to protect the PCB should the probe be indvertently applied to an HT point in a set - could be included inside the project case at the AF input socket. Should the RF probe components be placed at an RF input socket, then the AF probe as it stands could be used for the RF/AF inputs and the injector output.
Hope that helps any prospective contructors.
It's true of course that a kit isn't the only way to go - such things as PC speaker/amps which can often be found at car boot sales and charity shops for a pound or two make excellent signal tracers with a suitable probe, and a simple multivibrator using a couple of transistors or an IC could be made as a signal injector. But the Vellman kit isn't expensive, can be had from ESR Electronics the next day, and built in half an hour.
Pays your money, takes your choice!
As its several months since this thread was posted, I thought it might be worthwhile bumping it, in case newer forum members haven't seen it and might find it useful.
Although I made an external RF probe, there's no reason why the components in that probe could not be incorportated along with the kit PCB inside a project box, and an RF input socket be fitted. Similarly, the 0.1uF cap in the AF probe - included as a precaution to protect the PCB should the probe be indvertently applied to an HT point in a set - could be included inside the project case at the AF input socket. Should the RF probe components be placed at an RF input socket, then the AF probe as it stands could be used for the RF/AF inputs and the injector output.
Hope that helps any prospective contructors.
It's true of course that a kit isn't the only way to go - such things as PC speaker/amps which can often be found at car boot sales and charity shops for a pound or two make excellent signal tracers with a suitable probe, and a simple multivibrator using a couple of transistors or an IC could be made as a signal injector. But the Vellman kit isn't expensive, can be had from ESR Electronics the next day, and built in half an hour.
Pays your money, takes your choice!
Regards, David.
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
