开云体育

I posted the message below to the Kenwood-Hybrid group but thought the information may be useful here.

--------------------------------------------------------------------------------------------------------------------------
A while back there was a discussion concerning RF detector probes.? Since then, I had been looking for a NOS or used Heathkit PK-3 probe but these don't seem to be as common as the Heath PK-1 universal scope probe.? I decided to purchase a PK-1 probe with the intent to convert it into an RF probe and actually made it more functional than the PK-3.?

Because the PK-1 comes with a SPDT switch, I use it to my advantage to switch either high or low RF detection sensitivity.? The PK-3 manual gives the builder an option of installing one, or up to three germanium detection diodes.? So, the choice of probe sensitivity is chosen at the time of the build.? With a switch, that decision is no longer a concern.?

Using a Dremel tool, I cut new circuit traces on the PK-1 PC board that allows for the switched probe sensitivity.? The input cap can be seen at the lower edge.? It's 0.001 uF NP0 SMD with a 1KV rating.? ?All diodes are 1N60P.? The original design calls for using uninsulated braid for the ground return lead.? I decided to insulate it with blue heat-shrink tubing.? Images attached.

Paul, W9AC

?