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Comments on In Call of Cthulhu, what's best practice for requiring skill checks when there's uncertainty about which skill would be required?

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In Call of Cthulhu, what's best practice for requiring skill checks when there's uncertainty about which skill would be required?

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Looking at the Call of Cthulhu 7E character sheet, I see two "investigator skills" that look very similar to me: "Elec Repair" and "Mech Repair". One is short for Electrical Repair, the other for Mechanical Repair.

The skill descriptions I found online say:

Electrical Repair (10%) – Enables the investigator to repair or reconfigure electrical equipment such as auto ignitions, electric motors, fuse boxes, and burglar alarms. To fix an electrical device may require special parts or tools. Jobs in the 1920s may call for this skill and for Mechanical Repair in combination.

Mechanical Repair (20%) – This allows the investigator to repair a broken machine, or to create a new one. Basic carpentry and plumbing projects can be performed. Special tools or parts may be required. This skill can open common household locks, but nothing more advanced. See the Locksmith skill. Mechanical Repair is a companion skill to Electrical Repair, and both may be necessary to fix complex devices such as an auto or an aircraft.

If I were to have my character attempt to, say, repair a wire for a radio antenna - something I have IRL experience with and know does not, largely, require electrical knowledge - would I use Electrical Repair or Mechanical Repair for this? A combined skill roll where I must roll under the lower percentage to succeed?

Generally speaking, when there's a question as to which skill would be required, should the Keeper ask for a combined skill roll, choose one and require a skill roll, or require skill rolls for both skills?

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1 comment thread

Regarding antenna wires (3 comments)
Regarding antenna wires
Lundin‭ wrote almost 3 years ago

Not sure what you mean with antenna wire. But here's a bit of a head's up from someone who does work with antenna wires quite often in a professional setting: The ideal antenna wire IRL is a coaxial cable: copper surrounded by plastic surrounded by braided metal threads forming a shield, surrounded by another layer of plastic. Installing or repairing them is not as trivial as it may seem: you'll want them as short as possible, you'll want to avoid sharp turns, you'll want to keep them apart from high current signals and so on - you need basic EMC skills (electromagnetic compatibility). Soldering them to the various types of antenna connectors is quite hard even for someone with soldering experience, you need to train it a lot to do it well. Summary: you do absolutely need electrical knowledge to deal with coaxial cables. Soldering sorts under electrical repairs.

Mithical‭ wrote almost 3 years ago · edited almost 3 years ago

Lundin‭ - I'm referring to cables such as rg217 or rg213; it's rather trivial to test where the problem is using a TDR and to swap out connectors without requiring extensive electrical knowledge.

Lundin‭ wrote almost 3 years ago

That entirely depends on the type of connectors and the desired quality of the radio signal. The kind of low quality connectors where you just attach the copper wire to a screw terminal are easy to replace, sure.