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Nomad mentioned a ground loop. Sounds like you have one. You have a ground with the teflon signal wire at the VCO, and you have a power ground. If the two grounds, signal and power in the counter, are tied together in the counter, it is the equivalent of inserting a big loop of wire between the supply ground and the VCO ground.

The power requirements of the counter cannot be too significant, so could you move the power ground to where the signal ground is, or remove the negative power lead entirely and let the shield do that?

[QUOTE="brandon7861, post: 855051, member: 53724"] Nomad mentioned a ground loop. Sounds like you have one. You have a ground with the teflon signal wire at the VCO, and you have a power ground. If the two grounds, signal and power in the counter, are tied together in the counter, it is the equivalent of inserting a big loop of wire between the supply ground and the VCO ground. The power requirements of the counter cannot be too significant, so could you move the power ground to where the signal ground is, or remove the negative power lead entirely and let the shield do that? [/QUOTE]

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