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Don't know if it makes a difference, but I adopted the habit of putting the 7808 at the power supply end, and running the output to the counter. Soldering the regulator's metal tab to the ground foil on the radio circuit board seemed to work best. The ground foil provided enough heat sinking. Seems like putting it into the enclosure should do the same thing, but I haven't tried it that way. The data sheet's advice to use a capacitor on the regulator's input pin is no biggie when it's soldered to a ground foil a fraction of an inch away from the big filter cap. Shouldn't need to put a cap on the regulator's output pin, there's a 47uf on the power input on the PLJ.

Just why it interfered when it was inside the radio isn't clear at all.

73

[QUOTE="nomadradio, post: 854916, member: 22"] Don't know if it makes a difference, but I adopted the habit of putting the 7808 at the power supply end, and running the output to the counter. Soldering the regulator's metal tab to the ground foil on the radio circuit board seemed to work best. The ground foil provided enough heat sinking. Seems like putting it into the enclosure should do the same thing, but I haven't tried it that way. The data sheet's advice to use a capacitor on the regulator's input pin is no biggie when it's soldered to a ground foil a fraction of an inch away from the big filter cap. Shouldn't need to put a cap on the regulator's output pin, there's a 47uf on the power input on the PLJ. Just why it interfered when it was inside the radio isn't clear at all. 73 [/QUOTE]

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