[ARC5] 10 meter BC-454 - more yet.

[Kenneth G. Gordon]

On 12 Feb 2013 at 15:57, Mike Everette wrote:

> This may seem like grabbing at straws... but if you remove the coil
> rack, and "thump" the coils real good with your finger, and either
> feel or hear any (ANY) mechanical vibration as a result, this COULD be
> part of the problem.

See below: you are SO right

>  It may come from too stiff a wire being used to
> mount the coils to their bases.

I thought of that some time ago, but eventually eliminated that as a cause.

> Are the coils in your receiver air-wound or on the forms?

They are on beautiful little ceramic slug-tuned forms.

> For what it may be worth.

It is worth one heck of a lot, Michael.

In fact, that is exactly what I found, only minutes before I got your post: the slug inside the coil 
form is so loose that the slightest movement anywhere in the receiver makes it move. It 
would, very clearly, vibrate with sound.

And I discovered this quite by accident: I had removed the coil to coat it with coil dope, and 
just happened to be looking into the coil when I rocked it from side to side. The slug was 
literally flopping around in there.

At this point, I am VERY tempted to simply fill the form with that coil dope made from MEK-
dissolved styrofoam cups.

What do you think about that?

Ken W7EKB