Hi Steve, you are right just about all my homemade equipment has holes for trimmers U-QRSS and QRSS included, thanks also for the offer of a new 160m Xtal, if by chance it is not the Xtal I will of course reimburse via PayPal.
73 Colin
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--- In QRPLabs@..., Stephen Farthing <squirrox@...> wrote:
Hi Guys,
There is an little known law of ham radio that generally is infallible but
they never teach on courses or test for in licence exams. It goes like this
:-
If you have a project that works and you put it in a case it stops working
as it did without a case.
I have noticed this several times. For example last week I got around to
putting my frequency counter in a case. On the bench it was accurately
calibrated. In the case the calibration was out by 16 Hz, so I had to
change the trimmer setting to compensate. If you look at "old school"
equipment it often has a hole in the case to allow trimming without having
to take the board out of the case. If you are casing your beacon it might
be an idea to do this.
There is a related law which goes something like this :-
if you have a chassis mount BNC connector you want to use you can never
find the bolts to fit it to the chassis, or the case of the ones that dont
need bolts, the earthing washer.
73s Steve
