[OFARC] Club Band pass filter project

[Ralph]

i have been unable to find junked computer power supplies

does anyone ave a computer repair shop they can check?

or another source of boxes??


KE5HDF

Ralph


On 08/01/2017 09:16 PM, Ralph wrote:
>
> a while back, the club built some band pass filters.
>
> With all the new members plus increased interest in projects, I have 
> received comments about doing it again.
>
> a band pass filter will allow signals of only the selected band to 
> bass through.  All others are blocked.
>
> This is very useful when there is severe interference from some source 
> or there are multiple radios working close together (like field day or 
> other joint event)
>
>
> The only parts are some wore coils wound on PVC pipe and some 
> capacitors, plus the coax connectors
>
> We assemble them in the metal case from computer power supplies.  
> (photo attached)
>
> We have plans and part numbers for 10M, 15M, 20M, 40M, 80M
>
> plus plans and component values for other bands.
>
>
> My thought is we work together to
>
>     understand the filter & demonstrate winding the coils one month
>
>     everyone winds their coils and mounts them at home
>
>     demonstrate mounting the capacitors one month
>
>     everyone works at home to mount capacitors
>
>     the next club meeting we test the filters
>
> (_OPEN FOR CHANGE/COMMENT _... just no rock throwing please!!  )
>
>
> *Please let me know **
> *
>
> *    are you interested in doing this project*
>
> *    the band you want most*
>
> *    a secondary band you would like*
>
> I will then confirm the part numbers and cost for each filter 
> (guessing about $40)
>
>
> 73
>
> KE5HDF
>
> Ralph
>
> input/output connection view
>
>
>
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