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Old 4th Apr 2020, 7:47 am   #6
g4wim_tim
Pentode
 
Join Date: Nov 2018
Location: Freckleton, Lancashire, UK.
Posts: 111
Default Re: 6 metre 4 pole filter

Hi Terry,

there's at least two mistakes in that drawing.

RL 1 should be powered from the switched tx/rx 12V line and C55 should couple to TR12.

Looking at that design makes me realise how old it is with the choice of components etc.
I still have rig and it still works. I even have the 144MHz version which was published in Wireless World in 1981/2 !

I dread to think the hours spent designing and writing the code for it - but very satisfying at the time.

73 Tim
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Building and tinkering for over 50 years, from 807's to digital amateur TV.
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