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Re: LO Filter test
Posted: Fri Nov 30, 2018 11:03 am
by G3UEQ
That's a shame, something died in o/p stage or an enable function for that chip.
Yes, I use flux pen and good solder wick now, I do have a small hot plate, but not plucked up courage to use that. Have dropped hint for a re-flow station for Xmas!, and yes, I will continuity check on my second filter build as you have done.
Andy
Re: LO Filter test
Posted: Fri Nov 30, 2018 3:01 pm
by G3UEQ
G3UEQ wrote: ↑Thu Nov 29, 2018 11:04 am
Dave
It looks like duff filter board, 71MHz o/p has now died, 2m and 1.3GHz o/ps reasonably OK, lower o/p on 437MHz. Bypassing the filter showed no o/p at 42.6MHz!
So will order new PCB and set of parts from Digikey. That was my first go at SMD and not pretty so maybe s/c somewhere. RF switch was quite neat attempt.
Cheers
Andy
Dave, not sure if you posted replacement board, but whoever it was arrived this morning many many thanks!
Re: LO Filter test
Posted: Fri Nov 30, 2018 3:23 pm
by G8GKQ
Andy
I can't take the credit for that - it was Noel.
Dave
Re: LO Filter test
Posted: Fri Nov 30, 2018 8:00 pm
by G3UEQ
Thanks Dave!
And thanks Noel!
Andy
Re: LO Filter test
Posted: Fri Nov 30, 2018 8:08 pm
by g8gtz
Re: LO Filter test
Posted: Mon Dec 03, 2018 3:03 pm
by G3UEQ
Parts arrived from Digikey, now to build replacement LO filter and repair 1st, might be a spare one later"
Andy
Re: LO Filter test
Posted: Tue Dec 04, 2018 7:54 pm
by G3UEQ
New LO filter fitted and working well, get video now on all bands. Appears to be bit of overdrive in IQ modulator, going to change R24 a,b,c and d to latest specification,
Andy
