Pleased to report after 1.5 years, Portsdown TX working OK, now to build the PA box!!
Got to be the longest build on file!!
73
Andy G3UEQ
At last
Re: At last
Hi Dave
Yes, will post later, just got to do wiring to switching sockets on back panel for PA and C/o relays. Got to put on spectrum analyser tomorrow and thoroughly test, think might have small problem with LO filter.
73
Andy
Yes, will post later, just got to do wiring to switching sockets on back panel for PA and C/o relays. Got to put on spectrum analyser tomorrow and thoroughly test, think might have small problem with LO filter.
73
Andy
Re: At last
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Last edited by G3UEQ on Wed Nov 28, 2018 10:36 pm, edited 2 times in total.
Re: At last
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Re: At last
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Re: At last
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Re: At last
I used two LM338 TO220 5 amp regulators to supply everything, the first one goes to 8V, then second to 5.2V, this keeps dissipation very low and of course no noise. Running the IQ board from 12v using internal regulator bolted to chassis and fitted 78S05 2A device.
Just need to wire in attenuator .
73
Andy
Just need to wire in attenuator .
73
Andy
