So, now that I have built and done the basic DC test on the new FT-847 pre-amp last time:
http://g0mgx.blogspot.co.uk/2012/06/ft-847-4m-70mhz-pre-amp-mod.html
It's time to install the board in the Radio. This looks to be a fairly straightforward operation, replacing one board for another.
Here is the old "daughter" board inside the radio just prior to removal:
And this is the gap - this picture was taken to ensure I could remember where the old board wired into the main board - re-fitting being the reverse of removal!
So here is the new daughter board which includes the 70MHz pre-amp just being tacked into place:
And here with the wiring complete:
All I need to do now is find a suitable signal and peak the variable inductor for maximum smoke; that should be a doddle. I can hear the relays operating as the tuning range enters and leaves the operating frequencies, so something is working as planned.
Not bad, egh?
http://g0mgx.blogspot.co.uk/2012/06/ft-847-4m-70mhz-pre-amp-mod.html
It's time to install the board in the Radio. This looks to be a fairly straightforward operation, replacing one board for another.
Here is the old "daughter" board inside the radio just prior to removal:
And this is the gap - this picture was taken to ensure I could remember where the old board wired into the main board - re-fitting being the reverse of removal!
So here is the new daughter board which includes the 70MHz pre-amp just being tacked into place:
And here with the wiring complete:
All I need to do now is find a suitable signal and peak the variable inductor for maximum smoke; that should be a doddle. I can hear the relays operating as the tuning range enters and leaves the operating frequencies, so something is working as planned.
Not bad, egh?
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