General Category > Amateur Radio
Project 775
pjxii:
Josh, I can't believe how well you've gotten to know this transceiver! Thanks for all your work, it's greatly appreciated
Josh:
Thanks, kinda a icom rx nut from way back (arigato Inoue-san!) and they all seem to share a lot of the same design philosophy so you get to know part numbers, expected gain, etc. Started out with an R70 in '89 and a few months later with a 751. Had 735, 745, 751 and 751A, 765, 761, 756Pro and ProII, and lastly the 775 for tx, R70 and several R71s plus the R7000 for rx.
I wonder why the Italian HAMs who devised the 775 mod pdf don't recommend replacing the 3sk thingy with the bfr thingy for lower nf in the IF amp if you splice in a inrad roof. Pretty sure you can come up with an additional 3 or 4db gain with the inrad roof filter amp (let alone a spot on alignment) so could make up for the lost gain. I'm in a quandary over mine, should I forsake the am rx side and mod for ssb work or leave it possible to rx wide sigs like am and fm? This thing sits on ssb all day day in day out and I've several other rigs that sound better on am.
pjxii:
--- Quote from: Josh on November 16, 2019, 1921 UTC ---I wonder why the Italian HAMs who devised the 775 mod pdf don't recommend replacing the 3sk thingy with the bfr thingy for lower nf in the IF amp if you splice in a inrad roof. Pretty sure you can come up with an additional 3 or 4db gain with the inrad roof filter amp (let alone a spot on alignment) so could make up for the lost gain. I'm in a quandary over mine, should I forsake the am rx side and mod for ssb work or leave it possible to rx wide sigs like am and fm? This thing sits on ssb all day day in day out and I've several other rigs that sound better on am.
--- End quote ---
Can you give me details about that mod regarding the Inrad roofing filter, please?
Personally, since I have other receivers that sound great on HF I'm not worried about how AM sounds on the 775. I would think that if you aren't using it for AM or FM tx optimizing it for SSB would be the way to go.
Josh:
Here's a link to the pdf on the mods, I translated it into English and it came out very well;
https://www.filemail.com/d/vdwnpnjhonrxdbl
You can open a pdf right?
pjxii:
Yes, got it. Thank you!
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