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Amateur Radio / Re: Project 775
« on: September 11, 2024, 1042 UTC »
Just found this interesting forum / discussion group and as I was wondering how to fill the option filter slots for the 9mHz and 455kHz slots as well.
As I would like to "improve" my Tx/Rx audio on SSB having the 3.3khz wide SSB filter FL-257 availabe at my desk I wonder if it would be worthy to go ahead with the FL-96 stock filter replacement for the 455khz IF and try to replace de FL-80 with the FL-70 or FL-103 on the 9mhz IF.
Would one expect the FL-257 be efective for better audio intelegibility on RX and TX (when installed on the FL-96 slot) even for dx? or for dx it would be better install the FL-44A instead pairing it with the stock filter FL-80?
I read a 775DSP thread on eham stating a "neat mod for the IF board that opens up the restricted transmit audio a bit. This is done by replacing the soldered-in stock FL-80 and FL-96 filters (2.4 and 2.8 kHz, respectively) with the FL-103 and FL-257 (2.8 and 3.3 kHz, respectively)".
Also someone shugested "On the reciever end of it i took out the FL-222 1.8 455khz SLOT and replace it with the FL-257 3.3khz" but this suggest that it would be only on RX side thus not improving TX side.
Will thank you in advance any thoughts you may share.
73 pedro
As I would like to "improve" my Tx/Rx audio on SSB having the 3.3khz wide SSB filter FL-257 availabe at my desk I wonder if it would be worthy to go ahead with the FL-96 stock filter replacement for the 455khz IF and try to replace de FL-80 with the FL-70 or FL-103 on the 9mhz IF.
Would one expect the FL-257 be efective for better audio intelegibility on RX and TX (when installed on the FL-96 slot) even for dx? or for dx it would be better install the FL-44A instead pairing it with the stock filter FL-80?
I read a 775DSP thread on eham stating a "neat mod for the IF board that opens up the restricted transmit audio a bit. This is done by replacing the soldered-in stock FL-80 and FL-96 filters (2.4 and 2.8 kHz, respectively) with the FL-103 and FL-257 (2.8 and 3.3 kHz, respectively)".
Also someone shugested "On the reciever end of it i took out the FL-222 1.8 455khz SLOT and replace it with the FL-257 3.3khz" but this suggest that it would be only on RX side thus not improving TX side.
Will thank you in advance any thoughts you may share.
73 pedro
