President Lincoln IF filter
Posted: Sat Mar 25, 2017 6:35 am
GF,
I'm aware of all the cap changes to help in the audio response. I know most hardcore DXers will try to increase selectivity by narrowing the IF filter. Looking at the schematic, the 455Khz 2nd IF is only used for SSB. Am I wrong at thinking the AM is only limited in bandwidth by the 10.695 Mhz FT-102? I dont operate on SSB , my only mode is AM. I have swapped all my personal radios for a wider 2nd IF normally at 9Khz for a 6Khz usable BW. Is there any problems getting a wider 10.695 filter? I'm aware of the adjacent channel bleed over possibility but I like to listen on the wide side. Also have the AM carrier pot on the front panel and do notice that if set to high, it'll back swing. The variable deadkey mod online, lifts R175 and routes it to the SWR Pot on the front for a variable deadkey. Is the R175 and essentially VR107(AM carrier pot) defeating each other if used that way/
I'm aware of all the cap changes to help in the audio response. I know most hardcore DXers will try to increase selectivity by narrowing the IF filter. Looking at the schematic, the 455Khz 2nd IF is only used for SSB. Am I wrong at thinking the AM is only limited in bandwidth by the 10.695 Mhz FT-102? I dont operate on SSB , my only mode is AM. I have swapped all my personal radios for a wider 2nd IF normally at 9Khz for a 6Khz usable BW. Is there any problems getting a wider 10.695 filter? I'm aware of the adjacent channel bleed over possibility but I like to listen on the wide side. Also have the AM carrier pot on the front panel and do notice that if set to high, it'll back swing. The variable deadkey mod online, lifts R175 and routes it to the SWR Pot on the front for a variable deadkey. Is the R175 and essentially VR107(AM carrier pot) defeating each other if used that way/