Modifying the FT-897 to get the best from it.
I have been using my ft-897 for a while now, the main rig has a fault and I have been far too busy to get it sorted and repaired. I found it was not quite right, I have been spoiled by using quality receivers over the last few years and I couldn't quite put my finger on what was missing. Some reading online and some tests quickly helped me identify what it was, the AGC was a little too fast and the audio amplifier adds a certain hiss and noise to a signal. I found two fixes online, the first one was to add a capacitor in parallel to modify the AGC hang time adding it to C1503 - mod to be found on DG2IAQ modification sheet, a great source of information for any 897 owner. found here. http://www.ok1kng.netcontrol.cz/rs/download.php?soubor=25 The other fix was to reduce white noise, the info can be found here. http://ok1fig.nagano.cz/FT897D/FT-897D_LessWhiteNoise.htm By adding two capacitors to make up the 0.75uF and a resistor of 68 Ohm between pins 2 and 4 on the IC the TDA200