I have discovered a possible widespread problem with the new Yaesu FT-450D model. There is an ocillation buzzing or high pitch hum close to 800hz that is getting into your tx audio. Many contacts you have will not detect it because your signal may be too low or noise on your hf band will cover it up. Please monitor yourself closely with headphones if you own one of these great little radios. It will also be picked up in the digital recording unit which is built in to this little radio. If you listen closely, you will detect it in your receiving audio on an external speaker by turning down the volume all the way and putting your ear up to your external speaker. I have heard it from others on the air also with this radio recently. I returned my ft-450D last week while I still could to HRO and bought the ft-950 and believe me I did not want to spend the extra money before Xmas season right now!. It is certainly too bad about this problem. There are coments about this posted on Eham also under reviews from another station. I firmly believe it maybe a grounding problem due to the display on this radio causing the noise to filter into the audio. I am quite confident about what I heard because I am an audiophile nut and have golden ears, hi hi. Any other comments about this problem I would love to hear more from you...thanks!