What is the problem with the Kenwood ts-450?

A common problem when using a KAM-Plus multimode with the Kenwood TS-850 or TS-450 occurs when the KAM-Plus is coupled to the Accessory-2 socket on the back of the transceiver, producing noticable distortion of the transmitted audio when using the microphone in SSB mode..

Where to find vr18 on Kenwood ts-450?

With both the TS-450 and TS-850, adjusting the input sensitivity is straight forward and the transceiver manuals show you the appropriate control and its location.. This is in both cases VR18 to be found on the main board of the radio,(refer to manual) in practice I found that it was best to adjust this control fully counterclockwise..

How to remove digital unit from Kenwood ts-450-qsl?

Remove two screws of front panel (left and right top sie),and loosen two srews of front panel (left and right bottom side). Remove all screws of digital unit ( X46-312X-XX ). Cut the chip diode D27 (RL73) on digital unit rear side.

What kind of tuner does Kenwood ts-450s have?

MC-43S hand mic included. The Kenwood TS-450SAT includes the AT-450 antenna tuner factory installed. The Kenwood TS-690S is similar to the the Kenwood TS-450S, but adds coverage of the 6 meter amateur band with 50 watts and a separate antenna jack on the rear panel .

Why does my ts-450 / 690 have no feedback?

Packet receive output, J2, has unusally high level of distortion making output generally unusable for modern digital modes. These second order harmonics are generated in the receiver audio and are not a problem at the transmitting station. Packet out amplifier, Q38, has no feedback.

How to replace C20 on ts-450 / 690?

Replace C20 on the AT UNIT. This capacitor is sandwiched between the two motor drive ICs, IC4 and IC5. When replacing C20, lay new capacitor over away from motor drive ICs. Check, resolder, improve connection from filter board to SO-239 on real panel. Check to see if any mods and Service Bulletins have been applied.

What kind of regulator do I need for ts-450?

Use a Toshiba TA48S09AF SMD 9V regulator with ON/OFF and mount on foil side ground of driver board somewhere. Cut 50T signal near CN3. Note corrected CN3 signals. Scrape away resist of ground foil and tin area between C6 and C9.