User manual KENWOOD TS-450S SERVICE MANUAL

[. . . ] In developing this new HF transceiver, Kenwood has boldly chosen not to follow this path, because we wanted to develop a transceiver unlike any other available. If we had developed a product along the same lines as the others currently in the market, the customers would not have found it a very attractive buy and few would choose it. This is why we wanted to develop a unique and attractive Kenwood product, something that would effectively serve to create a new market. It was with these thoughts that we embarked on our new project and began to mull over the details. [. . . ] Switch ON to operate a frequency in memory without transferring it to a VFO. You can pause the scan for 5 seconds, a handy way to avoid missing a signal. You can switch between time-operated and carrier-operated scan resume to suit your purpose. 01 Tuning 02 03 04 05 Tuning control adjustment rate Frequency step for the main encoder in FM mode Frequency rounding for the MULTI control Frequency step size for BC band 06 Memory channels Scan functions 07 08 09 10 11 Temporarily change memory frequency Program slow scan Program slow scan setting Program scan hold Scan resume method 29 Volume adjustment 12 13 14 15 16 Beep output level Sidetone volume VGS-1 message playback volume VGS-1 announcement volume VGS-1 announcement speed Use CW IF filter for SSB reception DSP RX equalizer You can adjust this to suit your preference. For full break-in, it is easier to hear the sidetone if you raise this volume. Switch this OFF if you do not need announcements while working the radio. As with #18, this is not as versatile as a dedicated graphic equalizer, but it is useful for tailoring TX frequency characteristics to match your mic and voice. As this is AF DSP, it is not as versatile as IF DSP, but it can be used to remove low frequencies during transmit. You can change the frequency displayed by the transceiver to the operating frequency of the Transverter. Transverter output is fixed at 5W for the TS-570, but with the TS-450S you can choose output freely (within the transmitter's capability). RX IF filters DSP equalizers 17 18 19 DSP TX equalizer DSP TX filters Fine-tuning TX output TX control 20 DSP TX filter bandwidth 21 TX power output control 22 Time-out timer Transverter 23 Frequency when using transverter 24 Output power adjustment for transverter 30 Antenna tuner 25 TX hold when internal AT completes tuning In-line AT while receiving 26 27 External AT control method Linear amp 28 29 Linear amp control for HF band Linear amp control for 50MHz band VGS-1 constant recording After completion of tuning, there is still approximately 10W of output, so this is useful if you want to go on to tune the linear amp. Depending on conditions, sensitivity can vary by enough to see a change in the S-meter. If you own an AT-300, you can connect it to the TS-450S; however, operation is limited by the capabilities of the AT-300. Irrespective of the current operating mode and power, this function allows you to transmit a continuous carrier at a fixed output. Toggle between FM and AM when FM (AM) is displayed. 34 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 99 TF-SET Q MR Q MI SPLIT A/B M/V A=B SCAN M >V M. IN CW TUNE CH1 CH2 CH3 FINE CLR MTR MHz ANT 1/2 NB NR BC DNL OFF You can assign a function you often use to a PF key on the mic. Also, a function defined by pressing the key for 1 second can be called up instantly. For example, if you find yourself frequently switching between antennas, you can save time if you assign a panel PF key to ANT 1/2. No function is assigned to the PF key. 35 Making menus easier to use Menu switching There are so many different menu selections and parameters to choose from that it is impossible to remember them all. Consequently, the menu system can be a little inconvenient when you need to change several settings at once. Switching between these can greatly simplify operations ­ for example, when switching from DX to local, from regular to data communications, or from fixed station to mobile operations. Quick menu The TS-450S offers many menu functions. If you know which functions you use most of the time, you can arrange for other functions to be hidden when selections are displayed. 36 Structural Features Internal structure of the main unit The internal structure of the main unit is straightforward: employing a die-cast aluminum chassis, it is designed so that the circuit boards are attached from both above and below. From above one can see the TX/RX unit, the filter unit and the relay unit; seen from below, there are the RF unit and the final unit (or final/AT unit, in the case of the SAT model). There is also a separate display unit in the standalone control panel. 23~25 illustrate the arrangement of these units. Filter unit Relay unit Final unit TX /RX unit Fig. 23: View from above (both models) RF unit Fig. 24: View from below (TS-450SHX) Final /AT unit RF unit Fig. 25: View from below (TS-450SSAT) 37 Cooling In developing the TS-450SHX, the most important issue when it came to structural design was how to arrange for sufficient cooling. In order for this transceiver to be capable of 200W output and yet have the same compact design as the TS-50, we examined dozens of different cooling fans, various circuit board patterns, and a variety of different cooling fan layouts. [. . . ] Owing to the delays inherent in a network, this system is not compatible with full break-in. For this same reason, it is also not recommended for operations that require strict TX/RX timing (contests or pileups). Also, break-in time should be set longer than usual. 56 Sound Problem The sound does not get through (host PC). Check what audio input method (MIC/EXP-SP or DATA) has been selected for the transceiver. [. . . ]