Kenwood TS-480HX Manual
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|robbo_davies||8:19pm on Monday, March 22nd, 2010|
|Great product especially at the price In a nut shell amazing what you get for your money.|
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Standalone control panel
For mobile operations, a separate control panel is ideal, but what if the transceiver is also to be used as a base station? This was the problem we faced. With a large desktop rig, it is no easy matter to shift things around to find the best position, so perhaps it would be a good idea to have a separate control panel that could be moved easily. Also, a desktop unit has various kinds of cables connected to it. What with the heat the main unit produces and the noise of the fan, etc., and considering that it does not have to be on the desk in front of you, it would surely be better to separate the control panel and place the main unit elsewhere. With the appearance of computers in todays shacks, it is certainly desirable to tidy up the desktop as much as possible. We felt that we could contribute to this evolutionary process. By opting for a completely separate panel, we could ensure that it would be large enough to offer sufficient operating ease, since its dimensions would not be dictated by those of the compact main unit. This was how we arrived at the idea of a standalone control panel that is slightly larger than the main unit.
Focus on basic performance
The appeal of HF lies in DXing those places near and far. For this reason, we put a priority on operating ease and basic performance. At this point the project team had already excluded any idea of incorporating the V/UHF bands. Our approach was this: Rather than spending development money on the V/UHF bands, lets spend money on HF performance. If someone needs the V/UHF bands, then they can buy another product that is tailored for these bands. This meant we had confidence that our product would offer more than enough punch to perform well even on grueling DXpeditions.
The 200W challenge
As explained, our initial starting point was a desire to create a transceiver like no other. But we would not have succeeded in meeting this objective with just a standalone control panel and an emphasis on basic performance. We needed something more if we were to make the product truly special and stand out from the crowd. The answer was to be found in the realization that DX operations depend on basic performance and power. Real power in a transceiver is something that many people look for. So a radical proposal was made: Rather than making the output 100 watts, lets go all out for 200 watts! But in fact the only transceivers on the market with 200W output were the expensive high-end models. What we were developing was a compact transceiver. We seemed to have run up against a wall: Did this mean that in terms of size and cost we would inevitably end up creating a high-end transceiver? After long discussions, we made a straightforward decision to challenge the status quo: If conventional wisdom dictated that a 200W output was only available from a high-end transceiver, then we would change that dynamic. At this point we could not see how this could be possible, but we stuck to our conviction that a 200W transceiver did not have to be expensive. We were determined to provide the customer with a 200W transceiver at a reasonable price. As a result of our single-mindedness, we were eventually able to achieve our goal, creating a product of about the same size as the TS-50 and, of course, it had heavy-duty specs.
Fig. 1 illustrates TX IM characteristics with 200W output at 14MHz, while the second graph (Fig. 2) charts high-frequency spurious emissions. Fig. 1: TX IMD (output 200W)
Fig. 2: TX Spurious emissions
SPS (separate power sources) [TS-480HX only]
SPS is shorthand for operating at 200W using two 100W 13.8V power sources. To generate a 200W output from 13.8V requires a maximum (total) current of 41A. As previously explained, the TS-480HX employs a pair of 100W final amps. What the SPS design does is to supply these amps from two separate power supplies, as shown in Fig. 3 below. The use of two power supplies may appear inconvenient, but in actual fact this arrangement is quite practical. Many customers already possess a 100W class power supply, so when they acquire this 200W transceiver they do not have to make an additional purchase of a new 200W class power supply. It is possible for them to make use of the 100W unit in their possession. The PS-53 power supply is specified for the TS-480; however, as long as it can produce 20.5A or more continuously at 13.8V, other power supplies can be used. Also, it is possible to operate this transceiver using a single power supply that can produce at least 41A continuously; note, however, that two power cables would still be needed. Fig. 3: SPS schematic diagram
Drive amp Other circuits Final amp 1
DC power supply 1 (13.8V, 20.5A)
Final amp 2
DC power supply 2 (13.8V, 20.5A)
Failsafe device (some TS-480HX versions only)
The use of two power supplies and two final amps in parallel is something that has not been tried before, and naturally there may be some anxiety on the part of the user regarding what would happen if just one of the power supplies suddenly failed. Such a situation would be handled safely, since the TS-480 series is equipped with several failsafe devices. Should a difference of 1V or more be detected between the two power supplies: RX ONLY appears in the display and transmission operations are inhibited. Should the voltage of one power supply drop to zero: if the failed supply is DC1 (Fig. 3), the transceiver is powered down; if DC2 fails, RX ONLY appears in the display and only RX operations are possible. Should a final amp malfunction: if, for example, the output of one of the final amps fell, resulting in an imbalance, PA-ERROR appears in the display and transmission operations are terminated. In addition, there is the usual complement of failsafe devices, including output control triggered by high temperature, high voltage detection, and SWR output control. These failsafe devices will provide temporary protection for the internal circuitry; however, should such a situation arise you should not continue using the transceiver, but rather deal with the problem in accordance with the troubleshooting guidelines.
100W final section
Like the 200W final section, the 100W final section uses 2SC2782 transistors. The drive and peripheral circuits are virtually identical to those in the 200W model, enabling 100W output for the HF~50MHz bands. For the Japanese market, there are 50W and 10W (50MHz: 20W) models, allowing buyers to choose whichever best suits them that is, their license and their intended use (mobile or fixed). It should be pointed out that it is possible to increase the output of these models: the 50W model to 100W, and the 10W model to 50W or 100W. A TS-480 owner who acquires a more advanced license and wants to make use of this capability should go to the nearest service center. Note that it is not possible to upgrade to 200W output. Also, 50W mobile transceiver warranty certification is available for both 200W and 100W models used as fixed stations. Ever since the TS-570, Kenwood has adopted a method of converting transceivers to higher output specifications that does not require a kit. Conversion cannot be performed by the individual user, but because this method does not depend on finding stock of the appropriate kit it is proving popular.
Antenna tuner (TS-480SAT)
The 100W model is equipped with the relay-driven antenna tuner that was developed for the TS-570. Since there is no variable capacitor, gears or other rotating parts, this antenna tuner is very responsive and trouble-free. Thanks also to the several preset memories supplied for each band, you can instantly call up settings when moving up or down a band. You can see the 200W and 100W final sections in Figs. 4 and 5, respectively.
Fig. 4: 200W final section
Fig. 5: 100W final section with antenna tuner
There were two approaches used for the FM circuit of the conventional all-mode transceiver. Either there was a dedicated modulation circuit using a 10.695MHz crystal, or the modulation was performed by the VCO on the 2nd OSC. The latter was not an option for the TS-480, and since the whole transceiver had to be compact, we did not adopt the former approach. How then is FM handled by the TS-480? What we have employed for the TS-480 is something that is rarely seen these days in ham radios: the reactance modulation approach, which does not have the modulation applied directly to the oscillating circuit. This type of circuit was widely used in the days when a crystal was used to change channels in FM car transceivers, but it dropped from sight when PLL became the norm. It is not a new circuit, but it has excellent characteristics. In the TS-480, this reactance modulation circuit is connected to the output of the DDS, which serves as the source for the PLL reference frequency, so effectively it is modulating the 1st OSC. This approach offers several advantages: Since frequency modulation is not conducted in the TX signal circuitry, even if the TX RF signal is passed through a roofing filter, it will not suffer from any delay distortion caused by the filter; Since there is no need for an oscillator to perform modulation, one-shot frequency management is permitted when transmitting on FM with the same precision as SSB; This approach saves on space and cost. Fig. 6: FM modulation block diagram
ATT at BC band
Circuitry after the roofing filter
Except for FM, the TS-480 has a double super: 1st IF is 73.095MHz and the 2nd IF is 10.695MHz. For FM, there is also a triple super as low as 455kHz. This is followed by analog detection and signal processing performed by the AF DSP in a standard arrangement. The AF DSP is not optional: it is equipped as standard. DSP features and characteristics are explained in the DSP section. Three newly developed optional filters are available for the 2nd IF. Previously, there was only one 10.695MHz optional filter: the YK-107C (500Hz). This filter was developed at the same time as the TS-790, and since the focus was on its use for V/UHF, there may have been times when users felt it was lacking when it came to HF operations. So when we were developing the TS-480, we redesigned the 500Hz filter, greatly improving its shape factor. We also used the opportunity to design new 270Hz and 1.8kHz (SSB narrow) filters. Fig. 11 graphically illustrates the difference between these filters in the 500Hz band.
Fig. 11: Comparison of optional CW filters (500Hz)
Whereas the TS-570 provided only a single slot for installing an optional filter, the TS-480 has two slots, meaning that two of the three filters can be installed at the same time. And the process of installation itself is quite easy: there is no need to remove the main unit, since the option installation unit has been designed to be separately removable. The photograph in Fig. 12 shows the option installation unit. This can be used to install not only these IF filters but also a high-stability TCXO SO-3 (0.5ppm, -10~+50C), which is optionally available. Fig. 12: Option installation unit
If you unclip the white connectors on either side and remove the screws that hold the board in place, you can independently remove the unit for installing the optional filters. Since the type of filter is recognized automatically, it does not matter in which order you install filters in the slots.
In addition to the basic TX/RX circuitry already described, the TS-480 is equipped with a number of auxiliary features of considerable practical benefit. What follows is an introduction to some of these.
Full compatibility with digital modes (data modes)
PSK31 and RTTY operations can now be performed with ease using PC software. The TS-480 has been designed to make it easy to use such digital modes. External audio input/output terminals, separate from the mic and speaker terminals, are provided. For each of these the level can be adjusted in ten steps. You can select special AF DSP filters for use with digital modes. Specially provided for PSK31 use is the choice of either a 1000Hz or 1500Hz beat frequency. With the optional CW filters installed, you can choose between them even during SSB reception, which we have had many requests for. It is possible to switch the VOX function so that it will respond either to mic input or to an external audio signal. No special standby wiring is needed for making digital use of this VOX function. When transmitting voice with PTT, external input signals are muted. Conversely, when transmitting using an external input, the mic input is muted; thanks to this feature, there is no need to disconnect the mic during digital mode operations. (Note that if you put an external input on standby using the mic PTT, it will not be modulated; sometimes users have queried as a possible fault, but it is not.)
Ideal for mobile operations: DNL
Calculation of amplitude variation
Removal of DC component
Derivation of attenuation coefficient
First, the input signal is divided into its low- and high-frequency components. Ignition and other pulse noise tends to be concentrated in the latter, from which amplitude variation is output. The attenuation coefficient derived from this signal is multiplied by the input signal. As soon as pulse noise occurs, the attenuation coefficient rises instantaneously, thus damping the amplitude variation in the input signal. Because of this adaptive processing performed by the DNL and based on the amplitude variation, the output signal has virtually none of the digital feel that is often the mark of digital signal processing. It is perhaps only natural to associate this DNL with the old noise limiter technology, but as explained it works on a completely different principle, performing the sort of advanced processing that is only possible with DSP. Because the TS-480 will be often used for mobile operations, DNL parameters have been tuned so as to have maximum effect on ignition noise. However, even when used as a fixed station, it can be very effective on irregular, unanticipated noise, so we recommend that you try making use of it, in combination with the noise blanker as well. Fig.14 demonstrates how ignition noise is reduced by the DNL. Fig. 14: The effect of DNL on ignition noise
The DNL works in SSB, CW, FSK and AM modes, and it can be used in conjunction with other interference reduction and noise elimination features.
There are two methods available for noise reduction: NR1 and NR2. NR1 is a line enhancer that employs adaptive filter technology. By shaping a filter that lets through signals with a certain amount of periodicity, as with voice and CW, it can suppress noise that falls outside the passband. NR2 employs what is known as SPAC (speech processing by auto correlation) technology. What results from looping one cycle of the RX signals autocorrelation coefficient is then output as the received audio. What this means is that only periodic signals found in the received audio emerge. In principle this approach can result in a small amount of noise at the seam where the periodic signal is looped together, but in practice it proves extremely effective at noise compression. NR1 is a good choice for SSB and other audio signals, while NR2 is especially effective when used with single frequencies, as with a CW signal. Figs. 15~17 demonstrate the effect of applying NR1 and NR2. For comparison purposes, the same weak sine signal was received, with the audio output monitored by an FFT analyzer.
Fig. 15: NR OFF
Fig. 16: NR1 ON
Fig. 17: NR2 ON
Beat cancel (BC), as its name implies, is designed to cancel unpleasant beat interference. Like NR1, it uses adaptive filter technology, tracking a beat and canceling it by shaping. It is very similar to a band elimination filter. Even if there are multiple beats, BC can track and cancel them all. However, since BC operates at the AF stage, should powerful beat interference be experienced during DX operations, even though beat cancel works properly, by then the AGC has already attenuated both the interference and the target signal. To combat this sort of beat, IF shift is used to eliminate the interference. Figs. 18 and 19 show how BC cancels beat signals, as monitored by an FFT analyzer. You can see how the three beats present in the signal are removed with almost surgical precision. Fig. 18: BC OFF
Fig. 19: BC ON
There are two methods available for beat cancellation: BC1 and BC2. These have been tuned so that BC1 is effective against weak or continuous beat interference, while BC2 cancels intermittent beat such as a CW Morse signal. (Note that since BC is designed to remove the beat, and does not function in CW mode.)
RX DSP filters
In SSB, AM and FM modes, you can independently set high- and low-cut frequencies for the AF filters to suit operating conditions (slope tune). Fig. 20 illustrates how slope tune works. When there are interfering signals in proximity to the target signal, you can use a high-cut filter and a low-cut filter to remove the signals above and below the target. In SSB mode, installing the optional SSB narrow filter results in even better interference reduction. In AM mode if you select NAR, RX is possible using this SSB IF filter.
Target signal Low-cut Hi-cut
Fig. 20: Slope tune in action Listed below are the cutoff frequencies (unit: Hz) that can be chosen; default values are shown in bold.
SSB/FM Low-cut Hi-cut AM Low-cut Hi-cut
In CW and FSK modes, the AF filters function as a VBT, changing bandwidth without altering the center frequency. In CW mode, the center frequency is coupled to the CW pitch, whereas in FSK mode it is determined by the FSK tone and FSK shift frequencies. Fig. 21 shows how it is possible during CW operations to extract a target signal from surrounding interference by changing the AF filter bandwidth (WIDTH).
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. The internal antenna tuner can also be used during RX. Depending on conditions, sensitivity can vary by enough to see a change in the S-meter. It can also reduce low-frequency interference. If you own an AT-300, you can connect it to the TS-480; however, operation is limited by the capabilities of the AT-300. You can control the linear amp independently for the HF and 50MHz bands. And if the amp is not compatible with full break-in, you can add in a delay for the TX attack. With the VGS-1 Voice Guide and storage unit installed, you can engage constant record for the RX signal. Maximum playback time is 30 seconds. This is not just for contest CQ machines; it can be used as a simple beacon. Interval time can be adjusted up to a maximum of 60 seconds.
Repeat playback of voice/CW messages Interval time for #31
Keying priority over playback CW RX pitch / TX sidetone frequency
FSK 43 FM 44
CW keying weight ratio Reverse CW keying auto weight ratio Bug key function Swap dot & dash paddle position Auto CW TX in SSB mode Define CW tune frequency FSK shift FSK keying polarity FSK tone frequency Mic gain for FM Filter bandwidth for data communications AF input level for data connector AF output level for data connector
Without switching off the repeat playback for messages, you can start keying. Select RX pitch frequency between 400Hz and 1000Hz. At the same time, sidetone frequency changes with the pitch frequency. This can be used to zero in on a target signal by matching the sidetone frequency with the RX beat. Change the dot/dash weight ratio. This is usually set to AUTO. You can change the AUTO setting for #35. Manual TX can be enabled for dashes only. Swap the paddle position to suit either right-handed or left-handed use. Automatically switch mode to CW transmission by simply operating the paddle. Useful if used in combination with #39, as there is no need to operate the dial to zero in on a target. Standard FSK operating parameters are covered by these menus.
You can adjust FM mic gain (3 levels) This enables you to pick the appropriate DSP filter for data communications using the filter switch on the control panel. Adjust input and output levels independently when the TS-480 is connected to a SoundBlaster card or other external device.
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.
Making menus easier to use
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. To solve this problem, the TS-480 offers two sets of menus: A and B. 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.
The TS-480 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.
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. Figs. 23~25 illustrate the arrangement of these units.
Relay unit Final unit
TX /RX unit Fig.23: View from above (both models)
Fig.24: View from below (TS-480HX)
Final /AT unit
Fig.25: View from below (TS-480SAT)
Fig. 27: Upper side Fig. 28: Underside
Fig. 29: Fin
The air that is sucked in from the front is divided into two flows, one through the top of the chassis and the other through the bottom. The upper flow of air must pass through these high-efficiency cooling fins, absorbing the heat from them before it is expelled to the outside. These fins, which also serve as a partition between the TXRX unit and the filter unit, are set diagonally so as to offer a degree of shielding.
Now lets have a look at the rise in temperature of the different parts when the TS-480HX transmits continuously (14MHz) for 30 minutes at 200W. To provide a comparison, plotted on the same graph is test data compiled for a compact 100W model (designed so as not to power-down during continuous transmission at 100W). Fig. 30: Temperature rise around final transistors
Fig. 31: Temperature rise of die-cast aluminum chassis around GND terminal on rear
Fig. 32: Temperature rise measured at center of the upper case of the main unit
As you will appreciate from these results, despite the fact that the TS-480HX has an output of 200W, twice that of the comparison model, it boasts the same or even better cooling performance. It is not only designed not to power-down (for temperature protection) during continuous, normal transmission, but you can see that we have taken into full consideration the rise in temperature that occurs during continuous transmission. Despite the fact that the TS-480 Series is compact, it has the same heavy-duty specifications as the previous, fixed station model. Nevertheless, electronic components, whether from Kenwood or another manufacturer, are generally susceptible to heat: the higher the temperature, the shorter is their working life. Therefore, in order that you can use the product for a long time, we recommend that you adjust output to suit conditions.
In the compact size range, virtually all transceivers are designed so the control panel can be removed and replaced. While this is convenient, owing to the small dimensions of the main unit, the area of the front panel is necessarily limited. Consequently, in order to access the many functions that are used in HF operations using only a limited number of switches, hierarchical menus are unavoidable. As explained in the section on development objectives, we started out with the premise that the TS-480 would not be limited to mobile applications but that it would be able to serve as a reasonably priced 200W fixed station. So rather than going for a simple appearance, we decided on a standalone control panel in order to provide true operating ease. By separating the control panel from the main unit, its size can be decided independently of the cross-sectional area of the main unit. As a result, we were able to realize just about the same operability as one would expect of a conventional base station. Naturally, at the same time we adopted a large TN LCD, thus ensuring a responsive, easy-to-view display. For the main encoder, we picked a magnetic encoder with 250-pulse resolution made by Copal Electronics Corp., using software to quadruple resolution to 1000 pulses per revolution. Since this encoder uses the same components used in virtually all of the models in Kenwoods HF fixed station lineup, even during mobile operations it should offer the same operability as during fixed station operations. In addition, by ringing the main encoded dial with rubber we have further improved operating ease, since it provides a good grip and is more pleasing to the touch. In addition, installed inside this standalone panel is a 66mm-diameter speaker. Since the speaker grill is on the rear of the panel, you might wonder whether it can deliver sufficient volume. However, when you are actually using the standalone panel, you will find that the sound is reflected off your desk, the dashboard of your car, or the windshield, that is indeed loud enough.
New Option: ARHP-10 (Amateur Radio Host Program) Freeware
ARHP-10 is the host application for use with the Kenwood Network Command System. As was explained in the section on ARCP-480, if ARHP-10 is installed on the host computer it can serve as the host in a KNS connection. 1. Make an audio/voice cable & connect the TS-480 to your PC To conduct voice communications you require a PC with the Windows 2000 operating system or a later Windows OS, but in addition you need to connect the transceiver to the PC with an audio cable. Kenwood does not supply a cable for this purpose so you must make up one by yourself. When doing this, please refer to the wiring diagram on the right. Illustrated here is the wiring diagram for a cable that uses the DATA connector. It is also possible to make up a cable that uses the MIC terminal; to make such a cable, you will need a RJ-45 crimp tool to attach the connector. For the MIC terminal wiring diagram, please refer to the instruction manual. If using the MIC terminal, you will need a cable in order to hear the audio received by the TS-480; this connects the transceivers EXT-SP terminal to the input terminal on the PC sound card. 2. Checking LAN settings In order to operate KNS, you must first check the correct settings (operating system, home LAN devices). In regards to a LAN, by ensuring that each device is set up correctly, communications should be possible; however, if the connection is made via a WAN, one can suppose that as a result of various network problems, commands and/or voice may not get through properly. Even in such cases, you may find that the problem can be solved by changing the network device settings. Depending on the service offered by your Internet provider, you may find that you cannot obtain a global IP address or that commands and/or voice are not getting through. Also, if you are using a router to access the Internet, in addition to opening the command port for sending and receiving with TCP, if the router is compatible with Microsoft NetMeeting, by making the appropriate port open setting it should be possible to conduct voice communications when KNS is active. Be sure to read carefully the instruction manual before changing the settings on any network device. You do so at your own risk.
3. Adjust PC volume Whether hosting via a WAN or within a LAN, it is recommended that you test your setup at least once using a KNS environment arranged with host and remote on the same LAN. This should allow you to adjust volume to the appropriate level. To adjust terminal level, display the recording control, confirm that MIC input is selected, and adjust the level. For speaker output level adjustment, adjust WAVE. 4. User setup Open the setup window and set the COM port to be used for commands, whether or not to use voice communications, session time, and whether or not to keep a log. By clicking on Add, you can then input the name and password of the user to connect. The host administrator then informs the remote PC user of the above user name and password, as well as other relevant information such as how to make up an audio cable (for use with either the DATA terminal or MIC/EXP-SP). The remote PC user can then connect to this host using the information provided. Note that a red X mark within the user frame indicates that this user is temporarily barred from connecting to the host. After the setup is completed, you can return to the main window and click on CON; the button will then appear yellow. This completes the setup: the host is now ready for the remote PC user to make a connection. Once the audio cable has been made up, connect the various cables to your PC as illustrated below. In addition, connect your PC to the TS-480 with an RS-232 cable.
KNS will probably work with your firewall, provided that it is set up for the ports required by ARCP and ARHP to be open. Set the TOT to whatever duration you require. However, since this simply times your transmission, once the time is up, it will return the transceiver to RX even if you are in the middle of transmission. There is a delay with KNS. If you are using a WAN, this delay increases, so it is not suitable for the various types of digital communications or other operations that demand a quick response. It is also not recommended if audio quality is a priority. 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.
Sound Problem The sound does not get through (host PC). Solution First check that the audio cable is connected properly. Check what audio input method (MIC/EXP-SP or DATA) has been selected for the transceiver. If the DATA terminal is used: Use menus #46 & #47 to check that I/O levels are correct. If MIC/EXT-SP is used: Check that AF level and mic gain are correct. Check your computer: Check that the computer can produce sound; update drivers as necessary. Connect the transceivers RX audio to the input of your computer and bring up the recording control window. Check that the input terminal you are using is active and that it is set to an appropriate level. Bring up the playback control window; make sure that it is not muted and that it is set to an appropriate level. Check that you can hear something from the speakers connected to your computer. After you have completed these checks, mute the PC output. Check that you are using a compatible operating system. Check that Voice is checked in the ARHP-10 setup window. If using a WAN, check that KNS will work locally over your LAN. If using a WAN, check your communications hardware and ISP settings. (If you are using a router, try removing it temporarily to see if that makes a difference.) Check that KNS VOICE is illuminated in the ARCP-480 display. If it is not, recheck your operating system for compatibility and also your network settings (including your ISP service). First check that the host audio is connected properly. Check what audio input method (MIC/EXP-SP or DATA) has been selected for the transceiver on the host side. If the DATA terminal is used: Use menus #46 & #47 to check that I/O levels are correct. (Normally, there would be no need for the remote PC user to think about this.) If MIC/EXT-SP is used: Check that AF level and mic gain are correct. Check your computer:
The sound does not get through (remote PC).
Check that the computer can produce sound; update drivers as necessary. Connect a microphone to the computer and bring up the recording control window. Check that the input terminal you are using is active and that it is set to an appropriate level. Bring up the playback control window; make sure that it is not muted and that it is set to an appropriate level. Check that you can hear something from the speakers connected to your computer. Check that you are using a compatible operating system. Check that Voice is checked in the ARHP-10 setup window on the host computer. Check that KNS VOICE is illuminated in the ARCP-480 display. If it is not, recheck the host computer operating system for compatibility and also the network settings (including the ISP service for the host computer). If using a WAN, check that KNS will work locally over your LAN. If using a WAN, check your communications hardware and ISP settings. (If you are using a router, try removing it temporarily to see if that makes a difference.) Check that Voice is checked in the ARCP setup window. Check the modulation line. Check that the host PC audio cable connection method in the TX Control frame of the Setup window is the same. TX/RX audio breaks up, is distorted or faint. Bring up the playback and recording control windows on both host and remote computers and try adjusting the levels. If the RX audio seems faint, and if the Line-in terminal is being used for input on the host computer, try switching to the Mic-in terminal. If modulation seems faint during TX, and if the Line-out terminal is being used for output on the host computer, try switching to the Speaker-out terminal.
TS-480 In-Depth Manual
Published in April 2004 by Kenwood Corporation Communications Equipment Division Unauthorized reproduction is forbidden. Copyright 2004 KENWOOD CORPORATION
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