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If you're still getting loud squelch noise but do not receive on any channel, you must check the RF from the antenna to the audio stage(not included). There must be more than just one RF stage in this radio. Let me know what you find.
The FT-840 uses a die-cast RF power amp
with thermally switched fan to ensure full power output (up to 100
watts). The digitally synthesized local signals ensure clean, low-noise
transmitter output on all HF amateur band. There might be no AC line interference. it has strong Rf output. any AC line intersect does not affect its radio performance. Check and adjust RF power so to maintain proper output. some times more RF power generated at the output may cause interference. adjust Rf power..Even some unfiltered Noise getting the other end of the end may calso cause interference. Check for any Ripple voltages present at the output. Contact authorised service station for further Rectification. thank you shanth
The RF limits the signal strength you radio receives. After setting the RF to limit excessive signals, then set your squelch up until the noise is gone. There are some areas which have high RF background noise so adjustments are made often while driving around. Use the ANL (automatic noise limiter) and other features also to control the noise.
Hope this helps I had same irratating problem 1. The RP200 is designed to automatically synchronize its calendar clock once it is brought within a range of 1500km of the Frankfurt DCF77 radio signal. When the RP200 is brought within this range, its auto-control mechanism will override all manual settings. 2. The clock automatically starts scanning the RF 433MHz signal after new batteries are inserted in the main unit. When receiving the RF 433MHz radio signal, the Radio Tower symbol starts to blink. A complete reception generally takes about 10 minutes, depending on the strength of the radio signal. 3. When the reception is complete, the Radio Tower symbol will stop blinking and remain solid 4. For an optimal reception, place the clock away from metal objects and electrical appliances (i.e. television, computer, monitor, etc) to minimize interference. Notes: • The unit will receive the RCC signals every day at 2am. • The RCC signal can also be triggered by holding the key for 2 seconds in time mode. • When the unit is searching or receiving the RCC signal (which lasts about 5 minutes), none of the keys is working except the key. • Press and hold the key for 2 seconds if you wish to stop to the RCC signal search. If the RP200 is brought outside the range of the Frankfurt DCF77 radio signal or if the signal is interfered, please set the time and date manually according to the instructions below. If the unit is located within the radio-controlled range, you may want to customize some of the clock settings. Note: When no key is pressed for more than one minute, the unit returns to time mode (time, date and temperature display World Time Clock This function allows you to adjust the clock to a time zone. It is particularly useful for travelers. Set the clock to the city you are located in, or to a city in the same time zone. 1. In time mode, press [MODE] twice to select the world time clock. 2. Press the key to select the city in which you are located. 3. Press to adjust the summer saving time function. 4. Press and hold [SET] to set the world time as the local time. When the local time is the same as the world time, the icon flashes.
The Sentry Key Immobilizer Module contains a Radio Frequency (RF) transceiver and a microprocessor. The SKIM transmits RF signals to, and receives RF signals from the Sentry Key transponder through a tuned antenna ring integral to the SKIM housing. When the ignition switch is turned to the On position, the SKIM transmits an RF signal to the transponder in the ignition key. The SKIM then waits for an RF signal response from the transponder. If the response received identifies the key as valid, the SKIM sends a valid key message to the PCM over the PCI data bus. If the response received identifies the key as invalid, or if no response is received from the key transponder, the SKIM sends an invalid key message to the PCM. The PCM will enable or disable engine operation based upon the status of the SKIM messages.
Most DirecTV receivers are able to be controlled with IR (infrared) or RF (Radio Frequency) signals. DirecTV receivers are usually set to be controlled by RF.
To control a DirecTV PVR / Satellite, it needs to be set to respond to an IR Remote: 1. On the original DirecTV remote press the Menu button 2. From the Menu press Select on Settings 3. Select Remote from the left menu 4. Press Select on the IR/RF Setup button 5. Use the Up or Down arrows to change from RF to IR 6. Press Select to save
Note: Some models of DirecTV may have different steps to enable IR. You may need to refer to your user manual
Harmony Remotes only control IR signals. so this is not the issue. The Harmony Remote should control the tv. the original remotr needs to be tested for IR or RF.
The device we are working on that is not being controlled by the Harmony Remote could be operating on RF (Radio Frequency) signals. Harmony Remote can only control the devices that operate on IR (Infrared) signals. Most devices that work on RF signals can be changed to operate on IR signals, and this usually could be done by changing the remote control command mode to IR from RF.
Please follow the steps listed below to test to see if the device is being operated on RF or IR signal: 1- We need to use the original remote for that device to complete this task 2- Using your hand or a thick and wide object (wall, pillow, book...), cover the top part of the original remote. In other words block the direct positioning between the original remote and the device. 3- After you cover the top part of the original remote (or used an alternate way to block the direct communication of the original remote and the device), try pressing the buttons on the original remote to see if it can still send commands that can be received by the original remote. You can try powering on/off your device using the original remote when the original remote is being blocked by your hand or another object. 4- If you still can control the device using the original remote without a point of sight, your device is being operated on RF signals. If you cannot control the device without a point of sight, then it is IR operated. 5- If the device is RF operated, please change the command receiving mode to IR rather than RF and test the Harmony Remote. 6- If the device is IR operated, please contact us again by replying to this email and let us know if none of the commands or some certain commands are not working for that device.
You can usually find the information on how to switch the device to be operated on IR signals rather than RF signals, through the user manual for your device, or by contacting technical support of the manufacturer for that device, or even sometimes reaching the information simply by doing a basic research over the internet.
Before you call a doctor or an exorcist, verify that you're using your shortwave receiver under normal condition. There are several factors which affects reception of whortwave programs and signals.
1. Check for the time and frequencies. Depending on your country and location, all Shortwave time zones are based on World Time in UTC or GMT ("Universal Time Coordinates" or Greenwich Mean Time") In my country (Philippines, Asia) for example, we are 8 hours advanced from World Time. You can check your time zones and regions using a world map.
2. Check for propagation and band conditions/ openings. During daytime higher frequencies such as 9 -21 Mhz are active, while nightime frequencies are the lower bands such as 3 - 9 Mhz. Daytime and nigthime divider frequency is about 10 Mhz, that means you might receive signals under most conditions during daytime and night time. Check some technical books on amateur radio operations or magazines for radio reception. It might be worthwile to study books or materials on receiving international broadcasts stations before you can receive good or adequate shortwave signals. This might become your hobby too, "DXing" or receiving distant stations from across the world. Try it, but it might be an addicting hobby once you're drawn to it!
3. Check if any shortwave station broadcast in any specific time of day at any frequency. Shortwave broadcasts are scheduled based on band openings mentioned above. If for example I'm a Shortwave broadcaster from Asia, and would like to broadcast my signal through the Americas, I would use band openings with respect with time zones. If it is night time in the Philippines, and daytime in the Canada, I would use the higher frequencies to propagate my signal. So I would specify the time for example "8:00 pm Philippine local time, 12 hours UTC, and 7 am in Canada"--- Asia: 8 hours advanced to UTC, Canada--- 5 hours behind to UTC). So shortwave broadcast schedules varies. Broadcast schedules are available on the net, just search for the Shortwave station you want to hear such as Radio, Japan, Radio Australia, BBC, DW (Deutche Welle) Radio in Germany, China Radio International... There's too many shortwave stations waiting to be discovered out there! Check some books and magazines too such as Popular Communications, Monitoring Times, Passport to World Band Radios, World Radio and TV Handbook, etc. You may want to check if any station would be broadcasting in your dialects as most of these mainstream and regular broadcasters are multilingual.
2. Check your location. If you are using your radio indoors, shortwave signals might not entering your homes or offices due concrete walls and metal railings or fence. There are many factors which blocks radio waves especially in the HF or lowetr bands. Try receiving AM (Mediumwave) first. If it cannot receive any AM station, then you would not receive any Shortwave signal at all, even if you extend fully the telescopic whip. If you cannot receive AM or Shortwave signal indoors, try using your receiver outdoors.
2. Check for local interference. Your receiver might be receiving interference from noise generating gadgets such as PC monitors, TV sets, faulty wall adapters or switching power supplies, motor operated appliances such as washing machines or vacuum cleaners, flourescent lamps, etc. Try turning off or unplugging each of these mentioned gadgets to see if they are the cause. Faulty house wiring or powerline noise might also cause some interference noise which could drown shortwave signals, verify this with your local electrical technicians.
3. Check your radio's settings. Depending on the radio that you use, there might be settings such as attenuator or RF gain, be sure that attenuator are set to zero or turned to off, and RF gain to high. Attenuator must be turned to minimum or OFF position, unless you are receiving too much signas from nearby radio stations. Setting attenuator to mid or high position will attenuate most weak signal, and only those strong local stations will pass through. Setting too much attenuation will prevent you from receiving any station at all. Same with RF Gain, always set it to highest gain setting unless you are receiving too much signals which might overloads your shortwave radio.
4. If these troubleshooting efforts above doesn't works and you still cannot receive any station, then your radio's front end parts might had burn out due to signal overloads. Burn parts might include one or several transistors or diodes. Let your local service technicians check your radio and solve the problem for you. If your radio is still under warranty, send it back to the store or dealer, and let a qualified technician do the repair.
MANNY DE GUZMAN JR.
SoundMagik Home Studio
Site Creator, Teen Models 2007
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