Presentation on theme: "G. West Your First Radio p. 73 Your Computer goes Digital p. 119 Multi-mode Radio Excitement p. 127 Run Some Interference Protection p. 137 G. West Your."— Presentation transcript:
G. West Your First Radio p. 73 Your Computer goes Digital p. 119 Multi-mode Radio Excitement p. 127 Run Some Interference Protection p. 137 G. West Your First Radio p. 73 Your Computer goes Digital p. 119 Multi-mode Radio Excitement p. 127 Run Some Interference Protection p. 137
Amateur Radio equipment G. West Your First Radio p. 73 Your Computer goes Digital p. 119 Multi-mode Radio Excitement p. 127 Run Some Interference Protection p. 137 ARRL: Ch. 2.3, 3.3, 5
Generalized Transceiver Categories Single BandVHF or UHF FM Dual BandVHF/UHFFM MultimodeVHF/UHF MultibandHF and VHF/UHF Handheld (HT)
Basic Station Organization Station Equipment –Receiver –Transmitter –Antenna –Power Supply Accessory Station Equipment
What Happens During Radio Communication? Transmitting (sending a signal): –Information is converted to electronic form. Transmitter Info
What Happens During Radio Communication? Receiving end: Receiver front end Receiver front end
Demodulator Detector Modulator Filters Mixer Amplifier Oscillator Produces a steady signal at a single frequency Makes signals stronger Converts a radio signal from one frequency to another. T7A03 Removes information from modulated RF Removes or blocks unwanted signals Puts information on the RF signal T7A08 Product Detector Detects CW & SSB Frequency Discriminator Removes information from FM signals Converts modulated RF directly into data or voice T7A05 Our Basic Building Blocks
Transmitter Receiver Transceiver Power Supply Power Supply TR Switch TR Switch Antenna T7A02 A transceiver combines the functions of a transmitter and a receiver
The Superheterodyne Receiver Block Diagram The mixer combines two signals to To convert one frequency to another, T7A03 One mixer = single conversion Two mixers = double conversion
Mode Select Band select VFO, Tuning Knob, T4B02 Used for frequency entry T4Bo4 Memory controls Quick access to favorite frequencies. Microphone connector T4A01 Some include PTT and mic voltage.
Notch filter RIT Receive incremental tuning T4B07. change receive freq. Noise blanker T4B05, Help to eliminate noise Antenna tuner Squelch T2B03, T4B03 Mutes receiver output when no signal. T4B09 Filters, 2.4 kHz for SSB T4B10 500 Hz for CW T4B08 Some variable. Carrier Squelch – Mutes the receiver audio by the presence or absence of a RF signal. T2B03
Squelch Memory or VFO operation F + Select type of tone Tuning control F + Select tone frequency Microphone Select memory CH or Frequency Direct frequency entry In VFO operation ARO Automatic Repeater Offset T7A10 An RF power amp can be used to increase power out “PTT” Push to talk T7A07
Extra battery packs. Drop-in, fast charger. Extended antenna. External microphone and speaker. Headset.
Selectivity / Sensitivity Selectivity – The receivers ability to Discriminate between multiple signals. T7A04 Sensitivity – The ability to receive and detect the presence of a signal. T7A01
Increase Sensitivity Receiver Pre Amplifier Pre Amplifier T7A11
HF Transceiver On 28 MHz HF Transceiver On 28 MHz Transverter 222 MHz Transverter 222 MHz 28 MHz in and out 222MHz Transverter is used to extend the the frequency Capabilities of a HF transceiver. Transverter is used to extend the the frequency Capabilities of a HF transceiver. Example 1: A Transverter is being used to allow the HF transceiver to operate on the 222MHz band. Antenna connection Transverter T7A06
Amateur Radio Station Good station practice. Ensure your station is not producing interference.
Part 15 rules, Covers un-Licensed devices that use RF communications. May not cause interference to licensed equipment Must accept interference caused by licensed equipment operating properly under FCC rules
T7B04 Overload by amateur to telephone, RF Filter T7B05 Overload by amateur
22 T7B08 What should you do if a "Part 15" device in your neighbor’s home is causing harmful interference to your amateur station? A. Work with your neighbor to identify the offending device B. Politely inform your neighbor about the rules that require him to stop using the device if it causes interference C. Check your station and make sure it meets the standards of good amateur practice D. All of these choices are correct
T7B12 What might be the first step to resolve cable TV interference from your ham radio transmission? A.Add a low pass filter to the TV antenna input B. Add a high pass filter to the TV antenna input C. Add a preamplifier to the TV antenna input D. Be sure all TV coaxial connectors are installed properly (D)
Packet PSK31 MFSK RTTY Protocol Keyboard to Keyboard Many of the digital modes use error detection and correction. T8D11 ARQ. Automatic Repeat Request T8D08 Packet includes in the transmission Check Sum for error detection Header for sender and receiver information Automatic repeat request in case of errors. ✔ A method for encoding, packaging, exchanging, and decoding digital signals
Most popular in the HF Bands Found at the bottom of the bands just above CW PSK31 most used mode on HF. Phase Shift Keying 31 baud T8D06 Sends Data at a slow rate T8D07
Automatic Packet Reporting System T8D02 Basically a packet station connected to a GPS Global Positioning System T8D03
28 T8D09 The code used when sending CW in the amateur bands is International Morse. T8D10 The following devices can be used to transmit CW in the amateur bands: Straight Key Electronic Keyer Computer Keyboard
T4A06 TNC connects computer with radio T4A07 An interface is needed if connected directly to sound card
T8C11 A gateway is used to connect other amateur radio stations to the internet
T6D05 A regulator is part of a power supply to maintain a stable voltage. T4A03 Voltage fluctuations are prevented form entering radio equipment. T5A06 Mobile radio equipment uses a 12 volt power source. T4A11 A fused connection in both the positive and negative leads should be connected directly to the vehicle's battery. A power supply is a device that supplies electrical energy to one or more electric loads.
T2C02 A 12V. vehicle battery can be charged by connecting it to a vehicle battery, and running the vehicle. T0A09 A lead acid vehicle battery can produce explosive hydrogen gas while being charged. T0A10 A vehicle battery can get hot and give off hydrogen gas if charged, or discharged too quickly.
Power GroundRF Ground Safety Ground Wall Outlets Tools Keeping all station equipment at the same RF voltage Audio distortion RF Burns Erratic computer operation T7B11 RF feedback can cause distorted transmit audio
Connect all radio equipment to a common bus. Connect the bus to a good earth ground. Solid copper strap is best for grounding. T4A08 Keep Connections short.
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37 T4A04 Where must a filter be installed to reduce harmonic emissions? A. Between the transmitter and the antenna B. Between the receiver and the transmitter C. At the station power supply D. At the microphone
38 T4A08 Which type of conductor is best to use for RF grounding? A. Round stranded wire B. Round copper-clad steel wire C. Twisted-pair cable D. Flat strap
39 T4A09 Which would you use to reduce RF current flowing on the shield of an audio cable? A. Band-pass filter B. Low-pass filter C. Preamplifier D. Ferrite choke
40 T4A10 What is the source of a high-pitched whine that varies with engine speed in a mobile transceiver’s receive audio? A. The ignition system B. The alternator C. The electric fuel pump D. Anti-lock braking system controllers