Ham Radio 对讲机

I bought Yaesu Vertex VX-150 VHF FM Transceiver from the Ham Radio Outlet in May 2009. There address is:

510 Lawrence Expy # 102, Sunnyvale, CA 94085 (408) 736-9496

The radio is $99.95 after $20 MFR discount. There are some discussions about VX-150 vs. VX-170. I listed the difference after my research:

It seems that the Yaesu Vertex VX-150 VHF FM Transceiver is favorite radio in hanggliding community.

Battery Life Test:

1400mAh: 25 hours. 3:45 PM -- 11:45PM (8 hours), 7:30AM -- 12:30AM(17 hours). in room temperature, with low speaker volume.

2000mAh: 36 hours. 10:51AM -- 10:51AM next day - 12:00AM next day and died sometime in the early morning!

===================== HAM TEST ==================

Ham Radio

http://www.qrz.com/xtest2.html?

QRA?     What is the name (callsign) of your station? 

QRG?     Will you tell me my exact frequency (or that of ........)?

QRH?     Does my frequency vary?

QRI?       How is the tone of my transmission?

QRK?     What is the readibility of my signals (or those of........)?

QRL?      Are you busy?

QRM?     Are you being interfered with?

QRN?     Are you being troubled by static?

QRQ?     Shall I send faster?

QRS?      Shall I send slowly?

QRT?      Are you going to close down?

QRU?     Have you anything for me?

QRV?     Are you ready?

QRW?    Shall I inform ..........that you are calling him on ........MHz.

QRX?     When will you call me again?

QRZ?     Who is calling me?

QSA?     What is my signal strength?

QSB?      Are my signals fading?

QSL?      Can you acknowledge receipt?

QSO?     Can you communicate with .......... direct or by relay? 

QSU?     Shall I send or reply on this frequency (or on ........MHz by,.........mode)?

QSV?     Shall I send a series of 'V'?

QSW?    Will you send on ........MHz by ...........mode?

QSX?     Will you listen to ........... on .........MHz?

QSY?     Shall I change my frequency?

QTC?     How many telegrams have you to send?

QTH?     What is your location?

QTR?     What is the correct time?

QUM?     Is the distress traffic ended?

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APRS    Automatic Position Reporting System.

RIT    Receiver Incremental Tuning

PSK    Phase Shift Keying.

CQ    is an invitation for any operators listening on that frequency to respond.

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Satellite sub-band on 70-cm: 435 - 438

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Equation: f * λ = c 

where: 

f = frequency in Hertz (Hz = 1/sec) 

λ = wavelength in meters (m) 

c = the speed of light and is approximately equal to 3*108 m/s 

so: f (MHz) * m = 300

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Amateur Radio Band

6m    (6.000m - 5.556m) 50MHz - 54MHz

4m    (4.286m - 4.255m) 70MHz - 70.5MHz

2m    (2.083m - 2.027m) 144MHz - 148MHz

70cm (0.714m - 0.667m) 420MHz - 450MHz

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Q: What term is commonly used to describe the rapid fluttering sound sometimes heard from mobile stations that are moving while transmitting?

A: Picket fencing .

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Q:What, in general terms, is standing wave ratio (SWR)?

A:A measure of how well a load is matched to a transmitter.

==============

FCC OET Bulletin 65.

PEP: Peak Envelope Power

At all times, transmitter power must be the minimum necessary to carry out the desired communications. Unless otherwise noted, the maximum power output is 1500 watts PEP. Novice/Technicians are limited to 200 watts PEP on HF bands.

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Q:What is the normal bandwidth required for a conventional fast-scan TV transmission using combined video and audio on the 70-centimeter band?

A: 6MHz

Q: What is the impedance of the most commonly used coaxial cable in typical amateur radio installations?

A: 50 Ohms.

Q: What is the SWR value where the protection circuits in most solid-state transmitters begin to reduce transmitter power?

A: 2 to 1

Q: What emission mode may be used by a Technician class operator in the 219 - 220 MHz frequency range?

A: Point-to-point digital message forwarding.

Q: Which sideband is normally used for VHF and UHF SSB communications?

A: Upper sideband.

Q: What is PSK31?

A: A low-rate data transmission mode that works well in noisy conditions.

Q: Which of the bands available to Technician class licensees have mode restr cted sub-bands?

A: The 6-meter, 2-meter, and 1 1/4-meter bands.

Q: What is connected between the transceiver and computer terminal in a packet radio station?

A: Terminal Node Controller .

Q: What is a grid locator?

A: A letter-number designator assigned to a geographic location .

Q: What emission modes are permitted in the restricted sub-band at 50.0-50.1 MHz?

Q: What emission modes are permitted in the restricted sub-band at 144.0-144.1 MHz?

A: CW only

Q: What could be happening if another operator tells you he is hearing a variable high-pitched whine on the signals from your mobile transmitter?

A: The power wiring for your radio is picking up noise from the vehicle's electrical system.

Q: approximate bandwidth of a single-sideband voice signal?

A: 2-3K Hz

Q: What is a practical reason for being able to copy CW when using repeaters?

A: to recognize a repeater ID sent in Morse code.

Q: What is the preamble of a message?

A: The information needed to track the message as it passes through the amateur radio traffic handling system .