The basics of scanning.

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The basics of scanning.

Postby m0lsx » Fri Nov 13, 2015 11:06 pm

We need a basics of scanning thread.
The following is a site that has images of the commonly used coax connectors.
http://www.buytwowayradios.com/blog/2014/01/two_way_radio_antenna_connector_types.aspx
Another good site for connectors..
http://knowledge.digi.com/articles/Knowledge_Base_Article/RF-Connector-Identification-Chart
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Re: The basics of scanning.

Postby m0lsx » Fri Nov 13, 2015 11:12 pm

Image

Image

Image
Last edited by m0lsx on Fri Nov 13, 2015 11:36 pm, edited 1 time in total.
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Re: The basics of scanning.

Postby m0lsx » Fri Nov 13, 2015 11:19 pm

Discone antennas come in different designs that include.

Image

Image

Image

The following is an example of what is called a double discone.
Image
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Re: The basics of scanning.

Postby m0lsx » Fri Nov 13, 2015 11:21 pm

The following are examples of what are called Collinear antennas, often referred to white stick antennas.

Image
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Re: The basics of scanning.

Postby m0lsx » Fri Nov 13, 2015 11:31 pm

Not all of us can put antennas outside.
Desk top antennas are available..
Image

Image

Or you could hang a antenna in the corner, a window or the loft..

Image
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Re: The basics of scanning.

Postby m0lsx » Fri Nov 13, 2015 11:43 pm

How do you fit coax or a antenna with one type of connector to a scanner with a different type of connector??
You can use a adaptor.

Image
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Re: The basics of scanning.

Postby Chainsaw » Sat Nov 14, 2015 5:00 pm

A nice post, very informative. :-)

That RG213 cable looks bloody thick stuff!

Cheers,

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Re: The basics of scanning.

Postby m0lsx » Sat Nov 14, 2015 5:02 pm

It's reasonably thick & stiff, but you should see what the broadcast industry uses at 100 mhz, if you think thats thick.
I will try & add to this & make it more informative.
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Re: The basics of scanning.

Postby m0lsx » Mon Apr 18, 2016 9:50 pm

Basic guide to Radio speak..
ULF= Ultra Low Frequency. From 3 to 30hz.
VLF= Very Low Frequency. 30hz to 30khz.
Low Frequency= includes the broadcast band Long Wave. 30khz to 300khz.
Medium Frequency= Medium Wave broadcast plus more. 300khz to 3MHz.
HF = High Frequency or Short Wave. 3 Mhz to 30MHz.
VHF = Very High Frequency. 30 to 300 MHz. Includes, airband, marine band & the broadcast VHF band among other things.
UHF = Ultra High Frequency. 300 to 3,000 MHz Includes Military Air & 446 licence free.
MHz= 1000 khz
GHZ = 1000 Mhz.
QTH = Location. The Q code can be used in a variety of ways. What is your QTH. My registered QTH (QTHR) is..etc etc.
QSB = Fade
QRM = Man made interference. ie. electrical noise, someone else using your frequency.
QRN = Natural interference. ie. natural noises.
QSL= A postcard like card exchanged to prove someone has heard you/you have heard, spoken directly with them. But could also mean I understand.
QSO = a two way conversation.
73 = Best Wishes..Note it is already plural. This is taken from the Western Union 1859 Radio Telegraphers 92 code.
SWL = Short Wave Listener.
DX = Distant.
Skip= what carries the radio signal.
Propagation = What produces the conditions to carry a signal.
Lift= Good propagation. That is conditions that make a radio signal travel further than it would normally & often much much further.
Last edited by m0lsx on Mon Apr 18, 2016 10:00 pm, edited 1 time in total.
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Re: The basics of scanning.

Postby m0lsx » Mon Apr 18, 2016 9:57 pm

Signal reports..
For a repeater, a signal is rated by it's strength into the repeater. Is it fully quietening?? That is does it bring any static hiss in with it??

For a two way signal or to rate the repeaters signal to us we use part of the old telegraphers RST code.
R = readability S= Strength. & T = Tone. But as we are not using morse, tone is immaterial. So we just use the other two.
R = READABILITY
1 -- Unreadable
2 -- Barely readable, occasional words distinguishable
3 -- Readable with considerable difficulty
4 -- Readable with practically no difficulty
5 -- Perfectly readable

S = SIGNAL STRENGTH
1 -- Faint signals, barely perceptible
2 -- Very weak signals
3 -- Weak signals
4 -- Fair signals
5 -- Fairly good signals
6 -- Good signals
7 -- Moderately strong signals
8 -- Strong signals
9 -- Extremely strong signals.
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