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You tune to a clear frequency. The reason that you check that it is not in use by asking on the frequency is:
The station currently transmitting may not be audible to you but the station he is working may be in range of you QTH and there is a chance of mutual interference.
Someone may be monitoring the frequency because he has a regular schedule with another station and wants to stop you using the frequency
you may cause interferance to other stations on the frequency who cannot hear you
the frequncy may be in use by a narrow band data station that you cannot hear
The reason for moving off a calling channel when you have established contact is:
To stop someone listening to your conversion
To use you antenna more efficiently
This leaves the calling channel free for someone else to find a contact
To move to a section of the band which is designated for your mode of transmission
Which of these uses the recommended phonetic alphabet for G3ZPD
George 3 zulu papa delta
Golf 3 zero potential difference
Guatamala 3 Zanzibar Portugal Denmark
Gold 3 zulu papa delta
To set up a contact through a repeater you would need to set all of these except
The repeater shift
The power
The access tone or CTCSS
The bandwidth of the signal
If connecting a TNC output to the microphne input of a transceiver it is important to:
set the AF gain to zero
turn on the speech processor
setthe AF gain to a level that does not overdrive the transmitter