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-NOVEMBER NEWS LETTER



Isotron 160/80
Not enough real estate? Problem solved!
 
 
The best way to operate HF
Easy installation
Excellent performance
Durable construction
CC&R Friendly (XYL also)
 
FYI: The HF bands are opening nicely. It is a good time to get set up for 20 to 10 meters.
 
AM RECEPTION
Last article was on Amplitude Modulation transmission. What is needed to receive this type of signal?
 
It is very basic. The Audio is carried through the air on the Radio Frequency you are operating at. We were using 7.200 MHz. Tuning to this frequency with your receiver, the radio is filtering out the carrier and leaving the audio for you to hear.
Some of us old melons may remember the AM radios that required no power. As long as you had a strong AM signal you could hear it.
 
This little device consisted of a tuned circuit, attached to a wire for an antenna, a small germanium diode, a capacitor and some ear phones.
 
The diode changed the RF current (7.200) to a direct current (DC). The capacitor filtered that current so the RF was a steady DC signal. Like the RF signal you can not hear it, but it leaves the audio signal still on the line. Put a set of ear phones to this circuit and you are in business.
 
Your big fancy radio is doing similar on AM. It has a few added features, like a variety of amplifiers and mixers to make tuning very selective. The audio can be played through a speaker rather than head phones.
 
One advantage to Amplitude Modulation is the clarity it offers. One of the reasons AM Broadcast is still popular. It is still used on the VHF aircraft frequencies. Why use it there?
 
Using AM takes less space than the usual Frequency Modulated (FM) signals. More useable frequency is available. On the other hand on the HF spectrum, AM uses more of the spectrum than Single Side band.
 
Next article will give some basics on the Single Side Band mode.
 
73,
Ralph WD0EJA
 
NOV 2021
 
14-11
BILAL COMPANY
137 MANCHESTER DR.
FLORISSANT, CO. 80816 U.S.A
PH/FX: 719/687-0650
 
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