Members Articles

3 BAND EQ + ECHO FX + BUILT IN AUTOMATIC MORSE CODE KEYER

By Edwin B. Sumalpong Jr., DU8CCG
September 2021

As an audio enthusiast and a high school morse code fanatic, an idea was came into reality wherein I’ve built this module for enjoyment. With this module I can adjust the TX audio bandwidth of my transceiver, simple echo effects and playing morse code because it has a built in automatic morse code keyer/ code practice oscillator (CPO).

The module has three(3) concepts such as 3 Band EQ, Echo FX and Automatic morse code keyer.figure1 below depicts the module.,

(1). 3Band EQ for TX audio bandwidth adjustment and consist of LOW, MID and HIGH Frequencies, in which you can boost and/ cut specific equalizer band. Adjustment must be according to receiver / your QSO station preference. See figure 2 below

(2) Digital echo effects, basically it has delay and repeat knob adjustment, if set properly perhaps it will sound good and wherein receiver / listener perceive a repetition of words.Too much echoes sometimes annoying HI HI if not set properly. See figure3

(3)Automatic morse code keyer / code practice oscillator (CPO) with this integration could be an icing on a cake so to speak HI HI. It has speed adjustment (WPM-word per minute) which start at 5WPM for beginners like me., with this you can practice sending morse code directly to your transceiver at the same time listening it by plugging in external speaker / headset in this module / kit., I’ve tested it on Alinco DR130(2m band) using straight key and paddle key. Figure 4 and figure 4a

Figure4.

Figure4a

However, when sending directly to the transceiver a bypassed switch must enable to deactivate the handmic and it will activate the morse code keyer section. As a former NCS of southern Philippines association of radio communicators(SPARC8) Zamboanga city,this module could help in answering or replying to the station sending morse code during net call proper HI HI.

GRACIAS ‘73

Nonoy DU8CCG