American QRP Club NUE-PSK Manuel de l'opérateur - Page 13

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common and is an artifact of the DSP process of the signal, and it will occur even

when viewing received signals a bit below or above the spectrum midpoint.

f) How We Tested the Modem (in part) – Some might find this info helpful in

testing their own modems. We had direct audio connections to a laptop running

Digipan, with the audio in/out cables connected to the soundcard headphone/mic

connectors, respectively. We then commanded the modem to transmit at 1500

Hz and viewed the classic two-tone "railroad track" signal on the Digipan waterfall

display.

Ensuring that the Digipan frequency (i.e., the red diamond) was

centered on the tracks to ensure we were tuned to the modem's signal, we

adjusted the Tx Audio level control fully counterclockwise to generate no signal,

then increased it slowly in a clockwise direction while viewing the IMD reading on

the Digipan window. We stopped turning the control when the IMD reading got to

a -54 dB level, after which turning it further has no more effect. We found this

level to be an ideal setting of the Tx Audio level delivered by the modem.

Characters typed on the modem keyboard could then be seen on the Digipan

receive window. We then turned the channel around (i.e., set Digipan to Tx and

the modem to Rx), and saw n the modem display the characters typed into

Digipan. [Note, you should follow the adjustment procedure elsewhere in this

manual when connected to a radio.]

12)

Technical Support

In case of questions or problems, feel free to send an email with your comments to us at

[email protected].

Be sure to also check the NUE-PSK website at

information, software availability and tips & techniques to make your digital mode

operating experience enjoyable. This printed manual will be updated frequently with

corrections and new capabilities presented in the current software, so be sure to always

check out the website.

Another great source of information and camaraderie with fellow owners of the digital

modem is the NUE-PSK email reflector on Yahoo Groups. If not already signed up for

this great communication forum, go to

group called NUE-PSK. You can view all the messages posted there, and if you join (for

free!), you will be able to post questions and comments yourself, as well as access the

files in the group.

NUE-PSK Digital Modem Operator's Manual, ver 1.20

www.nue-psk.com

www.yahoogroups.com

for the latest

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