| |
DC7OS > POCKETPC 14.01.08 16:52l 89 Lines 4212 Bytes #999 (10) @ DL
BID : E1IDC7OS_0DZ
Read: OE7HNT DF5GI GUEST DL1DVE DD3IA DL5KV
Subj: (01/01) PocketDigi_1_0_11.inf
Path: DB0FHN<DB0FOR<DF0ANN<DB0ZDF<DB0LJ<DB0RES<DB0OSN<DB0PDF<DB0WHV<DB0NDR<
DB0UHI<DB0FC
Sent: 080114/1548z @:DB0FC.#NDS.DEU.EU [JO52GG OP: DF2AU] DP6.00 $:E1IDC7OS_0DZ
X-Info: User S&F received from DC7OS at DB0FC
From: DC7OS @ DC7OS.DB0FD.#NDS.DEU.EU (Karsten)
To: POCKETPC @ DL
X-Info: Sent with login password
PocketDigi PSK31 Mode
Using your PocketPC PDA to receive PSK31 with PocketDigi
1. Launch PocketDigi.
2. Select Mode from the Channels menu. Then choose PSK31.
3. Position the PDA near the radio speaker such that the PocketPC's built-in
microphone will pickup audio from the radio. Make sure that the audio
level is plenty strong. The waterfall audio display at the top should
show the incoming signals.
4. Next, select an incoming audio stream by clicking on it in the waterfall
display. It should look something like this:
At this point, the PDA should be receiving PSK31 text (or at least
gibberish) in the output box. If it's mostly garbled text, you'll need to
tweak. The first thing to try, is to make sure that your cursor (arrow) is
exactly centered on the signal.
Other options:
FFT selection. FFT, or Fast Fourier Transforms, are computer algorithms
which are used to convert the signals into text. Choosing a different FFT
setting will rescale the PocketDigi waterfall graph at the top. This might
help you center your cursor on the PSK signal.
AFC or Automatic Frequency Control will center the cursor on the strongest
signal, automatically.
Using your PocketPC PDA to send PSK31 with PocketDigi
To send PSK31 text, choose Send from the Tools menu. You should hear PSK31
audio coming from the PocketPC speaker or headphone jack. Begin typing.
When finished, choose Tools -> TX stop to end your transmission. The
current version does not offer macros.
If you would like to have a "brag file" (canned text to be sent all at
once), you can simply store that in a text file on your PDA.
PocketDigi CW Mode
With PocketDigi, you can decode Morse Code using your PocketPC PDA. No, it
won't flawlessly copy RST=339 60 wpm left-footed CW with heavy QSB sent
with the syncopation of jazz drummer. But for those who are learning Morse
Code or who have some hearing loss, PocketDigi offers a fun way to get in
the action on the ham radio bands.
Using your PocketPC PDA to receive CW (Morse Code) with PocketDigi
1. Launch PocketDigi.
2. Select Mode from the Channels menu. Then choose CW.
3. Position the PDA near the radio speaker such that the PocketPC's built-in
microphone will pickup audio from the radio. Make sure that the audio
level is plenty strong. The waterfall audio display at the top should
show the incoming signals.
4. Select the Max RX speed. This is the an approximation of how fast you
think the CW is being sent at its fastest speed. By setting this value,
you are giving the decoding algorithm a clue about the incoming audio
(a "dah" at 60 wpm CW might be shorter than a "dit" at 5 wpm).
5. Set the filter. To do this, choose Filter BW from the Channels menu and
select a bandwidth. This step will help the DSP software within
PocketDigi narrow in on a particular Morse Code signal. If you have
multiple hardware or software filters in your transceiver, you'll know
the impact of this step. Setting a filter too narrow on a fast CW signal
causes problems. Setting the filter too wide under noisy conditions (QRM)
is also a problem for the decoder.
Interpreting the results - 20 wpm CW
Here is some Morse Code that has been "decoded". To run this experiment, I
played the audio output (using Morse Runner) from my laptop PC into my iPAQ
2215 PocketPC. In the receive box, you'll see some text that might look like
gibberish. If you sort of squint, you can see the PDA decoding my CQ string (CQ
TEST DE N0HR TEST). In one QSO, I gave WB2JEP a 5NN TT1 (contesters will
recognize this as a CW RST of 599 and a report of 001). Then you see some
junk (noise that the PocketDigi program attempted to decode). Next there is
another CQ and a QSO with N6PZ (I sent a 5NNTT2).
The moral of the story is that yes, it can decode CW, but you'll probably only
want to use it as a backup to the decoder between your ears.
Read previous mail | Read next mail
| |
