Questions tagged [psk31]

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8 votes
2 answers
3k views

How does signal strength relate to bandwidth?

Let's say I have a 25 W transmitter. First I transmit some SSB signal with 2500 Hz bandwidth (no audio compressor is used, etc...). Then I transmit a BPSK31 signal with at most 100 Hz bandwidth using ...
Aleksander Alekseev - R2AUK's user avatar
6 votes
2 answers
879 views

Filtering for PSK31 demodulation

What's the ideal filter for PSK31 demodulation? That is, something that minimizes ISI, while having a narrow bandwidth to reject adjacent channels, while being reasonably matched? Most PSK modes use ...
Phil Frost - W8II's user avatar
4 votes
1 answer
166 views

Is the error rate for QPSK31 in a white noise channel worse than BPSK31?

I've read in a couple sources that in a channel consisting of only additive white Gaussian noise (AWGN), at low SNR, QPSK31 is actually worse than BPSK31. http://www.arrl.org/psk31-spec, probably ...
Phil Frost - W8II's user avatar
2 votes
2 answers
331 views

Can an SSB transmitter be used to transmit PSK?

Can a generic/typical analog SSB transmitter be used to send PSK modulated digital signals? If so, how does that work? How is a computer or DSP interfaced with an SSB transmitter? Line level ...
hotpaw2's user avatar
  • 13.3k
2 votes
2 answers
174 views

How long are the PSK31 preamble and postamble?

The PSK31 specification by ARRL specifies: There is a preamble at the start of each transmission and a postamble at the end. The preamble is an idle signal of continuous zeroes, corresponding to ...
Phil Frost - W8II's user avatar
0 votes
2 answers
80 views

What is "allied mode" with regards to PSK31?

Wikipedia says: Colloquial usage of the term 'PSK31' in amateur radio usually implies the use of the most commonly used variant of PSK31: binary phase shift keying (BPSK). BPSK uses no error control, ...
Xunie's user avatar
  • 214
0 votes
1 answer
97 views

Transfer digital data over ham radio frequencies using QPSK modulation SSB-QPSK transmitter

If I use QPSK modulator/demodulator is it possible to transfer digital data over ham radio frequencies. SSB-QPSK transmitter
Vinayak's user avatar
  • 109
-4 votes
2 answers
185 views

Transmission distance of PSK31 on various HF band [closed]

Would appreciate insight on efficiency of PSK31 on various HF band. Would 300 to 1000 km generally achievable if suitable band are chosen, according to day night and sun spot cycle using low power ...
EEd's user avatar
  • 562