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12 votes
Accepted

How does signal strength relate to bandwidth?

It depends on what you mean by "stronger". Ignoring actual limitations of your hardware and just considering the theory of communications, if you have 25 W of transmit power, then you can spread that ...
Kevin Reid AG6YO's user avatar
  • 24.7k
8 votes

Can an SSB transmitter be used to transmit PSK?

The short answer is "absolutely!". :-) I started out using Digipan on Windows, but other software such as Fldigi has been released since then. Audio from the sound card to the mic input --and from ...
Mike Waters's user avatar
  • 8,071
4 votes
Accepted

Filtering for PSK31 demodulation

So, to maximize SNR you'd use a matched filter (which is the conjugate complex of the time-reversed TX pulse shaping filter), and assuming the pulse shaper has been reasonably chosen, that'd also a ...
Marcus Müller's user avatar
4 votes
Accepted

Transmission distance of PSK31 on various HF band

This question is far too general to merit definite answers. There are free propagation prediction tools that can help you understand the possibilities. I recommend PropView, a component of the DX Lab ...
Brian K1LI's user avatar
  • 7,878
4 votes
Accepted

What is "allied mode" with regards to PSK31?

That was just added by someone who's primary language probably isn't English. What they meant to say is "QPSK31, a mode that is related to PSK31, uses..." Other than that, the claim "it ...
Marcus Müller's user avatar
3 votes

How does signal strength relate to bandwidth?

If by "strength" you mean "subjective volume as determined by a human operator", then reducing the bandwidth of the transmission while keeping the transmitter power constant does indeed produce a "...
Phil Frost - W8II's user avatar
2 votes

Transmission distance of PSK31 on various HF band

Transmission distance isn't limited by mode. It is limited by frequency, and sometimes power. Even given frequency and power, you can only give broad generalities on distance, because band ...
user10489's user avatar
  • 6,495
2 votes

Can an SSB transmitter be used to transmit PSK?

Yes, that's mathematically and technologically possible. Because Mike already said the latter, let me elaborate on the math side: Remember that SSB is really just AM, with one half of the transmit ...
Marcus Müller's user avatar
2 votes

Filtering for PSK31 demodulation

I was not able to find very much history on these filters, but I did track down two sets of coefficients from popular implementations, and for your pleasure, I'll present them here. Transmit ...
Phil Frost - W8II's user avatar
2 votes

What is "allied mode" with regards to PSK31?

In this case, "allied mode" can be replace with "associated mode" or "kindred mode." The phrase indicates that there is a relationship between the two modes, BPSK and ...
Brian K1LI's user avatar
  • 7,878
1 vote

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

Yes, it's possible. The physics and the math don't care what the legal assignment of some RF band is - so you can do any working modulation method on a ham band. Nothing is special about ham bands.
Marcus Müller's user avatar
1 vote

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

Your reasoning is correct: in principle, given identical bit rate and signal power, the BER for BPSK and QPSK are identical. The Wikipedia article on PSK puts it nicely. The author there points out ...
Rodney Price's user avatar
1 vote

How long are the PSK31 preamble and postamble?

I am sorry that I cannot provide a concrete reference but I seem to recall that it is around 80 based on some receiving software requirements.
Glenn W9IQ's user avatar
  • 18.6k

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