Shop OBEX P1 Docs P2 Docs Learn Events
Propeller Ham Radio — Parallax Forums

Propeller Ham Radio

PashaPasha Posts: 56
edited 2008-09-23 18:28 in Propeller 1
I am kinda new to the propeller chip and everything. I bought it to make a robot with, but in the process of learning spin, i found out that it has some great features that could be used for Ham Radio. I succesfully built an AM transmiter with it, as well as a cw keyer that works in the HF range.

Comments

  • PashaPasha Posts: 56
    edited 2008-09-23 14:06
    Does anyone have any ideas about how to do ssb digitally? there are supposed to be ways, but i don't·really get how to do it.·also if anyone would be interested in working on this kind of project and sharing code i would be interested. this could potentially be a very cheap Ham Radio.
  • LeonLeon Posts: 7,620
    edited 2008-09-23 16:28
    Have a look at software-defined radios. The Propeller hasn't got enough performance, though.

    Leon

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Amateur radio callsign: G1HSM
    Suzuki SV1000S motorcycle
  • PashaPasha Posts: 56
    edited 2008-09-23 17:04
    like i said i am new to this. would you mind explaining why.
  • Mike GreenMike Green Posts: 23,101
    edited 2008-09-23 17:15
    There's a thread recently on using a Propeller for an AM receiver. The same techniques could be used for SSB.

    The Propeller is not fast enough to do this over a wide band of frequencies. You could use the Propeller at IF frequencies.
    It could also be used to generate SSB, again at IF frequencies. It would be a demonstration of concept rather than a
    practical device, mostly because of noise.
  • PashaPasha Posts: 56
    edited 2008-09-23 17:21
    could you combine the Propeller with some other signal processor to get rid of this problem?
  • PashaPasha Posts: 56
    edited 2008-09-23 17:27
    hey mike i can't find that thread would you mind telling me where it is?
  • Mike GreenMike Green Posts: 23,101
    edited 2008-09-23 17:28
    NO

    You can only address noise through careful design of software and hardware. This is not received noise from outside the system.
    We're talking about internally generated noise within the receiver / transceiver. Adding a signal processor just adds more noise
    and losses.

    I don't have a link to the thread ... Just go through the threads for the last week or so. It's a bit of work, but you also might
    find out some other interesting things.
  • PashaPasha Posts: 56
    edited 2008-09-23 17:42
    Thanks very much
  • Mike CookMike Cook Posts: 829
    edited 2008-09-23 17:45
    http://forums.parallax.com/showthread.php?p=743002

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Mike
  • LeonLeon Posts: 7,620
    edited 2008-09-23 18:15
    Most simple amateur SDRs are based on a quadrature sampling detector built from high-speed bus switches like the FST3125 and a suitable local oscillator, followed by a low-noise pre-amp, with a PC and sound card doing the signal processing. The Propeller couldn't even replace the oscillator - it has too much jitter and phase noise - and hasn't anywhere enough performance for the DSP functions.

    Leon

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Amateur radio callsign: G1HSM
    Suzuki SV1000S motorcycle
  • PashaPasha Posts: 56
    edited 2008-09-23 18:28
    Thanks mike that is exactly what i was looking for.
Sign In or Register to comment.