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> Miller got his ham radio license in 1943, founded his own electronics company called Wyman Research, and helped develop slow-scan TV, a technology that transm

> Miller got his ham radio license in 1943, founded his own electronics company called Wyman Research, and helped develop slow-scan TV, a technology that transmits still images across high-frequency radio bands. Don't they mean VHF, and UHF? I haven't yet worked HF, but is SSTV used on HF? Also, wow, this guy helped create SSTV.

mlyle 5y ago
Yes, SSTV is mostly used on HF, with a little bit of use on VHF/UHF (mostly from e.g. satellites and the ISS as a curiosity/postcards, though there are some local SSTV nets). On 20m, all kinds of random pictures go by: pictures of ham shacks, scantily clad women, fast cars. http://www.wb9kmw.com/WB9KMW/live_SSTV.html http://www.wb9kmw.com/WB9KMW/live_SSTV.html Fast scan TV (aka normal analog TV, DVB, etc) is used on UHF and up.
CamperBob2 5y ago
Yes, SSTV is so slow that the bandwidth requirements satisfy the regs for transmission on HF.
- GoodbyeMrChips 5y ago
  > bandwidth requirements satisfy the regs Please note that only the USA (afaik) imposes an arbitrary and restrictive 300 bd limit on HF digital modes. Here, amateurs are free to experiment with as much bandwidth and as high a baud rate as the physics will allow, provided we keep within legally allocated spectrum.
  - dmd 5y ago
    Where's "here"?
    - CamperBob2 5y ago
      Sounds like the Woodpecker site at Chernobyl. Hey, that was "legally allocated spectrum" too, right? To be fair, occupied bandwidth limits that were designed for 1920s-era modes don't make much sense with modern spread-spectrum technology. I don't care if an interferer takes up the whole HF spectrum, as long as their chip rate is too fast to make it through my < 3 kHz IF. Those ancient regulations have done a lot to keep Amateur Radio in the dark ages, as well as radio communications in general.
  - mlyle 5y ago
    AKA you can transmit wide signals and take up the whole band :P The 300bps limit doesn't make sense anymore, but an occupied bandwidth limit sure does...
jacquesm 5y ago
Hence the 'slow', it's more like a fax than a TV really.
op00to 5y ago
SSTV is mostly used in HF these days. Mostly to send bikini pictures. I enjoy replying with cat pictures to the old dirty hams. :)

mlyle 5y ago

Yes, SSTV is mostly used on HF, with a little bit of use on VHF/UHF (mostly from e.g. satellites and the ISS as a curiosity/postcards, though there are some local SSTV nets). On 20m, all kinds of random pictures go by: pictures of ham shacks, scantily clad women, fast cars. http://www.wb9kmw.com/WB9KMW/live_SSTV.html http://www.wb9kmw.com/WB9KMW/live_SSTV.html Fast scan TV (aka normal analog TV, DVB, etc) is used on UHF and up.

CamperBob2 5y ago

Yes, SSTV is so slow that the bandwidth requirements satisfy the regs for transmission on HF.

GoodbyeMrChips 5y ago
> bandwidth requirements satisfy the regs Please note that only the USA (afaik) imposes an arbitrary and restrictive 300 bd limit on HF digital modes. Here, amateurs are free to experiment with as much bandwidth and as high a baud rate as the physics will allow, provided we keep within legally allocated spectrum.
- dmd 5y ago
  Where's "here"?
  - CamperBob2 5y ago
    Sounds like the Woodpecker site at Chernobyl. Hey, that was "legally allocated spectrum" too, right? To be fair, occupied bandwidth limits that were designed for 1920s-era modes don't make much sense with modern spread-spectrum technology. I don't care if an interferer takes up the whole HF spectrum, as long as their chip rate is too fast to make it through my < 3 kHz IF. Those ancient regulations have done a lot to keep Amateur Radio in the dark ages, as well as radio communications in general.
- mlyle 5y ago
  AKA you can transmit wide signals and take up the whole band :P The 300bps limit doesn't make sense anymore, but an occupied bandwidth limit sure does...

jacquesm 5y ago

Hence the 'slow', it's more like a fax than a TV really.

op00to 5y ago

SSTV is mostly used in HF these days. Mostly to send bikini pictures. I enjoy replying with cat pictures to the old dirty hams. :)