Skip to main content
5 votes
Accepted

Receiving the ISS SSTV: dipole antenna configuration and orientation

reports it as "U: linear, V: linear" Satellites which transmit and receive at the same time frequently do one on VHF (2m) and the other on UHF (70cm), and they frequently have separate ...
hobbs - KC2G's user avatar
  • 12.5k
4 votes
Accepted

Video transmission between ATV and SSTV

So, a teaser first: With GNU Radio, you can transmit various DVB standards. Here's Alexandru Csete demoing his DVB-S2 transmission: As you can see from the FFT Plot generated by the flow graph in ...
Marcus Müller's user avatar
4 votes
Accepted

How can I decode SSTV with only macOS software?

MultiScan 3B works fine in terms of decoding. This being said I had some issues making it work with my external sound card for transmitting SSTV. For some reason transmitted images turned out to be ...
Aleksander Alekseev - R2AUK's user avatar
4 votes
Accepted

Transmitting Video Underwater

Here is some useful scholarly information about the signal attenuation (in dB) of EM waves through freshwater at various frequencies and depths. You will find a formula that you can use. You will also ...
Mike Waters's user avatar
  • 8,071
3 votes

Transmitting Video Underwater

SSTV could be an interesting answer here. Bandwidth requirement is about 30 KHz to reach your goal of 1 frame per second AND it's proven tech on HF bands... though you'll need to multiplex the video ...
webmarc's user avatar
  • 4,279
2 votes

crt TV emissions

The TV is likely not emitting any information, but rather just noise. A TV from the 80s would have been a CRT set. These work by sweeping a beam of electrons through a raster scan. The aiming of that ...
Phil Frost - W8II's user avatar
2 votes

Transmitting Video Underwater

Any antenna under water is creates a far more difficult problem than that of the main focus of the school project. I would put a WiFi transmitter (ESP32, et.al., inexpensive loss if drowned) on a ...
hotpaw2's user avatar
  • 13.5k
2 votes
Accepted

SSTV decoder for already-recorded files?

I don't know of digital-mode software that has the capability to open a file, but that doesn't mean that it doesn't exist. However, there is a handy work-around to your problem: a virtual audio cable....
rclocher3's user avatar
  • 9,242
2 votes

Receiving the ISS SSTV: dipole antenna configuration and orientation

The ionosphere conversion to circular is not particularly good - e.g. see cv.nrao.edu/~demerson/ionosphere/ionopol.html. This means that the circular polarization is very variable (ratio of major:...
jp314's user avatar
  • 141
1 vote

SSTV on repeaters?

Just adding to the above answer: If you are going to transmit SSTV on a repeater that is also used for voice, you should try to be a courteous as possible: Make yourself aware of any popular nets ...
Robert Quattlebaum's user avatar
1 vote

QSSTV on Linux Mint

I once successfully used QSSTV on Linux Mint for displaying digital pictures. However, at some point after upgrading LM it ceased working correctly. It would just not lock onto a signal anymore. But I ...
Mike Waters's user avatar
  • 8,071
1 vote

How can I decode SSTV with only macOS software?

I've been able to make Multiscan 3B SSTV decoder work on my older iMac with High Sierra (together with RTL-SDR USB dongle, FM decoded using CubicSDR and audio routed using Audio Hijack). MultiScan 3B ...
igraczech's user avatar
  • 111
1 vote

Yaesu FT60 to Android Phone Cable

The wiring would be identical to a cable for APRS purposes (software TNC on the phone). I haven't found anyone doing this but I don't see why it wouldn't be possible. You want an interface circuit to ...
Kevin Reid AG6YO's user avatar
  • 24.7k
1 vote

DRM/Easypal/Digital SSTV programatic generation resources?

By programatically you mean through command line and/or scriptable ? I was looking for a linux app for DRM digital SSTV compatible with EasyPal and found TXRXAMADRM: http://pa0mbo.nl/ties/public_html/...
Martin Herren HB9FXX-KJ4WOH's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible